OSC RMX 850 Technical Service Manual

RMX™ Series L L L L L RMX 850 L L L L L RMX 1450 L L L L L RMX 2450 *TD-000078-00* TD-000078-00

1 QSC Audio Products, Inc. Technical Services Group Phone: 1-800 QSC AUDIO (1-800-772-2834) USA only +1 (714) 957-7150 Fax: +1 (714) 754-6173 Postal: 1665 MacArthur Blvd. Costa Mesa, California 92626 USA E-mail: [email protected] Web: http://www.qscaudio.com (product information and support) http://www.qscstore.com (parts and accessory sales) RMX 850 RMX 1450 RMX 2450 RMX Series Technical Service Manual Copyright 2001 QSC Audio Products, Inc. All rights reserved.

RMX 850 RMX 1450 RMX 2450 OUTPUT POWER in watts FTC: 20 Hz–20 kHz @ 0.1% THD, both channels driven 8Ω per channel 185 260 450 4Ω per channel 280 400 650 EIA: 1 kHz @ 0.1% THD, both channels driven 8Ω per channel 200 280 500 4Ω per channel 300 450 750 1 kHz @ 1% THD, typical, both channels driven 2Ω per channel 430 700 1200 Bridge Mono: 8Ω, 20 Hz–20 kHz, 0.1% THD 530 800 1300 8Ω, 1 kHz, 0.1% THD 600 900 1500 4Ω, 1 kHz, 1% THD, typical 830 1400 2400 DYNAMIC HEADROOM 2 dB @ 4Ω DISTORTION SMPTE-IM < 0.01% < 0.01% < 0.02% FREQUENCY RESPONSE 20 Hz–20 kHz, +0/-1 dB (at 10 dB below rated output power) -3 dB points: 5 Hz and 50 kHz DAMPING FACTOR > 300 @ 8Ω NOISE (unweighted 20 Hz to 20 kHz, below rated output) 100 dB 100 dB 100 dB VOLTAGE GAIN 31.6× (30 dB) 40× (32 dB) 50× (34 dB) INPUT SENSITIVITY, V RMS full rated power @ 8Ω 1.15v (+3.4 dBu) 1.15v (+3.4 dBu) 1.23v (+4.0 dBu) INPUT IMPEDANCE 10 KΩ unbalanced 20 KΩ balanced CONTROLS Front: AC switch, Ch. 1 and Ch. 2 gain Rear: 10-position DIP switch INDICATORS POWER: Green LED CLIP: Red LED, 1 per channel SIGNAL: Yellow LED, 1 per channel CONNECTORS Input: Active balanced; XLR and ¼" (6.3 mm) TRS, tip and pin 2 positive, and barrier strip Output: “Touch-Proof” binding posts and Neutrik Speakon™ COOLING Continuously variable speed fan, back-to-front air flow AMPLIFIER PROTECTION Full short circuit, open circuit, thermal, ultrasonic, and RF protection Stable into reactive or mismatched loads LOAD PROTECTION Turn-on/turn-off muting, AC coupling, triac crowbar (on each channel) OUTPUT CIRCUIT TYPE AB AB H AB: Class AB complementary linear output H: Class AB complementary linear output with Class H 2-step high efficiency circuit DIMENSIONS 19.0" (48.3 cm) wide, 3.5" (8.9 cm) tall (2 rack spaces) 15.9" (40 cm) deep (rack mounting to rear support ears) WEIGHT Shipping: 41 lb. (18.6 kg) 46 lb. (20.9 kg) 50.5 lb. (23 kg) Net: 35 lb. (15.9 kg) 40 lb. (18.2 kg) 44.5 lb. (20.2 kg) POWER REQUIREMENTS Available for 120 or 220–240 VAC, 50/60 Hz POWER CONSUMPTION @ 120 VAC (both channels driven) Multiply currents by 0.5 for 230V units US patents pending SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE la cip y T 1 llu F 2 x a M 3 eldI A 5.0 8ΩΩΩΩΩ A 3 A 1.4 A 4.7 4ΩΩΩΩΩ A 5.4 A 6.6 A 5.1 1 2ΩΩΩΩΩ A 5.6 * A 5.9 * A 7 1 la cip y T 1 llu F 2 x a M 3 eldI A 5.0 8ΩΩΩΩΩ A 7.3 A 4.5 A 0 1 4ΩΩΩΩΩ A 6 A 6.9 A 6 1 2ΩΩΩΩΩ A 3.9 * A 7.4 1 * A 5 2 la cip y T 1 llu F 2 x a M 3 eldI A 6.0 8ΩΩΩΩΩ A 4 A 7.9 A 4.6 1 4ΩΩΩΩΩ A 3.6 A 6.5 1 A 7 2 2ΩΩΩΩΩ A 2.9 * A 3 2 * A 1 4 RMX Series Performance Specifications

3 Table of Contents RMX Series Performance Specifications ........................................................................................................................................ 4 1. Introduction ........................................................................................................................................................................................ 6 1.1 Service bulletins ................................................................................................................................................................................ 6 1.2 The well-equipped service bench ..................................................................................................................................................... 6 1.3 Working with surface-mount components ....................................................................................................................................... 6 1.4 Series description ............................................................................................................................................................................. 8 1.5 Technical descriptions and theory of operation................................................................................................................................ 8 2. Component identification and pinout ........................................................................................................................................... 10 3. Troubleshooting: Symptoms, causes, & remedies ..................................................................................................................... 12 3.1 Excessive current draw ..................................................................................................................................................................... 12 3.2 Protection, muting, and turn-on/turn-off delay problems ................................................................................................................ 12 3.3 Faults with signal present ................................................................................................................................................................. 13 3.4 Instability ........................................................................................................................................................................................... 13 3.5 Power supply & rail balancing problems .......................................................................................................................................... 14 4. RMX calibration procedures .......................................................................................................................................................... 14 4.1 Setting bias ....................................................................................................................................................................................... 14 4.2 Setting positive and negative current limits..................................................................................................................................... 15 5. Servicing RMX amplifiers ............................................................................................................................................................... 16 5.1 Mechanical disassembly and re-assembly ....................................................................................................................................... 16 6. Replacement parts ............................................................................................................................................................................ 17 6.1 RMX 850 Replacement Parts ............................................................................................................................................................ 17 6.2 RMX 1450 Replacement Parts .......................................................................................................................................................... 20 6.3 RMX 2450 Replacement Parts .......................................................................................................................................................... 23 7. Schematics and diagrams ............................................................................................................................................................... 27 7.1 RMX Assembly/Disassembly Diagram 1 of 2 (All models)............................................................................................................... 27 7.2 RMX Assembly/Disassembly Diagram 2 of 2 (All models)............................................................................................................... 28 7.3 RMX 850 Schematic Diagram 1 of 3 Channel 1 ............................................................................................................................... 29 7.4 RMX 850 Schematic Diagram 2 of 3 Channel 2 ............................................................................................................................... 30 7.5 RMX 850 Schematic Diagram 3 of 3 Power Supply ......................................................................................................................... 31 7.6 RMX 1450 Schematic Diagram 1 of 3 Channel 1 ............................................................................................................................. 32 7.7 RMX 1450 Schematic Diagram 2 of 3 Channel 2 ............................................................................................................................. 33 7.8 RMX 1450 Schematic Diagram 3 of 3 Power Supply ....................................................................................................................... 34 7.9 RMX 2450 Schematic Diagram 1 of 3 Channel 1 ............................................................................................................................. 35 7.10 RMX 2450 Schematic Diagram 2 of 3 Channel 2 ........................................................................................................................... 36 7.11 RMX 2450 Schematic Diagram 3 of 3 Power Supply ..................................................................................................................... 37 7.12 RMX 850 Chassis Wiring Diagram ................................................................................................................................................. 38 7.13 RMX 1450 Chassis Wiring Diagram ............................................................................................................................................... 39 7.14 RMX 2450 Chassis Wiring Diagram ............................................................................................................................................... 40

Solder braid 1. Introduction 1.1 Service bulletins Contact QSC Technical Services to make sure you have the most up-to-date service bulletins for RMX Series amplifiers. Service bulletins may be distributed in hard copy, via fax, and electronically (Adobe Acrobat PDF) via CD-ROMs, FTP from the QSC web site (www.qscaudio.com), and e-mail. These service bulletins had been issued at the time this manual was printed: RMX0001, “Q205 Lead Stress” (RMX 2450 only); RMX0002, “RMX Turn-on Delay” (all RMX models); RMX0003, “RMX 2450 Turn-off Mute” (RMX 2450); RMX0004, “RMX 2450 AC Wire Routing” (RMX 2450); RMX0005, “RMX 2450 AC Wire Replacement” (RMX 2450); and RMX0006, “RMX 2450 IRFZ44N Field Effect Transistors (RMX 2450). 1.3 Working with surface-mount components RMX amplifiers, like many modern electronic products, use surface-mount technology (SMT) components where appropriate in order to make high-density circuitry that is reliable and economical to manufacture. SMT components in the RMX amps are used in the small-signal and control circuits, so they do not handle significant amounts of power; therefore, they are subject to very little stress and should seldom fail. Sometimes they do fail, or they require replacement for a performance upgrade or modification. Thus, it is important to know how to work with SMT components. Specialized tools and equipment exist for soldering, unsoldering, and removing SMT components quickly and efficiently, but they are often expensive. Most SMT repairs, though, can be handled reasonably well with common tools and equipment, such as tweezers, solder braid, and fine-tip soldering irons. The original factory components are tacked to the board with a spot of glue, so you might have to apply some force to break the adhesive. Two-terminal components (resistors, capacitors, diodes, etc.) Removal 1 Use two soldering irons, preferably about 25 to 40 watts, with fine tips. 2 With a soldering iron in each hand, hold one tip on the solder at one end of the component and the other tip on the other end (Figure 1.1). 3 Once the solder melts on both ends, grip the component between the two tips and lift it from the circuit board. 4 Use solder braid and a soldering iron to remove the solder from the two pads (Figure 1.2). 1.2 The well-equipped service bench To properly service RMX amplifiers, a technician needs the right tools. The technician’s service bench should have the following equipment: • Digital multimeter with RMS AC voltage and current • Digital clamp-on ammeter • Dual-trace oscilloscope • Audio distortion analyzer • Non-inductive load resistors, configurable as 8 ohms (min. 500 watts capacity), as 4 ohms (min. 750 watts capacity), and 2 ohms (min. 1200 watts capacity) • Variable AC voltage source, such as a Variac or Powerstat variable transformer, with a rated current capacity of up to 25A (for 120V models) or 12A (for 230V models) • Low-distortion audio sine wave generator • Philips and flat screwdrivers • Soldering iron with a fine tip (25–60W recommended) • Rosin-core solder (60/40 or 63/37) • Long-nose pliers • Diagonal cutters • Wire strippers Automated test equipment, such as an Audio Precision workstation, is very useful for servicing RMX amplifiers. Contact QSC Technical Services to obtain applicable AP test files. Figure 1.1. Figure 1.2.

5 Solder Solder Tweezers Solder Insertion 1 With a soldering iron and 60/40 or 63/37 eutectic-type solder, melt just enough solder onto one pad to create a small mound (Figure 1.3). 2 Grasp the component in the middle with tweezers. Melt the small mound of solder with the iron and place the component across the two pads (in the correct orientation, if the component is sensitive to direction) and press it flat against the circuit board, with one end of the component immersed in the melted solder (Figure 1.4). 3 Hold the component in place and take the soldering iron away. Let the solder harden to tack the component in place. 4 Fully solder the other end of the component to its pad. Let the solder harden (Figure 1.5). 5 Fully solder the tacked end of the component to its pad (Figure 1.6). Three-terminal components (transistors, etc.) Removal 1 With a soldering iron and solder braid, remove as much solder as possible from the middle terminal of the component. 2 With a soldering iron in each hand, hold one tip on the solder at the terminal at one end of the compo- nent and the other tip on the terminal at the other end. 3 When the solder on both ends melts, grip the component between the two tips and lift it from the circuit board. You might need to quickly touch the pad on the middle terminal with a soldering iron to melt any remaining solder that might be holding the component down. 4 Use solder braid and a soldering iron to remove the solder from the three pads. Insertion 1 With a soldering iron and 60/40 or 63/37 eutectic-type solder, melt just enough solder onto one pad to create a small mound of solder. 2 Grasp the component with tweezers. Melt the small mound of solder with the iron and place the component in the correct orientation across the three pads and press it flat against the circuit board, with one terminal of the component pressed into the melted solder. 3 Hold the component in place and take the soldering iron away. Let the solder harden to tack the component in place. 4 Fully solder the other terminals of the component to their pads. Let the solder harden. 5 Fully solder the tacked terminal of the component to its pad. Multi-pin components (ICs, etc.) Removal Removing a multi-pin SMT component is a delicate procedure. Ideally, you should use a soldering iron with an attachment that allows you to heat all the pins simultaneously. If such a soldering device is not available, use this procedure: 1 Use a soldering iron and solder braid to remove as much solder as possible from the pins of the component. 2 With fine tweezers, carefully try to lift each pin to see if it’s free. If it’s not, touch it with the tip of the soldering iron and if necessary, use the solder braid to remove the remaining solder. 3 Repeat the process until all the pins are free and you can remove the component. Insertion 1 With a soldering iron and 60/40 or 63/37 eutectic-type solder, melt just enough solder onto one pad to create a small mound of solder. It is usually easiest to use a pad that corresponds to one of the end or corner pins of the component. 2 Grasp the component with tweezers. Melt the small mound of solder with the iron and place the component in the correct orientation upon its pads and gently press it flat against the circuit board, with the appropriate terminal of the component pressed into the melted solder. 3 Hold the component in place and take the soldering iron away. Let the solder harden to tack the component in place. 4 Fully solder the other terminals of the component to their pads. Let the solder harden. 5 Fully solder the tacked terminal of the component to its pad. Figure 1.3. Figure 1.4. Figure 1.5. Figure 1.6.

1.4 Series description QSC’s RMX Series amplifiers are entry-level professional audio products, designed for good, basic performance and reliability at low price. The series comprises three models: the RMX 850, RMX 1450, and RMX 2450. Each one has two audio channels and is two rack spaces tall. See page 2 for complete specifications. The RMX 850 and RMX 1450 have single-sided printed circuit boards. The RMX 2450 uses double-sided boards. 1.5 Technical descriptions and theory of operation Note: Some of these descriptions concern circuitry that is duplicated in the amplifier’s two channels. For the sake of simplicity, the descriptions are of Channel 1 only. Components in Channel 1 have a 3-digit designation with “1” as the first digit; their equivalents in Channel 2 have a “2” as the first digit, followed by the same two numerals. For example, R122 and R222 have identical functions in their respective channels. Power supplies Unlike other recent QSC amplifiers, the RMX line uses strictly conventional power supplies, with large transformers that operate at the 50 or 60 Hz frequency of the AC line. The electrical current in the secondary circuitry is converted to DC through a full-wave bridge rectifier. The resulting 100 or 120 Hz ripple is filtered out by large capacitors that also serve as current reservoirs for short-term, transient demands. The supply provides a bipolar set of supply rails for each channel, with equal quiescent positive and negative voltages, as shown in Figure 1.7. Note that unlike many bipolar supplies for complementary transistor arrangements, the secondary windings are not connected to ground at the center. This is because the output transistors are directly mounted to the heat sink, metal-to-metal, to maximize heat transfer; this grounds the collectors, requiring somewhat different output and power supply arrangements. The grounded-collector concept is described later in this chapter. In the RMX 2450, the secondaries are tapped to provide an intermediate set of bipolar rails for the Class H output circuitry. Figure 1.8 shows one channel. Class H operation is described later in this chapter. The 24-volt cooling fan is driven by a separate DC supply that is powered by a +Vcc -Vcc +Vcc -Vcc Channel 1 Channel 2 +110V -110V +55V -55V Channel 1 Ch. 1 Center Tap To Channel 2 Center Tap 12 5W ×2 Ω 0.047 µF 20-volt tap on the transformer primary. To minimize fan noise, the fan speed is controlled by varying its actual DC voltage in response to the amplifier’s heat sink temperatures. An optocoupler isolates the fan control circuitry from the thermal sensors. Audio circuitry The audio inputs are balanced to offer a reasonably high amount of common-mode noise rejection. The input balancing is done using a single op amp (one half of an NE5532 dual op amp) arranged as a differential amplifier. The degree of common-mode rejection is dependent on a close match between the input resistors (R100 and R101 in Figure 1.9) and between the feedback resistor and the shunt resistor (R105 and R106). The circuitry uses 1% precision resistors to ensure at least 40 dB of common-mode rejection. The feedback and shunt capacitors, C101 and C103, add a first-order high-frequency roll-off, down 3 dB at 88.4 kHz (over two octaves above the high end of the audio spectrum). This makes the amplifier less susceptible to RF interference, high-frequency oscillations, etc. Also in this stage, the feedback loop contains one half of a 13600 dual operational transconductance amplifier (Figure 1.10). The OTA is part of the clip limiter circuitry; when the clip limiter is activated, a control voltage increases the transconductance of the OTA, which essen- tially decreases the impedance of the feedback loop and reduces the gain of the stage in order to reduce the amount of clipping. The gain control uses a linear potentiometer, but the impedances loading the wiper to ground make the pot approximate an audio taper over most of its rotation. After the wiper, RC networks roll off the low end, if the LF filter is set for that channel, at either 30 or 50 Hz, depending on the DIP switch setting on the rear panel. The next active device is another 5532 op amp, U101:2. Its output drives the driver transistors, which in turn drive the output transistors. The output section has a Class AB+B configuration; the drivers (a complementary pair, Q105 and Q106, comprising an NPN MJE15032 and a PNP MJE 15033) are class AB. A series network of two diodes and a 100-ohm trimpot provide the small amount of forward bias on 10K LINEAR 3B RIGHT ANGLE POT R106 10.0K ^R_0805 R101 10.0K ^R_0805 R100 10.0K ^R_0805 R105 10.0K ^R_0805 CW CCW W R112 10K A1 R102 1K ^R_0805 +IN_A -IN_A C101 180p-5% ^C_0805 C103 180p-5% C106 10-50NP 3 + 2 - 1 NE5532 U101:1 A1 R113 270 ^R_0805 To LM13600 operational transconductance amp Figure 1.7 Figure 1.8 Figure 1.9

