JVC KW-ADV792J User manual

SERVICE MANUAL
COPYRIGHT © 2009 Victor Company of Japan, Limited No.MA443<Rev.001>
2009/4
DVD RECEIVER WITH MONITOR
MA443<Rev.001>20094SERVICE MANUAL
KW-ADV792J, KW-AVX624UI, KW-AVX625U,
KW-AVX625UT, KW-AVX625EU, KW-AVX626U,
KW-AVX626UT, KW-AVX626EU, KW-AVX626A,
KW-AVX720J, KW-AVX720E, KW-AVX720EE,
KW-AVX724UI, KW-AVX725U, KW-AVX725UN,
KW-AVX725UT, KW-AVX725EU, KW-AVX726U,
KW-AVX726UN, KW-AVX726UT, KW-AVX726EU,
KW-AVX726A, KW-AVX728UF
COPYRIGHT © 2009 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. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
except KW-AVX626/KW-AVX625/KW-AVX624only KW-AVX726/KW-AVX725 E,EE
only KW-ADV792/KW-AVX720J

1-2 (No.MA443<Rev.001>)
SPECIFICATION
KW-ADV792/KW-AVX720J
Design and specifications are subject to change without notice.
AMPLIFIER
Power Output 20 W RMS ×4 Channels at 4 Ωand < or = 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 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, 15 kHz
Level ±10 dB
Audio Output Level
LINE OUT (REAR) and SUBWOOFER
Line-Out Level/Impedance 2.5 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Color System NTSC
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Input LINE IN, VIDEO IN, Antenna input, USB input, Steering
wheel remote input
Output VIDEO OUT
Others CD changer, DIGITAL OUT (optical)
TUNER SECTION
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 20 µV
Selectivity 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 96 dB
Signal-to-Noise Ratio 98 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
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)
With trim plate and sleeve attached
Installation Size (approx.) 182 mm ×111 mm ×161 mm
(7-3/16” ×4-3/8” ×6-3/8”)
Panel Size (approx.) 188 mm ×117 mm ×22 mm
(7-7/16” ×4-5/8” ×7/8”)
Mass (approx.) 3.3 kg (7.3 lbs) (including trim plate and sleeve)

(No.MA443<Rev.001>)1-3
KW-AVX720E
Design and specifications are subject to change without notice.
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 1.0% total harmonic distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, 15 kHz
Level ±10 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level
LINE OUT (REAR) and SUBWOOFER
Line-Out Level/Impedance 2.5 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, Aerial input, USB input, Steering
wheel remote input
Output VIDEO OUT
Others CD changer, DIGITAL OUT (optical)
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 96 dB
Signal-to-Noise Ratio 98 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
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
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D)
With trim plate and sleeve attached
Installation Size (approx.) 182 mm ×111 mm ×161 mm
Panel Size (approx.) 188 mm ×117 mm ×22 mm
Mass (approx.) 3.3 kg (including trim plate and sleeve)

1-4 (No.MA443<Rev.001>)
KW-AVX720EE
Design and specifications are subject to change without notice.
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 1.0% total harmonic distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, 15 kHz
Level ±10 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level
LINE OUT (REAR) and SUBWOOFER
Line-Out Level/Impedance 2.5 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, Aerial input, USB input, Steering
wheel remote input
Output VIDEO OUT
Others CD changer, DIGITAL OUT (optical)
FM/AM TUNER
Frequency Range FM1/FM2 87.5 MHz to 108.0 MHz
FM3 65.0 MHz to 74.0 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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
USB
USB Standards USB 2.0 Full Speed
Data Transfer Rat 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
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
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D)
With trim plate and sleeve attached
Installation Size (approx.) 182 mm ×111 mm ×161 mm
Panel Size (approx.) 188 mm ×117 mm ×22 mm
Mass (approx.) 3.3 kg (including trim plate and sleeve)

