JVC KW-XC888 User manual
SERVICE MANUAL
COPYRIGHT © 2004 Victor Company of Japan, Limited No.MA081
2004/7
CD/CASSETTE RECEIVER
MA08120047
KW-XC888
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-38
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-42
Area suffix
UN --------------------------Asean
1-2 (No.MA081)
SPECIFICATION
Design and specifications are subject to change without notice.
AUDIO AMPLIFIER SECTION
Maximum Power Output (DC 16V) Front 50 W per channel
Rear 50 W per channel
Continuous Power Output (10% THD) Front 25 W per channel into 4 Ω.
Rear 25 W per channel into 4 Ω.
Load Impedance 4 Ω(4 to 8 Ωallowance)
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1 602 kHz
[FM Tuner] Usable Sensitivity 6 dBµV
Stereo Separation 28 dB
[AM Tuner] Sensitivity 30 dBµV
CD PLAYER SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of channels 2 channels (stereo)
Frequency Response 30 Hz to 20 000 Hz
Signal-to-Noise Ratio 75 dB
Wow and Flutter Less than measurable limit
Channel Separation (1 kHz) 65 dB
CASSETTE DECK SECTION
Frequency Response 30 Hz to 16 000 Hz
Wow and Flutter 0.2 % (WRMS)
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Dimensions (W ×H ×D) Installation Size 178 mm ×100 mm ×175 mm
Front Panel Size 183 mm ×103 mm ×15 mm
Mass 2.2 kg (excluding accessories)
(No.MA081)1-3
SECTION 1
PRECAUTION
1.1 Safety Precautions
!Burrs formed during molding may be left over on some parts of the chassis. Therefore,
pay attention to such burrs in the case of preforming repair of this system.
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
1-4 (No.MA081)
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 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 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 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.
1M
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Pickup
Short-circuit point
(Soldering)
Flexible wire
Pickup
Short-circuit point
(No.MA081)1-5
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
1-6 (No.MA081)
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
(No.MA081)1-7
SECTION 3
DISASSEMBLY
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 two
screws Aattaching the front panel assembly. (See Figs.1
and 2.)
(2) Release the four joints aand remove the front panel as-
sembly in the direction of the arrow. (See Figs.1 and 2.)
Fig.1
Fig.2
Front panel assembly
a
A
Front panel assembly
a
A
1-8 (No.MA081)
3.1.2 Removing the heat sink
(See Figs.3 and 4)
(1) From the back side of the main body, remove the six
screws Battaching the heat sink. (See Fig.3.)
(2) Remove the heat sink from the main body.
Note:
• Before attaching the heat sink, attach the cooling rubbers on
the power amplifier IC. (See Fig.4)
• When attaching the heat sink, set the projections bon the
rear bracket in the holes of the heat sink. (See Fig.3.)
3.1.3 Removing the rear bracket
(See Fig.4)
• Prior to performing the following procedures, remove the heat
sink.
(1) From the back side of the main body, remove the eight
screws Cattaching the rear bracket.
(2) Remove the rear bracket from the main body.
Fig.3
Fig.4
B
B
B
bb
Rear bracket heat sink
C
C
C
C
Rear bracket
Cooling rubbers
Power amplifier IC
(No.MA081)1-9
3.1.4 Removing the bottom chassis assembly
(See Fig.5)
• Prior to performing the following procedures, remove the front
panel assembly, heat sink and rear bracket.
(1) From the bottom side of the main body, remove the four
screws Dattaching the bottom chassis assembly.
(2) Take out the bottom chassis assembly from the main body.
Reference:
When attaching the bottom chassis assembly, set the projec-
tions cof the main body in the holes of the bottom chassis as-
sembly.
Fig.5
3.1.5 Removing the mechanism control board
(See Fig.6)
• Prior to performing the following procedures, remove the front
panel assembly, heat sink, rear bracket and bottom chassis
assembly.
(1) From the inside of the bottom chassis assembly, discon-
nect the card wire from the connector CN403 on the mech-
anism control board.
(2) Disconnect the wire from the connector CN402 on the
mechanism control board.
(3) Remove the three screws Eattaching the mechanism con-
trol board.
(4) Take out the mechanism control board from the bottom
chassis assembly.
Reference:
• When attaching the mechanism control board, set the pro-
jections dof the bottom chassis assembly in the holes of the
mechanism control board.
• After attaching the mechanism control board, fix the wire
with the wire clamp as before.
Fig.6
Bottom chassis assembly
c
DD
E
E
d
d
d
CN403CN402
Wire clamp
Mechanism control board
Bottom chassis assembly
1-10 (No.MA081)
3.1.6 Removing the cassette mechanism assembly
(See Fig.7)
• Prior to performing the following procedures, remove the front
panel assembly, heat sink, rear bracket and bottom chassis
assembly.
(1) From the inside of the bottom chassis assembly, discon-
nect the card wire from the connector CN403 on the mech-
anism control board.
(2) Disconnect the wire from the connector CN402 on the
mechanism control board.
(3) Remove the four screws Fattaching the cassette mecha-
nism assembly.
Reference:
After attaching the mechanism control board, fix the wire with
the wire clamp as before.
Fig.7
3.1.7 Removing the middle chassis assembly
(See Fig.8)
• Prior to performing the following procedures, remove the front
panel assembly, heat sink, rear bracket and bottom chassis
assembly.
(1) From the bottom side of the main body, remove the four
screws Gattaching the middle chassis assembly.
(2) Disconnect the connector CN501 of the main board on the
middle chassis assembly from the CD mechanism assem-
bly in an upward direction.
Fig.8
CN403
CN402
Wire clamp
Mechanism control board
Bottom chassis assembly
F
F
FCassette mechanism assembly
Main board
Middle chassis assembly
GG
CN501
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