7 the transistor pair to keep crossover distortion minimal. In parallel with the trimpot is a 50-ohm thermistor with a negative temperature coefficient; as the circuitry warms, its resistance decreases. This reduces VBE on both Q105 and Q106, decreasing the bias current to reduce the threat of thermal runaway. The base of each driver transistor is tied to ground through a diode and a 2.2K trimpot in series; these set the current limiting threshold for their respective signal polarities. The collector of each driver transistor directly drives the bases of its output transistors, which are the main power-handling signal devices. If you’re not familiar with the grounded-collector scheme, the arrangement of the output transistors might look somewhat strange: the positive voltage swings are handled by PNP transistors, while the negative swings are handled by NPN devices. The collectors all connect to ground, which allows them to be mounted directly to the heat sink—metal-to-metal, without insulators in between—for the best possible transfer of heat away from the transistors. The emitters of the PNP and NPN transistors are coupled through resistors to the positive and negative supply rails, respectively, forming banks of common-emitter circuits driving the supply rails. Consequently, the devices drive the rails with the audio signal, which rides atop the DC. The output to the speaker load is taken from the point between the positive and negative reservoir capacitors; this is also where the negative feedback is taken from. The nature of this arrangement, with audio signal riding on the supply rails, is why the power supply has no ground reference. Another unusual characteristic of the grounded-collector output section is that the signal at the output to the speaker is actually opposite in polarity to the signal at the op amp output. This is why the negative feedback resistor, R122, connects to the op amp’s non- inverting input instead of the inverting input. The output point of the circuit couples to the output connector through an RLC network (R160, R161, R162, L100, and C124) that serves as a high-frequency snubber and also helps keep the amp circuitry stable when driving capacitive loads. R111 100 ^R_0805 R109 100 ^R_0805 10.0K ^R_0805 R103 3 + 8 7 5 1 4 - 2 U10:1 LM13600M R108 7.50K ^R_0805 +14V A1 R104 150K ^R_1206 -14V R110 270 ^R_0805 C105 100-25V R107 ^R_0805 39K Q100 3906 R115 820 ^R_1206 To input op amp U101:1 11 CLIP LIMIT SWITCH (Open to defeat clip limiter) From clip detection Clip detection The output of the op amp also drives a group of four diodes (D102, D103, D105, and D106) arranged as a full-wave rectifier. Normally, the op amp’s output signal level is about 1 volt or less, which is all it takes to drive the driver transistors. But because this point is within the overall feedback loop, when clipping occurs, the op amp puts out a much higher signal voltage to try to make the output signal track the input. The four diodes rectify the voltage to drive the clip indicator LED, LD100. The current exiting the full-wave rectifier passes to ground through R127 and also drives the base of transistor Q100 through R115. If the clip limiter is switched on, Q100’s emitter is grounded, and when the voltage across R127 goes sufficiently negative to forward-bias Q100, which sends current through R111 and R103 into the amplifier bias input of the operational transconductance amplifier (OTA), U10:1. The OTA is in the negative feedback loop of U101:1, and increasing its transconductance essentially reduces the impedance of the feedback loop, which reduces the gain of the op amp stage. This reduces the signal level until the amount of clipping is minimal. When the clipping stops, Q100 is no longer forward-biased, and the gain returns to normal. DC protection The RMX 2450 has a crowbar circuit, based on a triac and two silicon controlled rectifiers, on the output to protect against DC faults. If an amp channel puts out a DC voltage, which could be the result of a component or circuit failure, it will first trigger either D119 or D120, depending on the polarity of the voltage. The triggered SCR will in turn trigger triac Q113, shorting the output to ground through fuse F100. The fuse will blow, safeguarding the speaker load from the DC fault. The output sections of the RMX 850 and RMX 1450 are AC coupled. Class H The RMX 2450 utilizes a two-step Class H output section. It is essentially a Class AB+B circuit but with two sets of bipolar supply rails. On both the positive and the negative sets of rails, a compara- tor circuit, called a “step driver,” compares the audio signal to the lower rail voltage. When necessary to fully reproduce the signal’s voltage swing—just before the signal voltage reaches the lower rail voltage—the step driver turns on a TMOS power FET to pull the output transistors’ supply rail up from the lower voltage to the higher one, and then back down again when the signal allows. By keeping the transistors’ supply rails low whenever possible, the devices dissipate less unused power and generate less waste heat, making the amplifier more efficient than a straight class AB amplifier with the same power points. The comparators are 311-type ICs: U170 on the positive step and U171 on the negative. Each one drives a high-gain complementary transistor pair (2N3904 + 2N3906), which drive the gate of their respective MOSFET. Figure 1.10

Bridged mono operation and protection When the amplifier is operated in bridged mono, its two channels work in tandem to produce up to twice the voltage swing that a single channel is capable of. To do this, Channel 2 produces a signal identical to Channel 1’s, but opposite in polarity—in other words, a mirror image. Channel 2’s signal feed (bus BR_MONO_FEED) is an attenuated version of the signal on Channel 1’s speaker bus. Closing DIP switch #6 (set to “BRIDGE MONO ON”), connects the BR_MONO_FEED bus on Channel 1 to the BR_RET bus on Channel 2. The BR_RET bus drives the non-inverting input of op amp U201:2 directly. With two channels operating as one, but each having its own feedback and protection circuitry, it is vital to keep both running as mirror images. A protection circuit monitors the balance between Channel 1’s and Channel 2’s signals. Resistors R22 and R23 (R22A, R22B, R23A, and R23B on the RMX 2450) are equal in value and 2. Component identification and pinout 1 2 3 4 8 7 6 5 A B OUTPUT A INVERTING INPUT A NON-INVERTING INPUT A V- OUTPUT B INVERTING INPUT B NON-INVERTING INPUT B V+ 1 2 3 4 8 7 6 5 GROUND 1 NON-INVERTING INPUT INVERTING INPUT V- OUTPUT BALANCE/ STROBE BALANCE V+ 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A B NON-INVERTING INPUT A V- AMP BIAS INPUT B NON-INVERTING INPUT B INVERTING INPUT B OUTPUT B BUFFER INPUT B BUFFER OUTPUT B V+ DIODE BIAS B AMP BIAS INPUT A DIODE BIAS A INVERTING INPUT A OUTPUT A BUFFER INPUT A BUFFER OUTPUT A NE5532AN Dual operational amplifier LM311 Voltage comparator LM13600 Dual operational transconductance amplifier form a voltage divider between the two channel outputs. If the output signals are mirror images, the voltage at the junction of the resistors (bus BR_BAL) will be zero. If the signals are not mirror images—for example, one channel is defunct, distorting, or reduced in gain—a voltage will appear on BR_BAL. Through DIP switch 7, the BR_BAL bus becomes bus BR_CUT and feeds the bases of transistors Q8 and Q6, which are part of a 4-transistor circuit across the +15V and -15V rails that supply the op amps and the input circuitry. If the voltage on BR_CUT goes positive enough to forward- bias Q8, the transistor’s collector will collapse the +15V rail. At the same time, the emitter current from Q8 will flow through R25 and into the emitter of Q7, forward-biasing it, too. The collector of Q7 will then collapse the -15V rail. Similarly, if BR_BAL goes sufficiently negative, it will forward-bias Q6, in turn forward-biasing Q9, and these will collapse the ±15V rails. With the rails collapsed, the op amp and the input circuitry will not function, which will mute the audio. 4N29 Opto-isolator 1 2 3 6 5 4 2N5064 Sensitive gate thyristor K A G

9 B C E 1 2 3 B E C B C E TOSHIBA G D S B C E 2N3904 (NPN) and 2N3906 (PNP) Small-signal transistors MJE15032 (NPN) and MJE15033 (PNP) Driver transistors IRFZ44 TMOS power field effect transistor 2SC5200 (PNP) and 2SA1943 (NPN) Power transistors MAC224 Triac MT1 MT2 G

When first checking the operation of an amplifier on the bench, always turn your variable transformer down to zero before plugging the amplifier in. After you turn the amplifier on, gradually turn up the AC voltage as you observe the amplifier’s behavior and its current draw; this will help you determine what, if anything, is wrong with it. If you see or smell smoke, flames, or any other signs of short circuits or excessive current draw, quickly turn the AC back down to zero. If no such problems occur, it is usually safe to turn the AC up to the amplifier’s full operating voltage for further testing. 3.1 Excessive current draw The customer complains of blowing circuit breakers or fuses, or burning smell or smoke. Symptoms covered: • Fuses blow immediately • The amplifier quickly gets very hot • Line circuit breakers trip at turn-on • The amplifier hums loudly and the chassis vibrates • The amplifier emits smoke • The amplifier gives off a burning smell If the symptoms indicate a possible problem in the channel circuits or output sections, you can isolate either channel module from the power supply by pulling its fuses from the AC board. Possible situations: Excessive current with no signal present If the amplifier seems to run hot and draws higher-than-normal current when idling at full AC voltage, the cause could be bias misadjustments in the output circuitry of one or both channels. See the calibration procedures in the next section. In the RMX 2450, the cause might also be blown step FETs; see service bulletin RMX0006. Fast increase in current draw (current increases rapidly at only a few volts AC) • The main bridge rectifiers BR100 and/or BR200 (all models) and BR101 and/or BR201 (RMX 2450) is reversed or shorted. • Supply clamp diode pairs D117 and D118 and/or D217 and D218 is reversed or shorted. • The drivers and/or power transistors is shorted on both polarities (NPN and PNP) on one or both channels. Moderate increase in current draw (current increases slowly, doesn’t become excessive until about ¼ of the amplifier’s full AC operating voltage) • One polarity’s drivers and/or power transistors (NPN or PNP) is shorted, on one or both channels. • Individual supply clamp diodes D117, D118, D217, or D218 is reversed or shorted. • Bias diodes D108, D109, D208, or D209 or bias trimpots R131 or R231 is open. Slow increase in current draw (current doesn’t become excessive until about half of the amplifier’s full AC operating voltage; amplifier may pass signal) • The bias is severely misadjusted, or bias diodes D108, D109, D208, or D209 is defective. • An oscillation is causing excessive current demand. Runaway current draw (current increases sharply at about 25 to 33% of the amplifier’s full AC operating voltage) One or more reservoir capacitors is reversed. CAUTION: the gas buildup in a reversed electrolytic capacitor can cause it to vent explosively. Immediately turn off power and let the capacitor cool down before replacing it. 3.2 Protection, muting, and turn- on/turn-off delay problems The customer complains of amplifier locking up, or not turning on and off correctly. Symptoms covered: • Both channels do not come out of protect • Amplifier will not thermally shut down when it should • Power LED doesn’t light • Too little or too much muting delay • No clip limiting • Fan doesn’t run, or runs always at high speed Possible situations: Both channels stay in protect after turn-on • Q4 or Q5 is shorted base-to-emitter. • Voltage across D8 should be 14 to 15 volts DC. If it is low, check D8 and R10; also, C7 and C8 is leaky. • D9, R4, and/or R7 is open. The amplifier will not thermally shut down when it overheats Check for shorted D9, R4, or R7; check also for open LD1 (“POWER” LED), R2, or R5. Too much or too little muting delay • Excessive delay at turn-on: check for open LD1, R2, or R5; check for incorrect R10 or R15; check for shorted D9; also see service bulletin RMX0002. • Too short at turn-on (amplifier unmutes before the circuits stabilize, causing a thump): check for incorrect or bad C7, C8, or R10. • Amplifier doesn’t stay muted at turn-off: see service bulletin RMX0003 Power LED doesn’t light Check for open or shorted LD1; check R2. No clip limiting • U10 is defective. • DIP switches SW1:1 or SW1:10 is defective. 3. Troubleshooting: Symptoms, causes, & remedies

11 Fan doesn’t run • The fan is defective. • Check the fan connection to the AC board. • Check R1 and BR1 on the AC board. Fan runs always on high speed • Q3 and/or U2 are shorted. • Check PTC thermistors R4 and R7. 3.3 Faults with signal present The customer compains that the amplifier passes a signal but doesn’t run correctly. Symptoms covered: • The output signal breaks up or is distorted • “Ringing” sound in loudspeaker when no audio signal is present • The output signal collapses when driving a normal speaker load • Supply rails OK with no signal, but collapse when a signal passes • The amplifier gets too hot • One channel clips prematurely • Excessive hum in loudspeaker when no audio signal is present Possible situations: The output signal breaks up or is distorted • (RMX 850 and RMX 1450) Check the hum-null resistors R118, R119, R218, and R219. • Check the ground traces for continuity among speaker ground, input ground, and AC ground. “Ringing” sound in loudspeaker when no audio signal is present • Check C114, C124, C214 and C224. • Check or replace dual op amp U101 or U201. The output signal collapses when driving a normal speaker load • R139, R140, R239, and/or R240 is misadjusted. • Check R118, R119, R218, and R219. The supply rails are OK with no signal but collapse with a signal • C112, C113, C212, and/or C213 is leaky. • Check C114, C124, C214, and C224. The amplifier gets too hot with no load • Bias trimpots R131 or R231 are misadjusted, burned, or open. • Bias diodes D108, D109, D208 and/or D209 are incorrect (should be 1N4934). • If the amplifier is producing high-frequency oscillations, check C114, C124, C214, and C224. • Check resistors R136, R137, R236, and R237. • Op amp U101 or U201 is unstable. One channel clips prematurely • R146 or R147 (Channel 1) or R246 or R247 (Channel 2) are open. • R139 or R140 (Channel 1) or R239 or R240 (Channel 2) are misadjusted. • Check R157, R158, R198 (RMX 2450 only), D115, and D116 (Channel 1) or R157, R258, R298 (RMX 2450 only), D215, and D216 (Channel 2). • (RMX 850 and RMX 1450) Check R118 and R119 (Channel 1) or R218 and R219 (Channel 2). • R130 or R132 (Channel 1) or R230 or R232 (Channel 2) is open. Excessive hum in loudspeaker when no signal is present (RMX 850 and RMX 1450) Check R118, R119, R218, and R219. Excessive current draw with signal present (RMX 2450) • Check triacs Q113 and Q213. • Check D119, D120, D219 and D220. 3.4 Instability The customer complains of gain problems, spurious noises, or oscillations. Symptoms covered: • General output distortion • “Ringing” sound in loudspeaker trailing an audio signal • Excessive crossover distortion • The output waveform appears fuzzy on an oscilloscope Distinguish among the different symptoms of fuzziness (instability), ringing (momentary instability after a transition), crossover distor- tion (often causing ringing), or general distortion. Possible situations: General distortion in the output signal • Severe distortion, at any load, often with abnormally high current draw: check the slew rate capacitors C114, C115, and C116 (Channel 1) or C214, C215, and C216 (Channel 2). • Moderate distortion, especially with light loading: stability capacitors C124 and C126 (Channel 1) or C224 and C226 is too high in capacitance; also check the slew rate capacitors C114, C115, and C116 (Channel 1) or C214, C215, and C216 (Channel 2), and the output filter resistors R161, R162, R154, and R155 (Channel 1) or R261, R262, R254, or R255 (Channel 2). • Distortion with low gain: check the feedback shunt components R120, R138, and C125 (Channel 1) or R220, R238, or C225 (Channel 2); also check for broken circuit traces around the components; U101 (Channel 1) or U201 (Channel 2) is defective or its socket is contaminated. Ringing sound trailing the audio signal • This usually indicates marginal instability and is usually triggered by the signal passing through zero volts (the crossover point). Check the stability components and output filters. • With a sine wave test signal, use an oscilloscope to check for excessive crossover notch at the output signal’s zero crossings. Excessive crossover distortion (unbalanced, asymmetrical, or excessively large crossover notch) • Severe crossover discontinuity: bias diodes D108 or D109 (Channel 1) or D208 or D209 (Channel 2) are shorted. • Moderate discontinuity: bias diodes D108 or D109 (Channel 1) or D208 or D209 (Channel 2) are out of spec. • R131 (Channel 1) or R231 (Channel 2) is defective. • Base resistors R136 or R137 (Channel 1) or R236 or R237 (Channel 2) are open. Also check the NTC thermistors R134 (Channel 1) or R234 (Channel 2).

3.5 Power supply & rail balancing problems Symptoms covered: • Insufficient or excessive current limiting into a shorted load • Op amp rails too high with a shorted load • Uneven voltages on supply rails A channel’s output current should remain unaffected when driving resistive loads as low as 2 ohms per channel. When driving a short circuit, the current limiting circuit should collapse the output to a lower current. This is done by dropping the op amp’s supply rails from a normal ±14–15 volts down to about ±5–6 volts. Normally, the output signal helps replenish the op amp supply rails through D115 and D116 (Channel 1) and D215 and D216 (Channel 2), but a short circuit or excessively low load impedance prevents the replenish- ment, and the op amp rails collapse because they can’t supply enough current to let the op amp drive both the clip LED and the driver transistors. The current limit trimpots R139, R140, R239, and R240 permit adjustment of the current limit thresholds. See the RMX calibration section of this manual for adjustment procedures. Possible situations: Excessive current into short (insufficient limiting) • If the op amp rails are dropping to ±5 to 6 volts as they should: the 5.6V zener diodes D107 and/or D110 (Channel 1) or D207 and/or D210 (Channel 2) are reversed or shorted. • If high crossover distortion is present: bias diodes D108 or D109 (Channel 1) or D208 or D209 (Channel 2) are shorted. Excessive current into short (op amp rails are not dropping) • The op amp U101 (Channel 1) or U201 (Channel 2) is defective, with insufficient output current. • Clip LED LD100 (Channel 1) or LD200 (Channel 2) and/or its rectifying diodes (Channel 1: D102, D103, D105, D106; Channel 2: D202, D203, D205, D206) are open. • When driving a short circuit, the output section’s positive and negative supply rail voltages should be equal, within 3 volts. If they aren’t, check D107, D110, R146, and R147 (Channel 1) or D207, D210, R246, and R247 (Channel 2). Weak current into 2ΩΩΩΩΩ or short (excessive or premature limiting) • Bias resistors R130 and R132 (Channel 1) or R230 and R232 (Channel 2) are too high. • Driver transistors (Channel 1: Q105, Q106; Channel 2: Q205, Q206) have very low gain. • One or more emitter resistors in the output section are open. Current OK at 2ΩΩΩΩΩ, weak into short • LD100, D102, D103, D105, or D106 (Channel 1), or LD200, D202, D203, D205, or D206 (Channel 2), are shorted. • Zener voltage of diodes D107 or D110 (Channel 1), or D207 or D210 (Channel 2), is too high. Current limits properly into short, but current is weak at 2ΩΩΩΩΩ • If the op amp rails are low (< 14–15 volts) when driving a 2-ohm load without clipping, check the resistors R157 and R158 (Channel 1, all models), R198 (Channel 1, RMX 2450 only) and diodes D115 and D116 (Channel 1, all models), or R257 and R258 (Channel 2, all models), R298 (Channel 2, RMX 2450 only) and diodes D215 and D216 (Channel 2, all models). • If the op amp rails are normal (14–15 volts) when driving a 2-ohm load without clipping, usually the output section gain is too low: weak driver transistors, open output transistors, or open emitter resistors. Check the value of the driver transistors’ emitter resistors, too: R146 and R147 (Channel 1) or R246 and R247 (Channel 2). Rail voltages unequal The balance between the positive and negative rail voltages is set by a voltage divider comprising resistors R118 and R119 (Channel 1) and R218 and R219 (Channel 2). If the amplifier channel passes a signal but clips unevenly due to unequal rail voltages, this voltage divider is the likely culprit. 4.1 Setting bias Always set the bias • after replacing any output or driver transistor. • after replacing any diode or resistor in the driver/output circuitry. • if the amplifier seems to run too hot at idle. • if the amplifier exhibits crossover distortion. The bias network sets the quiescent base current in the NPN and PNP driver transistors, which in turn sets the quiescent current in the output transistors. The driver transistors should both be slightly “on” at idle so that the transitions of the signal voltage between positive and negative are smooth and free of gaps or glitches. Too 4. RMX calibration procedures much bias current will cause the amplifier to run hotter than it should, especially at idle, while too little will cause noticeable crossover distortion, especially at low signal levels. The amplifier circuitry must be cool, or at least within a couple degrees of ambient air temperature, and the top cover must be removed. If the driver and output transistors are significantly warmer than the ambient air, leave the amplifier off and let it cool before proceeding. Before turning the amplifier on to set bias on one or both channels, familiarize yourself with the locations of the trimpots (R131 and R231) and the voltage measuring points so you can work quickly but thoroughly. If the amplifier warms up before you finish setting the

