JVC KD-AVX2J User manual

SERVICE MANUAL
COPYRIGHT © 2006 Victor Company of Japan, Limited No.MA254
2006/4
DVD/CD RECEIVER
MA25420064
KD-AVX2J,KD-AVX2E,KD-AVX2EU,
KD-AVX2EE,KD-AVX2U,KD-AVX2UN,
KD-AVX2A
Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)
TABLE OF CONTENTS
1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-33
A

1-2 (No.MA254)
SPECIFICATION
AUDIO AMPLIFIER SECTION
Power Output Only the United States 20 W RMS ×4 Channels at 4 Ωand [< or =] 1% THD+N
Signal to Noise Ratio Only the United States 80 dBA (reference: 1 W into 4 Ω)
In countries other than the United States 70 dB
Maximum Power Output In other countries Front 50 W per channel
Rear 50 W per channel
Continuous Power Output
(RMS)
In other countries Front 20 W per channel into 4 Ω, 40 Hz to 20 000 Hz at no more than 0.8%
total harmonic distortion.
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 60 Hz, 150 Hz, 400 Hz, 1 kHz, 2.5 kHz, 6.3 kHz, 15 kHz
Level ±10 dB
Line-In Level/Impedance 1.5 V/20 kΩload
Line-Out Level/Impedance Only the United States and Southern Europe 2.5 V/20 kΩload (full scale)
In other countries 2.5 V/20 kΩload (full scale)
Output Impedance Only the United States and Southern Europe 1 kΩ
In other countries 2.5 V/20 kΩload (full scale)
Subwoofer-Out Level/
Impedance
Only the United States and Southern Europe 2.0 V/20 kΩload (full scale)
In other countries 2.5 V/20 kΩload (full scale)
Color System Only the United States NTSC
In Europe PAL
In other countries NTSC/PAL
Video Input (composite) 1 Vp-p/75 Ω
Video Output (composite) 1 Vp-p/75 Ω
Other Terminals Only the United States and Europe 2nd AUDIO OUT, CD changer, Steering wheel remote input (OE RE-
MOTE)
In other countries 2nd AUDIO OUT, CD changer
TUNER SECTION
Frequency Range FM Only the United States 87.5 MHz to 107.9 MHz (with channel interval set to 100 kHz or 200
kHz)
Only the United States 87.5 MHz to 108.0 MHz (with channel interval set to 50 kHz)
In other countries 87.5 MHz to 108.0 MHz
AM Only the United States 530 kHz to 1 710 kHz (with channel interval set to 10 kHz)
Only the United States 531 kHz to 1 602 kHz (with channel interval set to 9 kHz)
In Europe (MW) 522 kHz to 1 620 kHz
In Europe (LW) 144 kHz to 279 kHz
In other countries 531 kHz to 1 602 kHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0 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 35 dB
Capture Ratio 1.5 dB
AM Tuner ( In other countries ) Sensitivity 20 µV
Selectivity 35 dB
MW Tuner ( In Europe ) Sensitivity 20 µV
Selectivity 35 dB
LW Tuner ( In Europe ) Sensitivity 50 µV

(No.MA254)1-3
Design and specifications are subject to change without notice.
DVD/CD PLAYER SECTION
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of Channels 2 channels (stereo)
Frequency Response DVD fs=48 kHz 16 Hz to 22 000 Hz
DVD fs=192 kHz 16 Hz to 88 000 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
MP3 Max. Bit Rate 320 kbps
WMA Max. Bit Rate 320 kbps
MONITOR SECTION
Screen 3.5-inch wide liquid crystal panel
Number of Pixels 224 640 pixels
Drive Method TFT (Thin Film Transistor) active matrix format
Color system Only the United States NTSC
In Europe PAL
In other countries NTSC/PAL
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0°C to +40°C (32°F to 104°F)
Dimensions
(W ×H ×D)
Installation Size (approx.) 182 mm ×52 mm ×160 mm (7-3/16" ×2-1/16" ×6-5/16")
Panel Size (approx.) 188 mm ×58 mm ×12 mm (7-7/16" ×2-5/16" ×1/2")
Mass (approx.) 1.9 kg (4.2 lbs) (excluding accessories)

1-4 (No.MA254)
SECTION 1
PRECAUTIONS
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.MA254)1-5
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 flexible wire is disconnected from the connector on the pickup unit.
(If the flexible 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 flexible wire.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Mechanism control board
CN101
Flexible wire
Short-circuit points

