Daewoo K-MECHA DECK Technical Service Manual

2. ASSEMBLY DIAGRAM & MAJOR PARTS CHECK..............................................................5 3. DISASSEMBLY AND REPLACEMENT................................................................................12 4. MECHANICAL ADJUSTMENT..............................................................................................22 5. ADJUSTMENT OF TAPE TRANSPORTING SYSTEM.......................................................27 6. EXPLODED VIEW AND PARTS LIST....................................................................................37

2) K-MECHA DECK uses three motors (DRUM MOTOR, CAPSTAN MOTOR and L/C MOTOR) 3) K-MECHA DECK uses L/C MOTOR to drive FRONT LOADING. 4) K-MECHA DECK recognizes each mode by using a 4-BIT MODE signal. This 4-BIT MODE signal is generated by the CAM SWITCH which is driven by the L/C MOTOR. 5) K-MECHA DECK is operated by 7 MODES (EJECT/INITIAL/REV/IDLE/PLAY, STOP, SLOW/BRAKE/FF & REW). 6) K-MECHA DECK reduces the mode shifting time, that is, picture playing time by using the FULL LOADING SYSTEM that has the DRUM wrapped by the tape. 7) K-MECHA DECK is seperated from the Main PCB. When assembling, it is connected by B-B TYPE CONNECTOR. The CAPSTAN MOTOR and DRUM MOTOR of K-MECHA DECK and the MAIN PCB DECK are directly connected without using cable. 1. DESCRIPTION OF THE MECHANISM 1-1 CHARACTERISTIC OF THE K-DECK MECHANISM

CN-A (2 HEAD MONO) 1 V-R 2 COMMON 3 V-L 4 GND CN-A (4 HEAD MONO) 1 SP-L 2 COMMON 3 SP-R 4 GND 5 EP-R/LP-R 6 COMMON 7 EP-L/LP-L CN-C 1 L/C MT (+) 2 L/C MT (–) 3 GND 4 CAM D 5 CAM C 6 CAM B 7 CAM A CN-A (4 HEAD HI-FI) 1 SP-L 2 COMMON 3 SP-R 4 GND 5 EP-R/LP-R 6 COMMON 7 EP-L/LP-L 8 A-R 9 COMMON 10 A-L CN-D 1 CTL 2 CTL 3 AUDIO 4 AUDIO 5 ERASE 6 GND CN-2 1 EVER 5V 2 CAPSTAN F/R 3 CAPSTAN FG 4 CTL-REF 5 CTL 6 I-LIMIT 7 CAPSTAN M/T 12V 8 GND 9 IC GND 10 NON CONTACT CN-B 1 FE HEAD 2 GND CN-1 1 DRUM M/T 12V 2 DRUM SPP CTL 3 DRUM PG 4 NON CONTACT 5 GND 6 DRUM FG CN-A (2 HEAD Hi-Fi) 1 A-R 2 COMMON 3 A-L 4 GND 5 V-R 6 COMMON 7 V-L

2-1. ASSEMBLING DIAGRAM 2-1-1) ASSEMBLING DIAGRAM OF DECK ASS'Y A. TOP VIEW ! 9 8 7 6 5 4 3 2 1 ) ( * & 0 ^ % $ # @ 1. EARTH BRKT ASS'Y 2. FE HEAD 3. S SLANT POLE ASS'Y 4. TENSION BAND ASS'Y 5. REEL TABLE 6. MAIN BASE ASS'Y 7. S SUB BRAKE ASS'Y 8. S MAIN BRAKE ASS'Y 9. IDLER PLATE TOTAL ASS'Y 10. T MAIN BRAKE ASS'Y 11. T-SUB BRAKE ASS'Y 12. RELAY LEVER 13. CAPSTAN MOTOR 14. PINCH LEVER TOTAL ASS'Y 15. L/C BRKT TOTAL ASS'Y 16. CAM GEAR 17. A/C HEAD TOTAL ASS'Y 18. T SLANT POLE ASS'Y 19. DRUM TOTAL ASS'Y 20. RECORD SAFETY LEVER

) ( & * # ^ % $ ! @ 1. CAPSTAN MOTOR 2. F/L RACK 3. CONNECT PLATE 4. REEL BELT 5. REEL GEAR TOTAL ASS'Y 6. RECORD SAFETY LEVER 7. L LOADING ASS'Y 8. R LOADING ASS'Y 9. DRUM TOTAL ASS'Y 10. LOADING RACK ASS'Y

A. In order to effectively maintain the excellent performance and fully utilize the features of this apparatus, and to lengthen the life of the mechanism and tapes, we strongly urge you to perform periodic maintenance and inspection, as described below. ¡ After repairing, do the maintenance described below, irrespective of the length of time in use. B. Cleaning of the Head Drum Ass'y ƒ¡Clean the Drum assembly with a cleaning cloth soaked in liquid cleaner (alcohol) by placing lightly against the Drum and slowly revolving the rotating HEAD DRUM Ass'y by hand (Do not rotate the upper Drum by applying electric power to the motor when cleaning). ƒ¡Do not move the cleaning cloth in the vertical direction against the heat-tip. C. Cleaning the tape transporting section. ƒ¡Clean the tape transporting parts with a cleaning cloth soaked in alcohol. D. Cleaning of driving section ƒ¡Clean the driving section with a cloth soaked in alcohol. E. Routine inspection ƒ¡Perform maintenance and inspection as separately described depending on the period of time in use. ƒ¡Refer to the table of 2-2-3. 2-2-2) CLEANING AND LUBRICATION A. Cleaning of Tape Transporting section and Driving section a. Cleaning of Tape Transporting section ƒ¡The following parts should be cleaned after every 500 hours of use. ƒUTENSION POLE ƒUS SLANT POLE ƒUAC HEAD/AE HEAD ƒUS GUIDE POST ƒUVIDEO HEAD/DRUM ƒUT GUIDE POST ƒUFE HEAD ƒUT SLANT POLE ƒUCAPSTAN SHAFT ƒUS GUIDE ROLLER ƒUT GUIDE ROLLER ƒUPINCH ROLLER ƒUVERTICAL POST ƒ¡As the above parts contact with the video tape, they tend to collect dust particles. If they are stained with dust or foreign substance it has a bad effect on the picture and may lead to damage of the tape. ƒ¡After cleaning with alcohol, allow the parts to dry thoroughly before using a cassette tape. b. Cleaning of Driving section ƒUREEL TABLE ƒUCAPSTAN FLYWHEEL/PULLEY ƒUREEL PULLEY B. LUBRICATION ƒUS REEL POST ƒUT REEL TABLE POST ƒUREEL GEAR POST ƒ¡After cleaning these parts with alcohol, lubricate these with one or two drops of oil. 2-2. PERIODIC MAINTENANCE AND SERVICE SCHEDULE