13 bias, you will need to shut the amplifier off and let it cool down before you resume. Tools and resources you will need: • Small flat screwdriver (non-conductive) for adjusting trimpots • DC voltmeter • AC power Procedure 1. Turn the amplifier’s gain controls all the way down. No test signal is needed. 2. Plug the amplifier into an appropriate AC source. Turn the amplifier on. 3. Channel 1: While measuring the DC voltage across resistor R146, adjust trimpot R131 to obtain the voltage listed in Table 1. 4. Channel 2: While measuring the DC voltage across resistor R246, adjust trimpot R231 to obtain the voltage listed in Table 1. After setting the bias, calibrate the positive and negative current limiting; instructions for the procedure follow below. 4.2 Setting positive and negative current limits Tools and resources you will need • Oscilloscope • 2-ohm resistive load (rated for at least 1200 watts) • Shorting connector for amplifier output • Variable AC transformer (e.g., Variac, Powerstat, etc.) rated for 25A (120V) or 12A (230V). Make sure the AC supply is appropri- ate for the amplifier. • 1 kHz audio sine wave generator • Digital multimeter • Clamp-on digital current meter (e.g., Fluke 30 Clamp Meter) • Small flat screwdriver (non- conductive) for adjusting trimpots Procedure 1. Set the audio sine generator to 1 kHz at 1 volt RMS and connect it to Channel 1's input. Connect a 2-ohm load and the oscilloscope probe across Channel 1's output. 2. Turn up Channel 1's gain control partway. On the oscilloscope you should see the amplitude of the sine wave increase accordingly. 3. Turn the gain control back down and apply a short circuit across the output terminals of Channel 1. Clamp a current probe either s n oita r bila C ts ujd A 0 5 8 X M R 0 5 4 1 X M R 0 5 4 2 X M R 6 4 1 R ss orc a e g atlo v C D :s aib 1 le n n a h C 1 3 1 R V 6 1.0 V 4 1.0 V 9 0.0 6 4 2 R ss orc a e g atlo v C D :s aib 2 le n n a h C 1 3 2 R V 6 1.0 V 4 1.0 V 9 0.0 d a ol d etro h s otnitn erru c tu ptu O 0 4 1 R & 9 3 1 R :1 le n n a h C 0 4 2 R & 9 3 2 R :2 le n n a h C A 5.4 – 4 A 5 – 4 A 9 – 8 * d a ol d etro h s g nivird n e h w tn erru c C A 0 4 1 R & 9 3 1 R :1 le n n a h C 0 4 2 R & 9 3 2 R :2 le n n a h C A 5.4 – 5 7.3 A 5.5 – 5.4 A 5.6 – 5 )S M R( s m h o 2 otni e g atlo v g nip pilC 9 3 1 R ts ujd A :1 le n n a h C yrte m m ys rof 9 3 2 R ts ujd A :2 le n n a h C yrte m m ys rof V 9 2 – 6 2 V 5.7 3 – 5.3 3 V 9 4 – 4 4 )k a e p( s m h o 2 otni e g atlo v g nip pilC 9 3 1 R ts ujd A :1 le n n a h C yrte m m ys rof 9 3 2 R ts ujd A :2 le n n a h C yrte m m ys rof V 1 4 – 8.6 3 V 3 5 – 4.7 4 V 3.9 6 – 2.2 6 ;erutare p m et tn eib m a ta( * d n a m e d C A eldI )to h n e h w re h gih ,A 4.0 % 0 1 ± ,A 4.0 % 0 1 ± A 5.0 , % 0 1 ± .V 0 3 2 rof 5.0 y b tn erru c ylpitlu m ;sreifilp m a V 0 2 1 rof era n w o h s s eru giF * onto one of the brown wires running to the AC switch or onto the gray output wire from channel 1's module. 4. Turn the gain control all the way up. Adjust trimpots R139 and R140 equally until the current measured falls within the range shown in Table 1. 5. Turn the gain control all the way down and remove the short circuit so the channel drives the 2-ohm load. Turn the gain control back up until the output clips. The voltage at which the signal starts to clip should fall within the range shown in Table 1. If the clipping is asymmetrical, that is, the signal clips on either the positive or negative side first, adjust R139 to make it symmetrical. 6. Turn the gain control down. If the amp has begun to warm up shut it off and let it cool a few minutes before proceeding with Channel 2. 7. Repeat steps 1 through 5 for Channel 2. Use trimpots R239 and R240 to adjust the current limiting in steps 11 and 12. 8. Turn both channels’ gain controls all the way down. Clamp the ammeter onto one of the amp’s AC wires and check the amp’s idle current. If the amplifier is still at about room temperature, the idle current should match the value shown in Table 1. Table 1: Bias and current limit adjustments

5. Servicing RMX amplifiers 5.1 Mechanical disassembly and re-assembly Replacing components will usually require removing the channel modules and/or AC board from the amplifier chassis, especially on the RMX 850 and RMX 1450, which have single-side printed circuit boards. The RMX 2450 has double-side boards; many of the through-hole components on the upper side of the board can be unsoldered and soldered from the top side of the board, so removing modules or boards is not always necessary. See the fold-out assembly guides on pages 23 and 24 in this manual for assistance. NOTE: As viewed from the front of the amplifier, the left channel module is Channel 1 and the right is Channel 2 except in the RMX 2450; its right module is Channel 1, and its left is Channel 2. Removing the channel modules 1. Disconnect the amplifier from AC power and allow at least 10 minutes for internal voltages to bleed down. 2. Using a Philips screwdriver, remove the screws that fasten the top cover to the chassis. Also remove the top cover’s four recessed screws that fasten it to the heat sinks. As you remove screws, set them aside, but also make note of where each type is used so you can properly re-assemble the amplifier. 3. Lift the top cover up at the rear and carefully pull it toward the back, removing the five hooks on the front edge from their slots in the chassis. 4. Pull the gain control knobs straight off from the potentiometer shafts. 5. Tip the amplifier up on its side and remove the four screws that fasten the heat sinks to the chassis. 6. Set the amplifier back down and remove the screws that mount the channel modules to the chassis standoffs. There are six screws in the left module and five in the right one. 7. Remove the four screws that fasten the fan, fan shroud, and fan guard to the chassis. Lift the fan shroud out from the chassis; this will give you room to properly remove the modules from the chassis. 8. Disconnect the wire and cable connections to the channel modules. All of the connections are either detachable headers or ¼-inch quick-connect tabs that are disconnected by pulling them straight up. No unsoldering is necessary. 9. Slide the channel modules toward the back so the potentiometer shafts and front panel LEDs are clear of their holes in the front panel. Lift the channel modules out from the chassis. 10. Re-assembly is the opposite of disassembly. Removing the AC board The AC board provides AC voltage selection, rectification of the transformer secondary current, and a regulated DC supply for the cooling fan. It seldom needs to be replaced unless it is physically damaged itself. Most failures involving the AC board can be repaired through replacement of individual components. WARNING: Regulatory agencies require that any operating voltage conversions from 120 volts to any other voltage be done only by QSC’s factory service. Any other operating voltage conversions may be done only by a QSC-authorized service center or international distributor. 1. Disconnect the amplifier from AC power and allow at least 10 minutes for internal voltages to bleed down. 2. Remove the four screws that fasten the fan, fan shroud, and fan guard to the chassis. Lift the fan shroud out from the chassis. 3. Disconnect the wires that connect to the channel modules. All of the large single wires attach to the channel modules with ¼-inch quick-connect tabs that are detached by pulling them straight up. The remaining three black wires disconnect at the left channel module with a detachable header. If you are planning to replace the AC board with another, carefully cut each of the transformer wires connecting to the board just above its solder tab. You must leave enough slack to allow connection to the new AC board. Remove the old heat shrink tubing from the wires and strip the wire ends about 0.25 inch or 6.3 mm. 4. Remove the five screws that attach the AC board to the chassis standoffs. Lift the board out from the chassis. 5. Re-assembly is the opposite of disassembly. If you’re using a new AC board, slide new pieces of heat shrink tubing over the trans- former wires before you solder them to the appropriate tabs on the board; after soldering, cover the joints with the tubing and use a heat gun or other heat source to shrink them tightly.

15 6. Replacement parts 6.1 RMX 850 Replacement Parts QSC part # Description Qty. Notes or Component Reference Misc. 1806-2505-0 POWER TRANSFORMER 700 1 2113-1144-0 AC INLET 1 2444-1001-1 KNOB CONTROL 2 4134-8432-0 RACK-MOUNT BRACKET 2 5200-4717-0 ROCKER POWER SWITCH 1 5200-3532-0 CIRCUIT BREAKER 10A 1 For 120V models 5200-4730-0 CIRCUIT BREAKER 5A 1 For 230V models 7010-9640-0 AC CORD SET 15A 1 For 120V models 7009-8620-0 POWER CORD SET CE 1 For 230V models 8900-9050-1 DC FAN 24V 80X80 (+5V) 1 AC board 153R-224K-5-Y1 CM 250V 0.22uF 10% RL 2 C127, C227 157Q-108M-5-X9E CE 35V 1000UF 20% RL 1 C6 3130-9270-0 IC 4N29 1 U2 4134-8851-0 FUSE HOLDER (DIA.6.3MM 4 REF: F100, F200 4701-202J-C RCF 1/8W 2K 5% ATS 1 R13 4701-474J-C RCF 1/8W 470K 5% ATS 1 R12 4701-682J-C RCF 1/8W 6.8K 5% ATS 2 R9, R14 4719-121J-1-X RMF 2W 120R 5% AL METAL 1 R17 4840-1760-0 DIODE RECT 1A 200V DB103 1 BR1 4840-2150-0 BRIDGE RECTIFIER 400V 2 BR100, BR200 4860-2620-5 TR TIP31C SAMSUNG 1 Q3 5100-1030-3A FU T10A 125V/250V 2 F100, F200 5400-0831-0 HEATSINK 1 REF: Q3 8910-0273-0 POLYSWITCH 0.15 ohm 1.1A 1 R1 8910-0275-0 THERMAL NTC 30A 1 ohm 1 R21 Channel 1 module 153F-223J-5-LQ CM 50V 0.022UF 5% RL 2 C116, C119 153F-332J-5-KW CM 50V 3300pF 5% RL 6x12 2 C117, C118 153R-683J-5-WWM CM 250V 0.068u 5% RL 1 C124 157F-476M-5-LU CE 50V 47uF 20% RL 1 C8 157R-475M-5-OV CE 250V 4.7u 20% RL 1 C7 1804-1030-0 SPRING COIL 2uH 1 L100 3700-4531-G LED 04mm GREEN W/STAND 1 LD1 4718-220J-2-P RMF 1W 22R 5% AT FP 2 R136, R137 4718-6R8J-1-X RMF 1W 6.8R 5% AL METAL 2 R146, R147 4719-153J-1-X RMF 2W 15K 5% AL METAL 2 R2, R5 4719-5R6J-1-X RMF 2W 5.6R 5% AL METAL 1 R160 471A-022K-5-N RMF 3W 0.22R 10% RL RGC3 6 R142, R148, R149, R152, R153, R159 471B-120J-1-X RMF 5W 12R 5% AL METAL 2 R161, R162 471B-202J-1-X RMF 5W 2K 5% AL METAL 2 R133, R135 471B-821J-1-X RMF 5W 820R 5% AL METAL 2 R157, R158 4756-1016-3-06 SVR H6 100R RH0615C 1 R131 4756-2226-3-06 SVR 2.2K H3 7X7.6 R0615C 2 R139, R140 4804-0040-1 DIODE IN4004 AL 5 D1, D11, D12, D117, D118 4804-9340-2 DIODE IN4934 AT 2 D108, D109 4837-5B10-2 DZ 1/2W 5.5-5.8V AT 2 D107, D110 4838-15V6-2 DZ 1W 15V AT TEMIC 2 D8, D15 4860-5020-5 TR MJE15032 1 Q105 4860-5030-5 TR MJE15033 1 Q106

4860-5050-5 TR 2SC5200 T0-3P (L) 3 Q108, Q110, Q112 4860-5060-5 TR 2SA1943 T0-3P (L) 3 Q103, Q107, Q109 4860-8890-0 TR MPS A06 VCE 80V NS 1 Q5 8910-0062-0 CE 80V 4700U 20% RL 25X 2 C120, C121 8910-0274-0 THERMAL PTC 60C 100 ohm 1 R7 8910-0488-0 ROD THERMISTOR NTC 50ohm 1 R134 Channel 1 SMT parts 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 1 C115 150H-102J-6-CF CC 100V 0.001U 5% 1206 1 C114 4720-103J-J RMG 1/10W 10K 5% 0805 1 R128 4720-152J-J RMG 1/10W 1.5K 5% 0805 1 R129 4720-202J-J RMG 1/10W 2K 5% 0805 1 R8 4720-224J-J RMG 1/10W 220K 5% 0805 1 R26 4720-470J-J RMG 1/10W 47R 5% 0805 2 R25, R124 4721-105J-6 RMG 1/8W 1M 5% 1206 2 R3, R6 4721-154J-6 RMG 1/8W 150K 5% 1206 1 R10 4721-224J-6 RMG 1/8W 220K 5% 1206 2 R18, R27 4721-473J-6 RMG 1/8W 47K 5% 1206 1 R125 4721-474J-6 RMG 1/8W 470K 5% 1206 1 R15 4721-682J-6 RMG 1/8W 6.8K 5% 1206 1 R19 4721-821J-6 RMG 1/8W 820R 5% 1206 2 R130, R132 4804-1480-3 DIODE LL4148 SM 15 D2–D7, D9, D14, D104, D111–D116 4853-9060-3 TR 3906 PNP SM 3 Q4, Q6, Q7 4860-0640-3 TR 3904 HFE 100-300 SM 4 Q8, Q9, Q101, Q102 4860-5110-3 TR KST42 1 Q1 Channel 2 module 153F-154J-5-NLM CM 50V 0.15UF 5% RL 4 C108, C109, C208, C209 153F-223J-5-LQ CM 50V 0.022UF 5% RL 2 C216, C219 153F-224J-5-NLM CM 50V 0.22UF 5% RL 2 C107, C207 153F-332J-5-KW CM 50V 3300pF 5% RL 6x12 2 C217, C218 153R-683J-5-WWM CM 250V 0.068u 5% RL 1 C224 157E-107M-5-KW CE 25V 100uF 20% RL 6x12 2 C105, C205 157E-227M-5-PU CE 25V 220uF 20% RL 4 C112, C113, C212, C213 157F-106M-5-LUN CE 50V 10¦F 20% RL 2 C106, C206 1804-1030-0 SPRING COIL 2uH 1 L200 2101-1991-0 8 PIN IC SOCKET DIP 2 REF: U101, U201 3130-2430-0 IC-NE5532 OPER. AMP PHIL 2 U101, U201 3700-4529-R LED 04mm RED W/STAND 2 LD100, LD200 3700-4530-Y LED 04mm YELLOW W/STAND 2 LD101, LD201 471A-022K-5-N RMF 3W 0.22R 10% RL RGC3 6 R242, R248, R249, R252, R253, R259 471B-120J-1-X RMF 5W 12R 5% AL METAL 2 R261, R262 471B-202J-1-X RMF 5W 2K 5% AL METAL 2 R233, R235 471B-821J-1-X RMF 5W 820R 5% AL METAL 2 R257, R258 4717-103A-2 RMF 1/2W 10K 1% AT 2 R122, R222 4717-9091-2 RMF 1/2W 9.09K 1% AT 1 R123 4718-220J-2-P RMF 1W 22R 5% AT FP 2 R236, R237 4750-6200-0 VR V012CPH, D-SHAFT 10K 2 R112, R212 4756-1016-3-06 SVR H6 100R RH0615C 1 R231 4756-2226-3-06 SVR 2.2K H3 7X7.6 R0615C 2 R239, R240 4718-6R8J-1-X RMF 1W 6.8R 5% AL METAL 3 R20, R246, R247 4719-5R6J-1-X RMF 2W 5.6R 5% AL METAL 1 R260 4804-0040-1 DIODE IN4004 AL 4 D10, D13, D217, D218 4804-9340-2 DIODE IN4934 AT 2 D208, D209 4837-5B10-2 DZ 1/2W 5.5-5.8V AT 2 D207, D210 4838-15V6-2 DZ 1W 15V AT TEMIC 4 D100, D101, D200, D201 4860-5020-5 TR MJE15032 1 Q205 Channel 1 module (continued) QSC part # Description Qty. Notes or Component Reference

17 4860-5030-5 TR MJE15033 1 Q206 4860-5050-5 TR 2SC5200 T0-3P (L) 3 Q208, Q210, Q212 4860-5060-5 TR 2SA1943 T0-3P (L) 3 Q203, Q207, Q209 8910-0062-0 CE 80V 4700U 20% RL 25X 2 C220, C221 8910-0274-0 THERMAL PTC 60C 100 ohm 1 R4 8910-0488-0 ROD THERMISTOR NTC 50ohm 1 R234 Channel 2 SMT parts 150F-104K-6-CF CER2 1206 X7R 50V 100N 3 C100, C102, C104 150F-181K-J-BD CC 50V 180P 10% 0805 4 C101, C103, C201, C203 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 1 C215 150F-560K-J-BD CC 50V 56pF 10% 0805 1.2 2 C110, C210 150H-102J-6-CF CC 100V 0.001µF 5% 1206 1 C214 15CG-560J-6-CF CTC 0/30 56P 5% 1206 2 C111, C211 3131-9730-0 IC NE5517D 1 U10 4720-101J-J RMG 1/10W 100R 5% 0805 6 R109, R110, R127, R209, R211, R227 4720-102J-J RMG 1/10W 1K 5% 0805 3 R102, R126, R202 4720-103A-J RMG 1/10W 10K 1% 0805 8 R100, R101, R105, R106, R200, R201, R205, R206 4720-103J-J RMG 1/10W 10K 5% 0805 3 R103, R203, R228 4720-152J-J RMG 1/10W 1.5K 5% 0805 1 R229 4720-203A-J RMG 1/10W 20K 1% 0805 4 R117, R121, R217, R221 4720-271J-J RMG 1/10W 270R 5% 0805 6 R111, R113, R120, R210, R213, R220 4720-332J-J RMG 1/10W 3.3K 5% 0805 1 R24 4720-393J-J RMG 1/10W 39K 5% 0805 2 R107, R207 4720-470J-J RMG 1/10W 47R 5% 0805 1 R224 4720-472J-J RMG 1/10W 4.7K 5% 0805 2 R114, R214 4720-752J-J RMG 1/10W 7.5K 5% 0805 2 R108, R208 4721-154A-6 RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 4721-154J-6 RMG 1/8W 150K 5% 1206 2 R104, R204 4721-333J-6 RMG 1/8W 33K 5% 1206 2 R22, R23 4721-394J-6 RMG 1/8W 390K 5% 1206 2 R116, R216 4721-473J-6 RMG 1/8W 47K 5% 1206 1 R225 4721-821J-6 RMG 1/8W 820R 5% 1206 4 R115, R215, R230, R232 4804-1480-3 DIODE LL4148 SM 15 D102, D103, D105, D106, D202–D206, D211–D216 4853-9060-3 TR 3906 PNP SM 2 Q100, Q200 4860-0640-3 TR 3904 HFE 100-300 SM 2 Q201, Q202 Input board 150F-471J-5-OF CC 50V 470pF 5% RL 8x3.5 4 C1–C4 7010-9860-0 26 PIN IEC RIBBON CABLE 1 J1 2113-1337-1 XLR FEMALE CONN. 2 J101, J201 2113-1652-0 PHONE JACK 06.4 2 J102, J202 2113-1335-0 5 POLE SPEAKER TERMINAL 1 J5 5200-4713-0 10 POLE DIP SWITCH 1 SW1 Output board 2113-1336-1 SPEAKON NEUTRIK 4 WIRE 2 J100, J200 2113-1338-0 4-POLE SPEAKER TERMINAL 1 J103 4154-2111-0 OUTPUT POST PLUG FOR CE 2 For European models only 4154-2121-0 OUTPUT POST PLUG FOR CE 2 For European models only Channel 2 module (continued) QSC part # Description Qty. Notes or Component Reference

