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JVC KW-ADV794J Service Manual

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SERVICE MANUAL
DVD RECEIVER WITH MONITOR
2011
5 S ERVICE MANUAL
MA493
KW-ADV794J, KW-AVX640E, KW-AVX640J,
KW-AVX646EU, KW-AVX646U, KW-AVX648UF,
KW-AVX740E, KW-AVX740EE, KW-AVX740J,
KW-AVX746A, KW-AVX746EU, KW-AVX746U,
KW-AVX746UT, KW-AVX748JW
For
KW-ADV794J/KW-AVX640J/
KW-AVX740J/KW-AVX748JW
For KW-ADV794/
KW-AVX740/KW-AVX640/
KW-AVX746/KW-AVX646/
COPYRIGHT © 2011 Victor Company of Japan, 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)
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
For
KW-ADV794J/
KW-AVX740J/
KW-AVX640J
KW-AVX648

TABLE OF CONTENTS

COPYRIGHT © 2011 Victor Company of Japan, Limited
No.MA493
2011/5

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  Summary of Contents for JVC KW-ADV794J

  • Page 1: Table Of Contents

    SERVICE MANUAL DVD RECEIVER WITH MONITOR MA493<Rev.002> 2011 5 S ERVICE MANUAL KW-ADV794J, KW-AVX640E, KW-AVX640J, KW-AVX646EU, KW-AVX646U, KW-AVX648UF, KW-AVX740E, KW-AVX740EE, KW-AVX740J, KW-AVX746A, KW-AVX746EU, KW-AVX746U, KW-AVX746UT, KW-AVX748JW KW-ADV794/KW-AVX740/ KW-AVX746/KW-AVX748 KW-AVX740E,EE/KW-AVX640E/ KW-ADV794J/KW-AVX640J/ KW-AVX746EU/KW-AVX646EU KW-AVX740J/KW-AVX748JW For KW-ADV794/ KW-ADV794J/ KW-AVX740/KW-AVX640/ KW-AVX740J/ KW-AVX746/KW-AVX646/ KW-AVX640J KW-AVX648 COPYRIGHT ©...
  • Page 2 SPECIFICATION KW-ADV794J/KW-AVX748JW/KW-AVX740J/KW-AVX640J AMPLIFIER ≤ 20 W RMS × 4 Channels at 4 Ω and Power Output 1% THD+N Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω) 4 Ω (4 Ω to 8 Ω allowance) Load Impedance Equalizer Control Range Level ±12 dB...
  • Page 3 KW-AVX740E/KW-AVX640E/KW-AVX746EU/KW-AVX646EU AMPLIFIER Maximum Power Output Front/Rear 50 W per channel 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% Continuous Power Output (RMS) Front/Rear total harmonic distortion 4 Ω (4 Ω to 8 Ω allowance) Load Impedance Equalizer Control Range Level ±12 dB...
  • Page 4 KW-AVX740EE AMPLIFIER Maximum Power Output Front/Rear 50 W per channel 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% Continuous Power Output (RMS) Front/Rear total harmonic distortion 4 Ω (4 Ω to 8 Ω allowance) Load Impedance Equalizer Control Range Level ±12 dB...
  • Page 5 KW-AVX746A/KW-AVX746U,UT/KW-AVX646U,KW-AVX648UF AMPLIFIER Maximum Power Output Front/Rear 50 W per channel 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total Continuous Power Output (RMS) Front/Rear harmonic distortion 4 Ω (4 Ω to 8 Ω allowance) Load Impedance Equalizer Control Range Level ±12 dB...
  • Page 6: Precaution

    SECTION 1 PRECAUTION Safety Precautions (1) This design of this product contains special hardware and voltmeter. many circuits and components specially for safety purpos- Move the resistor connection to each exposed metal es. For continued protection, no changes should be made part, particularly any exposed metal part having a return to the original design unless authorized in writing by the path to the chassis, and measure the AC voltage across...
  • Page 7 Preventing static electricity Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged, can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs. 1.5.1 Grounding to prevent damage by static electricity Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as laser products.
  • Page 8 Important for laser products 1.CLASS 1 LASER PRODUCT 5.CAUTION : If safety switches malfunction, the laser is able to function. 2.CAUTION : (For U.S.A.) Visible and/or invisible class II laser radiation 6.CAUTION : Use of controls, adjustments or performance of when open.
  • Page 9: Specific Service Instructions