1-6 (No.MA254)
1.5 Important for laser products
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
lock failed or defeated. Avoid direct exposure to beam.
3.CAUTION : There are no serviceable parts inside the
Laser Unit. Do not disassemble the Laser Unit. Replace
the complete Laser Unit if it malfunctions.
4.CAUTION : The CD,MD and DVD player uses 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
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
WARNING LABEL
CAUTION : Visible and Invisible
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
VARNING : Synlig och
osynling laserstrålning när
den öppnas och spärren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus
ohitettuna tai viallisena olet alttiina
näkyvälle ja näkymättömälle
lasersäteilylle. Vältä säteen
kohdistumista suoraan itseesi. (f)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
CLASS 1
LASER PRODUCT

(No.MA254)1-7
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

1-8 (No.MA254)
SECTION 3
DISASSEMBLY
3.1 Main body section
3.1.1 Removing the panel assembly
(See Fig.1)
(1) Push the button(detach) in the lower right part of the panel
assembly.
(2) Remove the panel assembly.
Fig.1
3.1.2 Removing the side heat sink
(See Fig.2)
Reference:
Remove the panel assembly as required.
(1) From the left side of the main body, remove the two screws
Aand two screws Battaching the side heat sink.
(2) Remove the side heat sink from the main body.
Fig.2
Panel assembly
Button(detach)
A
BSide heat sink

(No.MA254)1-9
3.1.3 Removing the top chassis assembly
(See Figs.3 to 6)
• Remove the panel assembly and side heat sink.
(1) From the top side of the main body, remove the two screws
Cattaching the top chassis assembly. (See Fig.3.)
(2) From the both sides of the main body, remove the two
screws Dattaching the top chassis assembly. (See Figs.4
and 5.)
(3) From the back side of the main body, remove the four
screws Eattaching the top chassis assembly. (See Fig.6.)
(4) Lift the top chassis assembly in the direction of the arrow.
(See Fig.6.)
(5) Take out the top chassis assembly from the main body.
Fig.3
Fig.4
Fig.5
Fig.6
Top chassis assembly
C
C
Bottom chassis assembly
Bottom chassis assembly
Top chassis assembly
D
Bottom chassis assembly
Top chassis assembly
D
Top chassis assembly
E

1-10 (No.MA254)
3.1.4 Removing the front chassis assembly
(See Fig.7 and 8)
• Remove the panel assembly, side heat sink and top chassis
assembly.
(1) From the both sides of the top chassis assembly, remove
the two screws Eattaching the front chassis assembly.
(See Fig.7 and 8.)
(2) Remove the front chassis assembly from the top chassis
assembly.
Fig.7
Fig.8
3.1.5 Removing the DVD mechanism assembly
(See Figs.9)
• Remove the panel assembly, side heat sink and top chassis
assembly.
Reference:
Remove the front chassis assembly as required.
(1) From the inside of the top chassis assembly, remove the
three screws Gattaching the DVD mechanism assembly
and take out the DVD mechanism assembly.
(2) From the side of the DVD mechanism assembly, remove
the double-stick tape fixing the insulator.
(3) Remove the insulator from the top chassis assembly.
Fig.9
F
Front chassis assembly
Top chassis assembly
Top chassis assembly
Front chassis assembly
F
DVD mechanism assembly
Top chassis assembly
Double stick tape
G
G
G

(No.MA254)1-11
3.1.6 Removing the connection control board
(See Fig.10)
• Remove the panel assembly, side heat sink, top chassis as-
sembly and DVD mechanism assembly.
(1) From the top side of the DVD mechanism assembly, re-
lease the lock of the connector CN965 on the connection
control board and disconnect the card wire.
(2) Remove the two screws Hattaching the connection control
board on the DVD mechanism assembly and remove the
connection control board.
Fig.10
DVD mechanism assembly
CN965
Connection control board
HH