6.2 RMX 1450 Replacement Parts QSC part # Description Qty. Notes or Component Reference Misc. 1806-2506-0 POWER TRANSFORMER, 1200 1 2113-1144-0 AC INLET 1 4134-9101-0 METAL WIND GUIDE 1 4154-0361-0 FAN GUIDE 1 5200-4717-0 ROCKER POWER SWITCH 1 5200-3531-0 CIRCUIT BREAKER 15A 1 For 120V models 5200-4731-0 CIRCUIT BREAKER 8A 1 For 230V models 7010-9640-0 AC CORD SET 15A 1 For 120V models 7009-8620-0 POWER CORD SET CE 1 For 230V models 8900-9050-1 DC FAN 24V 80X80 (+5V) 1 AC Board 153R-224K-5-Y1 CM 250V 0.22uF 10% RL 2 C127, C227 157Q-108M-5-X9E CE 35V 1000UF 20% RL 1 C6 3130-9270-0 IC 4N29 1 U2 4134-8851-0 FUSE HOLDER (DIA.6.3MM 4 REF: F100, F200 4701-202J-C RCF 1/8W 2K 5% ATS 1 R13 4701-474J-C RCF 1/8W 470K 5% ATS 1 R12 4701-682J-C RCF 1/8W 6.8K 5% ATS 2 R9, R14 4719-121J-1-X RMF 2W 120R 5% AL METAL 1 R17 4840-1760-0 DIODE RECT 1A 200V DB103 1 BR1 4840-2150-0 BRIDGE RECTIFIER 400V 2 BR100, BR200 4860-2620-5 TR TIP31C SAMSUNG 1 Q3 5120-0061-0 FUSE T12A/250V 6.3X32MM 2 F100, F200 5400-0831-0 HEATSINK 1 REF: Q3 8910-0273-0 POLYSWITCH 0.15 ohm 1.1A 1 R1 8910-0275-0 THERMAL NTC 30A 1 ohm 1 R21 Channel 1 module 153F-223J-5-LQ CM 50V 0.022UF 5% RL 2 C116, C119 153F-332J-5-KW CM 50V 3300pF 5% RL 6x12 2 C117, C118 153R-683J-5-WWM CM 250V 0.068u 5% RL 1 C124 157F-476M-5-LU CE 50V 47uF 20% RL 1 C8 157R-475M-5-OV CE 250V 4.7u 20% RL 1 C7 1804-1040-0 SPRNG COIL 2uH(14gaWIRE) 1 L100 3700-4531-G LED 04mm GREEN W/STAND 1 LD1 4718-220J-2-P RMF 1W 22R 5% AT FP 2 R136, R137 4718-6R8J-1-X RMF 1W 6.8R 5% AL METAL 2 R146, R147 4719-153J-1-X RMF 2W 15K 5% AL METAL 2 R2, R5 4719-5R6J-1-X RMF 2W 5.6R 5% AL METAL 1 R160 471A-022K-5-N RMF 3W 0.22R 10% RL RGC3 8 R142, R143, R148, R149, R152, R153, R156, R159 471B-102J-1-X RMF 5W 1K 5% AL METAL 2 R157, R158 471B-120J-1-X RMF 5W 12R 5% AL METAL 2 R161, R162 471B-302J-1-X RMF 5W 3K 5% AL METAL 2 R133, R135 4756-1016-3-06 SVR H6 100R RH0615C 1 R131 4756-2226-3-06 SVR 2.2K H3 7X7.6 R0615C 2 R139, R140 4804-0040-1 DIODE IN4004 AL 5 D1, D11, D12, D117, D118 4804-9340-2 DIODE IN4934 AT 2 D108, D109 4837-5B10-2 DZ 1/2W 5.5-5.8V AT 2 D107, D110 4838-15V6-2 DZ 1W 15V AT TEMIC D8, D15 4860-5020-5 TR MJE15032 1 Q105 4860-5030-5 TR MJE15033 1 Q106 4860-5050-5 TR 2SC5200 T0-3P (L) 4 Q104, Q108, Q110, Q112 4860-5060-5 TR 2SA1943 T0-3P (L) 4 Q103, Q107, Q109, Q111 4860-8890-0 TR MPS A06 VCE 80V NS 1 Q5 8910-0272-0 CE 100V 3300u 20% 25X50 4 C120–C123

19 8910-0274-0 THERMAL PTC 60C 100 ohm 1 R7 8910-0488-0 ROD THERMISTOR NTC 50ohm 1 R134 Channel 1 SMT parts 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 1 C115 150H-102J-6-CF CC 100V 0.001U 5% 1206 1 C114 4720-103J-J RMG 1/10W 10K 5% 0805 1 R128 4720-152J-J RMG 1/10W 1.5K 5% 0805 1 R129 4720-202J-J RMG 1/10W 2K 5% 0805 1 R8 4720-224J-J RMG 1/10W 220K 5% 0805 1 R26 4720-470J-J RMG 1/10W 47R 5% 0805 2 R25, R124 4721-105J-6 RMG 1/8W 1M 5% 1206 2 R3, R6 4721-154J-6 RMG 1/8W 150K 5% 1206 1 R10 4721-224J-6 RMG 1/8W 220K 5% 1206 2 R18, R27 4721-473J-6 RMG 1/8W 47K 5% 1206 1 R125 4721-474J-6 RMG 1/8W 470K 5% 1206 1 R15 4721-682J-6 RMG 1/8W 6.8K 5% 1206 1 R19 4721-821J-6 RMG 1/8W 820R 5% 1206 2 R130, R132 4804-1480-3 DIODE LL4148 SM 15 D2–D7, D9, D14, D104, D111–D116 4853-9060-3 TR 3906 PNP SM 3 Q4, Q6, Q7 4860-0640-3 TR 3904 HFE 100-300 SM 4 Q8, Q9, Q101, Q102 4860-5110-3 TR KST42 1 Q1 Channel 2 module 153F-154J-5-NLM CM 50V 0.15UF 5% RL 4 C108, C109, C208, C209 153F-223J-5-LQ CM 50V 0.022UF 5% RL 2 C216, C219 153F-224J-5-NLM CM 50V 0.22UF 5% RL 2 C107, C207 153F-332J-5-KW CM 50V 3300pF 5% RL 6x12 2 C217, C218 153R-683J-5-WWM CM 250V 0.068u 5% RL 1 C224 157E-107M-5-KW CE 25V 100uF 20% RL 6x12 2 C105, C205 157E-227M-5-PU CE 25V 220uF 20% RL 4 C112, C113, C212, C213 157F-106M-5-LUN CE 50V 10¦F 20% RL 2 C106, C206 1804-1040-0 SPRNG COIL 2uH(14gaWIRE) 1 L200 2101-1991-0 8 PIN IC SOCKET DIP 2 REF: U101, U201 3130-2430-0 IC-NE5532 OPER. AMP PHIL 2 U101, U201 3700-4529-R LED 04mm RED W/STAND 2 LD100, LD200 3700-4530-Y LED 04mm YELLOW W/STAND 2 LD101, LD201 471A-022K-5-N RMF 3W 0.22R 10% RL RGC3 8 R242, R243, R248, R249, R252, R253, R256, R259 471B-102J-1-X RMF 5W 1K 5% AL METAL 2 R257, R258 471B-120J-1-X RMF 5W 12R 5% AL METAL 2 R261, R262 471B-302J-1-X RMF 5W 3K 5% AL METAL 2 R233, R235 4717-1132-2 RMF 1/2W 11.3K 1% AT 1 R123 4717-1332-2 RMF 1/2W 13.3K 1% AT 2 R122, R222 4718-220J-2-P RMF 1W 22R 5% AT FP 2 R236, R237 4718-6R8J-1-X RMF 1W 6.8R 5% AL METAL 3 R20, R246, R247 4719-5R6J-1-X RMF 2W 5.6R 5% AL METAL 1 R260 4750-6200-0 VR V012CPH, D-SHAFT 10K 2 R112, R212 4756-1016-3-06 SVR H6 100R RH0615C 1 R231 4756-2226-3-06 SVR 2.2K H3 7X7.6 R0615C 2 R239, R240 4804-0040-1 DIODE IN4004 AL 4 D10, D13, D217, D218 4804-9340-2 DIODE IN4934 AT 2 D208, D209 4837-5B10-2 DZ 1/2W 5.5-5.8V AT 2 D207, D210 4838-15V6-2 DZ 1W 15V AT TEMIC 4 D100, D101, D200, D201 4860-5020-5 TR MJE15032 1 Q205 4860-5030-5 TR MJE25033 1 Q206 4860-5050-5 TR 2SC5200 T0-3P (L) 4 Q204, Q208, Q210, Q212 4860-5060-5 TR 2SA1943 T0-3P (L) 4 Q203, Q207, Q209, Q211 8910-0272-0 CE 100V 3300u 20% 25X50 4 C220–C223 Channel 2 module (continued) QSC part # Description Qty. Notes or Component Reference

8910-0274-0 THERMAL PTC 60C 100 ohm 1 R4 8910-0488-0 ROD THERMISTOR NTC 50ohm 1 R234 Channel 2 SMT Parts 150F-104K-6-CF CER2 1206 X7R 50V 100N 3 C100, C102, C104 150F-181K-J-BD CC 50V 180P 10% 0805 4 C101, C103, C201, C203 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 1 C215 150F-560K-J-BD CC 50V 56pF 10% 0805 1.2 2 C110, C210 150H-102J-6-CF CC 100V 0.001U 5% 1206 1 C214 15CG-560J-6-CF CTC 0/30 56P 5% 1206 2 C111, C211 3131-9730-0 IC NE5517D 1 U10 4720-101J-J RMG 1/10W 100R 5% 0805 6 R109, R110, R127, R209, R211, R227 4720-102J-J RMG 1/10W 1K 5% 0805 3 R102, R126, R202 4720-103A-J RMG 1/10W 10K 1% 0805 8 R100, R101, R105, R106, R200, R201, R205, R206 4720-103J-J RMG 1/10W 10K 5% 0805 3 R103, R203, R228 4720-152J-J RMG 1/10W 1.5K 5% 0805 1 R229 4720-203A-J RMG 1/10W 20K 1% 0805 4 R117, R121, R217, R221 4720-271J-J RMG 1/10W 270R 5% 0805 6 R111, R113, R120, R210, R213, R220 4720-332J-J RMG 1/10W 3.3K 5% 0805 1 R24 4720-393J-J RMG 1/10W 39K 5% 0805 2 R107, R207 4720-470J-J RMG 1/10W 47R 5% 0805 1 R224 4720-472J-J RMG 1/10W 4.7K 5% 0805 2 R114, R214 4720-752J-J RMG 1/10W 7.5K 5% 0805 2 R108, R208 4721-154A-6 RMG 1/8W 150K 1% 1206 4 R118, R119, R218, R219 4721-154J-6 RMG 1/8W 150K 5% 1206 2 R104, R204 4721-333J-6 RMG 1/8W 33K 5% 1206 2 R22, R23 4721-473J-6 RMG 1/8W 47K 5% 1206 1 R225 4721-4993-6 RMG 1/8W 499K 1% 1206 2 R116, R216 4721-821J-6 RMG 1/8W 820R 5% 1206 4 R115, R215, R230, R232 4804-1480-3 DIODE LL4148 SM 15 D102, D103, D105, D106, D202–D206, D211–D216 4853-9060-3 TR 3906 PNP SM 2 Q100, Q200 4860-0640-3 TR 3904 HFE 100-300 SM 2 Q201, Q202 Input Board 150F-471J-5-OF CC 50V 470pF 5% RL 8x3.5 4 C1, C2, C3, C4 2113-1337-1 XLR FEMALE CONN. 2 J101, J201 2113-1652-0 PHONE JACK 1/4" 6.4 mm 2 J102, J202 5200-4713-0 10 POLE DIP SWITCH 1 SW1 7010-9860-0 26 PIN IEC RIBBON CABLE 1 J1 Output Board 2113-1336-1 SPEAKON NEUTRIK 4 WIRE 2 J100, J200 2113-1338-0 4-POLE SPEAKER TERMINAL 1 J103 4154-2111-0 OUTPUT POST PLUG FOR CE 2 For European models only 4154-2121-0 OUTPUT POST PLUG FOR CE 2 For European models only Channel 2 module (continued) QSC part # Description Qty. Notes or Component Reference

21 6.3 RMX 2450 Replacement Parts QSC part # Description Qty. Notes or Component Reference Misc. 1806-2507-0 POWER TRANSFORMER, 1800 1 2113-1144-0 AC INLET 1 4134-9101-0 METAL WIND GUIDE 1 4154-0361-0 FAN GUIDE 1 5200-4717-0 ROCKER POWER SWITCH 1 5200-3531-0 CIRCUIT BREAKER 15A 1 For 120V models 5200-4731-0 CIRCUIT BREAKER 8A 1 For 230V models 7010-9640-0 AC CORD SET 15A 1 For 120V models 7009-8620-0 POWER CORD SET CE 1 For 230V models 8900-9050-1 DC FAN 24V 80X80 (+5V) 1 AC Board 4701-202J-C RCF 1/8W 2K 5% ATS 1 R13 4701-474J-C RCF 1/8W 470K 5% ATS 1 R12 4701-682J-C RCF 1/8W 6.8K 5% ATS 2 R9, R14 153R-224K-5-Y1 CM 250V 0.22uF 10% RL 4 C127, C128, C227, C228 153T-473K-5-WS CM 400V 0.047UF 10% RL 1 C10 157Q-108M-5-X9E CE 35V 1000UF 20% RL 1 C6 3130-9270-0 IC 4N29 1 U2 4719-121J-1-X RMF 2W 120R 5% AL METAL 1 R17 471B-120J-1-X RMF 5W 12R 5% AL METAL 2 R28, R29 4840-1760-0 DIODE RECT 1A 200V DB103 1 BR1 4840-2150-0 BRIDGE RECTIFIER 400V 4 BR100, BR101, BR200, BR201 4860-2620-5 TR TIP31C SAMSUNG 1 Q3 5400-0831-0 HEATSINK 1 REF: Q3 5400-1831-1 HEATSINK FOR RECTIFIER 4 REF: BR100, BR101, BR200, BR201 8910-0273-0 POLYSWITCH 0.15 ohm 1.1A 1 R1 8910-0275-0 THERMAL NTC 30A 1 ohm 1 R21 Channel 1 module 153F-154J-5-NLM CM 50V 0.15UF 5% RL 4 C108, C109, C208, C209 153F-223J-5-LQ CM 50V 0.022UF 5% RL 2 C116, C119 153F-224J-5-NLM CM 50V 0.22UF 5% RL 2 C107, C207 153F-332J-5-KW CM 50V 3300pF 5% RL 6x12 2 C172, C179 153H-102J-5-IQ CM 100V 0.001U 5% RL 5X 2 C131, C231 153R-104J-5-YRM CM 250V 0.1u 5% RL 2 C174, C175 153R-152J-5-XQ CM 250V 0.0015UF 5% RL 1 C114 153R-683J-5-WWM CM 250V 0.068u 5% RL 2 C124, C126 157D-107M-5-OUN CE 16V 100UF 20% RL 8X11 2 C125, C225 157D-476M-5-LUN CE 16V 47u 20% RL 6.5X11 2 C106, C206 157E-107M-5-KW CE 25V 100uF 20% RL 6x12 4 C105, C173, C180, C205 157E-226M-5-IUN CE 25V 22uF 20% RL 5X11 1 C129 157E-227M-5-PU CE 25V 220uF 20% RL 4 C112, C113, C212, C213 157Q-106M-5-IU CE 35V 10uF 20% RL 5x11 1 C171 1804-1040-0 SPRING COIL 2uH (14gaWIRE) 1 L100 2101-1991-0 8 PIN IC SOCKET DIP 2 REF: U101, U201 2101-2081-0 26 PIN DUAL ROW IEC 1 J103 2102-130S-003 13 PIN WAFER P2.0 ST. 1 J104 3130-2430-0 IC-NE5532 OPER. AMP PHIL 2 U101, U201 3700-4529-R LED 04mm RED W/STAND 2 LD100, LD200 3700-4530-Y LED 04mm YELLOW W/STAND 2 LD101, LD201 4134-8851-0 FUSE HOLDER (DIA.6.3MM 2 F100 4715-100J-2 RMF 1/4W 10R 5% AT 1 R163 4715-101J-2 RMF 1/4W 100R 5% AT 1 R164 4717-2322-2 RMF 1/2W 23.2K 1% AT 3 R122, R123, R222 4718-123J-2-X RMF 1W 12K 5% AT METAL 2 R177, R194

4718-153J-2-X RMF 1W 15K 5% AT METAL 1 R165 4718-220J-2-P RMF 1W 22R 5% AT FP 2 R136, R137 4718-3R3J-1-X RMF 1W 3.3R 5% AL 3 R146, R147, R20 4719-1R5J-1-X RMF 2W 1R5 5% AL METAL 2 R181, R182 4719-5R6J-1-X RMF 2W 5.6R 5% AL METAL 1 R160 471A-022K-5-N RMF 3W 0.22R 10% RL RGC3 8 R142, R143, R148, R149, R152, R153, R156, R159 471B-120J-1-X RMF 5W 12R 5% AL METAL 4 R154, R155, R161, R162 471B-222J-1-X RMF 5W 2.2K 5% AL METAL 3 R157, R158, R198 471B-512J-1-X RMF 5W 5.1K 5% AL METAL 2 R180, R188 471B-822J-1-X RMF 5W 8.2K 5% AL METAL 4 R118, R119, R133, R135 4750-6200-0 VR V012CPH, D-SHAFT 10K 2 R112, R212 4756-1016-3-06 SVR H6 100R RH0615C 1 R131 4756-2226-3-06 SVR 2.2K H3 7X7.6 R0615C 2 R139, R140 4804-0040-1 DIODE IN4004 AL 4 D10, D12, D117, D118 4804-9340-2 DIODE IN4934 AT 2 D108, D109 4837-3B20-2 DZ 1/2W 3.8-4.0V AT 1 D170 4837-5B10-2 DZ 1/2W 5.5-5.8V AT 2 D107, D110 4838-10V6-2 DZ 1.3W 10V AT TEMIC 1 D174 4838-12V6-2 DZ 1W 12V AT TEMIC 1 D178 4838-15V6-2 DZ 1W 15V AT TEMIC 4 D100, D101, D200, D201 4840-2190-0 DIODE MUR1520 15A 200V 2 D175, D176 4860-5020-5 TR MJE15032 1 Q105 4860-5030-5 TR MJE15033 1 Q106 4860-5050-5 TR 2SC5200 T0-3P (L) 4 Q104, Q108, Q110, Q112 4860-5060-5 TR 2SA1943 T0-3P (L) 4 Q103, Q107, Q109, Q111 4860-5250-5 TR 2N5064 TRIODE 2 D119, D120 490F-Z440-5 FET IRFZ44 TO-220 60V 2 Q170, Q174 5120-0501-0 FUSE T25A/125V 6.4X32MM 1 F100 8910-0274-0 THERMAL PTC 60C 100 ohm 1 R4 8910-0482-0 TRIAC 600V 40A MAC224A8 1 Q113 8910-0488-0 ROD THERMISTOR NTC 50ohm 1 R134 8910-0494-0 CE 63V 12000uF 20% RL 4 C120–C123 Channel 1 SMT parts 150F-101J-J-BD CC 50V 100pF 5% 0805 1.2 1 C130 150F-101K-J-BD CC 50V 100P 10% 0805 1 C132 150F-103M-J-BD CC 50V 0.01uF 20% 0805 1 1 C181 150F-104M-6-CF CC 50V 0.1uF 20% 1206 1. 2 C104, C178 150F-181K-J-BD CC 50V 180P 10% 0805 4 C101, C103, C201, C203 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 1 C115 150F-470J-J-BD CC 50V 47pF 5% 0805 1.2x 5 C110, C170, C176, C177, C210 15CG-270J-6-CF CTC 0/30 27P 5% 1206 2 C111, C211 3130-9240-0 IC LM311M VOLTAGE 2 U170, U171 3131-9730-0 IC NE5517D 1 U10 4720-101J-J RMG 1/10W 100R 5% 0805 6 R109, R110, R127, R209, R210, R227 4720-102J-J RMG 1/10W 1K 5% 0805 3 R102, R126, R202 4720-103A-J RMG 1/10W 10K 1% 0805 8 R100, R101, R105, R106, R200, R201, R205, R206 4720-103J-J RMG 1/10W 10K 5% 0805 3 R103, R128, R203 4720-123J-J RMG 1/10W 12K 5% 0805 1 R176 4720-152J-J RMG 1/10W 1.5K 5% 0805 1 R129 4720-202J-J RMG 1/10W 2K 5% 0805 2 R190, R195 4720-222J-J RMG 1/10W 2.2K 5% 0805 1 R191 4720-243J-J RMG 1/10W 24K 5% 0805 4 R117, R121, R217, R221 4720-271J-J RMG 1/10W 270R 5% 0805 4 R113, R196, R213, R296 4720-3011-J RMG 1/10W 3.01K 1% 0805 2 R24, R175 4720-391J-J RMG 1/10W 390R 5% 0805 2 R120, R220 4720-393J-J RMG 1/10W 39K 5% 0805 2 R107, R207 4720-470J-J RMG 1/10W 47R 5% 0805 2 R170, R189 Channel 1 module (continued) QSC part # Description Qty. Notes or Component Reference