The following parts should receive periodic service, according to the recommended intervals. ¡ : Check and Replace if necessary. ¡ : Replace PERIODIC SERVICE (TIME) NAME 1000 2000 3000 4000 5000 DRUM TOTAL ASS'Y ¡ ¡ ¡ ¡ ¡ CAPSTAN MOTOR ¡ ¡ L/C BRKT TOTAL ASS'Y ¡ ¡ REEL BELT ¡ ¡ IDLER PLATE TOTAL ASS'Y ¡ ¡ REEL TABLE ¡ T SUB BRAKE ASS'Y ¡ ¡ TENSION BAND ASS'Y ¡ ¡ S MAIN BRAKE ASS'Y ¡ ¡ T MAIN BRAKE ASS'Y ¡ ¡ PINCH ROLLER ASS'Y ¡ ¡ ¡ AC HEAD ASS'Y ¡ FE HEAD ¡ REEL GEAR TOTAL ASS'Y ¡ ¡ Note: Even though the unit is not used frequently, cleaning, lubrication and replacement of the belt should be undertaken every 2 years.

2-3. JIGS AND TOOLS FIG. NO ITEMS MODEL N O REMARKS NTSC: SP MONOSCOPE 7KHz CHECKING OF THE 1 ALIGNMENT TAPE SP COLORBAR 1KHz ¤ TAPE TRANSPORTING (EP MONOSCOPE) SYSTEM PAL: SP MONOSCOPE 6KHz SP COLORBAR 1KHz (LP MONOSCOPE) 2 CLEANING TAPE DHC-602V ¤Ł CHECKING OF THE TAPE (DAEWOO) TRANSPORTING SYSTEM 3 CASSETTE TAPE KT-300NV ¤Ø MEASUREMENT OF (KOKUSAI) KT-300RV REEL TORQUE 4 VHS SPINDLE TSH-V4 ¤Œ MEASUREMENT OF HEIGHT GAUGE REEL HEIGHT 5 TENTELO METER T2-H7-UM ¤º MEASUREMENT OF (TENTELO) THE BACK TENSION FAN TYPE MEASUREMENT OF THE 6 TENSION METER BELOW 3KG ¤ PRESSING FORCE FOR THE PINCH ROLLER 7 DENTAL MIRROR ¤ CHECKING OF THE TAPE TRANSPORTING SYSTEM +DRIVER ¤ -1 ASSEMBLY, 8 HEX DRIVER ¤ -2 DISASSEMBLY AND ADJUSTMENT ADJUSTMENT DR IVER ¤ -3

ALIGNMENT TAPE ¤ ¤Ø ¤º ¤ CLEANING TAPE ¤Ł 30 20 10 0 10 20 30 30 20 10 0 10 20 30 VHS SPINDLE HEIGHT GAUGE ¤Œ ¤ 8-1 8-2 8-3 ¤

3-1. FRONT LOADING ASS’Y REMOVAL (See Fig. 3-1) a. Remove 2 screws ¤ fixing THE FRONT LOADING ASS'Y. NOTE: The FRONT LOADING ASSEMBLY can be removed only in the eject position. 12 A0400 Fig.3-1 FRONT LOADING ASS’Y SEPARATION

a. Remove one screw holding the F/L BRACKET R and move the F/L BRACKET R in the direction of arrow to separate it from the TOP PLATE and CASSETTE HOLDER ASSEMBLY. b. Remove the CASSETTE HOLDER ASSEMBLY. (Fig. 3-2) c. Remove one screw holding the PRISM LINK R and remove the PRISM LINK R from the F/L BRACKET R. (Fig. 3-3) Fig.3-2 DISASSEMBLY OF THE FRONT LOADING ASS’Y Fig.3-3 DISASSEMBLY OF THE F/L BRKT R

e. Release the hook B by pushing it in the direction of the arrow and remove the DOOR OPENER. (Fig. 3-4) f. Remove the LOADING LEVER ASSEMBLY by pressing the connected section of the loading lever assembly in the directions of the arrows. (Fig. 3-5) g. Remove the SAFETY SPRING between the SAFETY LEVER and the CASSETTE HOLDER PLATE. (Fig. 3-5) h. Remove the RELEASE SPRING between the RELEASE LEVER and the SAFETY LEVER R. (Fig. 3-5) Fig. 3-4 DISASSEMBLY OF THE TOP PLATE Fig.3-5 DISASSEMBLY OF THE CASSETTE HOLDER ASS’Y

NOTE: Reassemble the FRONT LOADING MECHANISM in the reverse order. Confirm that the two bosses on the left side of the CASSETTE HOLDER AS are inserted into the groove on the left side of the top plate. Insert the two bosses on the right side of the cassette holder into the groove of the F/L BRAKCET R (Fig. 3-6) 3-3. DRUM ASS’Y/EARTH BRACKET ASS’Y REMOVAL (See Fig.3-7) a. Remove three screws ¤ fixing the DRUM TOTAL ASSEMBLY. b. Remove the EARTH BRACKET ASSEMBLY ¤Ł. c. Carefully lift the DRUM TOTAL ASSEMBLY ¤Ø from the DECK MECHANISM, taking care not to damage or touch the VIDEO HEAD. NOTE: ƒUAfter assembling the DRUM TOTAL ASSEMBLY, confirm that the TAPE runs smooth and refer to chapter 5 "ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM". ƒUWhen assembling the EARTH BRACKET ASSEMBLY, a 3x12 screw should be used and at the other parts, 3x10 screws should be used. Fig.3-7 DRUM TOTAL ASS’Y & EARTH BRKT ASS’Y REMOVAL

