How it Works
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KW-XC858
Service Manual
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JVC KW-XC858 Service Manual

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SERVICE MANUAL
CD/CASSETTE RECEIVER
TEL 13942296513 QQ 376315150 892498299
MA08920045
KW-XC858
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UN --------------------------Asean
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Area suffix
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TABLE OF CONTENTS
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-30
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COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED
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No.MA089
2004/5
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1.1 Safety Precautions

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SECTION 1
PRECAUTIONS
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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.
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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.
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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.
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(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.
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(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
• 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

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
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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.
(caption) Anti-static wrist strap
1M
pickup are shorted. After replacement, return the shorted parts to their original condition. (Refer to the text.)
destroy the laser diode.
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Conductive material (conductive sheet) or iron plate
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Short-circuit point
(Soldering)
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Flexible wire
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(No.MA089)1-3

1.5 Important for laser products

!
1.CLASS 1 LASER PRODUCT
2.DANGER : Invisible laser radiation when open and inter
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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.
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5.CAUTION : If safety switches malfunction, the laser is able
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to function.
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6.CAUTION : Use of controls, adjustments or performance of
procedures other than those specified here in may result in
hazardous radiation exposure.
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Please use enough caution not to see the beam directly or touch it in case of an adjustment or operation check.
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REPRODUCTION AND POSITION OF LABELS
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CLASS 1 LASER PRODUCT
WARNING LABEL
CAUTION : Visible and Invisible
laser radiation when open and interlock failed or defeated. AVOID DIRECT EXPOSURE TO BEAM. (e)
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ADVARSEL : Synlig og usynlig laserstråling når maskinen er åben eller interlocken fejeler. Undgå direkte eksponering til stråling. (d)
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VARNING : Synlig och osynling laserstrålning när den öppnas och spärren är urkopplad. Betrakta ej strålen. (s)
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VARO : Avattaessa ja suojalukitus ohitettuna tai viallisena olet alttiina näkyvälle ja näkymättömälle lasersäteilylle. Vältä säteen kohdistumista suoraan itseesi. (f)
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SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
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This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
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SECTION 3
DISASSEMBLY
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3.1 Main body section