23 4720-472J-J RMG 1/10W 4.7K 5% 0805 8 R114, R138, R174, R179, R187, R193, R214, R238 4720-473J-J RMG 1/10W 47K 5% 0805 1 R183 4720-474J-J RMG 1/10W 470K 5% 0805 2 R172, R185 4720-592A-J RMG 1/10W 5.9K 1% 0805 2 R171, R184 4720-750J-J RMG 1/10W 75R 5% 0805 1 R124 4720-752J-J RMG 1/10W 7.5K 5% 0805 2 R108, R208 4720-821J-J RMG 1/10W 820R 5% 0805 2 R111, R211 4721-101J-6 RMG 1/8W 100R 5% 1206 1 R197 4721-154J-6 RMG 1/8W 150K 5% 1206 6 R104, R173, R178, R186, R192, R204 4721-4643-6 RMG 1/8W 464K 1% 1206 3 R166, R167, R266 4721-473J-6 RMG 1/8W 47K 5% 1206 1 R125 4721-683A-6 RMG 1/8W 68K 1% 1206 4 R22A, R22B, R23A, R23B 4721-821J-6 RMG 1/8W 820R 5% 1206 4 R115, R130, R132, R215 4721-824J-6 RMG 1/8W 820K 5% 1206 2 R116, R216 4804-1480-3 DIODE LL4148 SM 18 D102–D106, D111–D116, D171, D173, D177, D202, D203, D205, D206 4853-9060-3 TR 3906 PNP SM 4 Q100, Q172, Q175, Q200 4860-0640-3 TR 3904 HFE 100-300 SM 4 Q101, Q102, Q171, Q173 Channel 2 module 153F-223J-5-LQ CM 50V 0.022UF 5% RL 2 C216, C219 153F-332J-5-KW CM 50V 3300pF 5% RL 6x12 2 C272, C279 153R-104J-5-YRM CM 250V 0.1u 5% RL 2 C274, C275 153R-152J-5-XQ CM 250V 0.0015UF 5% RL 1 C214 153R-683J-5-WWM CM 250V 0.068u 5% RL 2 C224, C226 157E-107M-5-KW CE 25V 100uF 20% RL 6x12 2 C273, C280 157E-226M-5-IUN CE 25V 22uF 20% RL 5X11 1 C229 157F-476M-5-LU CE 50V 47uF 20% RL 1 C8 157Q-106M-5-IU CE 35V 10uF 20% RL 5x11 1 C271 157R-475M-5-OV CE 250V 4.7u 20% RL 1 C7 1804-1040-0 SPRNG COIL 2uH(14gaWIRE) 1 L200 2102-031S-004 3 PIN ST. WAFER 1 J257 2102-130S-003 13 PIN WAFER P2.0 ST. 1 J204 3700-4531-G LED 04mm GREEN W/STAND 1 LD1 4134-8851-0 FUSE HOLDER (DIA.6.3MM 2 REF: F200 4715-100J-2 RMF 1/4W 10R 5% AT 1 R263 4715-101J-2 RMF 1/4W 100R 5% AT 1 R264 4718-123J-2-X RMF 1W 12K 5% AT METAL 2 R277, R294 4718-153J-2-X RMF 1W 15K 5% AT METAL 1 R265 4718-220J-2-P RMF 1W 22R 5% AT FP 2 R236, R237 4718-3R3J-1-X RMF 1W 3.3R 5% AL 2 R246, R247 4719-1R5J-1-X RMF 2W 1R5 5% AL METAL 2 R281, R282 4719-333J-2-X RMF 2W 33K 5% AT METAL 2 R2, R5 4719-5R6J-1-X RMF 2W 5.6R 5% AL METAL 1 R260 471A-022K-5-N RMF 3W 0.22R 10% RL RGC3 8 R242, R243, R248, R249, R252, R253, R256, R259 471B-120J-1-X RMF 5W 12R 5% AL METAL 4 R254, R255, R261, R262 471B-222J-1-X RMF 5W 2.2K 5% AL METAL 3 R257, R258, R298 471B-512J-1-X RMF 5W 5.1K 5% AL METAL 2 R280, R288 471B-822J-1-X RMF 5W 8.2K 5% AL METAL 4 R218, R219, R233, R235 4756-1016-3-06 SVR H6 100R RH0615C 1 R231 4756-2226-3-06 SVR 2.2K H3 7X7.6 R0615C 2 R239, R240 4804-0040-1 DIODE IN4004 AL 5 D1, D11, D13, D217, D218 4804-9340-2 DIODE IN4934 AT 2 D208, D209 4837-3B20-2 DZ 1/2W 3.8-4.0V AT 1 D270 4837-5B10-2 DZ 1/2W 5.5-5.8V AT 2 D207, D210 4838-10V6-2 DZ 1.3W 10V AT TEMIC 1 D274 4838-12V6-2 DZ 1W 12V AT TEMIC 1 D278 4838-15V6-2 DZ 1W 15V AT TEMIC 2 D8, D15 4840-2190-0 DIODE MUR1520 15A 200V 2 D275, D276 Channel 1 module (continued) QSC part # Description Qty. Notes or Component Reference

4860-5020-5 TR MJE15032 1 Q205 4860-5030-5 TR MJE15033 1 Q206 4860-5050-5 TR 2SC5200 T0-3P (L) 4 Q204, Q208, Q210, Q212 4860-5060-5 TR 2SA1943 T0-3P (L) 4 Q203, Q207, Q209, Q211 4860-5250-5 TR 2N5064 TRIODE 2 D219, D220 4860-8890-0 TR MPS A06 VCE 80V NS 1 Q5 490F-Z440-5 FET IRFZ44 TO-220 60V 2 Q270, Q274 5120-0501-0 FUSE T25A/125V 6.4X32MM 1 F200 8910-0274-0 THERMAL PTC 60C 100 ohm 1 R7 8910-0482-0 TRIAC 600V 40A MAC224A8 1 Q213 8910-0488-0 ROD THERMISTOR NTC 50ohm 1 R234 8910-0494-0 CE 63V 12000uF 20% RL 4 C220–C223 Channel 2 SMT Parts 150F-101K-J-BD CC 50V 100P 10% 0805 1 C9 150F-103M-J-BD CC 50V 0.01uF 20% 0805 1 1 C281 150F-104M-6-CF CC 50V 0.1uF 20% 1206 1. 1 C278 150F-104M-J-BD CC 50V 0.1uF 20% 0805 1. 1 C11 150F-222K-6-CF CC 50V 2200pF 10% 1206 1 1 C215 150F-470J-J-BD CC 50V 47pF 5% 0805 1.2x 3 C270, C276, C277 3130-9240-0 IC LM311M VOLTAGE 2 U270, U271 4720-103J-J RMG 1/10W 10K 5% 0805 1 R228 4720-123J-J RMG 1/10W 12K 5% 0805 1 R276 4720-152J-J RMG 1/10W 1.5K 5% 0805 1 R229 4720-202J-J RMG 1/10W 2K 5% 0805 3 R8, R290, R295 4720-222J-J RMG 1/10W 2.2K 5% 0805 1 R291 4720-3011-J RMG 1/10W 3.01K 1% 0805 1 R275 4720-470J-J RMG 1/10W 47R 5% 0805 3 R25, R270, R289 4720-472J-J RMG 1/10W 4.7K 5% 0805 4 R274, R279, R287, R293 4720-473J-J RMG 1/10W 47K 5% 0805 1 R283 4720-474J-J RMG 1/10W 470K 5% 0805 2 R272, R285 4720-592A-J RMG 1/10W 5.9K 1% 0805 2 R271, R284 4720-750J-J RMG 1/10W 75R 5% 0805 1 R224 4721-101J-6 RMG 1/8W 100R 5% 1206 1 R30 4721-105J-6 RMG 1/8W 1M 5% 1206 2 R3, R6 4721-154J-6 RMG 1/8W 150K 5% 1206 5 R10, R273, R278, R286, R292 4721-224J-6 RMG 1/8W 220K 5% 1206 2 R18, R26 4721-334J-6 RMG 1/8W 330K 5% 1206 1 R27 4721-4643-6 RMG 1/8W 464K 1% 1206 1 R15 4721-473J-6 RMG 1/8W 47K 5% 1206 1 R225 4721-682J-6 RMG 1/8W 6.8K 5% 1206 1 R19 4721-821J-6 RMG 1/8W 820R 5% 1206 2 R230, R232 4804-1480-3 DIODE LL4148 SM 18 D2–D7, D9, D14, D204, D211–D216, D271, D273, D277 4853-9060-3 TR 3906 PNP SM 5 Q4, Q6, Q7, Q272, Q275 4860-0640-3 TR 3904 HFE 100-300 SM 6 Q8, Q9, Q201, Q202, Q271, Q273 4860-5110-3 TR KST42 1 Q1 Input Board 150F-471J-5-OF CC 50V 470pF 5% RL 8x3.5 4 C1, C2, C3, C4 2113-1337-1 XLR FEMALE CONN. 2 J101, J201 2113-1652-0 PHONE JACK 1/4" 6.4 mm 2 J102, J202 5200-4713-0 10 POLE DIP SWITCH 1 SW1 7010-9860-0 26 PIN IEC RIBBON CABLE 1 J1 Output Board 2113-1336-1 SPEAKON NEUTRIK 4 WIRE 2 J100, J200 2113-1338-0 4-POLE SPEAKER TERMINAL 1 J103 4154-2111-0 OUTPUT POST PLUG FOR CE 2 For European models only 4154-2121-0 OUTPUT POST PLUG FOR CE 2 For European models only Channel 2 module (continued) QSC part # Description Qty. Notes or Component Reference

25 DWG NO. PA-002450-00 1 SH REV 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 A B C D A B C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. EFF DATE CHK APPROVED DATE DESCRIPTION REVISIONS REV A XX PARTS LIST AUDIO PRODUCTS, INC. COSTA MESA, CALIFORNIA CHASSIS ASSY RMX 2450 D SCALE1/2 SHEET 1 OF 2 DWG NO. PA-002450-00 REV APPLICATION NEXT ASSY USED ON X RMX 2450 DO NOT SCALE DRAWING FINISH MATERIAL SEE TABULATION BLOCK DATE APPROVALS DRAWN CHECKED ISSUED MILA P. 12-07-2000 UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES. TOLERANCES ARE: DECIMALS DECIMALS ANGLES .xx ± .02 .xxx ± .010 ±1/2 DEBURR EDGES .XXX R MAX TOROID SWITCH SCREW PWR CONNECTOR SCREW 2 REQD NOTES: UNLESS OTHERWISE SPECIFIED THIS DRAWING USED IN CONJUNCTION WITH SCHEMATIC DWGs MAIN PCB SH-002451, INPUT PCB XO, WIRING DIAGRAM SH-002450-00 AND FINAL ASSY PF-002450-00. SCREW 2 REQD FAN GUARD SCREW 4 REQD SCREW 2 REQD SCREW 4 REQD HEX NUT 2 REQD CHASSIS FAN WASHER INPUT PCB OUTPUT PCB FLAT WASHER HEX NUT SCREW 4 REQD SCREW 8 REQD 00 00 00 00 00 00 00 PWR PCB 00 00 00 00 00 RACK EAR 2 REQD 00 00 00 00 00 00 00 00 00 7. Schematics and diagrams 7.1 RMX Assembly/Disassembly Diagram 1 of 2 (All models)

CHASSIS SCREW 4 REQD WIRE ASSY NUT SCREW 5 REQD SCREW 6 REQD KNOB 2 REQD D SCALE1/2 SHEET 2 OF 2 DWG NO. PA-002450-00 REV DWG NO. PA-002450-00 2 SH REV 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 A B C D A B C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. 7.2 RMX Assembly/Disassembly Diagram 2 of 2 (All models)

27 Gray shading indicates signal path NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D QSC AUDIO PRODUCTS. WITHOUT EXPRESS WRITTEN CONSENT FROM BE DISCLOSED, REPRODUCED OR USED OF QSC AUDIO PRODUCTS, THAT MAY NOT INFORMATION WHICH IS THE PROPERTY THIS DOCUMENT CONTAINS PROPRIETARY C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D 2. COMPONENTS WITH VALUE PREFIXED WITH A "^" REPRESENT SMT COMPONENTS. 3. COMPONENTS MARKED WITH ARE SAFETY CRITICAL PARTS. 4. PART NUMBERING SCHEME PARTS IN COMMON TO BOTH CH: 1-99. CH 1 PARTS 101-199, CH 2 PARTS 201-299. 5. J104, J204 ARE CONNECTED PIN TO PIN BY 13-LINE RIBBON CABLE. 1. THIS DRAWING USED IN CONJUNCTION WITH ASSEMBLY WP-000851-00 ! FILTER BYPASS B (8) BRIDGE MONO (6, 7) CLIP LIM B (10) FILTER 30 HZ (9) GND GND CLIP LIM B -IN B +IN B 8 18 SW1:8 7 17 SW1:7 10 20 SW1:10 FILT SEND B (POT) FILT CAP B FILT BYP B 9 19 SW1:9 6 16 SW1:6 GND FILT-BYP A FILT-SEND A 1 11 SW1:1 2 12 SW1:2 3 13 SW1:3 4 14 SW1:4 5 15 SW1:5 BR M SEND (HI-SIG A) BR MONO FEED FILTER 30 HZ (2) CLIP LIM A (1) PARALLEL INPUTS (4, 5) FILTER BYPASS A (3) 16 J203:16 13 J203:13 15 J203:15 14 J203:14 BR_CUT BR_RET BR_BAL 16 J1:16 GND 13 J1:13 14 J1:14 15 J1:15 8 J203:8 9 J203:9 10 J203:10 11 J203:11 12 J203:12 GND 8 J1:8 9 J1:9 10 J1:10 11 J1:11 12 J1:12 BR MONO FEED C102 0.1-50V ^C_1206 10% P1 3 + 8 7 5 1 4 - 2 U10:1 ^U_LM13600 LM13600M 10.0K ^R_0805 R103 C104 .1-50V-10% ^C_1206 11 6 CLIP_B -IN_B +IN_B F_30_B F_SND_B F_BYP_B 23 J1:23 22 J1:22 21 J1:21 20 J1:20 19 J1:19 18 J1:18 17 J1:17 GND 24 J1:24 25 J1:25 26 J1:26 17 J203:17 18 J203:18 19 J203:19 20 J203:20 21 J203:21 22 J203:22 23 J203:23 24 J203:24 25 J203:25 26 J203:26 SEE SH 3 TH_A SEE SH 3 ^C_1206 0.1-50V 10% C100 C105 100-25V P1 R126 1K ^R_0805 A1 -14V R104 150K ^R_1206 R111 270 ^R_0805 10 J104:10 +VCC_A 10 J204:10 R114 4.7K ^R_0805 R107 ^R_0805 39K A1 R117 20.0K ^R_0805 A1 R110 100 ^R_0805 R108 7.50K ^R_0805 R109 100 ^R_0805 Q100 3906 R127 100 ^R_0805 P1 CLIP CH 1 R118 150K ^R_1206 R121 20.0K ^R_0805 C113 220-25V P1 LD100 RED -15V_A D100 15V-1W D103 1N4148 R115 820 ^R_1206 R119 150K ^R_1206 R120 270 ^R_0805 A1 C111 56p-200V-COG ^C_1206 R122 10.0K-1%-1/2W R123 9.09K-1%-1/2W 4 J204:4 4 J104:4 FILT-CAP A 1 3 2 J201 CH2_-IN CH2_+IN GND TIP RING FIVE POSITION BARRIER STRIP CHASSIS_GND 2 J5:2 3 J5:3 1 J5:1 C4 470p 5% ^C_1206 C2 470p 5% ^C_1206 CLIP-LIM A S T R J202 CH1_+IN RING TIP C1 470p 5% ^C_1206 C3 470p 5% ^C_1206 CH1_-IN 5 J5:5 4 J5:4 1 3 2 J101 S T R J102 R102 1K ^R_0805 GND +IN A -IN A 1 J1:1 2 J1:2 3 J1:3 R100 10.0K ^R_0805 R101 10.0K ^R_0805 C101 180p-5% ^C_0805 1 J203:1 2 J203:2 3 J203:3 A1 FILT-BYP A FILT-SEND A FILT-CAP A SW TO GND FOR CLIP LIM 5 J1:5 GND 4 J1:4 6 J1:6 7 J1:7 C103 180p-5% ^C_0805 4 J203:4 5 J203:5 6 J203:6 7 J203:7 26-LINE RIBBON CABLE CONNECTS BREAKAWAY INPUT PCB TO MAIN PCB ROUTE THIS GROUND TO "P" GND AT HEAT SINK COMMON BETWEEN CH A AND CH B ROUTE THIS GROUND TO "A" GND AT JI-2 INPUT CABLE CHANNEL-1 SEE SH 3 10K LINEAR 3B RIGHT ANGLE POT R106 10.0K ^R_0805 C108 .15-5% C109 .15-5% A1 CW CCW W R112 10K C107 .22-5% +14V R113 270 ^R_0805 R116 390K ^R_1206 12 J104:12 13 J204:13 13 J104:13 12 J204:12 R20 6.8-1W A1 P1 C106 10-50NP R105 10.0K ^R_0805 CHANNEL 1 GAIN 3 + 2 - 1 NE5532 U101:1 A1 NC NC NC +15V_A Q101 3904 D104 1N4148 SP_A R125 47K ^R_1206 8 4 5 + 6 - 7 NE5532 U101:2 C114 0.001u, 100V 5% ^C_1206 C110 56p ^C_0805 C112 220-25V P1 D101 15V-1W D102 1N4148 MODEL R116 700 383K 1200 499K R124 47 ^R_0805 C115 0.0022u, 10% ^C_1206 NEG CURRENT LIMIT POS CURRENT LIMIT 1N4934 D109 C117 .0033 1N4934 D108 7 J104:7 D107 5.6V-.25W R130 820 ^R_1206 6 J204:6 6 J104:6 D105 1N4148 D113 1N4148 CW CCW W 2.2K R139 7 J204:7 R128 10K ^R_0805 P1 R129 1.5K ^R_0805 YELLOW LD101 5 J104:5 5 J204:5 FP R136 22-1W SIG CH 1 3904 Q102 1N4148 D112 Q103 2SA1943 R135 2.0K-5W P1 R142 0.22-3W R148 0.22-3W R152 0.22-3W Q107 2SA1943 Q109 2SA1943 D117 1N4004 +67V R146 6.8-1W MJE15032 Q105 C119 .022 P1 D116 1N4148 C120 4700-80V R158 820-5W R157 820-5W 1 REV PROTOTYPE RELEASE 2 CLEAN UP BY AA 3 APPROVED / DATE EFF. DATE CHK REVISION DESCRIPTION 3-01-00 3-10-00 CHANNEL 1 BR-POS E100 L100 2uH R160 5.6-2W WIRES TO BREAK-AWAY SPEAKER OUTPUT PCB SPEAKER OUTPUT PCB SPEAKER CONNECTORS ON BREAK-AWAY PCB. CONTINUED, SHEET 2 +VCC_A JP14 J103 + WP-000850-00 RMX 850 APPROVALS CAD SEED FILE NO. ISSUED CHECKED CONTRACT NO. DRAWN MATERIAL FINISH UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES. DIMENSIONS PER ANSI Y14.5-1982 TOLERANCES ARE: DECIMALS DEBURR EDGES .XXX R MAX .XX +- ANGLES O DECIMALS +- .XXX DO NOT SCALE DRAWING NEXT ASSY USED ON APPLICATION ITEM NO. QTY PART NO. RMX 850 DATE AUDIO PRODUCTS, INC. COSTA MESA, CALIFORNIA SCHEMATIC DIAGRAM RMX850-3.sch DESCRIPTION PARTS LIST VENDOR 3 OF 1 3 PAT QUILTER Thu Sep 07, 2000 FP R137 22-1W 1N4148 D111 R133 2.0K-5W BIAS 50 R134 CW CCW W R131 100 C116 .022 NTC D110 5.6V-.25W C118 .0033 R132 820 ^R_1206 D106 1N4148 D114 1N4148 Q104 2SC5200 CW CCW W R140 2.2K Q108 2SC5200 Q110 2SC5200 R147 6.8-1W MJE15033 Q106 D115 1N4148 C121 4700-80V D118 1N4004 R143 0.22-3W R149 0.22-3W R153 0.22-3W -67V -VCC_A R22 33K ^R_1206 11 J204:11 11 J104:11 SP_A P1 R162 12-5W R161 12-5W P1 2+ 1+ 2- 1- J100 SPEAKON E101 JP13 C124 .068-5% 250V BR-NEG 5-WAY BINDING POST CH A J103 - PLOT DATE: NONE 2-25-00 1 R24 3.3K ^R_0805 P1 BR_BAL SP_B R23 33K ^R_1206 PLOT DATE: 4 SH-000850-00 SH-000850-00 P:RMXQSCRMX850 Thu Sep 07, 2000 1 7.3 RMX 850 Schematic Diagram 1 of 3 Channel 1

