Apple LaserWriter II SC Service Source

LaserWriter II NTX, LaserWriter IIf, LaserWriter IIg

Product Information The printers covered in this manual are • LaserWriter II SC • LaserWriter II NT • LaserWriter II NTX • LaserWriter IIf • LaserWriter IIg Compatibility: Except for I/O boards components, all parts are compatible among the five models. Refer to Illustrated Parts and Take Apart chapters for more information. Refer to “Print Engine Check” in Flowcharts for Troubleshooting information.

Startup Test Page LaserWriter II printers generate a startup test page approximately 2 – 3 minutes after you switch on the printer. Except for the IISC, the startup test page also shows unit-specific configuration information. The following pages describe each element of the startup test page.

Ê I/O Board Type Printer Name Number of pages the I/O board has produced Configuration PostScript, Diablo 630, or Hewlett Packard LaserJet Plus™ emulation (NTX only) Communication Protocol RS-232 serial or AppleTalk Fonts in ROM Installed RAM Size of hard drive, if connected, and number of fonts it contains (NTX only) Version of ROM installed II NT/NTX Startup Test Page

I/O Board Type Printer Name Number of pages the I/O board has produced Fonts in ROM Installed RAM Version of ROM installed IIf Startup Test Page Communication parameters and printer control language selected for an individual printer port FinePrint feature enabled

I/O Board Type Printer Name Number of pages the I/O board has produced Fonts in ROM Installed RAM Version of ROM installed IIg Startup Test Page Communication parameters and printer control language selected for an individual printer port FinePrint feature enabled

IISC Startup Test Page The LaserWriter IISC test page consists only of vertical lines. The printer will generate a test page only if its SCSI address has been set to 7 prior to powering up. Note: Be sure to set the SCSI address back before you resume printing.

Service Test Page The service test page is generated by the DC controller board and serves to confirm print engine operation. To generate this test page, remove the bottom panel cap located at the rear of the printer. Insert a screwdriver or similar dowel-shaped tool through the quarter inch diameter opening and press the service test page button.

Preventive Maintenance Before performing any preventive maintenance, be sure to do the following: 1 Check the page count on the startup test. If the I/O board has been replaced or upgraded, check the repair log label affixed to the bottom of the printer or consult with the customer to determine page count. 2 Power off and unplug the printer. 3 Allow the fuser assembly rollers to cool. 4 Prepare your work area for electrostatic discharge prevention. 5 Spread a drop cloth under the work area to protect the floor from grease and spilled toner. Caution: Never use an ammonia-based cleaner on the

LaserWriter II. These cleaners can discolor the plastic. Caution: Before servicing the fuser rollers, make sure that the printer has been off at least 5 minutes to allow the fuser assembly to cool. The service provider should clean the following items every 12 months or during each service call. Service Point Tool/Solvent Primary corona wire Cleaning brush supplied with printer Transfer corona wire Cotton swab and isopropyl alcohol Transfer guide Cloth dampened with water Fuser rollers Fuser cleaning pad

Exterior case Cloth dampened with water Separation claws Cloth dampened with alcohol Paper guide Cloth dampened with alcohol Lower delivery guide Cloth dampened with alcohol Feeder guide Cloth dampened with water Registration rollers Cloth dampened with water Service Point Tool/Solvent

Parts Replacement Schedule Perform the following tasks every 50,000 prints: • Replace the ozone filter • Check upper and lower fan operation. Replace the following parts every 100,000 prints: • Fuser assembly • Transfer guide assembly • Preconditioning exposure assembly • Paper feed roller assembly • Transfer corona assembly The LaserWriter II refurbishment kit (P/N 652-0597) contains one each of the parts listed above.

General Engine Canon SX engine Printing Method Electrophotography using single-component, dry toner Optical System Semiconductor laser and a rotating six-faced prism scanning mirror Resolution 300 dpi Imaging Languages Supported SC: QuickDraw NT: PostScript and a subset of the Diablo 630 printer NTX/NTX-J: PostScript, a subset of the Diablo 630 printer, and a subset of the Hewlett-Packard LaserJet Plus

f/g: PostScript Level 1 and 2 and HP LaserJet IIP (HP PCL4) Note: NTX-J does not support emulation mode.