ASS’Y REMOVAL (See Fig.3-8) a. Turn over the DECK MECHANISM and remove the REEL BELT ¤ . b. Remove one POLY WASHER ¤Ł. c. Remove the LOADING RACK ASS'Y ¤Ø. d. Remove R & L LOADING ASS'YS ¤Œand ¤º. e. Remove the S and T SLANT POLES ¤ and ¤ by pulling them in the directions of the arrows. CAUTION: ƒUTake care not to get the GUIDE ROLLERS of the S/T SLANT POLES stained with GREASE ƒUWhen reassembling, refer to Fig. 3-9 Fig.3-8 REEL BELT, LOADING RACK ASS’Y, R & L LOADING ASS’YS, S/T SLANT POLE ASS’Y REMOVAL LOADING GEAR (R) LOADING GEAR (L) LOADING RACK CIRCULAR MARK ON LOADING GEAR (R) NOTCH IN LOADING GEAR (R) HOLE OF LOADING RACK TRIANGLE MARK ON LOADING GEAR (L) Fig.3-9 ASSEMBLY OF the R,L LOADING ASS’Y & LOADING RACK ASS’Y

a. Remove one nut hex ¤ from the A/C HEAD POST ¤Œof the MAINBASE. b. Remove the A/C HEAD ASSEMBLY ¤Łfrom the MAINBASE. c. Remove the A/C HEAD SPRING ¤Øfrom the A/C HEAD ASSEMBLY ¤Ł. NOTE: ƒUAfter reassembling, adjust the TAPE TRANSPORTING SYSTEM refering to chapter 5 "ADJUSTMENT OF THE TAPE TRANSPORTING SYSTEM". ƒUAfter adjusting the TAPE TRANSPORTING SYSTEM, spread the A/C HEAD/NUT, AZIMUTH SCREW, and TILT SCREW with LOCKING PAINT. Fig.3-10 DISASSEMBLY OF THE AC HEAD ASS’Y 3-6. L/C BRACKET ASS’Y REMOVAL (See Fig.3-11) a. Remove one screw ¤ from the L/C BRACKET ASSEMBLY ¤Ł. b. Remove the L/C BRACKET ASSEMBLY ¤Ł from the MAINBASE. 3-7. PINCH LEVER TOTAL ASS’Y REMOVAL (See Fig.3-11) a. Remove one POLY WASHER ¤Øfrom the PINCH LEVER POST of the MAINBASE. b. Unhook the PINCH LEVER SPRING ¤Œfrom the hook of MAINBASE ¤ºand remove the PINCH LEVER TOTAL ASSEMBLY ¤ . CAUTION: Take care not to coat GREASE, OIL or other substances on the surface of the PINCH ROLLER ¤ . Fig.3-11 L/C BRKT, PINCH LEVER, CAM GEAR, RELAY LEVER, F/L RACK REMOVAL

a. Remove the CAM GEAR ¤ from the MAINBASE. (Fig.3-11) b. Remove the RELAY LEVER ¤ from the MAINBASE. (Fig. 3-11) c. Remove the F/L RACK ¤ from the MAINBASE by pulling it in the direction of the arrow. NOTE: When reassembling, refer to Fig. 3-12, 13. Fig.3-12 ASSEMBLY OF THE CAM GEAR & RELAY LEVER 3-9. S/T MAIN & SUB BRAKE ASS’Y REMOVAL (See Fig.3-14) a. Unhook the MAIN BRAKE SPRING ¤ from the T MAIN BRAKE LEVER ¤Øand remove the T MAIN BRAKE ASSEMBLY ¤Ø. b. Remove the S MAIN BRAKE ASSEMBLY ¤Ł from the MAINBASE ¤ . c. Unhook the S SUB BRAKE SPRING ¤Œfrom the MAINBASE and remove the S SUB BRAKE LEVER ASSEMBLY ¤ºfrom the MAIN BASE ¤ . d. Unhook the T SUB BRAKE SPRING ¤ from the MAINBASE and remove the T SUB BRAKE LEVER ASSEMBLY ¤ . Fig.3-14 S/T MAIN & SUB BRAKES REMOVAL CAM GEAR DATUM HOLE OF CAM GEAR DATUM HOLE OF MAINBASE F/L RACK Fig.3-13 ASSEMBLY OF THE CAM GEAR & F/L RACK

a. Remove the TENSION SPRING ¤Łfrom the MAINBASE ¤ . (Fig.3-15) b. Turn the DECK MECHANISM over. (Fig.3-16) c. After separating the tab of hook 'A', remove the TENSION BAND ASSEMBLY ¤Ø. (Fig.3-16) NOTE: ƒUAfter assembling the TENSION BAND ASSEMBLY on the MAINBASE, adjust the position of TENSION POLE as shown Fig. 3-17. ƒUAvoid getting GREASE, OIL or foreign substance on the FELT of the BAND BRAKE. ƒUTake care not to deform tab 'A' when separating it . Fig.3-15 TENSION BAND ASS’Y REMOVAL (¥ ) DATUM HOLE OF MAINBASE DATUM HOLE OF TENSION LEVER Fig.3-17 ADJUSTMENT OF THE TENSION POLE POSITION Fig.3-16 TENSION BAND ASS’Y REMOVAL (¥–)

3-12. IDLER PLATE TOTAL ASS’Y & S/T REEL TABLE REMOVAL (See Fig.3-19) Remove 3 screws fixing the CAPSTAN MOTOR and separate the CAPSTAN MOTOR. a. Remove one POLY WASHER ¤ from the REEL GEAR POST ¤Łand remove the IDLER PLATE TOTAL ASSEMBLY ¤Øfrom the MAIN BASE. b. Remove the S/T REEL TABLES ¤Œand two POLY SLIDERS ¤ºfrom the DECK MECHANISM. Fig.3-18 CAPSTAN MOTOR REMOVAL Fig.3-19 IDLER PLATE TOTAL ASS’Y & S/T REEL TABLES REMOVAL CAUTION: ƒUWhen disassembling or assembling the IDLER PLATE TOTAL ASSEMBLY, take care not to bend it.