Gray shading indicates signal path NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D BR_RET BR MONO RETURN -- CAUTION, SENSITIVE NODE R211 100 ^R_0805 R209 100 ^R_0805 10.0K ^R_0805 R203 SEE SH 1 SEE SH 1 CLIP_B 14 + 9 10 12 16 13 - 15 U10:2 LM13600M R208 7.50K ^R_0805 +14V A1 R204 150K ^R_1206 -14V SW-GND FOR CLIP LIM R210 270 ^R_0805 C205 100-25V R207 ^R_0805 39K SEE SH 3 C211 56p-200V-COG ^C_1206 -15V_B R219 150K ^R_1206 -VCC_B R218 150K ^R_1206 Q200 3906 R215 820 ^R_1206 A1 R220 270 ^R_0805 R222 10.0K-1%-1/2W R214 4.75K ^R_0805 C209 .15-5% C208 .15-5% R217 20.0K ^R_0805 A1 R221 20.0K ^R_0805 8 4 +VCC_B 5 + 6 - 7 NE5532 U201:2 P1 LD200 RED CLIP CH 2 R227 100 ^R_0805 D210 5.6V-.25W C216 .022 CW CCW W R231 100 BIAS D200 15V-1W C213 220-25V P1 D202 1N4148 D205 1N4148 D206 1N4148 D203 1N4148 R232 820 ^R_1206 1N4148 D211 R233 2.0K-5W SEE SH 3 10K LINEAR 3B RIGHT ANGLE POT R206 10.0K ^R_0805 R201 10.0K ^R_0805 R200 10.0K ^R_0805 R205 10.0K ^R_0805 CW CCW W R212 10K A1 R202 1K ^R_0805 F_SND_B F_30_B F_BYP_B +IN_B -IN_B SEE SH 1 SEE SH 1 C201 180p-5% ^C_0805 C203 180p-5% ^C_0805 C206 10-50NP 3 + 2 - 1 NE5532 U201:1 C207 .22-5% A1 R216 390K ^R_1206 C210 56p ^C_0805 +15V_B R213 270 ^R_0805 CHANNEL-2 R228 10K ^R_0805 R229 1.5K ^R_0805 Q201 3904 3904 Q202 D204 1N4148 1N4148 D212 R226 47K ^R_1206 C214 0.001u, 100V 5% ^C_1206 C215 0.0022u, 10% ^C_1206 P1 1N4934 D209 1N4934 D208 D207 5.6V-.25W D201 15V-1W C212 220-25V P1 R224 47 ^R_0805 R230 820 ^R_1206 SIG CH 2 YELLOW LD201 NEG CURRENT LIMIT MJE15032 Q205 C217 .0033 D216 1N4148 D213 1N4148 R246 6.8-1W Q203 2SA1943 Q207 2SA1943 Q209 2SA1943 CW CCW W 2.2K R239 FP R242 0.22-3W R248 0.22-3W R236 22-1W R235 2.0K-5W D217 1N4004 +VCC_B R252 0.22-3W +67V R260 5.6-2W P1 C220 4700-80V R257 820-5W SPEAKER OUTPUT CHANNEL B BR-POS WIRES TO SPEAKER OUTPUT PCB FP R243 0.22-3W R249 0.22-3W Q204 2SC5200 Q208 2SC5200 Q210 2SC5200 R237 22-1W C219 .022 P1 POS CURRENT LIMIT MJE15033 Q206 C218 .0033 50 R234 NTC D215 1N4148 D214 1N4148 R247 6.8-1W CW CCW W R240 2.2K C224 .068-5% L200 2uH R261 12-5W 250V C221 4700-80V R258 820-5W D218 1N4004 P1 -VCC_B R253 0.22-3W SP_B -67V TO CH A SHEET 1 E200 BR-NEG E201 P1 2+ 1+ 2- 1- J200 SPEAKON SPEAKER CONNECTORS ON BREAKAWAY PCB FROM SHEET ONE R262 12-5W JP15 JP16 5-WAY BINDING POST CH B J203 + J203 - NONE OF 2 PLOT DATE: SH-000850-00 SH-000850-00 3 3 3 2 RMX850-3.sch Thu Sep 07, 2000 7.4 RMX 850 Schematic Diagram 2 of 3 Channel 2

29 NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D JP12 - RED BLU WHT BLK WHT AC INPUT, LOW (ALL) TO POWER SWITCH 0V WHT J8A J9A 20 VAC TO FAN POWER RECTIFIER CIRCUIT BREAKER USA: 10A-125V EUROPE: 5A-250V JSW JP10 3 1 2 LINE NEUT GND IEC AC INLET 60C 100 OHM R7 60C 100 OHM R4 28V PRI-SIDE DC FAN SUPPLY 1.1 AMP R1 3 AC1 1 + 2 - 4 AC2 BR1 200V-1A C6 1000-35V MAINTAIN FULL PRI-SEC CREEPAGE 9 J204:9 8 J204:8 8 J104:8 D3 1N4148 D2 1N4148 9 J104:9 TH_A SEE SH 1 ATTACH TO HS-2 ATTACH TO HS-1 TRANSFORMER PRI LEADS - - - - RED BLK BRN GRY GRY RED BRN GRY BLK WHT BLU BLU - BRN 100V 120V 240V AC INPUT, HIGH (ALL) AC VOLTAGE PROGRAMMING TERMINALS 1 OHM 30A R21 U-I CORE POWER TRANSFORMER NOTE SPLIT SECONDARY WIRING FROM EACH LEG TO EACH CHANNEL BRN 120V 20V J3A J7A J5A J4A J2A J6A COIL TWO COIL ONE BLU BLK GRY RED 0V 20V 120V QUICK CONNECT PC-MTD TABS 0.22-200V C227 2 AC1 1 + 4 - 3 AC2 BR200 400V-25A E16 E15 E8 E7 E6 E5 F200 10A-125V RECTIFIERS BR100, 200 AND C127–227 ARE LOCATED OFF THE MAIN PCB, MOUNTED TO CHASSIS. 2 AC1 1 + 4 - 3 AC2 BR100 400V-25A E14 E13 E4 E3 E2 E1 0.22-200V C127 3 J21:3 F100 10A-125V +VCC_A E10 E9 -VCC_A MUTING AND THERMAL PROTECTION. 15K-2W R2 LD1 GRN PILOT LED D1 1N4004 3 J157:3 +VCC_B -VCC_B E11 E12 1.0M ^R_1206 R3 1.0M ^R_1206 R6 R5 15K-2W R26 220K ^R_0805 D15 15V C7 4.7-250V R8 2.0K ^R_0805 Q1 300V-.2A D4 1N4148 D5 1N4148 D7 1N4148 D14 1N4148 R15 470K ^R_1206 MAINTAIN FULL PRI-SEC CREEPAGE R10 150K ^R_1206 C8 47-50V P1 D8 15V R27 220K ^R_1206 P1 MPSW05 Q5 D11 1N4004 Q4 3906 D13 1N4004 D12 1N4004 +14V 2 J204:2 2 J104:2 R18 220K ^R_1206 +15V_B 1 J18:1 + P1 D10 1N4004 D9 1N4148 1 J204:1 1 J104:1 -14V -15V_B R19 6.8K ^R_1206 P1 BR_CUT 3904 Q9 Q8 3904 3906 Q6 Q7 3906 3 J104:3 -15V_A +15V_A R25 47 ^R_0805 .1-5OV C11 BR_CUT 3 J204:3 R17 120-2W Q3 TIP31C R14 6.81K ^R_1206 R9 6.81K ^R_1206 R13 2.0K ^R_0805 1 5 4 2 6 3 4N29 U2 2 J157:2 2 J21:2 1 J157:1 1 J21:1 - 2 J18:2 TO DC FAN D6 1N4148 3 PLOT DATE: OF NONE R12 470K ^R_1206 2500V HI-POT SH-000850-00 SH-000850-00 3 3 ! Thu Sep 07, 2000 3 3 RMX850-3.sch ! ! ! 7.5 RMX 850 Schematic Diagram 3 of 3 Power Supply

Gray shading indicates signal path NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D QSC AUDIO PRODUCTS. WITHOUT EXPRESS WRITTEN CONSENT FROM BE DISCLOSED, REPRODUCED OR USED OF QSC AUDIO PRODUCTS, THAT MAY NOT INFORMATION WHICH IS THE PROPERTY THIS DOCUMENT CONTAINS PROPRIETARY C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D 2. COMPONENTS WITH VALUE PREFIXED WITH A "^" REPRESENT SMT COMPONENTS. 1. THIS DRAWING USED IN CONJUNCTION WITH ASSEMBLY WP-001451-00 3. COMPONENTS MARKED WITH ARE SAFETY CRITICAL PARTS. 4. PART NUMBERING SCHEME PARTS IN COMMON TO BOTH CH: 1-99. CH 1 PARTS 101-199, CH 2 PARTS 201-299. 5. J104, J204 ARE CONNECTED PIN TO PIN BY 13-LINE RIBBON CABLE. 9 19 SW1:9 FILT BYP B FILT CAP B FILT SEND B (POT) 10 20 SW1:10 7 17 SW1:7 8 18 SW1:8 +IN B -IN B CLIP LIM B GND GND FILTER 30 HZ (9) CLIP LIM B (10) BRIDGE MONO (6, 7) FILTER BYPASS B (8) BR MONO FEED BR M SEND (HI-SIG A) 5 15 SW1:5 4 14 SW1:4 3 13 SW1:3 2 12 SW1:2 1 11 SW1:1 FILT-SEND A FILT-BYP A GND 6 16 SW1:6 FILTER 30 HZ (2) CLIP LIM A (1) PARALLEL INPUTS (4, 5) FILTER BYPASS A (3) 15 J1:15 14 J1:14 13 J1:13 GND 16 J1:16 BR_BAL BR_RET BR_CUT 14 J203:14 15 J203:15 13 J203:13 16 J203:16 BR MONO FEED 12 J1:12 11 J1:11 10 J1:10 9 J1:9 8 J1:8 GND 12 J203:12 11 J203:11 10 J203:10 9 J203:9 8 J203:8 P1 10% C102 0.1-50V ^C_1206 11 6 C104 .1-50V-10% ^C_1206 10.0K ^R_0805 R103 3 + 8 7 5 1 4 - 2 U10:1 ^U_LM13600 LM13600M CLIP_B -IN_B +IN_B F_30_B F_SND_B F_BYP_B 23 J1:23 22 J1:22 21 J1:21 20 J1:20 19 J1:19 18 J1:18 17 J1:17 GND 24 J1:24 25 J1:25 26 J1:26 17 J203:17 18 J203:18 19 J203:19 20 J203:20 21 J203:21 22 J203:22 23 J203:23 24 J203:24 25 J203:25 26 J203:26 R111 270 ^R_0805 R104 150K ^R_1206 -14V A1 R126 1K ^R_0805 P1 C105 100-25V ^C_1206 0.1-50V 10% C100 SEE SH 3 TH_A SEE SH 3 Q100 3906 R109 100 ^R_0805 R108 7.50K ^R_0805 R110 100 ^R_0805 A1 R117 20.0K ^R_0805 A1 R107 ^R_0805 39K R114 4.7K ^R_0805 10 J204:10 +VCC_A 10 J104:10 R118 150K ^R_1206 CLIP CH 1 P1 R127 100 ^R_0805 R121 20.0K ^R_0805 C113 220-25V P1 LD100 RED -15V_A D100 15V-1W D103 1N4148 ^R_1206 820 R115 R119 150K ^R_1206 R123 11.3K-1%-1/2W R120 270 ^R_0805 A1 R122 13.3K-1%-1/2W C111 56p-200V-COG ^C_1206 4 J204:4 4 J104:4 FILT-CAP A 1 3 2 J201 CH2_-IN CH2_+IN GND TIP RING FIVE POSITION BARRIER STRIP CHASSIS_GND 2 J5:2 3 J5:3 1 J5:1 C4 470p 5% ^C_1206 C2 470p 5% ^C_1206 CLIP-LIM A S T R J202 C3 470p 5% ^C_1206 C1 470p 5% ^C_1206 TIP RING CH1_+IN CH1_-IN 5 J5:5 4 J5:4 1 3 2 J101 S T R J102 R102 1K ^R_0805 GND +IN A -IN A 1 J1:1 2 J1:2 3 J1:3 R100 10.0K ^R_0805 R101 10.0K ^R_0805 C101 180p-5% ^C_0805 1 J203:1 2 J203:2 3 J203:3 A1 FILT-BYP A FILT-SEND A FILT-CAP A SW TO GND FOR CLIP LIM 5 J1:5 GND 4 J1:4 6 J1:6 7 J1:7 C103 180p-5% ^C_0805 4 J203:4 5 J203:5 6 J203:6 7 J203:7 26-LINE RIBBON CABLE CONNECTS BREAKAWAY INPUT PCB TO MAIN PCB ROUTE THIS GROUND TO "P" GND AT HEAT SINK COMMON BETWEEN CH A AND CH B ROUTE THIS GROUND TO "A" GND AT JI-2 INPUT CABLE CHANNEL-1 R116 500K ^R_1206 R113 270 ^R_0805 +14V C107 .22-5% CW CCW W R112 10K A1 C109 .15-5% C108 .15-5% R106 10.0K ^R_0805 10K LINEAR 3B RIGHT ANGLE POT SEE SH 3 NC NC NC A1 3 + 2 - 1 NE5532 U101:1 CHANNEL 1 GAIN R105 10.0K ^R_0805 C106 10-50NP P1 A1 R20 6.8-1W 12 J204:12 13 J104:13 13 J204:13 12 J104:12 +15V_A Q101 3904 D104 1N4148 SP_A R125 47K ^R_1206 8 4 5 + 6 - 7 NE5532 U101:2 C114 0.001u, 100V 5% ^C_1206 C110 56p ^C_0805 C112 220-25V P1 D101 15V-1W D102 1N4148 MODEL R116 700 383K 1200 499K R124 47 ^R_0805 C115 0.0022u, 10% ^C_1206 NEG CURRENT LIMIT POS CURRENT LIMIT 1N4934 D109 C117 .0033 1N4934 D108 7 J104:7 D107 5.6V-.25W R130 820 ^R_1206 6 J204:6 6 J104:6 D105 1N4148 D113 1N4148 CW CCW W 2.2K R139 7 J204:7 R128 10K ^R_0805 P1 R129 1.5K ^R_0805 YELLOW LD101 5 J104:5 5 J204:5 R135 3.0K-5W FP R136 22-1W SIG CH 1 3904 Q102 1N4148 D112 Q103 2SA1943 +78V P1 D117 1N4004 R142 0.22-3W R148 0.22-3W R152 0.22-3W R156 0.22-3W Q107 2SA1943 Q109 2SA1943 Q111 2SA1943 R146 6.8-1W MJE15032 Q105 C119 .022 P1 C120 3300-100V R157 1K-5W R158 1K-5W D116 1N4148 1 REV PROTOTYPE RELEASE 2 CLEAN UP BY PHQ 4 CLEAN UP BY AA 3 APPROVED / DATE EFF. DATE CHK REVISION DESCRIPTION 3-01-00 3-02-00 3-10-00 CHANNEL 1 BR-POS E100 L100 2uH R160 5.6-2W WIRES TO BREAK-AWAY SPEAKER OUTPUT PCB SPEAKER OUTPUT PCB SPEAKER CONNECTORS ON BREAK-AWAY PCB. CONTINUED, SHEET 2 C122 3300-100V +VCC_A JP14 J103 + RMX 1450 WP-001451-00 APPROVALS CAD SEED FILE NO. ISSUED CHECKED CONTRACT NO. DRAWN MATERIAL FINISH UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES. DIMENSIONS PER ANSI Y14.5-1982 TOLERANCES ARE: DECIMALS DEBURR EDGES .XXX R MAX .XX +- ANGLES O DECIMALS +- .XXX DO NOT SCALE DRAWING NEXT ASSY USED ON APPLICATION ITEM NO. QTY PART NO. RMX 1450 DATE AUDIO PRODUCTS, INC. COSTA MESA, CALIFORNIA SCHEMATIC DIAGRAM RMX1450-4.sch DESCRIPTION PARTS LIST VENDOR 3 OF 1 4 PAT QUILTER Thu Sep 07, 2000 R133 3.0K-5W FP R137 22-1W 1N4148 D111 BIAS 50 R134 CW CCW W R131 100 C116 .022 NTC D110 5.6V-.25W C118 .0033 R132 820 ^R_1206 D106 1N4148 D114 1N4148 Q104 2SC5200 CW CCW W R140 2.2K R147 6.8-1W C121 3300-100V MJE15033 Q106 D115 1N4148 Q108 2SC5200 Q110 2SC5200 Q112 2SC5200 -78V D118 1N4004 R143 0.22-3W R149 0.22-3W R153 0.22-3W R159 0.22-3W -VCC_A R22 33K ^R_1206 11 J204:11 11 J104:11 SP_A P1 C123 3300-100V R162 12-5W R161 12-5W P1 2+ 1+ 2- 1- J100 SPEAKON E101 JP13 C124 .068-5% 250V BR-NEG J103 - 5-WAY BINDING POST CH 1 PLOT DATE: NONE 2-25-00 SH-001451-00 1 SH-001451-00 R24 3.3K ^R_0805 P1 BR_BAL SP_B R23 33K ^R_1206 PLOT DATE: 4 P:GPE PRODUCTS\PRMX-SERIESQSC145 0 1 Thu Sep 07, 2000 ! 7.6 RMX 1450 Schematic Diagram 1 of 3 Channel 1

