JVC KW-XC55 Service Manual
49784200310
SERVICE MANUAL
CD/CASSETTE RECEIVER
KW-XC55
Area suffix
UN ----------------------------Asean
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
No.49784
2003/10
1.1 Safety Precautions
SECTION 1
PRECAUTION
!
!
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.
1-2 (No.49784)
1.2 Preventing static electricity
Short round
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 CD players.
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 conducti ve 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.
(caption)
Anti-static wrist strap
1M
Conductive material
(conductive sheet) or iron plate
(3) Handling the optical pickup
• In order to maintain quality during transport and before insta llation, both sides of the lase r diode on the replacement o ptical
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 CD pickup unit.
• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CD pickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
(No.49784)1-3
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-4 (No.49784)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the front panel assembly
(See Fig.1, 2)
(1) From the both side of the main body, remove the four
screws A attaching the front panel assembly. (See Figs.1,
2)
(2) Release the four joints a using a screwdriver, then remove
the front panel assembly toward the front. (See Figs.1, 2)
3.1.2 Removing the rear bracket
(See Figs.3)
• Prior to performing the following procedure, remove the front
panel assembly as required.
(1) From the back side of the main body, remove the ten
screws B, screw C and screw D attaching the rear bracket.
(2) Take out the rear bracket.
A
A
Front panel assembly
Joints a
B
B
Front panel assembly
Joints a
Fig.1
A
A
Fig.2
BC
D
3.1.3 Removing the heat sink
(See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly as required.
(1) From the left side of the main body, remove the two screws
E and three screws F attaching the heat sink.
B
F
Fig.3
Fig.4
Heat sink
Rear braket
FFE
(No.49784)1-5
3.1.4 Removing the top chassis assembly and bottom chassis assembly
(See Fig.5 to 7)
• Prior to performing the following procedures, remove the front
panel assembly, rear bracket and heat sink.
(1) From the back side of the main body, disconnect the ca rd
wire from the connector CN702
top chassis assembly. (See Fig.5)
(2) From the both side of the main body, remove the three
screws G attaching the bottom chassis assembly. (See
Figs.6, 7)
(3) Release the four joints b using a screwdriver, and then
remove the top chassis assembly upward from the bottom
chassis assembly. (See Figs.6, 7)
on the main board in the
CN702
Card wire Main board
Fig.5
Top chassis assembly
G
3.1.5 Removing the main board
(See Fig.8)
• Prior to performing the following procedures, remove the front
panel assembly, rear bracket, heat sink, top chassis assembly
and bottom chassis assembly.
(1) From the bottom side of the top chassis assembly, remove
the three screws H attaching the main board.
(2) Disconnect the connector CN501
take out the main board from the top chassis assembly.
Reference:
• When attaching the main board, joint the hole of the main
board in joint c of the top chassis assembly.
on the main board, and
Bottom chassis assemblyGJoints b
Top chassis assembly
Joints b
Top chassis assembly
H
Fig.6
G
Bottom chassis assembly
Fig.7
Main board
CN601
1-6 (No.49784)
H
H
Joints c
Fig.8
3.1.6 Removing the CD mechanism assembly
(See Fig.9)
• Prior to performing the following procedures, remove the front
panel assembly, rear bracket, heat sink, top chassis assembly,
main board and CD mecha control board.
(1) Remove the three screws J attach ing the CD mechanism
assembly to the top chassis assembly.
Reference:
• When attaching the CD mechanism assembly, joint the hole
of the CD mechanism assembly in boss d and boss e of the
top chassis assembly.
CD mechanism assembly
J
J
3.1.7 Removing the changer control board
(See Fig.10, 11)
• Prior to performing the following procedures, remove the front
panel assembly, rear bracket, heat sink, top chassis assembly
and bottom chassis assembly.
(1) From the back side of the bottom chassis assembly,
disconnect the card wire from the connector CN972
changer control board. (See Fig.10)
(2) From the top side of the bottom chassis assembly, remove
the two screws K attaching the changer control board. (See
Fig.11)
Reference:
• When attaching the changer control board, joint the hole o f
the changer control board in joints f of the bottom chassis
assembly.
on the
Boss d
Changer control board
Bottom chassis assembly
Bottom chassis assembly
Boss e
Top chassis assembly
J
Fig.9
CN972
Card wire
Fig.10
Cassette mechanism assembly
3.1.8 Removing the mech a control board
(See Fig.12)
• Prior to performing the following procedures, remove the front
panel assembly, rear bracket, heat sink, bottom chassis
assembly and changer control board.
