JVC KW-ADV793J User manual

SERVICE MANUAL
COPYRIGHT © 2010 Victor Company of Japan, Limited No.MA473<Rev.002>
2010/6
DVD RECEIVER WITH MONITOR
MA473<Rev.002>20106SERVICE MANUAL
KW-ADV793J, KW-AVX730E, KW-AVX730EE, KW-AVX730J,
KW-AVX735EU, KW-AVX735U, KW-AVX735UN, KW-AVX736A,
KW-AVX736EU, KW-AVX736U, KW-AVX736UN, KW-AVX736UT,
KW-AVX736UW, KW-AVX738JW, KW-AVX830E, KW-AVX830J,
KW-AVX835EU, KW-AVX835U, KW-AVX835UN, KW-AVX836A,
KW-AVX836EU, KW-AVX836U, KW-AVX836UN, KW-AVX836UT,
KW-AVX836UW, KW-AVX838JW, KW-AVX838UF
COPYRIGHT © 2010 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)
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-31
Only for KW-AVX830J/
KW-ADV793/KW-AVX730J
Only for E/EU
Except J/JW
Only for J/JW

1-2 (No.MA473<Rev.002>)
SPECIFICATION
* Only for KW-AVX838/KW-AVX830.
Design and specifications are subject to change without notice.
KW-AVX838/KW-AVX830/KW-ADV793/KW-AVX738/KW-AVX730 J/JW
AMPLIFIER
Power Output 20 W RMS ×4 Channels at 4 Ωand < = 1% THD+N
Signal-to-Noise Ratio 80 dBA (reference: 1 W into 4 Ω)
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies Low: 60 Hz, 80 Hz, 100 Hz, 200 Hz
Mid: 500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz
High: 10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz
Level ±12 dB
Audio Output Level
FRONT OUT, REAR OUT, SUBWOOFER OUT
Line-Out Level/Impedance 5 V/20 kΩload (full scale), 2.5 V20 kΩload (full scale) for KW-AVX730
Output Impedance 1 kΩ
Color System NTSC
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Input LINE IN, VIDEO IN, CAMERA IN, USB input, MIC IN*, Antenna input
Output 2nd AUDIO OUT*
Others Expansion port, OE REMOTE
FM/AM TUNER
Frequency Range FM with channel interval set to 100 kHz or 200 kHz 87.5 MHz to 107.9 MHz
with channel interval set to 50 kHz 87.5 MHz to 108.0 MHz
AM with channel interval set to 10 kHz 530 kHz to 1 710 kHz
with channel interval set to 9 kHz 531 kHz to 1 602 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo 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 Mbps
Low Speed Maximum 1.5 Mbps
Compatible Device Mass storage class
Compatible File System FAT 32/16/12
Max. Current DC 5 V 500 mA
BLUETOOTH (Only for KW-AVX838/KW-AVX830)
Version Bluetooth 2.0 certified
Output Power +4 dBm Max. (Power class 2)
Service Area Within 10 m (10.9 yd)
Profile HFP (Hands-Free Profile) 1.5
OPP (Object Push Profile) 1.1
A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio/Video Remote Control Profile) 1.3
MONITOR
Screen Size 7 inch wide liquid crystal display
Number of Pixel 336 960 pixels: 480 ×3 (horizontal) ×234 (vertical)
Drive Method TFT (Thin Film Transistor) active matrix format
Color System NTSC/PAL
Aspect Ratio 16:9 (wide)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Storage Temperature -10°C to +60°C (14°F to 140°F)
Allowable Operating Temperature 0°C to +40°C (32°F to 104°F)
Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×111 mm ×160 mm (7-3/16” ×4-3/8” ×6-5/16”)
Panel Size (approx.) 188 mm ×117 mm ×10 mm (7-7/16” ×4-5/8” ×7/16”)
Mass (approx.) 2.8 kg (6.2 lbs) (including the Trim plate and Sleeve)