31 Gray shading indicates signal path NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D BR_RET BR MONO RETURN -- CAUTION, SENSITIVE NODE R211 100 ^R_0805 R209 100 ^R_0805 10.0K ^R_0805 R203 SEE SH 1 SEE SH 1 CLIP_B 14 + 9 10 12 16 13 - 15 U10:2 LM13600M R208 7.50K ^R_0805 +14V A1 R204 150K ^R_1206 -14V SW-GND FOR CLIP LIM R210 270 ^R_0805 C205 100-25V R207 ^R_0805 39K SEE SH 3 R220 270 ^R_0805 A1 R222 13.3K-1%-1/2W R215 820 ^R_1206 Q200 3906 R218 150K ^R_1206 -VCC_B R219 150K ^R_1206 -15V_B C211 56p-200V-COG ^C_1206 5 + 6 - 7 NE5532 U201:2 +VCC_B 8 4 R221 20.0K ^R_0805 A1 R217 20.0K ^R_0805 C208 .15-5% C209 .15-5% R214 4.75K ^R_0805 D210 5.6V-.25W R227 100 ^R_0805 CLIP CH 2 LD200 RED P1 C216 .022 CW CCW W R231 100 BIAS D200 15V-1W C213 220-25V P1 D202 1N4148 D205 1N4148 D206 1N4148 D203 1N4148 R232 820 ^R_1206 R233 3.0K-5W 1N4148 D211 3 + 2 - 1 NE5532 U201:1 C206 10-50NP C203 180p-5% ^C_0805 C201 180p-5% ^C_0805 SEE SH 1 SEE SH 1 -IN_B +IN_B F_BYP_B F_30_B F_SND_B R202 1K ^R_0805 A1 CW CCW W R212 10K R205 10.0K ^R_0805 R200 10.0K ^R_0805 R201 10.0K ^R_0805 R206 10.0K ^R_0805 10K LINEAR 3B RIGHT ANGLE POT SEE SH 3 +15V_B R216 500K ^R_1206 R213 270 ^R_0805 C210 56p ^C_0805 A1 C207 .22-5% R226 47K ^R_1206 1N4148 D212 D204 1N4148 3904 Q202 Q201 3904 R229 1.5K ^R_0805 R228 10K ^R_0805 CHANNEL-2 C214 0.001u, 100V 5% ^C_1206 C215 0.0022u, 10% ^C_1206 P1 1N4934 D209 1N4934 D208 D207 5.6V-.25W D201 15V-1W C212 220-25V P1 R224 47 ^R_0805 R230 820 ^R_1206 SIG CH 2 YELLOW LD201 NEG CURRENT LIMIT MJE15032 Q205 C217 .0033 D216 1N4148 D213 1N4148 R246 6.8-1W Q203 2SA1943 Q207 2SA1943 Q209 2SA1943 CW CCW W 2.2K R239 R235 3.0K-5W FP R242 0.22-3W R248 0.22-3W R236 22-1W +78V D217 1N4004 +VCC_B R252 0.22-3W R256 0.22-3W R260 5.6-2W C220 3300-100V C222 3300-100V P1 R257 1.0K-5W Q211 2SA1943 SPEAKER OUTPUT BR-POS WIRES TO SPEAKER OUTPUT PCB CHANNEL 2 FP R243 0.22-3W R249 0.22-3W Q204 2SC5200 Q208 2SC5200 Q210 2SC5200 R237 22-1W C219 .022 P1 POS CURRENT LIMIT MJE15033 Q206 C218 .0033 50 R234 NTC D215 1N4148 D214 1N4148 R247 6.8-1W CW CCW W R240 2.2K C224 .068-5% L200 2uH R261 12-5W C223 3300-100V C221 3300-100V R258 1.0K-5W 250V D218 1N4004 P1 -VCC_B -78V R253 0.22-3W R259 0.22-3W Q212 2SC5200 SP_B E200 BR-NEG E201 P1 2+ 1+ 2- 1- J200 SPEAKON SPEAKER CONNECTORS ON BREAKAWAY PCB FROM SHEET ONE R262 12-5W JP15 JP16 J203 + J203 - 5-WAY BINDING POST CH 2 TO CH 1 SHEET 1 NONE OF 2 SH-001451-00 SH-001451-00 PLOT DATE: 4 4 Thu Sep 07, 2000 RMX1450-4.sch 2 3 7.7 RMX 1450 Schematic Diagram 2 of 3 Channel 2

! ! ! ! ! ! ! NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D JP12 - RED BLU WHT BLK WHT AC INPUT, LOW (ALL) TO POWER SWITCH CIRCUIT BREAKER USA: 15A-125V EUROPE: 7.5A-250V 0V WHT J8A J9A 20 VAC TO FAN POWER RECTIFIER 3 1 2 LINE NEUT GND IEC AC INLET JSW JP10 ATTACH TO HS-1 60C 100 OHM R7 60C 100 OHM R4 28V PRI-SIDE DC FAN SUPPLY 1.1 AMP R1 3 AC1 1 + 2 - 4 AC2 BR1 200V-1A C6 1000-35V MAINTAIN FULL PRI-SEC CREEPAGE 9 J204:9 8 J204:8 8 J104:8 D3 1N4148 D2 1N4148 9 J104:9 TH_A SEE SH 1 ATTACH TO HS-2 TRANSFORMER PRI LEADS - - - - RED BLK BRN GRY GRY RED BRN GRY BLK WHT BLU BLU - BRN 100V 120V 240V AC INPUT, HIGH (ALL) AC VOLTAGE PROGRAMMING TERMINALS 1 OHM 30A R21 U-I CORE POWER TRANSFORMER NOTE SPLIT SECONDARY WIRING FROM EACH LEG TO EACH CHANNEL BRN 120V 20V J3A J7A J5A J4A J2A J6A COIL TWO COIL ONE BLU BLK GRY RED 0V 20V 120V QUICK CONNECT PC-MTD TABS E5 E6 E7 E8 E15 E16 2 AC1 1 + 4 - 3 AC2 BR200 400V-25A 0.22-200V C227 F200 12A-125V E1 E2 E3 E4 E13 E14 2 AC1 1 + 4 - 3 AC2 BR100 400V-25A RECTIFIERS BR100, 200 AND C127-227 ARE LOCATED OFF THE MAIN PCB, MOUNTED TO CHASSIS. F100 12A-125V 0.22-200V C127 3 J21:3 +VCC_A E10 E9 -VCC_A MUTING AND THERMAL PROTECTION. 15K-2W R2 LD1 GRN PILOT LED D1 1N4004 3 J157:3 +VCC_B -VCC_B E11 E12 1.0M ^R_1206 R3 1.0M ^R_1206 R6 R5 15K-2W R26 220K ^R_0805 D15 15V C7 4.7-250V R8 2.0K ^R_0805 Q1 300V-.2A D4 1N4148 D5 1N4148 D7 1N4148 D14 1N4148 R15 470K ^R_1206 MAINTAIN FULL PRI-SEC CREEPAGE R10 150K ^R_1206 C8 47-50V P1 D8 15V R27 220K ^R_1206 P1 MPSW05 Q5 Q4 3906 D12 1N4004 +14V 2 J204:2 2 J104:2 R18 220K ^R_1206 +15V_B D13 1N4004 1 J18:1 + P1 R19 6.81K ^R_1206 D10 1N4004 D9 1N4148 1 J204:1 1 J104:1 -14V -15V_B D11 1N4004 P1 BR_CUT 3904 Q9 Q8 3904 3906 Q6 Q7 3906 3 J104:3 -15V_A +15V_A R25 47 ^R_0805 BR_CUT 3 J204:3 .1-5OV C11 R17 120-2W Q3 TIP31C R14 6.81K ^R_1206 R9 6.81K ^R_1206 R13 2.0K ^R_0805 1 5 4 2 6 3 4N29 U2 2 J157:2 2 J21:2 1 J157:1 1 J21:1 - 2 J18:2 TO DC FAN D6 1N4148 3 PLOT DATE: SH-001451-00 SH-001451-00 OF NONE R12 470K ^R_1206 4 4 2500V HI-POT RMX1450-4.sch 3 3 Thu Sep 07, 2000 7.8 RMX 1450 Schematic Diagram 3 of 3 Power Supply

33 Gray shading indicates signal path NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D QSC AUDIO PRODUCTS. WITHOUT EXPRESS WRITTEN CONSENT FROM BE DISCLOSED, REPRODUCED OR USED OF QSC AUDIO PRODUCTS, THAT MAY NOT INFORMATION WHICH IS THE PROPERTY THIS DOCUMENT CONTAINS PROPRIETARY C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D 26 J1:26 25 J1:25 26 J2:26 25 J2:25 +IN_B GND +IN B -IN B 24 J1:24 24 J2:24 -IN_B BRIDGE MONO (6, 7) 7 17 SW1:7 FILTER BYPASS B (8) FILTER 30 HZ (9) CLIP LIM B (10) 9 19 SW1:9 10 20 SW1:10 GND CLIP LIM B 8 18 SW1:8 FILT SEND B (POT) FILT CAP B FILT BYP B 5 15 SW1:5 4 14 SW1:4 3 13 SW1:3 2 12 SW1:2 1 11 SW1:1 FILT-SEND A FILT-BYP A GND FILTER 30 HZ (2) FILTER BYPASS A (3) CLIP LIM A (1) PARALLEL INPUTS (4, 5) 6 16 SW1:6 BR MONO FEED BR M SEND (HI-SIG A) 8 J2:8 9 J2:9 10 J2:10 11 J2:11 12 J2:12 GND 8 J1:8 9 J1:9 10 J1:10 11 J1:11 12 J1:12 BR MONO FEED 13 J1:13 13 J2:13 14 J1:14 GND 14 J2:14 BR_RET C132 47P-50V ^C_1206 10.0K ^R_0805 R103 C102 .1-50V-10% ^C_1206 3 + 8 7 5 1 4 - 2 U10:1 LM13600M 11 6 P1 A1 16 J2:16 BR_CUT 15 J2:15 BR_BAL 16 J1:16 15 J1:15 17 J2:17 17 J1:17 18 J2:18 18 J1:18 GND 19 J1:19 20 J1:20 21 J1:21 22 J1:22 23 J1:23 23 J2:23 22 J2:22 21 J2:21 20 J2:20 19 J2:19 F_BYP_B F_SND_B F_30_B CLIP_B -14V C130 100p-50V ^C_1206 R197 100 ^R_0805 A1 A1 A1 C125 100-16NP C105 100-25V R111 820 ^R_0805 R138 4.7K ^R_0805 R104 150K ^R_1206 A1 A1 A1 C131 .001-5% R114 4.7K ^R_0805 R107 ^R_0805 39K R117 24K ^R_0805 R115 820 ^R_1206 C104 .1-50V-10% ^C_1206 R109 100 ^R_0805 R108 7.50K ^R_0805 R110 100 ^R_0805 Q100 3906 ^Q_BJTP_SOT-23 CLIP CH 1 -15V_A R121 24K ^R_0805 R127 100 ^R_0805 D103 1N4148 ^D_SOT-23 D100 15V-1W C113 220-25V LD100 RED P1 SPEAKER BUS -- AFTER FUSE R120 390 ^R_0805 R194 12K-1W R123 23.2K-1%-1/2W R122 23.2K-1%-1/2W R126 1K ^R_0805 R167 464K ^R_1206 R195 2.00K ^R_0805 C179 .0033 1 3 2 J201 FILT-CAP A CH2_+IN CH2_-IN TIP GND RING CHASSIS_GND FIVE POSITION BARRIER STRIP 1 J5:1 3 J5:3 2 J5:2 S T R J202 CLIP-LIM A C2 470p 5% ^C_1206 C4 470p 5% ^C_1206 5 J5:5 4 J5:4 1 3 2 J101 S T R J102 TIP RING CH1_+IN CH1_-IN C1 470p 5% ^C_1206 C3 470p 5% ^C_1206 1 J2:1 2 J2:2 3 J2:3 GND +IN A -IN A 1 J1:1 2 J1:2 3 J1:3 R101 10.0K ^R_0805 R100 10.0K ^R_0805 R102 1K ^R_0805 C101 180p-5% ^C_0805 4 J2:4 FILT-BYP A FILT-SEND A FILT-CAP A SW TO GND FOR CLIP LIM 5 J2:5 6 J2:6 7 J2:7 5 J1:5 GND 4 J1:4 6 J1:6 7 J1:7 C103 180p-5% ^C_0805 A1 26-LINE RIBBON CABLE CONNECTS BREAKAWAY INPUT PCB TO MAIN PCB CHANNEL-1 R173 150K ^R_1206 R178 150K ^R_1206 R190 2.00K ^R_0805 C172 .0033 R177 12K-1W A1 C109 .15-5% C108 .15-5% C107 .22-5% CW CCW W R112 10K R113 274 ^R_0805 R106 10.0K ^R_0805 R116 820K ^R_1206 R196 270 ^R_0805 +14V 10K LINEAR 3B RIGHT ANGLE POT ROUTE THIS GROUND TO "P" GND AT HEAT SINK COMMON BETWEEN CH A AND CH B ROUTE THIS GROUND TO "A" GND AT JI-2 INPUT CABLE CHANNEL 1 GAIN SPEAKER BUS -- BEFORE FUSE R20 3.3-1W R_RES1W R105 10.0K ^R_0805 C111 27p-200V-COG ^C_1206 3 + 2 - 1 NE5532 U101:1 C106 47-10NP A1 A1 P1 +15V_A R166 464K ^R_1206 D104 1N4148 ^D_SOT-23 Q101 3904 ^Q_BJTN_SOT-23 R125 47K ^R_1206 D102 1N4148 ^D_SOT-23 C110 27p ^C_0805 C114 0.0015u, 250V ^C_1206 R124 75 ^R_0805 8 4 5 + 6 - 7 NE5532 U101:2 D101 15V-1W C112 220-25V P1 NEG CURRENT LIMIT POS CURRENT LIMIT D105 1N4148 ^D_SOT-23 C115 0.0022u, 10% ^C_1206 D113 1N4148 ^D_SOT-23 R130 820 ^R_1206 D107 5.6V-.25W D108 1N4934 D109 1N4934 CW CCW W 2.2K R139 ^Q_BJTN_SOT-23 3904 Q102 R128 10K ^R_0805 SIG CH 1 FP +110_A ^D_SOT-23 1N4148 D112 R129 ^R_0805 1.5K YELLOW LD101 0.01 C181 8.2K-5W R118 8.2K-5W R119 Q103 2SA1943 R136 22-1W P1 R156 0.22-3W R181 1.5-2W R152 0.22-3W R148 0.22-3W R142 0.22-3W Q107 2SA1943 Q109 2SA1943 Q111 2SA1943 D117 1N4004 D116 1N4148 ^D_SOT-23 R_RES1W R146 3.3-1W MJE15032 Q105 R198 2.2K-5W C119 .022 P1 P1 10V-1N4740A D174 D170 3.9V 1N4148 ^D_SOT-23 D171 R179 4.7K ^R_0805 R174 4.7K ^R_0805 R172 470K ^R_0805 R171 5.90K ^R_0805 R175 3.01K ^R_0805 2 3 4 V- 1 GND 8 V+ 5 BAL 6 BAL/STR 7 ^LM311-SMT U170 ^U_LM311 .36W at full clip POS STEP DRIVER TO -VMED C170 47pF-50V-5% ^C_0805 ^Q_BJTP_SOT-23 3906 Q172 3904 Q171 ^Q_BJTN_SOT-23 D173 1N4148 ^D_SOT-23 R170 47 ^R_0805 RFZ44 Q170 100-25V C173 C171 10-35V R176 12K ^R_0805 +110_A C120 12000-63V R180 5.1K-5W R164 100-1/4W C129 22-25NP R160 5.6-2W L100 2uH E100 JP14 F100 25A-125V C121 12000-63V SPEAKER CONNECTORS ON BREAK-AWAY PCB. CONTINUED, SHEET 2 SPEAKER OUTPUT PCB CHANNEL 1 SEE SH 3 CT_A J103 + R163 10-1/4W D119 2N5064 R165 15K-1W 2N5064 D120 C174 0.1-250V D175 MUR1520 +55_A DC FAULT PROTECTION MT1 MT2 G Q113 MAC224 P1 BR-POS NEG STEP DRIVER R192 150K ^R_1206 R186 150K ^R_1206 2 3 4 V- 1 GND 8 V+ 5 BAL 6 BAL/STR 7 ^LM311-SMT U171 ^U_LM311 C178 .1-50V-10% ^C_1206 R193 4.7K ^R_0805 R187 4.7K ^R_0805 R185 470K ^R_0805 1N4148 ^D_SOT-23 D177 R191 2.2K ^R_0805 R189 47 ^R_0805 ^Q_BJTN_SOT-23 3904 Q173 Q175 3906 ^Q_BJTP_SOT-23 RFZ44 Q174 C177 47pF-50V-5% ^C_0805 C180 100-25V D178 12V-1W-1N4742A R137 22-1W 8.2K-5W R133 8.2K-5W R135 R183 47K ^R_0805 D111 ^D_SOT-23 1N4148 R184 5.90K ^R_0805 C176 47pF-50V-5% ^C_0805 -110_A FP NTC BIAS D106 1N4148 ^D_SOT-23 R132 820 ^R_1206 D110 5.6V-.25W CW CCW W R131 100 Q104 2SC5200 50 R134 C116 .022 CW CCW W R140 2.2K D114 1N4148 ^D_SOT-23 D115 1N4148 ^D_SOT-23 R147 3.3-1W R_RES1W MJE15033 Q106 Q108 2SC5200 Q110 2SC5200 Q112 2SC5200 D118 1N4004 R157 2.2K-5W R158 2.2K-5W P1 R159 0.22-3W R182 1.5-2W R153 0.22-3W R149 0.22-3W R143 0.22-3W D176 MUR1520 R188 5.1K-5W C123 12000-63V .1-250V C175 R23B 68K ^R_1206 R23A 68K ^R_1206 R22B 68K ^R_1206 R22A 68K ^R_1206 SP_B BR_BAL -55_A R155 12-5W R154 12-5W R162 12-5W R161 12-5W E101 JP13 C122 12000-63V 5-WAY BINDING POST CH 1 WIRES TO BREAK-AWAY SPEAKER OUTPUT PCB J103 - C126 0.068-250V C124 0.068-250V P1 2+ 1+ 2- 1- J100 SPEAKON BR-NEG P1 R24 3.01K ^R_0805 -110_A NONE SH-002451-00 SH-002451-00 PLOT DATE: P:GPE PRODUCTS\PRMX-SERIESQSC245 0 4 4 2 OF Thu Sep 07, 2000 4 2 7.9 RMX 2450 Schematic Diagram 1 of 3 Channel 1