(No.MA443<Rev.001>)1-5
KW-AVX726/KW-AVX725/KW-AVX626/KW-AVX625EU
Design and specifications are subject to change without notice.
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 1.0% total harmonic distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, 15 kHz
Level ±10 dB
Signal-to-Noise Ratio 70 dB
Audio Output LevelLINE OUT (REAR) and
SUBWOOFER (for KW-AVX726/KW-AVX725)
Line-Out Level/Impedance 2.5 V/20 kΩload (full scale)
Output Impedance 1 kΩ
Color System KW-AVX726/KW-AVX725 NTSC/PAL
KW-AVX626/KW-AVX625 PAL
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Input LINE IN, VIDEO IN, Aerial input
USB input (for KW-AVX726/KW-AVX725)
Output VIDEO OUT
Others CD changer, DIGITAL OUT (optical), POSITION OUT
FM/AM TUNER
Frequency Range FM 87.5 MHz to 108.0 MHz
AM KW-AVX726/KW-AVX725 (MW) 522 kHz to 1 620 kHz
(LW) 144 kHz to 279 kHz
KW-AVX626/KW-AVX625 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/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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
USB (for KW-AVX726/KW AVX725)
USB Standards USB 2.0 Full Speed
Data Transfer Rat 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
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
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D)
With trim plate and sleeve attached
Installation Size (approx.) 182 mm ×111 mm ×161 mm
Panel Size (approx.) 188 mm ×117 mm ×22 mm
Mass (approx.) 3.3 kg (including trim plate and sleeve)

1-6 (No.MA443<Rev.001>)
KW-AVX726/KW-AVX725/KW-AVX724/KW-AVX626/KW-AVX625/KW-AVX624 U/UN/UT/A/UI
Design and specifications are subject to change without notice.
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 1.0% total harmonic distortion
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Equalizer Control Range Frequencies 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, 15 kHz
Level ±10 dB
Signal-to-Noise Ratio 70 dB
Audio Output Level LINE OUT (REAR) and SUBWOOFER
(for KW-AVX726/KW-AVX725/KW-AVX724)
Line-Out Level/Impedance 2.5 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, Antenna input
USB input (for KW-AVX726/KW-AVX725/KW-AVX724)
Output VIDEO OUT
Others CD changer, DIGITAL OUT (optical), POSITION OUT
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 22 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
USB (for KW-AVX726/KW-AVX725/KW-AVX724)
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
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
Allowable Operating Temperature 0°C to +40°C
Dimensions (W ×H ×D) Installation Size (approx.) 178 mm ×100 mm ×160 mm
Panel Size (approx.) 184 mm ×112 mm ×23 mm
Mass (approx.) 2.7 kg