(No.MA473<Rev.002>)1-3
* Only for KW-AVX836/KW-AVX835
Design and specifications are subject to change without notice.
KW-AVX836/KW-AVX835/KW-AVX736/KW-AVX735 Europe
AMPLIFIER
Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output (RMS) Front/Rear 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total harmonic
distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies Low: 60 Hz, 80 Hz, 100 Hz, 200 Hz
Mid: 500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz
High: 10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz
Level ±12 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level
FRONT OUT, REAR OUT, SUBWOOFER OUT
Line-Out Level/Impedance 5 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Color System NTSC/PAL
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Input LINE IN, VIDEO IN, USB input, MIC IN*, Aerial input
Output 2nd AUDIO OUT*
Others OE REMOTE, RGB input
FM/AM TUNER
Frequency Range FM 87.5 MHz to 108.0 MHz
AM (MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 40 dB
MW Tuner Sensitivity/Selectivity 20 µV/40 dB
LW Tuner Sensitivity 50 µV
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 Mbps
Low Speed Maximum 1.5 Mbps
Compatible Device Mass storage class
Compatible File System FAT 32/16/12
Max. Current DC 5 V 500 mA
BLUETOOTH (Only for KW-AVX836/KW-AVX835)
Version Bluetooth 2.0 certified
Output Power +4 dBm Max. (Power class 2)
Service Area Within 10 m
Profile HFP (Hands-Free Profile) 1.5
OPP (Object Push Profile) 1.1
A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio/Video Remote Control Profile) 1.3
MONITOR
Screen Size 7 inch wide liquid crystal display
Number of Pixel 336 960 pixels: 480 ×3 (horizontal) ×234 (vertical)
Drive Method TFT (Thin Film Transistor) active matrix format
Color System PAL/NTSC
Aspect Ratio 16:9 (wide)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Storage Temperature -10°C to +60°C
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×111 mm ×160 mm
Panel Size (approx.) 188 mm ×117 mm ×10 mm
Mass (approx.) 2.8 kg (including the Trim plate and Sleeve)

1-4 (No.MA473<Rev.002>)
*1 Only for KW-AVX830. *2 Only for KW-AVX730.
Design and specifications are subject to change without notice.
KW-AVX830/KW-AVX730 Europe
AMPLIFIER
Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output (RMS) Front/Rear 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8% total harmonic
distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies Low: 60 Hz, 80 Hz, 100 Hz, 200 Hz
Mid: 500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz
High: 10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz
Level ±12 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level
FRONT OUT, REAR OUT, SUBWOOFER OUT
Line-Out Level/Impedance 5 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Color System PAL
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Input LINE IN, VIDEO IN, CAMERA IN*1, USB input, MIC IN*1, Aerial input
Output 2nd AUDIO OUT*1
Others Expansion port*2, OE REMOTE
FM/AM TUNER
Frequency Range FM 87.5 MHz to 108.0 MHz
AM (MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 40 dB
MW Tuner Sensitivity/Selectivity 20 µV/40 dB
LW Tuner Sensitivity 50 µV
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 Mbps
Low Speed Maximum 1.5 Mbps
Compatible Device Mass storage class
Compatible File System FAT 32/16/12
Max. Current DC 5 V 500 mA
BLUETOOTH (Only for KW-AVX830)
Version Bluetooth 2.0 certified
Output Power +4 dBm Max. (Power class 2)
Service Area Within 10 m
Profile HFP (Hands-Free Profile) 1.5
OPP (Object Push Profile) 1.1
A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio/Video Remote Control Profile) 1.3
MONITOR
Screen Size 7 inch wide liquid crystal display
Number of Pixel 336 960 pixels: 480 ×3 (horizontal) ×234 (vertical)
Drive Method TFT (Thin Film Transistor) active matrix format
Color System PAL/NTSC
Aspect Ratio 16:9 (wide)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Storage Temperature -10°C to +60°C
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D) Installation Size (approx.) 182 mm ×111 mm ×160 mm
Panel Size (approx.) 188 mm ×117 mm ×10 mm
Mass (approx.) 2.8 kg (including the Trim plate and Sleeve)