3-14. REEL GEAR TOTAL ASS’Y & CONNECT PLATE REMOVAL (Fig.3-21) Remove one screw ¤ fixing the FE HEAD and remove the FE HEAD ¤Łfrom the MAINBASE. a. Turn over the DECK MECHANISM and remove one POLY WASHER ¤ from the REEL GEAR POST ¤Ł. b. After separating tab 'B' of the MAINBASE, remove the REEL GEAR TOTAL ASSEMBLY ¤Øfrom the MAINBASE. c. Remove the CONNECT PLATE ¤Œfrom the MAINBASE by pushing it in the direction of the arrow. Fig.3-20 FE HEAD REMOVAL Fig.3-21 REEL GEAR TOTAL ASS’Y & CONNECT PLATE REMOVAL NOTE: ƒUWhen removing the CONNECT PLATE with the F/L RACK installed, take care not to damage or bend the CONNECT PLATE. ƒUAfter assembling or disassembling the REEL GEAR TOTAL ASSEMBLY, take care not to get OIL, GREASE or other substances on the REEL BELT. ƒUTake care not to deform or break tab "B". ƒUCheck the assembly state & the operating state of the REEL GEAR TOTAL ASSEMBLY befor assembling. ƒUAfter reassembling, check the FF, REW, PLAY and REVIEW MODES and the existence of noise when operating the MODES.

When operational problems occur or the mechanism is reassembled, be sure to confirm the following INSTRUCTIONS. a. Make sure that the DATUM HOLE of the CAM GEAR is aligned with the DATUM HOLE in the MAINBASE in the EJECT mode, as shown in Fig.4-1. b. Make sure that part "A" of the RELAY LEVER, when assembled in the CONNECT PLATE, is fully rotated to the left side of "B" of the MAINBASE, and is touching boss "C" of the MAINBASE as, shown in Fig.4-2. CAM GEAR F/L RACK DATUM HOLE OF CAM GEAR DATUM HOLE OF MAIN BASE Fig.4-1 DATUM POSITION OF F/L RACK & CAM GEAR Fig.4-2 DATUM POSITION OF RELAY LEVER & CAM GEAR

triangular marks of CAM SWITCH are aligned with each other as shown in Fig.4-3. d. Make sure that boss "A" of the PINCH LEVER TOTAL ASSEMBLY is positioned at point "B" of the CAM GEAR, as shown in Fig.4-4. TRIANGLE MARKS MUST MEET EACH OTHER Fig.4-3 DATUM POSITION OF CAM SWITCH TRIANGULAR MARKS Fig.4-4 DATUM POSITION OF PINCH LEVER TOTAL ASS’Y & CAM GEAR

the R LOADING ASSEMBLY as shown in Fig. 4-5. f. Make sure that the teeth of the LOADING RACK ASSEMBLY are aligned with those of the R LOADING ASSEMBLY so that the hole of the LOADING RACK ASSEMBLY aligns with the circular mark on the R LOADING ASSEMBLY, as shown in Fig.4-5. R LOADING ASS'Y (B) L LOADING ASS'Y LOADING RACK ASS'Y NOTCH IN R LOADING ASS'Y CIRCULAR MARK OF R LOADING ASS'Y HOLE OF LOADING RACK TRIANGULAR MARK ON L LOADING ASS'Y (A) Fig.4-5 DATUM POSITION OF LOADING RACK ASS’Y & R/L LOADING LEVER ASS’YS

a. Confirm that the position of the TENSION POLE is correctly POSITIONED. Refer to the "4-4 TENSION POLE POSITION ADJUSTMENT ". b. Play back a T-120 TAPE at its center position without assemblying F/L ASSEMBLY and wait until the TAPE running is stabilized (about 5~10 seconds). c. Bring the TENTELOMETER into contact with the TAPE (Fig.4-6) and measure the BACK TENSION. The measuring result should be between 25 and 33 grams. d. If the measuring result is not within this specification, refer to the NOTE below or repeat "4-4 TENSION POLE POSITION ADJUSMENT". (Fig. 4-7) DATUM HOLE TAPE Fig.4-6 BACK TENSION MEASUREMENT NOTE: ƒUIf the measuring result is not within the specification, change the TENSION SPRING position. (To decrease the result, choose hook A. Otherwise, choose hook B). ƒUConfirm that all of the three probes of the TENSION METER are in contact with the TAPE. During this process, don't touch any other parts of the MECHANISM (i.e, MAINBASE). ƒUIt is recommended that this measurement be repeated at least three times for an accurate reading.

a. Remove the FRONT LOADING MECHANISM from the DECK MECHANISM. b. Pull the F/L RACK. c. The S/T POLE BASES are loaded and PLAY BACK MODE starts. d. Turn off the power when the MECHANISM is in the desired position. a. MAKE MECHANICAL MODE be PLAY MODE. Refer to "4-3 MECHANICAL MODE". b. Confirm that the datum hole of TENSION LEVER is aligned with the datum hole of the MAIN BASE. c. If requirement "b" is not satisfied, turn the BAND BRAKE ADJUST CAP clockwise or counter-clockwise until the two datum hole are aligned with each other. 4-4. TENSION POLE POSITION ADJUSTMENT DATUM HOLE OF MAIN BASE DATUM HOLE OF TENSION LEVER Fig.4-7 TENSION POLE POSITION ADJUSTMENT