(No.MA443<Rev.001>)1-7
SECTION 1
PRECAUTION
1.1 Safety Precautions
(1) This design of this product contains special hardware and
many circuits and components specially for safety purpos-
es. For continued protection, no changes should be made
to the original design unless authorized in writing by the
manufacturer. Replacement parts must be identical to
those used in the original circuits. Services should be per-
formed by qualified personnel only.
(2) Alterations of the design or circuitry of the product should
not be made. Any design alterations of the product should
not be made. Any design alterations or additions will void
the manufacturers warranty and will further relieve the
manufacture of responsibility for personal injury or property
damage resulting therefrom.
(3) Many electrical and mechanical parts in the products have
special safety-related characteristics. These characteris-
tics are often not evident from visual inspection nor can the
protection afforded by them necessarily be obtained by us-
ing replacement components rated for higher voltage, watt-
age, etc. Replacement parts which have these special
safety characteristics are identified in the Parts List of Ser-
vice Manual. Electrical components having such features
are identified by shading on the schematics and by ( ) on
the Parts List in the Service Manual. The use of a substitute
replacement which does not have the same safety charac-
teristics as the recommended replacement parts shown in
the Parts List of Service Manual may create shock, fire, or
other hazards.
(4) The leads in the products are routed and dressed with ties,
clamps, tubings, barriers and the like to be separated from
live parts, high temperature parts, moving parts and/or
sharp edges for the prevention of electric shock and fire
hazard. When service is required, the original lead routing
and dress should be observed, and it should be confirmed
that they have been returned to normal, after reassem-
bling.
(5) Leakage shock hazard testing
After reassembling the product, always perform an isola-
tion check on the exposed metal parts of the product (an-
tenna terminals, knobs, metal cabinet, screw heads,
headphone 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 good earth ground. Any leakage cur-
rent must not exceed 0.5mA AC (r.m.s.).
• Alternate check method
Plug the AC line cord directly into the AC outlet. Use an
AC voltmeter having, 1,000Ωper volt or more sensitivity
in the following manner. Connect a 1,500Ω10W resistor
paralleled by a 0.15µF AC-type capacitor between an
exposed metal part and a known good earth ground.
Measure the AC voltage across the resistor with the AC
voltmeter.
Move the resistor connection to each exposed metal
part, particularly any exposed metal part having a return
path to the chassis, and measure the AC voltage across
the resistor. Now, reverse the plug in the AC outlet and
repeat each measurement. Voltage measured any must
not exceed 0.75 V AC (r.m.s.). This corresponds to 0.5
mA AC (r.m.s.).
1.2 Warning
(1) This equipment has been designed and manufactured to
meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that
these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant
safety standards.
(4) It is essential that safety critical components are replaced
by approved parts.
(5) If mains voltage selector is provided, check setting for local
voltage.
1.3 Caution
Burrs formed during molding may be left over on some parts
of the chassis.
Therefore, pay attention to such burrs in the case of pre-
forming repair of this system.
1.4 Critical parts for safety
In regard with component parts appearing on the silk-screen
printed side (parts side) of the PWB diagrams, the parts that are
printed over with black such as the resistor ( ), diode ( )
and ICP ( ) or identified by the " " mark nearby are critical
for safety. When replacing them, be sure to use the parts of the
same type and rating as specified by the manufacturer.
(This regulation dose not Except the J and C version)
Good earth ground
Place this
probe on
each exposed
metal part.
AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)
1500 10W
0.15 F AC TYPE

1-8 (No.MA443<Rev.001>)
1.5 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.
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.
1.6 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 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.7 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the pickup unit.
• Apply solder to the short land sections before the card wire is disconnected from the connecto on the servo board. (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 sections after connecting the card wire.
1M
Conductive material
(conductive sheet) or iron palate
(caption)
Anti-static wrist strap
Solder short part

(No.MA443<Rev.001>)1-9
1.8 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

1-10 (No.MA443<Rev.001>)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
SECTION 3
DISASSEMBLY
3.1 Main body (Used figure are KW-AVX720J)
3.1.1 Removing the Front panel (See Fig.1 to 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 two screws Battaching the FPC cover. (See
Fig.3)
Fig.3
(4) Disconnect the FPC from Front panel connected to con-
nector CN701 of the Main board. (See Fig.4)
Fig.4
hole a
A
B
CN701

(No.MA443<Rev.001>)1-11
3.1.2 Removing the Heat sink (See Fig.5)
(1) Remove the four screws Cand two screws Dattaching the
Heat sink.
Fig.5
3.1.3 Removing the Rear bracket (A) (See Fig.6, 7)
(1) Remove the three screws Eattaching the Rear heat sink.
(See Fig.6)
(2) Remove the six screws F, two screws G, one screw Hand
one screw Jattaching the Rear bracket (B). (See Fig.6)
(3) Remove the one screw Kattaching the Subwoofer cable.
(See Fig.6)
(4) Remove the seven screws Lattaching the Rear bracket
(A). (See Fig.6)
Fig.6
(5) Disconnect the connector wire from FAN connected to con-
nector CN604 of the Sub board. (See Fig.7)
Fig.7
3.1.4 Removing the Front chassis (See Fig.8, 9)
(1) Remove the three screws Mattaching the Front chassis.
(See Fig.8)
Fig.8
(2) Remove the four screws Nattaching the both side of the
Front chassis. (See Fig.9)
(3) Disengage two hooks bengaged both side of the Front
chassis. (See Fig.9)
Fig.9
3.1.5 Removing the Top chassis (See Fig.10, 11)
(1) Remove the two screws Pattaching the Top chassis. (See
Fig.10)
Fig.10
CDC
C
FKLFJ
EGHLL
CN604
M
N
N
hook b
P