Logic Board CPU SC: Motorola 68000 microprocessor (7.45 MHz) NT: Motorola 68000 microprocessor (11.16 MHz) NTX/NTX-J: Motorola 68020 microprocessor (16.67 MHz) f: Motorola 68030 microprocessor (20.0 MHz) g: Motorola 68030 microprocessor (25.0 MHz) DRAM SC: 1 MB NT: 2 MB NTX: 2 MB, expandable to 12 MB NTX-J: 4 MB, expandable to 12 MB f: 2 MB/5MB, expandable to 32 MB g: 5 MB/8MB, expandable to 32 MB Ê

ROM SC: 16 KB NT: 1 MB NTX/NTX-J: 1 MB, expandable to 8 MB on expansion board f: 2 MB standard; ROM expansion slot provided g: 2 MB standard; ROM expansion slot provided I/O SC: SCSI, Apple Desktop Bus (ADB) NT: RS-232/422, LocalTalk, ADB NTX/NTX-J: RS-232/422, LocalTalk, SCSI, ADB f: RS-232/422; LocalTalk; SCSI g: RS-232/422; LocalTalk; SCSI; Ethernet

Performance Printing Speed 8 pages per minute (all paper sizes except legal) 7 pages per minute (legal size) Note: Actual performance depends on the application. Duty Cycle No limit in pages per month Minimum Life Expectancy 300,000 pages Major Service Interval 100,000 copies Ê

Printable Area All measurements are in inches: SC US Letter : 8.00 by 10.60 Legal: 6.72 by 12.50 A4: 8.00 by 11.27 B5: 6.67 by 9.43 #10 Envelopes: 3.84 by 9.10 NT, NTX, and NTX-J US Letter : 8.00 by 10.78 Legal: 8.00 by 13.78 A4: 7.79 by 11.08 B5: 6.45 by 9.76 #10 Envelopes: 3.84 by 9.10

IIf Ê US Letter : 8.11 by 10.79 Legal: 8.00 by 10.78 (Maximum printable area with 2 MB of RAM. Prints up to 8.00 x 13.78 with 5 MB of RAM. Prints up to 8.00 x 13.78 using PhotoGrade with 8 MB of RAM.) A4: 7.89 by 11.44 B5: 6.72 by 9.81 #10 Envelopes: 3.84 by 9.10 IIg US Letter : 8.11 by 10.79 Legal: 8.11 by 13.79 (Legal-size documents require 8 MB of RAM to print with PhotoGrade.) A4: 7.89 by 11.44 B5: 6.72 by 9.81 #10 Envelopes: 3.84 by 9.10

Paper Paper Weights Cassette feed:16-24 lb., single-sheet, photocopy bond Manual feed:16-36 lb., letterhead and colored stock, standard- weight transparency material, envelopes, and labels Cassette Sizes US letter standard; legal, A4, B5, and envelope cassettes optional Cassette:200 sheets Manual: single sheets Envelope cassette:15 envelopes Face-down tray:100 sheets Face-up tray:20 sheets Capacity In Use manual feed for letterhead, colored stock, standard-weight transparency material, and labels.

Built-In Fonts SC Times, Helvetica, Courier, and Symbol NT, NTX, NTX-J Times, Helvetica, Helvetica Narrow, Courier, Symbol, Palatino, ITC Avant Garde, ITC Bookman, New Century Schoolbook, ITC Zapf Chancery, and ITC Zapf Dingbats IIf, IIg Times, Helvetica, Helvetica Narrow, Courier, Symbol, Palatino, ITC Avant Garde, ITC Bookman, New Century Schoolbook, ITC Zapf Chancery, ITC Zapf Dingbats, and Emulator. Note: Built-in fonts can be expanded using an optional font expansion board. All LaserWriter II printers support TrueType when using LaserWriter driver 6.1 or greater.