Generally the TAPE TRANSPORTING SYSTEM has been precisely adjusted in the factory and does not ordinarily require readjustment. But when noise and tape damage take place and part assemblies that compose the TAPE TRANSPORTING SYSTEM are replaced, check and readjust the TAPE TRANSPORTING SYSTEM. Refer to the following FLOW CHART in order to adjust the TAPE TRANSPORTING SYSTEM. S/T GUIDE ROLLER HEIGHT ADJUSTMENT • DRUM TOTAL ASS'Y • A/C HEAD ASS'Y • PINCH LEVER TOTAL ASS'Y S/T GUIDE POST FLANGE A/C HEAD AS ADJUSTMENT (TILT ADJUSTMENT) CLEANING AUDIO AZIMUTH ADJUSTMENT A/C HEAD ADJUSTMENT X-POSITION ADJUSTMENT PLAYBACK PHASE ADJUSTMENT LINEARITY ADJUSTMENT DRUM ENTRANCE/EXIT ENVELOPE FINE TUNING REVIEW ¤APLAY CHANGING OPERATION CHECK AUDIO AZIMUTH ADJUSTMENT AUDIO OUTPUT CHECK (A/C HEAD TILT & HEIGHT ADJUSTMENT) X-POSITION ADJUSTMENT TRACKING • S POLE BASE ASS'Y • T POLE BASE ASS'Y • TENSION LEVER ASS'Y Table.1 ADJUSTMENT FLOW DIAGRAM OF THE TAPE TRANSPORTING SYSTEM

When the parts as shown in Fig. 5-1 are replaced, the TAPE TRANSPORTING SYSTEM has changed. To prevent this, it is essential to know thoroughly and observe the following INSTRUCTIONS. A. ADJUSTMENT OF THE S/T GUIDE ROLLER a. Play back a T-120 TAPE. b. Make sure that excessive TAPE wrinkle does not occur at each S/T GUIDE ROLLER. c. If TAPE wrinkle is observed at the S/T GUIDE ROLLER, adjust them so that no wrinkle occurs.

(TILT ADJUSTMENT) a. Play back a T-120 Tape and check the running condition of the TAPE at the lower flanges of the T GUIDE POST ASS'Y ¤æin Fig. 5-1. b. Adjust the A/C HEAD TILT SCREW untill the TAPE runs stable as shown in Fig. 5-2 C. ADJUSTMENT OF THE AUDIO AZIMUTH (See Fig.5-3) a. Play back the ALIGNMENT CASSETTE TAPE (NTSC: DN2 (SP, 7KHz), PAL: DP2 (SP, 6KHz)) b. Observe audio signals on an OSCILLOSCOPE. c. Turn the A/C HEAD AZIMUTH SCREW to obtain the maximum audio output signal (-9~-3dBm). D. THE HEIGHT ADJUSTMENT OF A/C HEAD a. Play back a T-120 TAPE. b. Make sure that the gap is 0.25mm between the lower end of TAPE and that of A/C HEAD. c. When the gap is longer than 0.25mm, turn the A/C HEAD HEIGHT ADJUST NUT counter-clockwise. When the gap is shorter than 0.25mm, turn it clockwise. Repeat this procedure untill 0.25mm is obtained. ( ) ( ) Fig. 5-2 A/C HEAD ASS’Y ADJUSTMENT (TILT ADJUSTMENT) Fig. 5-3 A/C HEAD ASS’Y GAP Fig. 5-4 A/C HEAD ASS’Y ADJUSTMENT (HEIGHT ADJUSTMENT) TURN THE A/C HEAD TILT SCREW TO THE DIRECTION OF CW TURN THE A/C HEAD TILT SCREW TO THE DIRECTION OF C C W

a. Connect the path adjustment fixture to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT TAPE (COLOR BAR ALIGNMENT). c. Connect channel-1 scope probe to S/W PULSE TEST PIN of PATH ADJ, FIXTURE. d. Connect channel-2 scope probe to ENVELOPE TEST PIN of PATH ADJ, FIXTURE. e. Turn the VR CONTROL to the center point. (If the VR CONTROL is completly turned counter-clockwise, it is positioned on another tracking center.) f. With the VR CONTROL in the center state, turn the ADJUST BOSS by using FLAT TYPE SCREW DRIVER and adjust the X-POSITION to obtain the maximum envelope waveform. TEST POINTS S/W PULSE TEST PIN PATH ADJ. FIXTURE ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR CONTROL PATH ADJ. FIXTURE ADJUST BOSS MAIN BASE. Fig. 5-5 X-POSITION ADJUSTMENT

Phase generator (PG) shifter decides the VIDEO HEAD switching point when a TAPE is played back. In case the Phase generator (PG) shifter isn't correctly tuned, HEAD switching noise or vertical jitter may occur. a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play the ALIGNMENT TAPE (COLOR BAR SIGNAL OR MONOSCOPE SIGNAL) c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. FIXTURE. d. Connect the channel-2 scope probe(1V/div.) to the VIDEO OUT of the MAIN CIRCUIT BOARD. e. Play back the ALIGNMENT TAPE. f. Adjust the PG volume for time interval of 6.5H±0.5H between switching pulse and V-sync signal. TEST POINTS S/W PULSE TEST PIN PATH ADJ. FIXTURE VIDEO OUT MAIN CIRCUIT BOARD MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR595 (PG SHIFTER) MAIN CIRCUIT BOARD Fig. 5-6 PLAYBACK PHASE ADJUSTMENT

a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT TAPE (COLOR BAR SIGNAL). c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. FIXTURE. d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the PATH ADJ. FIXTURE. e. Adjust the VR CONTROL of the PATH ADJ. FIXTURE for maximum envelope signal output of the alignment tape. f. Adjust the S/T GUIDE ROLLER until the envelope signal waveforms of the entrance and exit sides are as shown in Fig. 5-7. TEST POINTS S/W PULSE TEST PIN PATH ADJ. FIXTURE ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR CONTROL PATH ADJ. FIXTURE S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM Fig. 5-7 LINEARITY ADJUSTMENT