3.1.1 Removing the front panel assembly (See Figs.1 and 2)
(1) From the both side of the main body, remove the four
screws A attaching the front panel assembly. (See Figs.1 and 2.)
(2) Release the four joints a and remove the front panel as-
sembly in the direction of the arrow. (See Figs.1 and 2.)
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A
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Front panel assembly
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3.1.2 Removing the rear bracket (See Figs.3)
• Prior to performing the following procedures, remove the front
panel assembly as required.
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(1) From the back side of the main body, remove the ten
screws B, screw C and screw D attaching the rear bracket.
(2) Remove the rear bracket from the main body.
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Front panel assembly
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B
B
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Fig.1
a
Fig.2
Rear bracket
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BC
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3.1.3 Removing the heat sink (See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly as required. From the left side of the main body, remove the two screws E and three screws F attaching the heat sink.
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Fig.4
Heat sink
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3.1.4 Removing the top chassis assembly and bottom chassis assembly
(See Figs.5 to 7)
• Prior to performing the following procedures, remove the front
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panel assembly, rear bracket and heat sink.
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(1) From the back side of the main body, disconnect the card
wire from the connector CN702 Fig.5.)
(2) From the both side of the main body, remove the three
screws G attaching the bottom chassis assembly. (See Figs.6 and 7.)
(3) Release the four joints b and remove the top chassis as-
sembly upward from the bottom chassis assembly. (See Figs.6 and 7.)
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on the main board. (See
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Card wire Main board
Top chassis assembly
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Fig.5
CN702
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Bottom chassis assembly
Top chassis assembly
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Fig.6
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Bottom chassis assembly
Fig.7
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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
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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 CN601
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.
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on the main board, and
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Main board
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CN601
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3.1.6 Removing the CD mechanism assembly (See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, rear bracket, heat sink, top chassis assembly and main board. From the inside of the top chassis assembly, remove the three screws J attaching the CD mechanism assembly.
Reference:
When attaching the CD mechanism assembly, align the pro­jections (d, e) of the top chassis assembly in the hole of the CD mechanism assembly.
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Fig.8
CD mechanism assembly
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Top chassis assembly
Fig.9
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3.1.7 Removing the changer control board
(See Figs.10 and 11)
• Prior to performing the following procedures, remove the front
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panel assembly, rear bracket, heat sink, top chassis assembly
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and bottom chassis assembly. (1) From the back side of the bottom chassis assembly, dis-
connect 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, align the projec­tions f of the bottom chassis assembly in the hole of the chang­er control board.
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on the
Bottom chassis assembly
Changer control board
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Bottom chassis assembly
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Fig.10
Cassette mechanism assembly
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CN972
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Card wire
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3.1.8 Removing the mecha control board
• 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, re-
(2) Disconnect the wire from the connector CJ402 and the
Reference:
When attaching the mecha control board, align the joints g of the bottom chassis assembly in the hole of the mecha control board.
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(See Fig.12)
move the screw L attaching the mecha control board and release the joints g from the bottom chassis assembly.
card wire from the connector CN403 board.
on the mecha control
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Changer control board
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Top chassis assembly Mecha control board
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CN403CJ402
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Fig.11
Fig.12
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3.1.9 Removing the cassette mechanism assembly (See Fig.13)
• Prior to performing the following procedure, remove the front
panel assembly, rear bracket, heat sink, bottom chassis as-
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sembly, changer control board and mecha control board. From the bottom side of the bottom chassis assembly, remove the four screws M attaching the cassette mechanism assembly to the bottom chassis assembly.
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Cassette mechanism assembly
3.1.10 Removing the LCD board (See Fig.14)
• Prior to performing the following procedures, remove the front
panel assembly. (1) From the inside of front panel assembly, remove the twelve
screws N attaching the LCD board and take out the LCD board.
(2) From the reverse side of LCD board, remove the solders