Gray shading indicates signal path NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D BR MONO RETURN -- CAUTION, SENSITIVE NODE BR_RET SEE SH 1 SW-GND FOR CLIP LIM CLIP_B SEE SH 1 4-5 MA CHARGE CURRENT 1 MA DISCHARGE. +14V-A -14V R210 100 ^R_0805 R208 7.50K ^R_0805 10.0K ^R_0805 R203 R209 100 ^R_0805 R296 270 ^R_0805 R204 150K ^R_1206 Q200 3906 ^Q_BJTP_SOT-23 R211 820K ^R_0805 R207 ^R_0805 39K R215 820 ^R_1206 R214 4.7K ^R_0805 A1 A1 A1 14 + 9 10 12 16 13 - 15 U10:2 LM13600M C205 100-25V C231 .001 C208 .15-5% 4 J204:4 4 J104:4 R220 390 ^R_0805 C225 100-16NP R222 23.21K-1%-1/2W 5 + 6 - 7 NE5532 U201:2 C213 220-25V D200 15V-1W LD200 RED C209 .15-5% 8 4 P1 D202 1N4148 ^D_SOT-23 D203 1N4148 ^D_SOT-23 R221 24K ^R_0805 R217 24K ^R_0805 C210 27p ^C_0805 -15V_B CLIP CH 2 NTC BIAS C215 0.0022u, 10% ^C_1206 D214 1N4148 ^D_SOT-23 D205 1N4148 ^D_SOT-23 D206 1N4148 ^D_SOT-23 CW CCW W R231 100 50 R234 C216 .022 D210 5.6V-.25W D209 1N4934 CW CCW W 2.2K R239 CW CCW W R240 2.2K -110_B ^D_SOT-23 1N4148 D211 R227 100 ^R_0805 R232 820 ^R_1206 P1 8.2K-5W R233 8.2K-5W R235 R237 22-1W NEG STEP DRIVER R286 150K ^R_1206 R292 150K ^R_1206 C_MYL2_AI C279 .0033 R295 2.00K ^R_0805 R294 12K-1W R_RES1W C276 47pF-50V-5% ^C_0805 R293 4.7K ^R_0805 R287 4.7K ^R_0805 R283 47K ^R_0805 R285 470K ^R_0805 R238 4.7K ^R_0805 A1 2 3 4 V- 1 GND 8 V+ 5 BAL 6 BAL/STR 7 ^LM311-SMT U271 3 + 2 - 1 NE5532 U201:1 10 J204:10 10 J104:10 C206 47-10NP CW CCW W R212 10K C207 .22-5% A1 A1 C204 180p-5% ^C_0805 C201 180p-5% ^C_0805 R213 274 ^R_0805 R206 10.0K ^R_0805 R201 10.0K ^R_0805 R200 10.0K ^R_0805 R205 10.0K ^R_0805 R202 1K ^R_0805 F_BYP_B 10K LINEAR 3B RIGHT ANGLE POT SW-30 HZ SW-FILT BYPASS F_30_B F_BYP_B +IN_B -IN_B SEE SH 1 SEE SH 1 CHANNEL-2 POS STEP DRIVER R273 150K ^R_1206 R271 5.90K ^R_0805 R274 4.7K ^R_0805 R272 470K ^R_0805 D270 3.9V C272 .0033 D201 15V-1W C212 220-25V 6 J204:6 6 J104:6 P1 75 ^R_0805 R224 C214 ^C_1206 0.0015u, 250V 5% R216 820K ^R_1206 C211 27p-200V-COG ^C_1206 +15V_B R277 12K-1W YELLOW LD201 5 J204:5 5 J104:5 R225 4.7K ^R_1206 R266 464K ^R_1206 R290 2.00K ^R_0805 SPEAKER BUS -- BEFORE FUSE +110_B R278 150K ^R_1206 R228 10K ^R_0805 R229 1.5K ^R_0805 Q201 3904 ^Q_BJTN_SOT-23 1N4148 ^D_SOT-23 D212 R279 4.7K ^R_0805 2 3 4 V- 1 GND 8 V+ 5 BAL 6 BAL/STR 7 ^LM311-SMT U270 8.2K-5W R218 8.2K-5W R219 10V-1N4740A D274 SIG CH 2 FP D204 1N4148 ^D_SOT-23 ^Q_BJTN_SOT-23 3904 Q202 D213 1N4148 ^D_SOT-23 R230 820 ^R_1206 P1 7 J104:7 7 J204:7 D208 1N4934 D207 5.6V-.25W C281 0.01 R236 22-1W FP D216 1N4148 ^D_SOT-23 MJE15032 Q205 R248 0.22-3W R242 0.22-3W R252 0.22-3W R256 0.22-3W Q203 2SA1943 Q207 2SA1943 Q209 2SA1943 Q211 2SA1943 P1 ^Q_BJTP_SOT-23 3906 Q272 C273 100-25V R275 3.01K ^R_0805 R280 5.1K-5W TO -VMED +55_B D275 MUR1520 R281 1.5-2W C274 .1-250V D217 1N4004 C221 12000-63V R265 15K-1W C229 22-25NP +110_B 3904 Q271 ^Q_BJTN_SOT-23 C270 47pF-50V-5% ^C_0805 1N4148 ^D_SOT-23 D271 R270 47 ^R_0805 R276 12K ^R_0805 D273 1N4148 ^D_SOT-23 RFZ44 Q270 C271 10-35V C220 12000-63V DC FAULT PROTECTION MT1 MT2 G Q213 MAC224 R264 100-1/4W R263 10-1/4W D219 2N5064 2N5064 D220 P1 R291 2.2K ^R_0805 1N4148 ^D_SOT-23 D277 C277 47pF-50V-5% ^C_0805 R284 5.90K ^R_0805 ^Q_BJTN_SOT-23 3904 Q273 C278 .1-50V-10% ^C_1206 Q275 3906 ^Q_BJTP_SOT-23 -55_B -110_B R289 47 ^R_0805 C223 12000-63V D278 12V-1W-1N4742A RFZ44 Q274 R288 5.1K-5W C280 100-25V R259 0.22-3W R243 0.22-3W R249 0.22-3W R253 0.22-3W Q204 2SC5200 Q208 2SC5200 Q210 2SC5200 Q212 2SC5200 FP NEG CURRENT LIMIT POS CURRENT LIMIT R246 3.3-1W R_RES1W R247 3.3-1W R_RES1W D215 1N4148 ^D_SOT-23 P1 MJE15033 Q206 C219 .022 R298 2.2K-5W R257 2.2K-5W R258 2.2K-5W CT_B SEE SH 3 C222 12000-63V R260 5.6-2W L200 2uH C224 .068-250V R261 12-5W R254 12-5W F200 25A-125V P1 SP_B D218 1N4004 R282 1.5-2W .1-250V C275 D276 MUR1520 P1 0.068-250V C226 11 J104:11 11 J204:11 SPEAKER OUTPUT BR-POS WIRES TO SPEAKER OUTPUT PCB BR-NEG SPEAKER CONNECTORS ON BREAKAWAY PCB FROM SHEET ONE J203 - J203 + 5-WAY BINDING POST CH 2 CHANNEL 2 TO CH 1 SHEET 1 E200 E201 2+ 1+ 2- 1- J200 SPEAKON R262 12-5W R255 12-5W JP16 JP15 PLOT DATE: NONE SH-002451-00 OF SH-002451-00 4 3 4 4 3 RMX2450-4.sch Thu Sep 07, 2000 7.10 RMX 2450 Schematic Diagram 2 of 3 Channel 2

35 ! ! ! ! NOTES: UNLESS OTHERWISE SPECIFIED A B 8 7 6 5 8 6 7 5 C D QSC AUDIO PRODUCTS. WITHOUT EXPRESS WRITTEN CONSENT FROM BE DISCLOSED, REPRODUCED OR USED OF QSC AUDIO PRODUCTS, THAT MAY NOT INFORMATION WHICH IS THE PROPERTY THIS DOCUMENT CONTAINS PROPRIETARY C D 1 4 3 2 REV SH A 1 DWG NO. B 2 3 4 SIZE FSCM NO. DWG NO. SCALE CAD FILE NO. SHEET REV D JSW TO POWER SWITCH CIRCUIT BREAKER USA: 15A-125V EUROPE: 7.5A-250V JP10 JP12 IEC AC INLET 3 1 2 LINE NEUT GND AC INPUT, LOW (ALL) 20 VAC TO FAN POWER RECTIFIER - BLU BLU WHT BLK RED GRY BLK RED - - - WHT BLK WHT BLU RED - 0V WHT RED 20V J7A J2A J3A COIL TWO GRY J9A J8A J6A 120V COIL ONE E9 E8 E10 E11 E12 1.1 AMP R1 MAINTAIN FULL PRI-SEC CREEPAGE 3 AC1 1 + 2 - 4 AC2 BR1 200V-1A 2 AC1 1 + 4 - 3 AC2 BR200 400V-25A 2 AC1 1 + 4 - 3 AC2 BR201 400V-25A 0.22-250V C227 0.22-250V C228 R29 12-5W CT_A SEE SH 2 -55_B -110_B CT_B E20 E19 E213 E215 D5 1N4148 ^D_SOT-23 D7 1N4148 ^D_SOT-23 D6 1N4148 ^D_SOT-23 D2 1N4148 ^D_SOT-23 R28 12-5W C10 0.047-400V D3 1N4148 ^D_SOT-23 ATTACH TO HS-1 60C 100 OHM R7 ATTACH TO HS-2 60C 100 OHM R4 28V PRI-SIDE DC FAN SUPPLY 8 J104:8 9 J104:9 8 J204:8 9 J204:9 C6 1000-35V AC VOLTAGE PROGRAMMING TERMINALS TRANSFORMER PRI LEADS - BRN GRY BRN GRY BRN 100V 120V 240V AC INPUT, HIGH (ALL) 1 OHM 30A R21 20V BRN J5A J4A 120V 0V BLK E7 E2 E5 E1 QUICK CONNECT PC-MTD TABS U-I CORE POWER TRANSFORMER NOTE SPLIT SECONDARY WIRING FROM EACH LEG TO EACH CHANNEL E3 E6 E4 BLU 2 AC1 1 + 4 - 3 AC2 BR100 400V-25A 0.22-250V C128 2 AC1 1 + 4 - 3 AC2 BR101 400V-25A C127 0.22-250V RECTIFIER BR100-201 CIRCUIT IS DRAWN FOR CHASSIS MTG OF RECTIFIERS. E-POINTS ARE WIRE CONNECTIONS. SEE SH 1 CT_A E13 E14 E114 E112 1 J157:1 MUTING AND THERMAL PROTECTION. +110_A +55_A 1 J21:1 +55_B -110_A -55_A 33K-2W R2 R5 33K-2W +110_B D1 1N4004 PILOT LED E18 E17 E16 E15 E113 E115 E214 E212 LD1 GRN R27 330K ^R_1206 ^R_1206 R3 1.0M ^R_1206 R6 1.0M D4 1N4148 ^D_SOT-23 C8 47-50V D8 15V D15 15V C7 4.7-250V P1 R10 150K ^R_1206 D14 1N4148 ^D_SOT-23 Q1 300V-.2A ^Q_BJTN_SOT-23 +15V_A +14V D11 1N4004 D13 1N4004 .1-5OV C11 D12 1N4004 +15_B -15V_B Q5 MPSA06 1 J104:1 2 J104:2 1 J204:1 2 J204:2 ^Q_BJTP_SOT-23 Q4 3906 R18 220K ^R_1206 D9 1N4148 ^D_SOT-23 R19 6.8K ^R_1206 P1 P1 BR_CUT BR_CUT-A -15V_A +15V_A A1 3 J104:3 12 J104:12 3 J204:3 12 J204:12 13 J204:13 Q8 3904 ^Q_BJTN_SOT-23 3906 Q6 ^Q_BJTP_SOT-23 Q7 3906 ^Q_BJTP_SOT-23 3904 ^Q_BJTN_SOT-23 Q9 R25 47 ^R_0805 C9 ^C_1206 100pF ^R_0805 100 R30 P1 3 J157:3 3 J21:3 1 5 4 2 6 3 4N29 U2 2500V HI-POT R12 470K ^R_1206 2 J157:2 2 J21:2 MAINTAIN FULL PRI-SEC CREEPAGE R15 464K ^R_1206 R26 220K ^R_0805 R8 2.0K ^R_0805 - TO DC FAN 2 J18:2 D10 1N4004 1 J18:1 + 2 PIN HEADER -15V_A -14V R9 6.81K ^R_1206 R14 6.81K ^R_1206 Q3 TIP31C R17 120-2W R13 2.0K ^R_0805 13 J104:13 OF SH-002451-00 SH-002451-00 NONE PLOT DATE: 4 4 4 4 4 RMX2450-4.sch Thu Sep 07, 2000 7.11 RMX 2450 Schematic Diagram 3 of 3 Power Supply

CH 1 SPKR OUTPUT CH 2 SPKR OUTPUT CH 1 SPKR COMMON CH 2 SPKR COMMON J103 J203 OUTPUT PCB 1724-340C-0102 JP14 JP13 JP15 JP16 RED BLK WIRING DIAGRAM, RMX 850 AUDIO PRODUCTS, INC. COSTA MESA, CALIFORNIA SCALENONE REVA SHEET 1 OF 1 NOTES: UNLESS OTHERWISE SPECIFIED REV DESCRIPTION EFF. DATE APPROVED/DATE CHK REVISIONS THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. MAIN PCB 1724-330A-0001 E100 E101 E200 E201 26 CONDUCTOR RIBBON CABLE WITH PIN-TO-PIN INTERCONNECTS J203 1 26 J1 1 26 INPUT PCB 1724-340B-0102 INPUT PCB WIRE ASSY E9 E10 E212 E11 E12 1 2 J18 GRN E112 1 2 3 J128 1 2 FAN ASSY 3-PIN CABLE ASSY 1 2 3 -VCC_B + _B VCC -VCC_A +VCC_A PWR PCB 1724-340A-0102 BRN BRN CIRCUIT- BREAKER AC POWER SWITCH AC POWER CORD BRN GRN BLU HOT GND NEUT TRANSFORMER (1806-2505-0) E1 E2 E3 E4 E5 E6 E7 E8 J3A J6A J3A J7A J7A J9A J9A J9A J7A J8A J5A J4A J4A J4A J8A J2A J2A J2A JP12 JP10 VIO BLU • GRN RED • BRN BLU BLK WHT RED GRY DWG NO. SH-0025000 SH 1 REV A D C B A D C B A 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 120V 230V 100V J21 RED BLK WHI GRY WHI GRY 7.12 RMX 850 Chassis Wiring Diagram

37 CH 1 SPKR OUTPUT CH 2 SPKR OUTPUT CH 1 SPKR COMMON CH 2 SPKR COMMON J103 J203 OUTPUT PCB 1724-340C-0102 JP14 JP13 JP15 JP16 RED BLK WIRING DIAGRAM, RMX 1450 AUDIO PRODUCTS, INC. COSTA MESA, CALIFORNIA SCALENONE REVA SHEET 1 OF 1 NOTES: UNLESS OTHERWISE SPECIFIED REV DESCRIPTION EFF. DATE APPROVED/DATE CHK REVISIONS THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. MAIN PCB 1724-330A-0001 E100 E101 E200 E201 26 CONDUCTOR RIBBON CABLE WITH PIN-TO-PIN INTERCONNECTS J203 1 26 J1 1 26 INPUT PCB 1724-340B-0102 INPUT PCB WIRE ASSY E9 E10 E212 E11 E12 1 2 J18 GRN E112 1 2 3 J128 1 2 FAN ASSY 3-PIN CABLE ASSY 1 2 3 -VCC_B + _B VCC -VCC_A +VCC_A PWR PCB 1724-340A-0102 BRN BRN CIRCUIT- BREAKER AC POWER SWITCH AC POWER CORD BRN GRN BLU HOT GND NEUT TRANSFORMER 1806-2506-0 E1 E2 E3 E4 E5 E6 E7 E8 J3A J6A J3A VIO VIO • J7A J7A J9A J9A J9A J7A J8A J5A J4A J4A J4A J8A J2A J2A J2A JP12 JP10 BLU BLU • GRN RED GRN • BRN BLU BLK WHT RED GRY DWG NO. SH-0025000 SH 1 REV A D C B A D C B A 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 120V 230V 100V J21 RED BLK RED • WHI GRY WHI GRY 7.13 RMX 1450 Chassis Wiring Diagram

CH 1 SPKR OUTPUT CH 2 SPKR OUTPUT CH 1 SPKR COMMON CH 2 SPKR COMMON J103 J203 OUTPUT PCB 1724-342A-0102 JP14 JP13 JP15 JP16 RED 5 RED 4 BLK 3 BLK 2 BLK 1 FG-002450-00 RMX 2450 NEXT ASSY USED ON FIRST APPLICATION UNLESS OTHERWISE SPECIFIED DIMENSIONS ARE IN INCHES WIRING DIAGRAM, RMX 2450 AUDIO PRODUCTS, INC. COSTA MESA, CALIFORNIA PARTS LIST DATE 12-12-00 CHECKED ISSUED DRAWN MILA P. APPROVALS SH-002450-00 DWG NO. SCALENONE REVA SHEET 1 OF 1 DO NOT SCALE DRAWING NOTES: UNLESS OTHERWISE SPECIFIED PRODUCTION RELEASE PER ECO X MP A REV DESCRIPTION EFF. DATE APPROVED/DATE CHK REVISIONS THIS DOCUMENT CONTAINS PROPRIETARY INFORMATION WHICH IS THE PROPERTY OF QSC AUDIO PRODUCTS, THAT MAY NOT BE DISCLOSED, REPRODUCED OR USED WITHOUT EXPRESS WRITTEN CONSENT FROM QSC AUDIO PRODUCTS. MAIN PCB 1724-332A-0003 E100 E101 E200 E201 26 CONDUCTOR RIBBON CABLE WITH PIN-TO-PIN INTERCONNECTS J203 1 26 J1 1 26 INPUT PCB 1724-342A-0102 INPUT PCB WIRE ASSY E112 E114 E113 E115 E116 E217 E212 E214 E213 E215 E216 GRN E117 1 2 3 J257 1 2 FAN ASSY 3-PIN CABLE ASSY 1 2 3 CT_B -55V_B -110V_B +55V_B +110V_B CT_A -55V_A -110V_A +55V_A +110V_A PWR PCB 1724-342A-0102 BRN BRN CIRCUIT- BREAKER AC POWER SWITCH AC POWER CORD BRN GRN BLU HOT GND NEUT TRANSFORMER 1806-2507-0 E1 E2 E3 E7 E8 E9 E4 E5 E6 E10 E11 E12 J5A J9A J5A YEL VIO(2) VIO J7A J7A J3A J3A J3A J7A J2A J8A J6A J6A J6A J2A J4A J4A J4A JP12 JP10 ORG GRN(2) GRN GRY BLU(2) BLU BRN RED(2) RED BRN BLU BLK WHT RED GRY DWG NO. SH-0025000 SH 1 REV A D C B A D C B A 8 7 6 5 4 3 2 1 8 7 6 5 4 3 2 1 120V 230V 100V 1 2 J18 RED 5 RED 4 BLK 3 BLK 2 BLK 1 WHI GRY WHI GRY 7.14 RMX 2450 Chassis Wiring Diagram

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