(No.MA473<Rev.002>)1-5
* Only for KW-AVX836/KW-AVX835.
Design and specifications are subject to change without notice.
KW-AVX836/KW-AVX835/KW-AVX736/KW-AVX735 Asia & Oceania
AMPLIFIER
Maximum Power Output Front/Rear 50 W per channel
Continuous Power Output (RMS) Front/Rear 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8%
total harmonic distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies Low: 60 Hz, 80 Hz, 100 Hz, 200 Hz
Mid: 500 Hz, 1 kHz, 1.5 kHz, 2.5 kHz
High: 10 kHz, 12.5 kHz, 15 kHz, 17.5 kHz
Level ±12 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level
FRONT OUT, REAR OUT, SUBWOOFER OUT
Line-Out Level/Impedance 5 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Color System NTSC/PAL
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Input LINE IN, VIDEO IN, USB input, MIC IN*, Antenna input
Output 2nd AUDIO OUT*
Others OE REMOTE, RGB input
FM/AM TUNER
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 602 kHz
FM Tuner Usable Sensitivity 9.3 dBf (0.8 µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 µV/75 Ω
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo 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 Mbps
Low Speed Maximum 1.5 Mbps
Compatible Device Mass storage class
Compatible File System FAT 32/16/12
Max. Current DC 5 V 500 mA
BLUETOOTH (Only for KW-AVX836/KW-AVX835)
Version Bluetooth 2.0 certified
Output Power +4 dBm Max. (Power class 2)
Service Area Within 10 m
Profile HFP (Hands-Free Profile) 1.5
OPP (Object Push Profile) 1.1
A2DP (Advanced Audio Distribution Profile) 1.2
AVRCP (Audio/Video Remote Control Profile) 1.3
Max. Current DC 5 V 54.3 mA
MONITOR
Screen Size 7 inch wide liquid crystal display
Number of Pixel 336 960 pixels: 480 ×3 (horizontal) ×234 (vertical)
Drive Method TFT (Thin Film Transistor) active matrix format
Color System PAL/NTSC
Aspect Ratio 16:9 (wide)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Storage Temperature -10°C to +60°C
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D) Installation Size (approx.) 180 mm ×100 mm ×160 mm
Panel Size (approx.) 171 mm ×97 mm ×28 mm
Mass (approx.) 2.6 kg

1-6 (No.MA473<Rev.002>)
SECTION 1
PRECAUTION
1.1 Safety Precautions
!Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.

(No.MA473<Rev.002>)1-7
1.2 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.
1.2.1 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.
Be careful to use proper grounding in the area where repairs are being performed.
(1) Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over it before placing the
traverse unit (optical pickup) on it.
(2) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(3) Handling the optical pickup
• In order to maintain quality during 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.)
• Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power source can easily
destroy the laser diode.
1.3 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 details, refer to the
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
time when attaching it to the connector.
(3) Handle the flexible cable carefully as it may break when subjected to strong force.
(4) It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land before the card wire is disconnected from the connector on the pickup unit.
(If the card wire is disconnected without applying solder, the pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the card wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Solder short part

1-8 (No.MA473<Rev.002>)
1.5 Important for laser products
1.CLASS 1 LASER PRODUCT
2.CAUTION :
(For U.S.A.) Visible and/or invisible class II laser radiation
when open. Do not stare into beam.
(Others) Visible and/or invisible class 1M laser radiation
when open. Do not view directly with optical instruments.
3.CAUTION : Visible and/or invisible laser radiation when
open and inter lock failed or defeated. Avoid direct
exposure to beam.
4.CAUTION : This laser product 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 those specified here in may result in
hazardous radiation exposure.
REPRODUCTION AND POSITION OF LABELS and PRINT
!Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
WARNING LABEL and PRINT

(No.MA473<Rev.002>)1-9
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-10 (No.MA473<Rev.002>)
SECTION 3
DISASSEMBLY
3.1 Main body (Used model: KW-AVX810)
3.1.1 Removing the Front panel (See Fig.1, 2, 3, 4)
(1) From the bottom side of the main body, insert the screw-
driver to hole of the third gear from hole aof the bottom
chassis, and then turn the gear to clockwise until Front
panel comes up. (See Fig.1)
Fig.1
(2) Remove the two screws Aattaching the both side of the
Front panel. (See Fig.2)
Fig.2
(3) Remove the three screws Battaching the FPC cover. (See
Fig.3)
Fig.3
(4) Disconnect the FPC from Front panel connected to con-
nectors CN106 and CN107 of the Main board. (See Fig.4)
Fig.4
3.1.2 Removing the Heat sink (See Fig.5)
(1) Remove the three screws C and two screws Dattaching
the Heat sink.
Fig.5
3.1.3 Removing the Rear heat sink (See Fig 6)
(1) Remove the three screws Eattaching the Rear heat sink.
Fig.6
hole a
A
B
CN106CN107
C
D
E