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from the soldered sections h attaching the wires.
3.1.11 Removing the switch board (See Fig.15)
• Prior to performing the following procedures, remove the front
panel assembly. (1) From the inside of front panel assembly, remove the five
screws P attaching the switch board.
(2) Release the claws i attaching the switch board in the direc-
tion of the arrow and take out the switch board.
(3) From the reverse side of switch board, remove the solders
from the soldered sections j attaching the wires.
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Front panel assembly
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Front panel assembly
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LCD board
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Bottom chassis assembly
Fig.13
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Fig.14
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Switch board
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3.2 CD mechanism section

3.2.1 Removing the CD mechanism control board
(See Fig.1 and 2)
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(1) Unsolder the part a and b on the CD mechanism control
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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 wire 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 position where the flexible wire of the CD mechanism unit can be disconnected easi­ly.(Refer to Fig.2)
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CD mechanism assembly
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h
Front bracket
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Damper bracket
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Fig.1
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d
CD mechanism control board
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FD gear
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Pickup unit
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Fig.2
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Flexible wire
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Shift the lock
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3.2.2 Removing the loading motor (See Fig.3 to 5)
• Rrior to performing the following procedure, remove the CD
mechanism control board.
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(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.
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CD mechanism control board
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Loading motor
Pull outward Pull outward
Flame
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Loading motor
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Front bracket
Fig.3
Front bracket
Fig.4
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Fig.5
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3.2.3 Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
• Prior to performing the following procedure, remove the CD
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mechanism control board and the front bracket (loading mo-
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tor). (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.
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CD mechanism
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Flame
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assembly
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Fig.6
Fig.7
Damper bracket
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Fix arm (R)
Fix plate (L)
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Rear damper bracket
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Rear damper bracket
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Damper
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Fig.8
Fig.9
E
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Fix plate(R)
g
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Damper
Fix arm (L)
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3.2.4 Removing the feed motor assembly (See Fig.10)
• Prior to performing the following procedure, remove the CD
mechanism control board, the front bracket (loading motor)
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and the CD mechanism assembly. (1) Remove the two screws F and the feed motor assembly.
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Feed motor assembly
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F
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FD screw
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Part i
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Pickup unit
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Part j
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3.2.5 Removing the pickup unit (See Fig.10 and 11)
• Prior to performing the following procedure, remove the CD
mechanism control board, the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly. (1) Detach the FD gear part of the pickup unit upward. Then re-
move the pickup unit while pulling out the part i of the FD screw.
ATTENTION:
When reattaching the pickup unit, reattach the part j of the pickup unit, then the part i of the FD screw.
(2) Remove the screw G attaching the nut push spring plate
and the pickup mount nut from the pickup unit. Pull out the FD screw.
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3.2.6 Removing the spindle motor (See Fig.12 and 13)
• Prior to performing the following procedure, remove the CD
mechanism control board, the front bracket (loading motor), the CD mechanism assembly and the feed motor assembly. (1) Turn up the CD mechanism assembly and remove the two
springs k on both sides of the clamper arms. Open the clamper arm upward.
(2) Turn the turn table, and remove the two screws H and the
spindle motor.
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Nut push spring plate
FD screw
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k
FD gear
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Pickup unit
Fig.10
G
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Fig.11
Pickup mount nut
Pickup unit
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k
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Spindle motor
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Fig.12
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3.3 Cassette mechanism assembly

