JVC KW-ADV794J Service Manual Download Page 22

Page: 22 / 22

(No.MA493<Rev.002>)

VSE

Printed in Japan

Victor Company of Japan, Limited

Mobile Entertainment Division 2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525, Japan

Summary of Contents for KW-ADV794J

Page 1: ...n Limited Lead free solder used in the board material Sn Ag Cu melting point 219 Centigrade Lead free solder used in the board material Sn Cu melting point 230 Centigrade TABLE OF CONTENTS 1 PRECAUTION 1 6 2 SPECIFIC SERVICE INSTRUCTIONS 1 9 3 DISASSEMBLY 1 9 4 ADJUSTMENT 1 16 5 TROUBLESHOOTING 1 19 For KW ADV794 KW AVX740 KW AVX746 KW AVX748 For KW AVX740E EE KW AVX640E KW AVX746EU KW AVX646EU Fo...

Page 2: ...reo Separation 40 dB AM Tuner Sensitivity Selectivity 20 µV 40 dB DVD CD Signal Detection System Non contact optical pickup semiconductor laser Frequency Response DVD fs 48 kHz 96 kHz 16 Hz to 22 000 Hz VCD CD 16 Hz to 20 000 Hz Dynamic Range 93 dB Signal to Noise Ratio 95 dB Wow and Flutter Less than measurable limit USB USB Standards USB 2 0 Full Speed Data Transfer Rate Full Speed Maximum 12 Mb...

Page 3: ...VD CD Signal Detection System Non contact optical pickup semiconductor laser Frequency Response DVD fs 48 kHz 96 kHz 16 Hz to 22 000 Hz VCD CD 16 Hz to 20 000 Hz Dynamic Range 93 dB Signal to Noise Ratio 95 dB Wow and Flutter Less than measurable limit USB USB Standards USB 2 0 Full Speed Data Transfer Rate Full Speed Maximum 12 Mbps Low Speed Maximum 1 5 Mbps Compatible Device Mass storage class ...

Page 4: ...VD CD Signal Detection System Non contact optical pickup semiconductor laser Frequency Response DVD fs 48 kHz 96 kHz 16 Hz to 22 000 Hz VCD CD 16 Hz to 20 000 Hz Dynamic Range 93 dB Signal to Noise Ratio 95 dB Wow and Flutter Less than measurable limit USB USB Standards USB 2 0 Full Speed Data Transfer Rate Full Speed Maximum 12 Mbps Low Speed Maximum 1 5 Mbps Compatible Device Mass storage class ...

Page 5: ... System Non contact optical pickup semiconductor laser Frequency Response DVD fs 48 kHz 96 kHz 16 Hz to 22 000 Hz VCD CD 16 Hz to 20 000 Hz Dynamic Range 93 dB Signal to Noise Ratio 95 dB Wow and Flutter Less than measurable limit USB USB Standards USB 2 0 Full Speed Data Transfer Rate Full Speed Maximum 12 Mbps Low Speed Maximum 1 5 Mbps Compatible Device Mass storage class Compatible File System...

Page 6: ...ne jack control shafts etc to be sure the product is safe to operate without danger of electrical shock Do not use a line isolation transformer during this check Plug the AC line cord directly into the AC outlet Using a Leakage Current Tester measure the leakage current from each exposed metal parts of the cabinet particular ly any exposed metal part having a return path to the chassis to a known ...

Page 7: ...ster to check the condition of the laser diode in the optical pickup The tester s internal power source can easily destroy the laser diode 1 6 Handling the traverse unit optical pickup 1 Do not subject the traverse unit optical pickup to strong shocks as it is a sensitive complex unit 2 Cut off the shorted part of the flexible cable using nippers etc after replacing the optical pickup For specific...

Page 8: ...duct uses visible and or invisible laser radiation and is equipped with safety switches which prevent emission of radiation when the drawer is open and the safety interlocks have failed or are defeated It is dangerous to defeat the safety switches 5 CAUTION If safety switches malfunction the laser is able to function 6 CAUTION Use of controls adjustments or performance of procedures other than tho...

Page 9: ...screws B attaching the both side of the Front chassis See Fig 2 4 Disengage two hooks b engaged both side of the Front chassis See Fig 2 Fig 2 3 1 2 Removing the Heat sink See Fig 3 1 Remove the three screws C and two screws D attaching the Heat sink Fig 3 3 1 3 Removing the Rear heat sink See Fig 4 1 Remove the two screws E and two screws F attaching the Rear heat sink Fig 4 3 1 4 Removing the DV...

Page 10: ...e DVD mecha nism See Fig 9 Fig 9 3 1 5 Removing the BT amp board See Fig 10 1 Disconnect the card wire from Main board connected to connector CN311 of the BT amp board 2 Disconnect connector wire from Sub amp board connected to connector CN341 of the BT amp board 3 Remove the four screws L attaching the BT amp board Fig 10 3 1 6 Removing the Sub amp board See Fig 11 12 1 Remove the one screw M att...