a. Connect the PATH ADJ. FIXTURE to PT01 the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT TAPE (COLOR BAR SIGNAL). c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. FIXTURE. d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the PATH ADJ. FIXTURE. e. When turning the VR CONTROL of the PATH ADJ. FIXTURE clockwise or counter-clockwisw, affirm that the envelope thickness changes uniformly. f. If the envelope is not uniform and regular, adjust the S/T GUIDE ROLLER. TEST POINTS S/W PULSE TEST PIN PATH ADJ. FIXTURE ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR CONTROL PATH ADJ. FIXTURE S/T GUIDE ROLLER TAPE TRANSPORTING SYSTEM DRUM ENTRANCE DRUM EXIT ������������������������������ ������������������������������ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ ������������������������������ ������������������������������ ������������������������������ ������������������������������ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ ������������������������������ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ QQQQQQQQQQQQQQQQQQQQQQQQQQQQQQ ������������������������������ ������������������������������ ������������������������������ Fig. 5-8 FINE TUNING OF THE ENVELOPE AT THE DRUM ENTRANCE/EXIT (I) Fig.5-9 FINE TUNING OF THE ENVELOPE AT THE DRUM ENTRANCE/EXIT (II)

a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT TAPE (SP, COLOR BAR SIGNAL). c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the PATH ADJ. FIXTURE. d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the PATH ADJ. FIXTURE. e. Adjust the VR CONTROL of the PATH ADJ. FIXTURE to the center to obtain the maximum envelope signal of the ALIGNMENT TAPE. f. After operating the VCR in the REVIEW MODE about 15 secs, change the REVIEW MODE to the PLAY BACK MODE. g. Change operation mode from REVIEW MODE to PLAY MODE and then make sure that the envelope waveform is restored to the maximum condition within 3 seconds. h. If the requirement is not satisfied, make sure that the TAPE runs normal at the lower part of the T GUIDE POST. Then adjust the S/T GUIDE ROLLER precisely. TEST POINTS S/W PULSE TEST PIN PATH ADJ. FIXTURE ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR CONTROL PATH ADJ. FIXTURE S/T GUIDE ROLLER TAPE TRANSPORTIN SYSTEM WAVEFORM PICTURE Fig. 5-10 CHECK OF TRANSITIONAL OPERATION (FROM REVIEW WAVEFORM TO PLAY WAVEFORM)

a. Connect the OSCILLOSCOPE to the AUDIO OUTPUT JACK. b. Play back the ALIGNMENT TAPE (NTSC: DN1 (SP, 1KHz), PAL: DP1 (SP, 1KHz)). c. Check the AUDIO OUTPUT SIGNAL is -9~-3dBm. d. If the requirement "c" is not satisfied, adjust the A/C HEAD TILT SCREW and A/C HEAD HEIGHT NUT to obtain the maximum audio output. (Fig. 5-3) K. A/C HEAD AZIMUTH ADJUSTMENT a. Connect the OSCILLOSCOPE to the AUDIO OUTPUT JACK. b. Play back the ALIGNMENT TAPE (NTSC: DN2 (SP, 7KHz), PAL: DP2 (SP, 6KHz)). c. Adjust the A/C HEAD AZIMUTH SCREW to obtain the audio output -9~-3dBm. (Fig. 5-3) d. Repeat the process "H. DRUM ENTRANCE/EXIT". TEST POINTS AUDIO OUTPUT AUDIO OUTPUT JACK MEASURING EQUIPMENT OSCILLOSCOPE TEST POINTS AUDIO OUTPUT AUDIO OUTPUT JACK MEASURING EQUIPMENT OSCILLOSCOPE

a. Connect the PATH ADJ. FIXTURE to PT01 of the MAIN CIRCUIT BOARD. b. Play back the ALIGNMENT TAPE (COLOR SIGNAL BAR). c. Connect the channel-1 scope probe to the S/W PULSE TEST PIN of the of the PATH ADJ. FIXTURE. d. Connect the channel-2 scope probe to the ENVELOPE TEST PIN of the PATH ADJ. FIXTURE. e. Adjust the VR CONTROL to the center position. (When the VR CONTROL is completely turned counter- clockwise, it is set at another tracking center position). f. When the VR CONTROL is fully rotated clockwise or counter-clockwise, turn the ADJUST BOSS of the MAINBASE and adjust the X-POSITION for the envelope waveform to be as shown in Fig. 5-11 g. Repeat the process "F. PLAYBACK PHASE ADJUSTMENT". TEST POINTS S/W PULSE TEST PIN PATH ADJ. FIXTURE ENVELOPE TEST PIN PATH ADJ. FIXTURE MEASURING EQUIPMENT OSCILLOSCOPE ADJUSTMENT VR CONTROL PATH ADJ. FIXTURE ADJUST BOSS MAIN BASE. Fig. 5-11 X-POSITION ADJUSTMENT