Environmental Temperature Operating: 50–90.5°F (10–33°C) Storage:38–95° F (3–35°C) Humidity Operating: 20-80% relative humidity Storage: 10-80% relative humidity Printing: Under 60 dB(A) Standby: Under 50 dB(A)

Electrical Line Voltage US/Japan:100-115 V, 50-60 Hz Europe/Australia:220-240 V, 50 Hz Power Consumption Standby: 170 W (average) Operating: 900 W maximum (115 V) 780 W maximum (220 V) 880 W maximum (240 V)

Physical Dimensions Width: 20 in. (51 cm) Depth: 18.9 in. (48 cm) Height: 8.5 in. (21.6 cm) Weight 46 lb. (21 kg)

IIf/IIg Diagnostic Set the rotary switch on the back of the printer to 4 and connect the LaserWriter II Test Connector to the DB-25 serial port (or simply jumper pins 4 and 22). Switch on the printer. Under normal conditions, LEDs should flash during startup, and then fix on the “diagnostic executing” configuration for about 2 minutes. If no error is found, all LEDs flash and a page prints. If the LEDs indicate an error, go to the appropriate topic in Flowcharts. After running this diagnostic, switch off the printer, remove the Test Connector, and reset the rotary switch to its original setting. (No Error Found) (Diagnostic Executing) Fuser Assembly Error Laser/Scanner Error I/O Controller Board Error Replace ROM #1 Replace ROM #2 Replace SIMM #2 Replace SIMM #3 Replace SIMM #4 Replace SIMM #5 Replace SIMM #6 Replace ROM #3 Replace ROM #4 Replace SIMM #1 Replace SIMM #6 Replace SIMM #7 Replace SIMM #8

Capacitor Discharge When there is a failure of the fusing system, the DC controller board shuts off current to the fuser roller heater and charges capacitor C211 to prevent overheating. If there is a failure of the fusing system, you must turn the power off for about 30 minutes or manually discharge the capacitor before switching power back on. C211 DC Controller Board

Switch off and unplug the printer, and remove the bottom panel and lower cover. Locate capacitor C211 on the DC controller board. Carefully jumper the two wires at the base of the capacitor using some kind of conductive tool, as shown on the next page. Caution: Take care not to damage the board tracings or the components neighboring the capacitor. Note: There are many different tools that can be used to discharge the capacitor: a flat blade screwdriver, paper clip, or aluminum foil doubled over. The tool illustrated is a length of lead solder. It has the advantage of being ductile and is less apt to damage the controller board.

Controller Board Readings Voltage readings on the Canon SX engine controller board are difficult to make and require accessing the underside of the printer. Rest the printer on the I/O board rails with the rear side facing you and the near rail at the front edge of your work surface. If you need to elevate the printer to get clearer access to the DC controller board, use the bottom panel and lower cover. Caution: The printer must be in an upright position during a print cycle or while the clamshell is open.

Roller Diameters Repetitive printing defects can often be isolated by measuring the tracking left by rollers. On the next page is a diagram that shows all the rollers in the LaserWriter II that come into contact with paper. The dimension given is the distance between tracks.

Transfer Guide Assembly .5" (13 mm): roller to corona assy 1.5" (38 mm): upper metallic roller 1.75" (44 mm): lower black roller Fuser Assembly 2.56" (65 mm): lower fuser roller 3.16" (80 mm): upper fuser roller Toner Cartridge 2.0" (51 mm): developer roller 3.75" (95 mm): photosensitive drum

Drum Check Interrupting a print cycle and inspecting the photosensitive drum can help isolate the cause of print quality problems. If the image on the surface of the drum exhibits the same problem as the printed page, the fault is before the drum, probably somewhere in the scanning system. If the image on the drum is okay, the fault is after the drum, probably in the fuser assembly, transfer corona, or high-voltage power supply. Note: Refer to “Roller Diameters” in this chapter for further quick-check troubleshooting tips.

Top-Cover Interlock Defeating the top-cover interlock simulates a clamshell-shut condition and is required in certain troubleshooting procedures. You defeat this interlock by lodging a stiff, non-metallic insert into the interlock switch. A plastic ball-point pen cap or folded index card works well.

Circuit Board Diagrams On the following pages are diagrams of the circuit boards and high-voltage contacts listed below: • LaserWriter IISC I/O board • LaserWriter IINT I/O board • LaserWriter IINTX I/O board • LaserWriter IIf I/O board • LaserWriter IIg board • DC controller board • Distribution board • High-voltage contact • Fuser board

LaserWriter IINT I/O Board ADB DIP Switches RS-232 RS-422 LocalTalk ROMs

LaserWriter IINTX I/O Board ADB DIP Switches RS-232 RS-422 LocalTalk ROMs SCSI

LaserWriter IIf I/O Board RS-232 ROMs SCSI SIMMs Pushbutton Switch RS-422 LocalTalk

LocalTalk LaserWriter IIg I/O Board ROMs SIMMs RS-422 RS-232 SCSI Ethernet Pushbutton Switch

