JVC TH-A35 Service Manual Download Page 10 | Manualshive

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TH-A35

1-10

<Front panel assembly>

Removing the front PWB & Led, PWB

(See Fig.12-13)

Prior to performing the following procedure, remove

the front panel assembly.

1. Remove the seven screws X and 3 screws

attaching the front panel board inside the front
panel assembly.

2. Push out KNOB, VOLUME through PWB, FR.

Fig. 13

Fig. 12

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Summary of Contents for TH-A35

Page 1: ...fety precautions 1 2 Preventing static electricity 1 3 Important for laser products 1 4 Disassembly method 1 5 Description of major ICs 1 15 Wiring connection 1 20 Area Suffix J U S A C Canada COMPACT SUPER VIDEO D I G I T A L S U R R O U N D D I G I T A L E X P R O L O G I C VOLUME PHONES DSP SORROUND SOURCE STANDBY STANDBY ON ...

Page 2: ...uired the original lead routing and dress should be observed and it should be confirmed that they have been returned to normal after re assembling 5 Leakage currnet check Electrical shock hazard testing After re assembling the product always perform an isolation check on the exposed metal parts of the product antenna terminals knobs metal cabinet screw heads headphone jack control shafts etc to be...

Page 3: ...ng transport and before installation both sides of the laser diode on the replacement optical pickup are shorted After replacement return the shorted parts to their original condition Refer to the text 2 Do not use a tester to check the condition of the laser diode in the optical pickup The testers internal power source can easily destroy the laser diode 1 2 Handling the traverse unit optical pick...

Page 4: ...LASS 1 LABEL WARNING LABEL 5 CAUTION If safety switches malfunction the laser is able to function 6 CAUTION Use of controls adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure CAUTION Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check VARNING Osynlig laserstrålning är denna...

Page 5: ...ASSEMBLY Removing the MPEG BOARD Removing the MAIN BOARD Removing FAN Removing the Thermal Regifer Removing the VCD mechanism base assembly Removing PWB AMP Removing Power fruformer Front panel ASSEMBLY Removing the FRONT PWB LED PWB Commence disassembly of this set by removing the main units and then proceed to the components and assemblies inside the units MAIN BODY ...

Page 6: ... by holding the two sides of it while moving it upward and backward Removing the Tray Door See Fig 2 1 Eject the disc tray Rotate the screw B counter clockwise if no supply 2 Lift up the tray door in the indicated direction Fig 1 CLASS 1 LASER PRODUCT Right cover Left cover Top cover Rear cover Fig 2 B ...

Page 7: ... 4 1 Unserew the screw H form mpeg board unit and unit and main board unit 2 Unserw the screw K form body 3 Take the supply cord out of panel rear 4 Remove teh panel rear with tuner CHAS MAIN ASSEMBLY Removing the MPEG BOARD See Fig 5 Caution Mpeg board may be taken out only when the panel rear and Tunet have been taken away 1 Pull the cable connetor mpeg board 2 Unscrew the screw M 3 Separate the...

Page 8: ...rew R then you can remove the main board with heat sink 4 Untie or open connecters to power transformer PWB AMP DVD mech Removing FAN See Fig 8 1 Unscreew 3 screws R with HOLDER pull out connector from PWB main 2 Unscrew 2 screws S from HLDR Removing the Thermal Regifer See Fig 9 1 Unscreew the screws though power IC and thermal HOLDER 2 Pull wire of thermal register from PWB main P Q Fig 6 Fig 7 ...

Page 9: ...rnesses from connector CN191 and CN192 on the main board and release them from the cord stopper respectively 2 Remove the four screws M attaching the transformer assembly Removing PWB AMP See Fig 11 1 Unscrew 4 screws L 2 Pull out connecter from PWB AMP Removing Power frusformer See Fig 11 1 Unscrew 4 screws N 2 Untie wire connecter to PWB MAIN Fig 11 Fig 10 ...

Page 10: ...B Led PWB See Fig 12 13 Prior to performing the following procedure remove the front panel assembly 1 Remove the seven screws X and 3 screws attaching the front panel board inside the front panel assembly 2 Push out KNOB VOLUME through PWB FR Fig 13 Fig 12 ...

Page 11: ...35 1 11 1 Pin layput 2 Block diagram Description of major ICs STK402 950 U701 5 channels AF power amplifier 4 200 unit mm 3 6 12 0 2 0 16 5 21 0 32 0 27 3 4 0 23x2 0 46 0 0 5 5 5 0 4 2 9 8 5 1 24 78 0 70 0 ...

Page 12: ...TH A35 1 12 2 PIN CONFIGURATION WM8770 U1 8 channel code c volume control 1 ...

Page 13: ...TH A35 1 13 1 Block Diagram UPD78F0034A IC 401 CPU ...

Page 14: ...TH A35 1 14 2 Outline of Function ...

Page 15: ...TH A35 1 15 1 BLOCK DIAGRAM UPD 16315 IC904 VFD control ler driver Description of major ICs ...

Page 16: ...TH A35 1 16 2 Pin Layout AK4112BVF AK4112 U17 Digital audio receiver 1 BLOCK DIAGRAM ...

Page 17: ... Pim layout DQ3 DQ9 DQ2 A6 DQ0 W A3 RB DQ6 A8 A9 DQ13 A17 A10 DQ14 A2 DQ12 DQ10 DQ15A 1 VCC DQ4 DQ5 A7 DQ7 NC NC AI03844 M29W160DT M29W160DB 12 1 13 24 25 36 37 48 DQ8 NC A19 A1 A18 A4 A5 DQ1 DQ11 G A12 A13 A16 A11 BYTE A15 A14 VSS E A0 RP VSS ...

Page 18: ...Sense Amp llfler Current Comparator G N D V s w S B 1 0 7 V S V C L K S R Q Q S l o p e C o m p e n s a t i o n SLEEP VREF V25 CN PVDD CP P N P N FAOUT FBK FBK VDD IS CLOCK RPW M CPW M EAOUT EAIN INAMPOUT INPUT INPUT MUTE UVLO REFERENCE OUTPUT DRIVERS LOGIC FAULT TIMER 5V Reference 26 4 1 10 CLK OSC SYNC 220m V PVDD MUX MUTE MUTE 7 14 13 9 11 8 6 5 28 27 25 15 17 FEEDBACK AMP ERROR AMP CURRENT SEN...

Page 19: ...iagram MC 14053B U21 digitally controlled analog swith Pin layout VB SD LIN VDD PULSE GEN R S Q VSS UV DETECT DELAY HV LEVEL SHIFT VCC PULSE FILTER UV DETECT VDD VCC LEVEL SHIFT VDD VCC LEVEL SHIFT LO VS COM R S Q R S R Q HIN HO YI Y0 Z1 Z0 INH VEE VDD Y X X1 X0 A B C VSS Z ...

Page 20: ...TH A35 1 20 Wiring connection ...

Page 21: ...TH A35 1 21 M E M O ...

Page 22: ...No 22020 Printedin Japan 200305 TH A35 VICTOR COMPANY OF JAPAN LIMITED AV MULTIMEDIA COMPANY AUDIO VIDEO SYSTEMS CATEGORY 10 1 1Chome Ohwatari machi Maebashi city 371 8543 Japan ...

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