REFERENCE:
Prior to performing the following procedures, turn the mode
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gear on the bottom of the body until the respective part comes
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to the EJECT position (Refer to Fig.1).
3.3.1 Removing the cassette guide
(See Fig.2)
(1) Turn the mode gear to set to RVS play or subsequent
mode.
(2) Remove the cassette guide from the main chassis while re-
leasing each two joint tabs a in the direction of the arrow.
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Cassette guide
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Fig.1
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Mode gea
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3.3.2 Removing the load arm
(1) Remove the E-washer attaching the load arm. (2) Move the load arm in the direction of the arrow and release
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(See Fig.3)
the joint b on the cassette catch.
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Load arm
E-washer
Tab a
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Fig.2
Joint b
Fig.3
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Tab a
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3.3.3 Removing the cassette hanger assembly / cassette holder (See Fig.4 to 7)
(1) Check the mode is set to EJECT. Push down the front part
of the cassette holder and move in the direction of the ar-
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row to release the joint c.
(2) Move the rear part of the cassette hanger assembly in the
direction of the arrow to release it from the two joint bosses d.
(3) Release the holder stabilizer spring from the hooks e and
f, then pull out from the cassette hanger assembly.
(4) Bring up the rear side of the cassette hanger assembly to
release the joint g and h.
(5) Pull out the cassette catch from the cassette hanger as-
sembly.
3
7
6
3
1
5
1
5
0
Cassette holder assembly
Side bracket
Joints c
8
9
2
4
Boss d
8
9
Cassette hanger assembly
Boss d
2
9
9
TEL 13942296513 QQ 376315150 892498299
TEL
13942296513
Q
Cassette holder assembly
Cassette stabilizer spring
7
3
Q
Cassette holder assembly
Hook e
3
6
1
5
1
Fig.4
Fig.5
5
0
Cassette hange
assembly
Hook f
4
2
9
8
9
8
2
9
TEL 13942296513 QQ 376315150 892498299
9
w
w
1-16 (No.MA089)
w
.
xia
Cassette hanger
Hook g
Cassette catch
o
y
u
1
6
3
.
c
Hook h
Fig.6
Cassette hanger assembly
Cassette holder assembly
o
Fig.7
assembly
m
3.3.4 Removing the side bracket assembly
(See Fig.8 to 10)
(1) Remove the screw A attaching the side bracket assembly.
Q
TEL 13942296513 QQ 376315150 892498299
(2) Detach the front side of the side bracket assembly upward
Q
and pull out forward to release the joint i and j in the rear.
CAUTION:
CAUTION:
7
3
When reassembling, make sure that the boss k of the main chassis is set in the notch of the load rack under the side bracket assembly. Do not reattach the load rack on the boss k.
After reattaching the side bracket assembly, confirm op­eration.
6
3
1
5
1
5
0
Side bracket assembly
2
9
8
A
Side bracket assembly
Joint i
4
9
Fig.8
Side bracket assembly
8
Joint i
2
9
Joint j
Joint j
9
TEL 13942296513 QQ 376315150 892498299
TEL
13942296513
Q
Q
Load rack
6
7
3
Load rack
3
1
1
5
Boss k
Boss k
5
0
8
Fig.9
9
2
4
9
8
2
9
9
w
w
w
.
xia
o
y
u
1
6
3
.
c
o
Fig.10
m
(No.MA089)1-17
r
3.3.5 Removing the pinch arm (F) assembly (See Fig.11 and 12)
(1) Remove the polywasher and pull out the pinch arm (F) as-
sembly.
Q
Q
(2) Remove the compulsion spring.
3.3.6 Removing the pinch arm (R) assembly (See Fig.11 and 12)
(1) Remove the polywasher and pull out the pinch arm (R) as-
sembly.
3.3.7 Removing the slide chassis assembly (See Fig.13 and 14)
REFERENCE:
It is not necessary to remove the head and the tape guide.
(1) Move the slide chassis assembly in the direction of the ar-
TEL 13942296513 QQ 376315150 892498299
row to release the two joints l and remove from the main chassis.
(2) Remove the rack link.
CAUTION:
When reassembling, first reattach the rack link, and next fit the boss m and hook n of the slide chassis assembly to the hole of the main chassis, and engage the two joints l.
3
7
6
3
1
5
1
5
0
Joint l
Slide chassis assembly
8
Boss m
9
2
Fig.13
4
9
Head
2
8
Tape guide
Joint l
9
9
TEL 13942296513 QQ 376315150 892498299
Polywasher
TEL
Polywasher
Compulsion spring
13942296513
Pinch arm (R) assembly
Pinch arm (F) assembly
Fig.11
Pinch arm (F) assembly
Pinch arm (R) assembly
Polywashe
Polywasher
Q
Rack link
Q
3
7
6
3
1
5
1
0
5
Fig.14
Hook n
9
8
2
4
9
8
2
9
9
w
w
1-18 (No.MA089)
w
Fig.12
.
xia
o
y
u
1
6
3
.
c
o
m
3.3.8 Removing the head / tape guide
(See Fig.16 and 17)
REFERENCE:
Q
TEL 13942296513 QQ 376315150 892498299
It is not necessary to remove the slide chassis assembly.
Q
(1) Remove the band attaching the wire to the head. (2) Remove the two screws B, the head and the head support
spring. (3) Remove the pinch arm spring from the tape guide. (4) Remove the tape guide and the pinch spring arm.
CAUTION:
CAUTION:
3.3.9 Removing the flywheel assembly (F) & (R) (See Fig.18 and 19)
REFERENCE:
It is not necessary to remove the slide chassis assembly. (1) Remove the belt at the bottom. (2) Remove the two polywashers on the upper side. (3) Pull out each flywheel assembly downward.
Slide chassis assembly
7
3
When reattaching the pinch arm spring, set both end of it to the pinch spring arm (remarked o).
When reattaching the head, set the wires into the groove of the tape guide (Fig.16).
6
3
1
5
1
5
B
0
Flywheel assembly (F)
4
2
9
8
Flywheel assembly (R)
9
Fig.17
Polywasher
Belt
8
Polywasher
2
9
9
TEL 13942296513 QQ 376315150 892498299
TEL
13942296513
Head support spring
Tape guide
Pinch spring arm
Head
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
Head
Fig.15
o
Tape guide
B
Pinch arm spring
Flywheel assembly (F)
Flywheel assembly (R)
Fig.18
o
w
w
w
.
Slid chassis assembly
xia
Fig.16
o
y
u
1
6
3
.
c
o
m
(No.MA089)1-19
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