1-12 (No.MA443<Rev.001>)
(2) Remove the two screws Qattaching the Top chassis. (See
Fig.11)
Fig.11
3.1.6 Removing the Main board (See Fig.12)
(1) Disconnect the connector wire from Door switch board con-
nected to connector CN961 of the Main board.
(2) Remove the four screws Rattaching the Main board.
Fig.12
3.1.7 Removing the DVD mechanism (See Fig.13 to 16)
(1) Remove the four screws Sattaching the Sub board brack-
et. (See Fig.13)
Fig.13
(2) Disconnect the card wire from Sub board connected to
connector CN403 of the Front end board. (See Fig.14)
Fig.14
Q
R
R
CN961
S
S
CN403

(No.MA443<Rev.001>)1-13
(3) Remove the three screws Tattaching the Support bracket.
(See Fig.15)
Fig.15
(4) Remove the three screws Uattaching the DVD mecha-
nism. (See Fig.16)
Fig.16
3.2 Monitor section
3.2.1 Removing the Front bracket (See Fig.1)
(1) Remove the two screws Aattaching the FPC cover.
(2) Remove the four screws Battaching the Front bracket.
(3) Remove the two screws Cattaching the Front bracket.
Fig.1
3.2.2 Removing the Panel board (See Fig.2)
(1) Remove solder of hook aand straighten it.
(2) Disconnect the connector wire from LCD module connect-
ed to connector CN607 of the Panel board.
(3) Disconnect the FPC connected to connector CN601,
CN602 and CN606 of the Panel board.
(4) Remove the four screws Dattaching the Panel board.
Fig.2
3.2.3 Removing the LCD module (See Fig.3)
(1) Remove the six screws Eattaching the Panel bracket.
Fig.3
T
U
U
ABB
C
DD
DD
CN601 CN602CN606
CN607
hook
a
E

1-14 (No.MA443<Rev.001>)
3.3 DVD mechanism assembly section
3.3.1 Removing the Traverse mechanism 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 mechanism assembly, re-
move the solder from the short land section after connection
the flexible wire to the connector CN101 on the Front end
board.
Fig.1
(2) Voltage supply to TP79 and TP81 approx DC 3.0V until
Clamper is shift to loading complete position. (See Fig.2)
(3) Disconnect the flexible wires from Traverse mechanism assembly
connected to connector CN101 and CN164 of the Front end
board. (See Fig.2)
Fig.2
(4) Remove the five screws Aattaching the Top cover assembly.
(See Fig.3)
Fig.3
(5) From the bottom side, disconnect the connector wire from
Top cover assembly connected to connector CN2 of the
Front end board. (See Fig.4)
Fig.4
(6) From the bottom side, remove the spring from Traverse
mechanism assembly. (See Fig.5)
Fig.5
Solder short part
CENTER
R21
D- DGND_7
R312
R317
WOOFER
TP67
R357
TP79 TP81
TP92
Voltage supply
position
CN164
CN101
TP81
TP79
A
CN2

(No.MA443<Rev.001>)1-15
(7) From the top side, pull up the traverse mechanism and disengage
three dumper positions. (See Fig.6)
Fig.6
3.3.2 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 Battaching the Front end board.
Fig.7
3.3.3 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 athen hook b.
Fig.8
3.3.4 Removing the Gear base assembly (See Fig.9, 10)
(1) Remove the Loading arm spring L. (See Fig.9)
Fig.9
Dumper
(same color spring)
Dumper
(Different color spring)
B
B
TP79
TP81
Loading arm
assembly
Loading arm spring L
hook a
hook b
Loading arm
spring L