J201 J203 J202 J212 J213 LED201 J210 J209 J208 J207 J206 J205 Service Test Page Button (see “Service Test Page” in Basics) Cover Interlock Switch C211 (see “Capacitor Discharge” in Troubleshooting.) Cassette Microswitches DC Controller Board

Drum Sensitivity Switch SW301 Drum Sensitivity Switch SW302 DC Power Supply Registration Clutch Solenoid SL302 Paper Pickup Roller Solenoid SL302 Paper-Out Sensor PS301 Manual-Feed Paper Sensor PS302 Distribution Board J213 Distribution Board

Primary Corona Wire Contact Silver-Colored Screw Primary Corona Grid Contact Transfer Corona Contacts (Underneath) Developing Bias Contact Low Toner Sensor Contact Toner Cartridge Ground High-Voltage Contacts

Delivery Sensor PS331 (opposite face) Delivery Sensing Lever To Thermistor TH1 Preconditioning Exposure Assembly Contacts J333 J334 7 1 J331 Fuser Board (also known as Fuser PCA)

Connector Locators On the following pages are diagrams of the connectors listed below: • Connector J103 • Connector J502 • Connector J601

Connector J103 connects the fuser to the fuser safety PCA inside the power supply block. If you measure continuity between the two pins of J103, the fuser bulb and thermoprotector are intact. Fuser Assembly (Removed from Printer) J103 J103

Connector J502 connects the DC power supply with the power supply block. This illustration shows the printer with the DC power supply removed. J502-1 J502-3 J502

Connector J601 connects the high-voltage power supply to J211 on the DC controller board. This illustration shows the printer with the high-voltage power supply removed. J601-1 J601-8 J601

Flowcharts The flowcharts for this manual are contained in an interactive file called “LaserWriter II Flowcharts.” This file has been derived from the original version of Service Source but is a standalone self-launching application. To launch this file, click the button below..

Main Motor J201 Optical Fiber J3 F1 +24VDC Top Cover Interlock AC-COLD AC-HOT 1 1 3 3 J502 J104 Noise Filter CB1 J152 1 2 +24VDC J103 1 2 Fuser Safety PCA FAN (SB) FSRD* (PK) GND (BL) +24VA (R) 1 2 3 4 J101 +5V(BR) PDP*(SB) GND(BL)5V FSRTH(PK) PEXP(Y) GND 24V(BL) +24V (R) 7 6 5 4 3 2 1 7 6 5 4 3 2 1 1 2 3 4 J208 J206 HEATER BULB TP1 2 1 TH1 J332 Paper Delivery Sensor PS331 Precon- ditioning Exposure Circuit J334 J333 +24V TB 322 TB 321 MPFS* 9 PEMP* 8 +5V 7 GND 6 +24V 5 CPUD 4 REGD 3 CSENS2* 2 CSENS1* 1 +24B(R) 8 GND(BL) 7 DBDC*(V) 6 TSENS(Y) 5 DBAC*(V) 4 HV10N(GY) 3 J213 J211 PS302 Manual- Feed Paper Sensor PS301 Paper Out 9 8 7 6 5 4 3 2 1 GND GND +5V +5V +24V GND Pickup Roller Solenoid SL301 +24V Regis- tration Solenoid SL302 Drum- Sensitivity Switches SW302 SW301 GND 8 7 6 5 4 3 TB 604 TB 605 TB 603 Primary Corona Discharging Pins J601 Connector PCA DC Controller PCA Laser/Scanner Assembly DC Power Supply Power Supply Block Fuser Assembly Thermo-Protector Fuser PCA Preconditioning Exposure Assy Distribution PCA Ton TEMPL* JAML* +5V J331 4 5 1 2 3 +2 J331 Upper Fan Connector PCA RDYL* POUT* J210

I/O Board No preliminary steps are required before you begin this procedure. Note: The I/O board may require configuration prior to installation in the the printer. For more information, refer to “I/O Board Installation” in Additional Procedures. Note: If the I/O board is removed from the printer, the LEDs no longer function. I/O Board

1 Loosen the two screws that secure the I/O board to the chassis. 2 Caution: Handle the board by the metal bracket only. Carefully slide the I/O board out of the printer. I/O Board