LOC. STOCK NO. PART NAME DESCRIPTION NTSC M1000 97PC0048D- DECK TOTAL AS DRN-7203 (HT 2 HD EP NON-DLC) M1000 97PC0186D- DECK TOTAL AS DPN-7204 “(HT 2 HD EP NON-DLC, HEAD CLNR, VCP)” M1000 97PC0187D- DECK TOTAL AS DRN-7204 “(HT 2 HD EP NON-DLC, HEAD CLNR)” M1000 97PC0218D- DECK TOTAL AS DPN-7206 “(2 HD EP NON-DLC, HEAD CLNR, VCP, SQPB)” M1000 97PC0116D- DECK TOTAL AS DRN-7223 (HT 2 HD EP DLC) M1000 97PC0117D- DECK TOTAL AS DRN-7233 (HT 2 HD EP DLC-BK) M1000 97PB0884D- DECK TOTAL AS DRN-7400 (4 HD MONO NON-DLC) M1000 97PC0108D- DECK TOTAL AS DRN-7401 “(4 HD MONO NON-DLC, HEAD CLNR)” M1000 97PB0892D- DECK TOTAL AS DRN-7420 (4 HD MONO DLC) M1000 97PC0109D- DECK TOTAL AS DRN-7421 “(4 HD MONO DLC, HEAD CLNR)” M1000 97PC0063D- DECK TOTAL AS DRN-7430 (4 HD MONO DLC-BK) M1000 97PB0887D- DECK TOTAL AS DRN-7600 (4 HD HI-FI NON-DLC) M1000 97PC0050D- DECK TOTAL AS DRN-7603 (HT 4 HD HI-FI NON-DLC) M1000 97PC0110D- DECK TOTAL AS DRN-7604 “(HT 4 HD HI-FI NON-DLC, HEAD CLNR)” M1000 97PC0090D- DECK TOTAL AS DRN-7623 (HT 4 HD HI-FI DLC) M1000 97PC0111D- DECK TOTAL AS DRN-7624 “(HT 4 HD HI-FI DLC, HEAD CLNR)” M1000 97PC0064D- DECK TOTAL AS DRN-7630 (4 HD HI-FI DLC-BK) M1000 97PC0107D- DECK TOTAL AS DRN-7633 (HT 4 HD HI-FI DLC-BK)

DRP-7103 (HT 2 HD SP MONO NON-DLC) M1000 97PC0184D- DECK TOTAL AS DPP-7104 “(HT 2 HD SP MONO NON-DLC, HEAD CLNR, VCP)” M1000 97PC0182D- DECK TOTAL AS DRP-7104 “(HT 2 HD SP MONO NON-DLC, HEAD CLNR)” M1000 97PC0059D- DECK TOTAL AS DRP-7123 (HT 2 HD SP MONO DLC) M1000 97PC0085D- DECK TOTAL AS DRP-7124 “(HT 2 HD SP MONO DLC, HEAD CLNR)” M1000 97PC0068D- DECK TOTAL AS DRP-7203 (HT 2 HD SP/LP MONO NON-DLC) M1000 97PC0060D- DECK TOTAL AS DRP-7223 (HT 2 HD SP/LP MONO DLC) M1000 97PC0058D- DECK TOTAL AS DRP-7321 “(2 HD HI-FI DLC, HEAD CLNR)” M1000 97PC0183D- DECK TOTAL AS DRP-7322 (2 HD HI-FI DLC) M1000 97PC0086D- DECK TOTAL AS DRP7301 “(2 HD HI-FI NON-DLC, HEAD CLNR)” M1000 97PC0072D- DECK TOTAL AS DRP-7400 (4 HD MONO NON-DLC) M1000 97PC0192D- DECK TOTAL AS DRP-7401 “(4 HD MONO NON-DLC, HEAD CLNR)” M1000 97PC0073D- DECK TOTAL AS DRP-7420 (4 HD MONO DLC) M1000 97PC0130D- DECK TOTAL AS DRP-7421 “(4 HD MONO DLC, HEAD CLNR)” M1000 97PC0070D- DECK TOTAL AS DRP-7603 (HT 4 HD HI-FI NON-DLC) M1000 97PC0207D- DECK TOTAL AS DRP-7604 “(HT 4 HD HI-FI NON-DLC, HEAD CLNR)” M1000 97PC0071D- DECK TOTAL AS DRP-7623 (HT 4 HD HI-FI DLC) M1000 97PC0209D- DECK TOTAL AS DRP-7624 “(HT 4 HD HI-FI DLC, HEAD CLNR)”

DRS-7400 (4 HD MONO NON-DLC) M1000 97PC0075D- DECK TOTAL AS DRS-7420 (4 HD MONO DLC) M1000 97PC0189D- DECK TOTAL AS DRS-7603 (HT 4 HD HI-FI NON-DLC) M1000 97PC0054D- DECK TOTAL AS DRS-7623 (HT 4 HD HI-FI DLC) 6-4-2. PA RTS LIST OF DRUM PRICE ASS¡fl Y LOC. STOCK NO. PART NAME DESCRIPTION NTSC AD001 97PA255101 DRUM PRICE AS CYN-K210H (HT 2 HD EP NON-DLC) AD001 97PA266601 DRUM PRICE AS CYN-K210SQ “(2 HD EP NON-DLC, SQPB)” AD001 97PA258971 DRUM PRICE AS CYN-K212H (HT 2 HD EP DLC) AD001 97PA259041 DRUM PRICE AS CYN-K213H (HT 2 HD EP DLC-BK) AD001 97PA251801 DRUM PRICE AS CYN-K410 (4 HD MONO NON-DLC) AD001 97PA252471 DRUM PRICE AS CYN-K412 (4 HD MONO DLC) AD001 97PA258541 DRUM PRICE AS CYN-K413 (4 HD MONO DLC-BK) AD001 97PA251701 DRUM PRICE AS CYN-K610 (4 HD HI-FI NON-DLC) AD001 97PA257601 DRUM PRICE AS CYN-K610H (HT 4 HD HI-FI NON-DLC) AD001 97PA257771 DRUM PRICE AS CYN-K612H (HT 4 HD HI-FI DLC) AD001 97PA258641 DRUM PRICE AS CYN-K613 (4 HD HI-FI DLC-BK) AD001 97PA260741 DRUM PRICE AS CYN-K613H (HT 4 HD HI-FI DLC-BK)