Page 11: ...d to connector CN101 of the Main board See Fig 13 2 Disconnect the connector wire from FAN connected to con nector CN112 of the Main board See Fig 13 Fig 13 3 Remove the six screws P and two screws Q attaching the Rear panel Se Fig 14 Fig 14 3 1 8 Removing the Center chassis See Fig 15 1 Remove the four screws R attaching the Center chassis Fig 15 3 1 9 Removing the Main board See Fig 16 1 Remove ...

Page 12: ...sm assembly See Fig 1 to 6 1 Solder the short land section on the flexible wire of pickup See Fig 1 Caution Solder the short land section on the flexible wire of pickup before disconnecting the flexible wire form the connector CN101 on the Front end board If the flexible wire is disconnected without attaching the solder the pickup may be destroyed by static electricity When attaching the Traverse ...

Page 13: ... Fig 6 Fig 6 3 2 2 Removing the Front end board See Fig 7 1 Remove the Motor wires from loading motor soldered to TP79 and TP81 of the Front end board 2 Remove the two screws B attaching the Front end board Fig 7 3 2 3 Removing the Loading arm assembly See Fig 8 1 Remove the Loading arm spring L from Loading arm assembly 2 Slide to left side and then disengage hook a then hook b Fig 8 3 2 4 Removi...

Page 14: ...the Slide cam assembly See Fig 13 1 Slide to backward the Slide cam assembly and the remove the Slide cam spring 2 Slide to frontward the slide cam assembly and then take out it Fig 13 3 2 8 Removing the Photo board See Fig 14 1 Pressing the hook c and then slide to backward slide to the arrow side the Disc plate 2 Remove the one screw F attaching the Photo board Fig 14 3 2 9 Removing the Loading ...

Page 15: ...r assembly 5 Lift up the part b of the Roller assembly and then release part c When release part c R collar R is easy to come off does not lose it CAUTION When reattach the Roller assembly Middle gear should keep direction and Slit washer should be change new part Fig 19 3 2 11 Removing the Roller See Fig 20 1 Remove the Slit washer 2 Pull out the Roller shaft CAUTION When reattach the Roller shaf...

Page 16: ...olume lndication 0 Loudness OFF 4 5 Dummy load Exclusive dummy load should be used for AM and FM For FM dummy load there is a loss of 6dB between SSG output and antenna input The loss of 6dB need not be considered since direct reading of figures are applied in this working standard 4 6 How to connect the extension cable for adjusting Caution Be sure to attach the heat sink and rear bracket onto th...

Page 17: ...tent Backup memory Installer memory User memory Tuner area setting Error history Diag data EEPROM in the DVD module EEPROM in the bluetooth module TEMPERATURE Temperature display of DVD module DVD CHECK MODE See DVD CHECK MODE for details RUNNING MODE No use ERROR DIAG DATA Error history display DVD ERROR Error history of DVD module MECHA ERROR Error history of door mechanism Except KW AVX64x seri...

Page 18: ... CD For EF phase error CD LASER ON CD_LD lights and laser current is displayed Laser current value jitter value DVD LASER ON DVD_LD lights and laser currrent is displayed Laser current value jitter value DVDx1 JITTER MODE DVD x1 jitter measuring mode for use in mechanism adjustment Laser current value jitter value SEARCH JITTER The search and jitter measurement to an appointed position of DVD Posi...

Page 19: ...GN BK VI BK WH GY GY BK WH BK RD OR WH 6 1 11 16 12 9 7 5 10 8 15 2 3 BL WH WH RD BK LB GN VI YL Green Gray Yellow Orange OR Violet White Light Blue Red Black GY 8 7 6 5 16 15 13 4 3 2 1 12 11 10 9 BK RD WH GN VI GY BL WH GN BK VI BK GY BK YL WH BK LB YL 14 OR WH BR BR 14 BR Brown 13 LB YL BL Blue BL BL 4 ...

Page 20: ...WH VI BK VI GN BK GN BK RD BL WH VI Black Red Blue White Violet GN GY Gray YL Yellow Green BR Brown OR Orange BR 14 8 7 6 5 16 15 13 4 3 2 1 12 11 10 9 BK RD1 WH GN VI GY BL WH GN BK VI BK GY BK YL1 NC WH BK BR LB YL OR WH 14 13 LB Light Blue VI GY WH GN NC NC BR YL2 BK OR WH VI BK GY BK WH BK GN BK BL WH LB YL 13 RD2 2 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ...

Page 21: ... No MA493 Rev 002 1 21 ...

Page 22: ... No MA493 Rev 002 VSE Printed in Japan Victor Company of Japan Limited Mobile Entertainment Division 2967 3 Ishikawa machi Hachioji shi Tokyo 192 8525 Japan ...

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