(1) From the back side of the bottom chassis assembly,
remove the screw L attaching the mecha control board,
and release the joints g from the bottom chassis assembly.
(2) Disconnect the wire from the connector CJ402
card wire from the connector CN403
board.
Reference:
• When attaching the mecha control board, joint the ho le of
the mecha control board in joints i of the bottom chassis
assembly.
on the mecha control
and the
K
Changer control board
L
Top chassis assembly Mecha control board
CN403CJ402
K
Joint f
Fig.11
Joint g
Fig.12
(No.49784)1-7
3.1.9 Removing the cassette mechanism assembly
(See Fig.13)
• Prior to performing the following procedures, remove the front
panel assembly, rear bracket, heat sink, bottom chassis
assembly, changer control board and mecha control board.
(1) From the bottom side of the bottom chassis assembly,
remove the four screws M attaching the cassette
mechanism assembly to the bottom chassis assembly.
M
3.1.10 Removing the LCD board
(See Fig.14)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) From the back side of front panel assembly, remove the
twelve screws N attaching the LCD board, and then tu rn
over the LCD board.
(2) From the reverse side of LCD board, remove the solders
from the soldered points h attaching the wire.
3.1.11 Removing the switch board
(See Fig.15)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) From the back side of front panel assembly, remove the
five screws P attaching the switch board.
(2) Release the claws i attaching the swi tch board, and then
turn over the switch board.
(3) From the reverse side of switch board, remove the solders
from the soldered points j attaching the wire.
M
Cassette mechanism assembly
Fig.13
Front panel assembly
N
LCD board
Front panel assembly
Solder points h
Fig.14
Bottom chassis assembly
NN
N
Solder points j
1-8 (No.49784)
P
Claws i
Fig.15
P
Switch board
3.2 CD mechanism assembly
3.2.1 Removing the CD mechanism control board
(See Fig.1 and 2)
(1) Unsolder the part a an d b on the CD mechanism control
board.
(2) Remove the stator fixing the CD mechanism control board
and the damper bracket (To remove the stator smoothly,
pick up the center part).
(3) Remove the screw A attaching the CD mechanism control
board.
(4) Remove the CD mechanism control board in the direction
of the arrow while releasing it from the two damper bracket
slots d and the front bracket slot e.
(5) Disconnect the flexible wi re from connector on the pickup
unit.
ATTENTION:
Turn the FD gear in the direction of the arrow to move the entire pickup unit to the appropriate posi tion where the flexible
wire of the CD mechanism unit can be disconnected easily.
(Refer to Fig.2)
CD mechanism assembly
h
Damper bracket
D
D
a
h
c
D
d
3.2.2 Removing the loading motor
(See Fig.3 to 5)
• Prior to performing the following procedure, remove the CD
mechanism control board.
(1) Remove the two springs f attaching the CD mechanism as-
sembly and the front bracket.
(2) Remove the two screws B and the front bracket while pull-
ing the flame outward.
(3) Remove the belt and the screw C from the loading motor.
CD mechanism control board
f
B
Loading motor
Pull outward
Front bracket
Fig.3
Front bracket
Pull outward
Front bracket
FD gear
Fig.1
Pickup unit
Fig.2
A
e
b
Flexible wire
CD mechanism
control board
Shift the lock
Flame
Fig.4
Loading motor
C
Belt
Fig.5
(No.49784)1-9
3.2.3 Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
• Prior to performing the following procedure, remove the CD
mechanism control board and the front bracket (loading motor).
(1) Remove the three screws D and the damper bracket.
(2) Raise the both sides fix arms and move the fix plates in the
direction of the arrow to place the four shafts g as shown in
Fig.8 and 9.
(3) Remove the CD mechanism assembly and the two springs
h attaching the flame.
(4) Remove the two screws E and both sides rear damper
brackets from the dampers. Detach the CD mechanism assembly from the left side to the right side.
ATTENTION:
The CD mechanism assembly can be removed if only the rear
damper bracket on the left side is removed.
CD mechanism assembly
h
Front bracket
CD mechanism
assembly
D
Damper bracket
D
Fig.1
D
A
b
Damper bracket
a
CD mechanism
e
control board
h
c
D
d
Flame
g
Fix plate (L)
Fix arm (R)
h
D
Fig.6
Fig.7
Rear damper bracket
Fig.8
Rear damper bracket
E
D
D
E
g
Fix plate(R)
Fix arm (L)
Damper
1-10 (No.49784)
g
g
Damper
Fig.9
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