1-12 (No.MA254)
3.1.7 Removing the rear bracket
(See Fig.11 to 13)
• Remove the panel assembly, side heat sink and top chassis
assembly.
(1) Remove the screw J, screw J', two screws Kand screw M
attaching the rear bracket. (See Fig. 11.)
Reference:
When attaching the screw J', attach the wire holder with
it as before.
(2) Remove the screw Nattaching the wire holder. (See
Fig.11.)
(3) Release the lock of the connector (CN301, CN311, CN361,
CN861, CN871, CN931) on the main board in an upward
direction. (See Fig.12.)
(4) Remove the car cable from the rear bracket. (See Fig.12.)
Note:
When attaching the car cable, do not touch the cable to
X31, IC31, TU1 and IC701 then pushing down all the ca-
ble to main board side by wire clamp. (See Fig.13.)
(5) Take out the rear bracket from the bottom chassis assem-
bly.
3.1.8 Removing the main board
(See Figs.12)
• Remove the panel assembly, side heat sink, top chassis as-
sembly and rear bracket.
(1) Release the lock of the connector CN962 on the main
board in an upward direction and disconnect the flexible
wire.
(2) Release the lock of the connector (CN881, CN891) and
disconnect the card wire.
(3) Remove the two screws Pattaching the main board to the
bottom chassis assembly.
(4) Take out the main board from the bottom chassis assem-
bly.
Fig.11
Fig.12
Fig.13
M
KJ' J
Rear bracketWire holder
N
Bottom chassis assembly
CN962
CN891
CN881
CN931
CN871 CN361 CN311 CN861
CN301
Main board
P
P
TU1
X31
IC31
Wire clamp
Main board Wire clamp
IC701

(No.MA254)1-13
3.1.9 Removing the front door mechanism assembly
(See Fig.14)
• Remove the front panel assembly, side heat sink, top chassis
assembly main board and rear bracket.
(1) From the top side of the bottom chassis assembly, remove
the screw Qattaching the FPC guide to the bottom chassis.
(2) Remove the five screws Rattaching the front door mecha-
nism assembly to the bottom chassis.
Reference:
When attaching the screws Qand R, apply a locking
agent them.
(3) Take out the front door mechanism assembly from the bot-
tom chassis.
Fig.14
3.1.10 Removing the panel A control board and panel panel B control board
(See Figs.15 and 16)
• Remove the panel assembly.
(1) From the back side of the panel assembly, remove the six
screws Sattaching the rear cover to the panel assembly.
(See Fig.15.)
(2) From the inside of the rear cover, release the lock of the
connector CN583 on the panel A control board and discon-
nect the card wire. (See Fig.16.)
(3) Remove the three screws Tattaching the panel B control
board and take out the panel B control board from the rear
cover. (See Fig.16.)
Note:
Do not lose the compression spring when taking out the panel
A control board. (See Fig.16.)
Fig.15
Fig.16
Bottom chassis
RR
Q
FPC guide
Front door mechanism assembly
S
S
Rear cove
r
Panel A control board
Panel B control board
CN583 Rear cover
T

1-14 (No.MA254)
3.2 DVD mechanism assembly
3.2.1 Removing the mechanism control board
(See Fig.1)
Caution:
Before disconnecting the flexible wire extending from the DVD
pickup, solder the short-circuit point on the flexible wire using
a grounding soldering iron. If you do not follow this instruction,
the DVD pickup may be damaged.
(1) Turn over the body, and solder the short-circuit points on
the flexible wire extending from the DVD pickup.
(2) Disconnect the flexible wire from connector CN101 on the
mechanism control board.
(3) Disconnect the card wire from connector CN201 on the
mechanism control board.
(4) Disconnect the flexible wire from connector CN202 on the
mechanism control board.
(5) Unsolder two soldered points aon the mechanism control
board and remove the wire extending from the feed motor.
(6) Remove the screw Aattaching the lug wire.
(7) Remove the two screws Band screw Cattaching the
mechanism control board.
Caution:
• As the flexible wire to be connected to CN101, make sure to
attach it to the mechanism control board using a double
tape.
• After reassembling, unsolder the short-circuit points.
Fig.1
Double tape
Feed motor
Mechanism control board
CN202
CN101
B
a
C
B
CN201
Flexible wire
Short-circuit points
A
Lug wire

(No.MA254)1-15
3.2.2 Removing the top cover
(See Fig.2)
(1) Remove the two screws Dattaching the top cover on the
back of the body.
(2) Remove the top cover upward.
Reference:
When reassembling, set part bof the top cover under the
bending part cof the chassis frame.
3.2.3 Removing the mechanism section
(See Fig.2 to 4)
• Remove the top cover.
(1) From the bottom of the body, remove the screw Eattaching
the lug wire. (See Fig.2.)
(2) Remove the two screws Fattaching the right and left stop-
pers on the front side. (See Fig.2.)
(3) Remove the two floating springs on the bottom of the body.
(See Fig.3.)
(4) Move the mechanism section upward and remove from the
chassis frame.
The three damper springs come off from the dampers.
(See Fig.4.)
Caution:
• When reassembling, reattach the damper spring to the
damper respectively and insert the three shafts on the bot-
tom of the mechanism to the dampers.
• Before inserting the shaft to the dampers, apply IPA to the
hole of damper.
Fig.2
Fig.3
Fig.4
D
Top cover
Stopper
Stopper
F
F
b
cE
Lug wire
D
Floating spring
Mechanism section
Damper (R)
(Purple)
Damper (F)
(Black)
Damper (F)
(Black)
Chassis frame
Damper SP.(F)
(Silver)
Damper SP.(F)
(Silver)
Damper SP.(R)
(Red)