    SECTION 2 SPECIFIC SERVICE INSTRUCTIONS This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS. SECTION 3 DISASSEMBLY Main body (Used model: KD-AVX740) 3.1.2 Removing the Heat sink (See Fig.3) (1) Remove the three screws C and two screws D attaching 3.1.1 Removing the Front chassis (See Fig.1 and 2) the Heat sink.
  • Page 10 (2) Remove the two screws G attaching the Top chassis. (See (5) Remove the three screws K attaching the DVD mecha- Fig.6) nism. (See Fig.9) Fig.6 Fig.9 (3) Remove the one screw H attaching the Top chassis. (See Fig.7) 3.1.5 Removing the BT amp board (See Fig.10) (1) Disconnect the card wire from Main board connected to connector CN311...
  • Page 11 (2) Disconnect the card wire from Main board connected to 3.1.8 Removing the Center chassis (See Fig.15) connectors CN201 CN202 of the Sub amp board. (See (1) Remove the four screws R attaching the Center chassis. Fig.12) (3) Disconnect the Car cable connected to connector CN104 of the Main board.
  • Page 12 3.1.11 Removing the Panel-B board (See Fig.18) DVD mechanism assembly section (1) Disconnect the card wires from Panel-A board connected 3.2.1 Removing the Traverse mechanism assembly (See to connector CN603 of the Panel-B board. Fig.1 to 6) (2) Disconnect the card wires from Panel-B board connected (1) Solder the short land section on the flexible wire of pickup.
  • Page 13 (4) Remove the five screws A attaching the Top cover assembly. (See Fig.3) 3.2.2 Removing the Front end board (See Fig.7) (1) Remove the Motor wires from loading motor soldered to TP79 TP81 of the Front end board. (2) Remove the two screws B attaching the Front end board. TP81 TP79 Fig.7...
  • Page 14 (2) Remove the two screws C attaching the Gear base assembly. 3.2.7 Removing the Slide cam assembly (See Fig.13) (See Fig.10) (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.
  • Page 15 (2) Remove the A worm gear, M connect gear and M wheel 3.2.10 Removing the Roller assembly (See Fig.19) gear by sequentially. (See Fig.16) (1) Remove the Slit washer. (2) Remove the R middle gear. A worm gear (3) Remove the R connect gear. (4) Snap off the part a of the Roller assembly.
  • Page 16: Adjustment

    SECTION 4 ADJUSTMENT Service mode Standard measuring conditions Test instruments required for adjustment Power supply voltage DC14.4V(10.5 to 16V) Load impedance 20K ohm (2 Speakers connection) (1) Digital oscilloscope (100MHz) Output Level Line out 2.5V (Vol. MAX) (2) Digital tester (3) Test Disc Standard volume position (4) Extension cable :EXTXD001-50PF (CN403 --- CN105)
  • Page 17 Service mode 4.7.1 Set to Service Mode. (Multiplex push timing chart.) MENU Area A Area B [MENU] Key ON (HOLD) [Area A] Key ON TOUCH PANEL [Area B] Key ON Shift to Service Mode 4.7.2 Service mode menu SYS Vxxxx TUN:x TEMPERATURE SYS V: System micon version.
  • Page 18 DVD CHECK MODE xxxxxxxx DVDx1 JITTER MODE xxxx xxxx SEARCH & JITTER MONITOR DVDx1 PLAY NORMAL PLAY STOP EF OUT-TRACKING OFF EJECT EF IN-TRACKING OFF LOAD CD-LASER ON SLEEP DVD-LASER ON EEPROM DATA OSD Command Mechanism unit operation Indication contents NORMAL PLAY Start at normal speed Laser current value, jitter value...
  • Page 19: Troubleshooting

    SECTION 5 TROUBLESHOOTING 16PIN CORD DIAGRAM 5.1.1 Except Europe WH/BK GN/BK Green White GY/BK VI/BK Black Violet Light Blue Gray Blue Yellow LB/YL Brown BL/WH Orange OR/WH GN / BK VI / BK OR / WH LB / YL BL / WH WH / BK GY / BK (No.MA493<Rev.002>)1-19...
  • Page 20 5.1.2 For Europe White Green Black Violet Gray Light Blue Blue Yellow WH/BK GN/BK Brown GY/BK VI/BK Orange LB/YL BL/WH OR/WH VI/BK GY/BK WH/BK BL/WH OR/WH GN/BK RD 3 RD 1 RD 2 YL 1 YL 2 OR / WH BL / WH GN / BK VI / BK...
  • Page 21 (No.MA493<Rev.002>)1-21...
  • Page 22 Victor Company of Japan, Limited Mobile Entertainment Division 2967-3, Ishikawa-machi, Hachioji-shi, Tokyo, 192-8525, Japan (No.MA493<Rev.002>) Printed in Japan...