Base Unit Before you begin, remove the I/O board. Note: This procedure covers the take apart of the bottom panel, I/O board shield plate, lower cover, and the lower fan. Caution: Always remember to remove the toner cartridge prior to turning the printer over. Ê Lower Fan Lower Cover I/O Board Shield Plate Bottom Panel

1 Place the printer on its back on a padded work surface. 2 Remove the seven screws that secure the bottom panel to the metallic lower cover. 3 Remove the bottom panel. Bottom Panel

4 Remove the two screws that secure the I/O board shield plate to the lower cover. Remove the shield plate. I/O Board Shield Plate

5 Remove the nine screws that secure the lower cover to the printer chassis. 6 Lift the lower cover and slide it free at the I/O board guide rails. Lower Cover

Lower Fan Note: If you need to remove the lower fan, perform the following procedure. 1 Disconnect the fan cable from DC controller board connector J207. 2 Remove the four screws that secure the fan to the chassis. 3 Remove the fan and the fan bracket. Lower Fan

Controller Boards Before you begin, remove the following: • I/O board • Base unit Note: This topic covers the take apart of the DC controller board and the connector board. You may perform these procedures in any order. Neither procedure requires that the other be done first. DC Controller Board Connector Board

DC Controller Board 1 Remove the two screws that secure the I/O board guide rail to the chassis and move the guide rail away from the DC controller board. DC Controller Board I/O Board Guide Rail

Note: Cabling is not shown for clarity. 2 Remove the two screws that secure the DC power supply and distribution board connectors. 3 Loosen the screw that secures the lower- cover interlock switch actuator to the chassis and lift off the metal actuator. Cover Interlock Switch Actuator DC Power Supply Connector J212 Distribution Board Connector J213

4 Disconnect the following cables: • Fuser assembly board cable from J206 • Lower fan cable from J207 • Power supply block cable from J208 • High-voltage power supply cable from J211 • Scanning motor assembly cable from J203 • Laser diode assembly cable from J202 • Optical fiber cable from J201

5 Remove the two screws that secure the power lugs to the connector board. 6 Remove the four screws that secure the DC controller board to the chassis. Power Lugs

7 Note: The two DC power supply connectors offer some resistance when you are removing the DC controller board. If you want to alleviate this problem, remove the four screws that secure the connector to the board, remove the cables from the connector, and then proceed with removing the board. Be sure that you screw the connector back in before returning the controller board to Apple.

Carefully grasp the DC controller board by the edges and pull the board firmly up and away from the connector board. 8 Remove the jumper at J209, if one is present. Jumper

Connector Board 1 Disconnect the status panel cable from connector J331. 2 Remove the two screws that secure the power lugs to the connector board. 3 Remove the three screws that secure the connector board to the chassis. Power Lugs Connector Board

4 Remove the screw at the corner of the DC controller board nearest the power lugs. 5 Lift the corner of the DC controller board slightly and slide out the connector board. Connector Board Screw

Cover Set No preliminary steps are required before you begin this procedure. Note: This procedure covers the take apart of the cover set, including the release button and LED status panel Cover Set

2 Depress the release button and open the top cover. 3 Remove the three interior screws along the rim of the cover set. Release Button

4 Remove the two interior screws that secure the cover set bracket to the chassis.

5 Note: If you need to monitor status panel lights when the cover is off, don’t disconnect the connector. Simply remove the two screws and lift the whole status panel off the cover. Lift up the cover set and remove it far enough to disconnect the connector from the LED status panel. LED Status Panel

6 Set aside the cover set. Note: The cover set is made up of front, rear, upper right, and lower right panels. Each panel can be taken apart by removing the appropriate screws. Release Button 1 To remove the release button, squeeze the arms of the button and remove it from the upper right panel. Release Button

Clamshell Detachment Before you begin, remove the following: • Cover set • Fuser assembly Note: The clamshell is what hinges upward when you open the printer. It is not available from Apple as an assembly, but you may need to remove it in the course of removing other assemblies. Clamshell

1 Remove the four screws that secure the left and right hinge assemblies to the chassis and lift off the upper clamshell (right hinge assembly not shown). Replacement Note: Cradle the clamshell in an upright position and secure the right hinge assembly to the printer chassis. Then secure the left hinge assembly. Make sure the screws are tight. Left Hinge Assembly