1-16 (No.MA254)
3.2.4 Removing the clamper unit
(See Fig.5 to 7)
• Remove the top cover and the mechanism section.
(1) Remove the clamper2 spring on the bottom of the mecha-
nism section. (See Figs.5.and 6.)
(2) Release the part dof the clamper spring from the bending
part of the chassis base assembly. (See Fig.7.)
(3) Move the clamper unit in the direction of the arrow and turn.
Release the two joints eand f, then remove the clamper
unit upward. (See Fig.6.)
3.2.5 Reattaching the clamper unit
(See Fig.5 to 9)
(1) Attach the clamper spring to the clamper unit. (See Fig.8.)
(2) Move the clamper unit to set the side joints eand f to each
boss of the chassis base assembly. Make sure that part g
is inserted to the notch of the chassis base assembly. (See
Figs.5 and 9.)
(3) Move the part dof the clamper spring to the outside of the
bending part of the chassis base assembly. (See Fig.7.)
(4) Attach the clamper2 spring to the chassis base assembly.
(See Figs.5 and 6.)
Caution:
When reattaching, temporarily hook the end of the clamper
spring as shown in the figure to make the work easy. (See
Fig.8.)
Fig.5
Fig.6
Fig.7
Clamper unit
Clamper spring
Clamper2 spring
g
f
e
Chassis base assembly
Clamper2 spring
Chassis base assembly
Clamper spring
Chassis base assembly
d

(No.MA254)1-17
Fig.8
Fig.9
Clamper unit
Clamper spring
Notch
g
Clamper unit

1-18 (No.MA254)
3.2.6 Removing the front unit
(See Fig.10 to 12)
• Remove the top cover and the mechanism section.
(1) Disconnect the flexible wire from connector CN202 on the
mechanism control board at the bottom of the body. (See
Fig.10.)
(2) Remove the screw Gattaching the front unit on the top of
the body. (See Fig.11.)
(3) Move the front unit toward the front to release joint h, and
release two joints iand jon the right side of the chassis
base assembly. Then remove the front unit upward. (See
Figs.11 and 12.)
(4) Remove the two screws Hattaching the switch board. (See
Fig.12.)
Reference:
You can remove the switch board only without removing the
front unit.
Caution:
When reassembling, attach the flexible wire extending from
the switch board using the double tape. (See Figs.10 and 12.)
Fig.10
Fig.11
Fig.12
Mechanism control board
Flexible wire
CN202
Double tape
G
Front unit
h
h
Front unit
Switch board
j
G
H
i
Double tape

(No.MA254)1-19
3.2.7 Removing the loading arm assembly
(See Fig.13 , 14)
• Remove the top cover, the mechanism section and the front
unit.
(1) From the top of the body, move the loading arm assembly
from the front side upward, and release the bosses from
the right and left joints kand m of the chassis base assem-
bly.
(2) Release the boss from notch nof the connect arm on the
right side of the body, and release the boss from notch pof
the slide cam assembly on the left side.
Fig.13
Fig.14
kn
m
Loading arm assembly
k
n
m
Loading arm assembly
p
Side cam
assembly
Connect arm

1-20 (No.MA254)
3.2.8 Removing the rod (L)(R)/roller assembly
(See Fig.15 and 16)
• Remove the top cover, the mechanism section, the front unit
and the loading arm assembly.
(1) Release the rod (L) and (R) from the joints qat the bottom
of the loading arm assembly (See Fig.15.)
(2) Remove the roller assembly from the loading arm assem-
bly. (See Fig.16.)
(3) Remove the two collars and washer from the roller assem-
bly. (See Fig.16.)
Caution:
After attaching the loading arm assembly to the roller assem-
bly, attach the rod (L) and (R). Attach the rods to the right and
left collars of the roller. (See Fig.15.)
When reattaching the rod (L) and (R) to the loading arm as-
sembly, engage each joint as shown in Fig.15. As joints qof
the rod (L), let the rod through qbefore reattaching it.
Fig.15
Fig.16
q
q
qq
q
q
Rod(R)
Loading arm assembly
Rod(L)
Collar Collar
Rod(R) Rod(L)
Roller assembly
Washer
Collar
Collar
Rod(L)
Loading arm assembly
Rod(R)