1-16 (No.MA443<Rev.001>)
(2) Remove the two screws Cattaching the Gear base assembly.
(See Fig.10)
Fig.10
3.3.5 Removing the Loading arm holder. (See Fig.11)
(1) Remove the two screws Dattaching the Loading arm holder.
(2) Remove the Loading arm spring R.
Fig.11
3.3.6 Removing the Loading moor assembly (See Fig.12)
(1) Remove the three screws Eattaching the Loading motor
assembly.
Fig.12
3.3.7 Removing 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
3.3.8 Removing the Photo board (See Fig.14)
(1) Pressing the hook cand then slide to backward (slide to the
arrow side) the Disc plate.
(2) Remove the one screw Fattaching the Photo board.
Fig.14
3.3.9 Removing the Loading motor (See Fig.15 to 18)
(1) Remove the A wheel gear. (See Fig.15)
Fig.15
C
D
Loading arm
spring R
Loading arm
holder
E
Slide cam assembly
Slide cam spring
hook c
hook c
F
Photo board
A Wheel gea
r

(No.MA443<Rev.001>)1-17
(2) Remove the A worm gear, M connect gear and M wheel
gear by sequentially. (See Fig.16)
Fig.16
(3) Remove the two screws Gattaching the Loading motor.
(Se Fig.17)
Fig.17
(4) When attaching the Loading motor, motor wire should arrange
to figure. (See Fig.18)
Fig.18
3.3.10 Removing the Roller assembly (See Fig.19)
(1) Remove the Slit washer.
(2) Remove the R middle gear.
(3) Remove the R connect gear.
(4) Snap off the part aof the Roller assembly.
(5) Lift up the part bof 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
3.3.11 Removing the Roller (See Fig.20)
(1) Remove the Slit washer.
(2) Pull out the Roller shaft.
CAUTION:
When reattach the Roller shaft, Slit washer should be change
new part.
Fig.20
A worm gear
M connect gear
M wheel gear
G
Wire arrangement
Direction
Slit washer
R connect gear
R collar R
R middle gear
part b
part a
part c
keep direction
slit
small side
keep direction
slit

1-18 (No.MA443<Rev.001>)

(No.MA443<Rev.001>)1-19
SECTION 4
ADJUSTMENT
4.1 Test instruments required for adjustment
(1) Digital oscilloscope (100MHz)
(2) Digital tester
(3) Test Disc
(4) Extension cable : EXTXD001-50PF
EXTDV002-30P
EXTCN001-6P
(5) Extension stud : STDV001-3P
4.2 Standard measuring conditions
Power supply voltage DC14.4V(10.5 to 16V)
Load impedance 20K ohm (2 Speakers connection)
Output Level Line out 2.5V (Vol. MAX)
4.3 Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
4.4 Dummy load
Exclusive dummy load should be used for AM,and FM.
For FM dummy load, there is a loss of 6dB between SSG out-
put and antenna input.
The loss of 6dB need not be considered sincedirect reading of
figures are applied in this working standard.
4.5 How to connect the extension cable for adjusting
Caution:
Be sure to attach the heat sink and rear bracket onto the power amplifier IC and regulator IC respectively, before supply the power.
If voltage is applied without attaching these parts, the power amplifier IC and regulator IC will be destroyed by heat.
CN704
CN701
CN961
EXTXD001-50PF
CN403
CN803
CN811
EXTDV002-30P
Original
cable
EXTCN001-6P
CN851
STDV001-3P

1-20 (No.MA443<Rev.001>)
4.6 Service mode
4.6.1 Button position
4.6.2 Service mode 1 (Indication of a service mode 1 is nothing.)
UP Button
[STANDBY/ON
ATTENUATOR]
[DISP] [VOL] [MENU TP/PTY] [SOURCE] [OPEN]
REW Button FF Button
TOUCH PANEL
[Exit][Back]
ENTER
DOWN Button
Keep this state more 2 seconds
while continuing pressing the
[STANDBY/ON ATTENUATOR] button
and [OPEN] button sequentially.
Screen indication
NO EJECT?
EMERGENCY EJECT?
Exchanging it operate a menu of a service mode with the [UP] button
and [DOWN] button. Operate choice of a menu with a [ENTER] button.
*1 : When an [ENTER] button is pushed in NO EJECT indication, it is set
by an EJECT prohibition mode.
When an [ENTER] button is pushed in EJECT OK indication, it is set
by a normal mode.
*2 : Forced EJECT movement
A screen becomes normal indication after an [ENTER] button was pushed.
*1
*2