JVC KW-XC88 Service Manual
SERVICE MANUAL
CD/CASSETTE RECEIVER
MA09920048
KW-XC88
Area suffix
UN --------------------------Asean
CD
KW-XC88
DISP
AUX
EQ
SEL
LV
MODE EX
1728394105116
CD/CASSETTE RECEIVER
45Wx4
TAPE
12
CD / CH
FM / AM
TAPE / AUX
+10
10
PROG
TABLE OF CONTENTS
1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-32
COPYRIGHT © 2004 Victor Company of Japan, Limited
No.MA099
2004/8
SPECIFICATION
AUDIO AMPLIFIER SECTION
Maximum Power Output Front 45 W per channel
Rear 45 W per channel
Continuous Power Output
(RMS)
Load Impedance 4
Equalizer Control Range LOW ±12 dB (50 Hz, 80 Hz, 120 Hz)
Frequency Response 40 Hz to 20 000 Hz
Signal-to-Noise Ratio 70 dB
Line-In level/Impedance Auxiliary input jack (3.5 mm dia. stereo mini jack)
Line-Out Level/Impedance 2.0 V/20 k
Output Impedance 1 k
Frequency Range FM 87.5 MHz to 108.0 MHz
FM Tuner Usable Sensitivity 11.3 dBf (1.0
AM Tuner Sensitivity 20
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of channels 2 channels (stereo)
Frequency Response 5 Hz to 20 000 Hz
Dynamic Range 96 dB
Signal-to-Noise Ratio 98 dB
Wow and Flutter Less than measurable limit
Wow and Flutter 0.1 % (WRMS)
Fast-Wind Time 100 sec. (C-60)
Frequency Response 30 Hz to 16 000 Hz (Normal tape)
Signal-to-Noise Ratio
(Normal tape)
Stereo Separation 40 dB
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Working Temperature 0ºC to +40ºC
Dimensions (W
Mass 2.2 kg (excluding accessories)
× H × D) Installation Size 178 mm × 100 mm × 150 mm
Front 17 W per channel into 4
monic distortion.
Rear 17 W per channel into 4
monic distortion.
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total har-
Ω, 40 Hz to 20 000 Hz at no more than 0.8% total har-
Ω (4 to 8 Ω allowance)
MID ±12 dB (700 Hz, 1 kHz, 2 kHz)
HIGH ±12 dB (8 kHz, 12 kHz)
Ω load (full scale)
Ω
TUNER SECTION
AM 531 kHz to 1 602 kHz
µV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15 000 Hz
Stereo Separation 35 dB
Capture Ratio 1.5 dB
µV/75 Ω)
µV
Selectivity 35 dB
CD PLAYER SECTION
CASSETTE DECK SECTION
Dolby B NR ON 65 dB
Dolby B NR OFF 56 dB
GENERAL
Front Panel Size 170 mm
× 96 mm × 20 mm
Design and specifications subject to change without notice.
1-2 (No.MA099)
1.1 Safety Precautions
SECTION 1
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.MA099)1-3
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.
(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 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.
Short-circuit point
(Soldering)
1-4 (No.MA099)
Short-circuit point
Flexible wire
Pickup
Pickup
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.
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CAUTION : Visible and Invisible
CLASS 1
LASER PRODUCT
laser radiation when open and
interlock failed or defeated.
AVOID DIRECT EXPOSURE TO
BEAM. (e)
ADVARSEL : Synlig og usynlig
laserstråling når maskinen er
åben eller interlocken fejeler.
Undgå direkte eksponering til
stråling. (d)
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)
(No.MA099)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.MA099)
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)
A
A
Front panel assembly
Joints a
Fig.1
Front panel assembly
A
Joints a
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.
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
B
B
A
Fig.2
BC
D
Rear braket
Fig.3
Heat sink
FFE
F
Fig.4
(No.MA099)1-7
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 card
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 re-
move 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 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.
on the main board, and
Bottom chassis assemblyGJoints b
Fig.6
Top chassis assembly
Joints b
Top chassis assembly
Bottom chassis assembly
Fig.7
Main board
H
G
CN601
1-8 (No.MA099)
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 attaching 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.
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, 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, joint the hole of the
changer control board in joints f of the bottom chassis assembly.
on the
CD mechanism assembly
J
Changer control board
Bottom chassis assembly
Cassette mechanism assembly
Bottom chassis assembly
Boss eBoss d
J
Top chassis assembly
Fig.9
Fig.10
J
CN972
Card wire
K
Changer control board
K
Joints f
Fig.11
(No.MA099)1-9
3.1.8 Removing the mecha 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, re-
move 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 hole of the
mecha control board in joints i of the bottom chassis assembly.
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, re-
move the four screws M attaching the cassette mechanism
assembly to the bottom chassis assembly.
on the mecha control
and the
CN403CJ402
Joints g
L
Top chassis assembly Mecha control board
Fig.12
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 turn
over the LCD board.
(2) From the reverse side of LCD board, remove the solders
from the soldered points h attaching the wire.
M
Cassette mechanism assembly
Fig.13
Front panel assembly
N
LCD board
Solder points h
Fig.14
Bottom chassis assembly
NN
N
1-10 (No.MA099)
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 switch 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.
Front panel assembly
Solder points j
P
Claws i
Fig.15
P
Switch board
(No.MA099)1-11
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