CYP-K110H (HT 2 HD SP MONO NON-DLC) AD001 97PA255271 DRUM PRICE AS CYP-K112H (HT 2 HD SP MONO DLC) AD001 97PA258801 DRUM PRICE AS CYP-K210H (HT 2 HD SP/LP MONO NON-DLC) AD001 97PA255371 DRUM PRICE AS CYP-K212H (HT 2 HD SP/LP MONO DLC) AD001 97PA254071 DRUM PRICE AS CYP-K312 (2 HD HI-FI DLC) AD001 97PA260501 DRUM PRICE AS CYP-K310 (2 HD HI-FI NON-DLC) AD001 97PA253101 DRUM PRICE AS CYP-K410 (4 HD MONO NON-DLC) AD001 97PA253271 DRUM PRICE AS CYP-K412 (4 HD MONO DLC) AD001 97PA253301 DRUM PRICE AS CYP-K610H (HT 4 HD HI-FI NON-DLC) AD001 97PA253471 DRUM PRICE AS CYP-K612H (HT 4 HD HI-FI DLC) SECAM AD001 97PA253501 DRUM PRICE AS CYS-K410 (4 HD MONO NON-DLC) AD001 97PA253671 DRUM PRICE AS CYS-K412 (4 HD MONO DLC) AD001 97PA278201 DRUM PRICE AS CYS-K610 (HT 4 HD HI-FI NON-DLC) AD001 97PA278371 DRUM PRICE AS CYS-K612 (HT 4 HD HI-FI DLC)

Y LOC. STOCK NO. PART NAME DESCRIPTION DRUM PRICE AS B0020 97S1401700 DRUM BASE “K, FM-M(NON-MACHINING,ADC)” B0030 7001300811 MACHINE SCREW PAN 3X8 MFZN B0050 97SA310600 DRUM MOTOR AS SDV-0306A 97SA312000 DRUM MOTOR AS E20XL18 97SA319100 DRUM MOTOR AS GDV-D01A B0060 7001261011 MACHINE SCREW PAN 2.6X10 MFZN B0070 7051260811 MACHINE SCREW PAN 2.6X8 SW MFZN B0090 97SA305400 DAMPER DYNAMIC AS “SECC T1.2, LUMMIRROR T0.25” B0040 DRUM AS (REFERRING TO LIST OF DRUM PRICE ASS’Y)\ F/L AS AF001 97SA251400 F/L AS K-MECHA DECK AS AM001 DECK AS (REFERRING TO LIST OF DECK TOTAL ASS’Y) A0100 97SA309700 MAIN BASE AS K-MECHA A0200 97S0901400 PLATE CONNECY SECC T1.0 A0300 97S2701800 RACK F/L PBT(KP213G30) NATURAL A0400 97SA310900 S SLANT POLE AS K-MECHA A0500 97SA311000 T SLANT POLE AS K-MECHA A0600 97SA308500 L LOADING AS K-MECHA A0700 97SA308600 R LOADING AS K-MECHA A0800 97SA308400 LOADING RACK AS K-MECHA A0900 97S3101800 WASHER POLY D3.1XD8XT0.5 A1000 97S8100700 MOTOR CAPSTAN F2QTB12 97S8101200 MOTOR CAPSTAN DMVCMC06ER A1100 97S3102000 SCREW TAPTITE TT2 BIN-P 2.6X7 MFZN A1200 97S3004000 SPG AC HEAD SUS304WPB D1.2 A1300 97SA311200 AC HEAD AS K-MECHA 97SA318700 AC HEAD AS K-MECHA(KUGAMI) 97SA311300 AC HEAD AS K-MECHA(VCP) A1400 7391300211 NUT HEX 6N-1-5 MFZN A1500 97S2604100 LEVER RELAY ZDC-2 A1600 97S2701400 GEAR CAM DELIN 500 NATURAL A1700 97SA310700 PINCH LEVER TOT AS K-MECHA

K-MECHA B1905 97SA414100 L/C BRKT AS K-MECHA B1910 97PA409200 L/C MOTOR AS K-MECHA B1920 97P6538222 L/C MOTOR PCB PHENOL T1.6 B1930 97P6271500 CONN WAFER(ANGLE) 00-8283-0711-0000 B1940 5SSFF1DKM10 CAM SWITCH MMS00320ZMBO B1960 97S9201500 WORM WHEEL DELIN 100 NATURAL A2000 7274300611 SCREW TAPTITE TT3 RND 3X6 MFZN A2100 97SA311600 IDLER PLATE AS K-MECHA A2200 97S3108200 WASHER POLY D2.6XD6XT0.5 A2300 97S2901600 TABLE REEL F20 BLACK A2400 97S3903600 POLY SLIDER D3.1XD6XT0.5 A2500 97SA310800 TENSION BAND AS K-MECHA B2500 97SA409800 TENSION LEVER AS K-MECHA B2510 97SA409700 BAND BRAKE AS K-MECHA B2520 97S0400700 BAND BRAKE CAP DURACON M90-02 NATURAL A2600 97S3003500 SPG TENSIION SWPB D0.4 A2700 97SA309300 S SUB BRAKE AS K-MECHA A2800 97SA309400 T SUB BRAKE AS K-MECHA A2900 97SA309110 MAIN BRAKE AS K-MECHA A3100 97S8012900 HEAD FE HVFHF0004AK 97S8004500 HEAD FE MH-132D A3200 97S3102100 SCREW TAPTITE TT2 BIN-P 2.6X10 MFZN A3300 97SA309000 REEL GEAR TOT AS K-MECHA A3400 97S3108200 WASHER POLY D2.6XD6.0XT0.5 A3500 97S5500400 BELT REEL CR68 A3600 97S2603500 LEVER RECORD SAFETY F20-03 NATURAL A3700 97SB381100 EARTH BRCKET AS “G,FM,K-MECHA” A3800 7274301011 SCREW TAPTITE TT3 RND 3X10 MFZN A3900 7274301211 SCREW TAPTITE TT3 RND 3X12 MFZN A4000 7274300611 SCREW TAPTITE TT3 RND 3X6 MFZN A4100 2291129004 OIL LUBRICANT OA-305P A4200 2291131304 GREASE DELUX 5221G(NAM-YOUNG) HEAD CLEANER AS AC001 97SA381500 HEAD CLEANER AS “K,FM-MECHA”