Laser/Scanner Assembly Before you begin, remove the cover set. Note: The LaserWriter II laser/scanner assembly is available only as an integral assembly. No subcomponent is available from Apple and no adjustments to laser power circuitry can be made. See “Laser Power Output Check” under Additional Procedures for measurement procedures. Laser/Scanner Assembly

1 Disconnect the cable from laser diode board connector J451.

2 Open the cover that accesses the scanning motor board and disconnect the scanning motor cable. Cover Scanning Motor Cable

3 Remove the screw on the optical fiber cover and open the cover. 4 Carefully lift the optical fiber cable up and out of its slot in the laser/ scanner assembly. Replacement Note: Make sure that the collar on the optical fiber seats properly in the slot before closing the cover. Optical Fiber Cable Cover

5 Remove the four long screws that secure the laser/scanner assembly to the main body block. 6 Remove the laser/ scanner assembly. Note: Make sure that the optical fiber and laser harness cables are removed when you return a defective laser/scanner assembly to Apple.

Fuser Assembly No preliminary steps are required before you begin this procedure. Note: The fuser assembly consists of several orderable components and sub- assemblies (see Illustrated Parts). Fuser Assembly

Note: This procedure covers only the removal of the fuser assembly from the printer. The topics that follow this one address further disassembly of the fuser assembly: • Fuser Delivery Assembly • Fuser Heater Bulb • Delivery-Sensing Lever 1 Depress the release button and open the top cover.

2 Remove the four screws that secure the fuser assembly to the chassis. 3 Lift the fuser straight up out of the printer. Replacement Note: Make sure that the 7-pin connector on the fuser board mates properly with the receptacle. Note: Before returning the fuser assembly to Apple, remove the cleaning felt and replace it with the roller separators that come with the exchange unit. Fuser Board Fuser Assembly

Fuser Delivery Assembly Before you begin, remove the fuser assembly. Note: The fuser delivery assembly is an orderable subassembly of the fuser assembly. Its function is to separate the page as it exits the fuser rollers and to feed it toward the delivery tray. Fuser Delivery Assy

1 Open the fuser delivery assembly. 2 Unhook the two tension springs that connect the fuser delivery assembly to the fuser assembly. 3 Remove the two screws that secure the fuser delivery assembly to the fuser assembly. 4 Remove the fuser delivery assembly. Tension Spring Fuser Delivery Assembly

Delivery Rollers Note: The delivery rollers are the white serrated rollers within the fuser delivery assembly. 1 If you need to replace a delivery roller, remove the three C-rings that secure the delivery roller shaft to the fuser delivery assembly. C-Rings C-Ring

2 Push the bushings toward the center of the delivery roller shaft. Delivery Roller Shaft Bushing Bushing

3 Note: Be careful not to lose the tiny delivery roller gear pin that falls out when you remove the gear in the following step. Slide the delivery roller shaft away from the gear arm and rotate the gear arm off the shaft. Delivery Roller Shaft

4 Remove the delivery roller gear from the delivery roller shaft. Delivery Roller Gear

5 Note: The delivery rollers rest loosely within slots in the fuser delivery assembly and may fall out when you remove the roller shaft. Remove the delivery roller shaft and lift out the delivery roller. Delivery Rollers

Fuser Heater Bulb Before you begin, remove the fuser assembly. Note: The fuser heater bulb is an orderable sub- component of the fuser assembly. It provides the heat necessary to fuse toner to paper. Fuser Heater Bulb

1 Open the fuser delivery assembly. 2 Loosen the screw (1) that secures the fuser cover to the fuser assembly. 3 Lift the fuser cover and the fuser cleaning felt. 4 Remove the screw (2) that secures the left contact cap to the fuser assembly. Lift off the cap. Left Contact Cap Fuser Cover Cleaning Felt (Inside)

5 Remove the two screws that secure the fuser board to the fuser assembly. 6 Note: The fuser board will hang loosely from the fuser assembly after the following step. Be careful when handling either part. Detach the fuser board from the fuser assembly.

7 Remove the three screws that secure the left terminal mount to the fuser assembly. 8 Remove the terminal mount. Left Terminal Mount

9 Remove the screw that secures the left heater support to the fuser assembly. Remove the support. Left Heater Support

10 Remove the screw that secures the right contact cap to the fuser assembly. Remove the cap. Replacement Note: Before replacing the contact cap, make sure that the heater bulb grounding lead wraps around the positioning posts on top of the terminal mount. Right Contact Cap