JVC KD-S283 Bedienungsanleitung
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED No.49871
2003/10
CD RECEIVER
4987120039KD-S283
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
Area suffix
UF ---------------------- China
COMPACT
DIGITAL AUDIO
1-2 (No.49871)
SPECIFICATION
Design and specifications are subject to change without notice.
AUDIO AMPLIFIERSECTION
Maximum Power
Output Front 45W per channel
Rear 45W per channel
Continuous Power
Output (RMS) Front 17W per channel into 4 Ω, 40 Hz to 20000 Hz at no more than 0.8%
total harmonic distortion.
Rear 17W per channel into 4 Ω, 40 Hz to 20000 Hz at no more than 0.8%
total harmonic distortion.
Load Impedance 4 Ω(4 Ωto 8 Ωallowance)
Tone Control Range Bass ±10 dB at 100 Hz
Treble ±10 dB at 10 kHz
Frequency Response 40 Hz to 20000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.0 V/20 kΩload (full scale)
Output Impedance 1 kΩ
TUNER SECTION
Frequency Range FM 87.5 MHz to 108.0 MHz
AM 531 kHz to 1602 kHz
[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 uV/75 Ω)
50 dB Quieting Sensitivity 16.3 dBf (1.8 uV/75 Ω)
Alternate Channel Selectivity (400 kHz) 65 dB
Frequency Response 40 Hz to 15000 Hz
Stereo Separation 35 dB
Capture Ratio 1.5 dB
[AM Tuner] Sensitivity 20 uV
Selectivity 35 dB
CD PLAYER SECTION
Type Compact disc player
Signal Detection System Non-contact optical pickup (semiconductor laser)
Number of channels 2 channels (stereo)
Frequency Response 5 Hz to 20000 Hz
Dynamic Range 90 dB
Signal-to-Noise Ratio 95 dB
Wow and flutter Less than measurable limit
GENERAL
Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Grounding System Negative ground
Allowable Operating Temperature 0ºC to +40ºC
Dimensions
(W ×H ×D) Installation Size (approx.) 182 mm ×52 mm ×150 mm
Panel size (approx.) 188 mm ×58 mm ×11 mm
Mass (approx.) 1.3 kg
(No.49871)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.49871)
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.49871)1-5
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.
1-6 (No.49871)
SECTION 3
DISASSEMBLY
3.1 Main body
3.1.1 Removing the front panel assembly
(See Fig.1)
(1) Press the release button and remove the front panel as-
sembly.
Fig.1
3.1.2 Removing the bottom cover
(See Figs.2)
(1) Turn over the main body and release the two joints a, two
joints band joint c.
CAUTION:
Do not damage the main board when releasing the joints using
a screwdriver.
Fig.2
3.1.3 Removing the front chassis assembly
(See Figs.3)
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the screws Aon the left side of the main body.
(2) Release the two joints dand joints eon the both sides of
the main body, then remove the front chassis assembly to-
ward the front.
Fig.3
Front panel assembly
Release button
Joint a
Bottom cover
Joint a
Joint c
Joint b
Joint b
A
Joint dJoint e
Joint d
Front chassis assembly
Joint e
(No.49871)1-7
3.1.4 Removing the heat sink
(See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly as required.
(1) Remove the two screws Band screw Con the left side of
the main body.
Fig.4
3.1.5 Removing the rear bracket
(See Fig.5)
• Prior to performing the following procedures, remove the bot-
tom cover.
(1) Remove the three screws D, three screws Eand two
screws Fon the back side of the main body.
(2) Remove the rear bracket.
Fig.5
3.1.6 Removing the main board
(See Fig.6)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis assembly, heat
sink and rear bracket.
(1) Remove the two screws Gattaching the main board.
(2) Disconnect the connector CN501 and remove the main
board.
Fig.6
B
C
Heat sink
E
Rear bracket
F
DED
F
G
Main board
G
CN501
1-8 (No.49871)
3.1.7 Removing the CD mechanism assembly
(See Fig.7)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis assembly, heat
sink, rear bracket and main board.
(1) Remove the three screws Hattaching the CD mechanism
assembly to the top chassis.
Fig.7
3.1.8 Removing the front board
(See Figs. 8 to 10)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) Remove the four screws Jon the back side of the front pan-
el assembly. (See Fig.8)
(2) Release the eleven joints fattaching the rear cover to the
front panel assembly. (See Fig.9)
(3) Take out the front board from the front panel assembly.
(See Fig.10)
Fig.8
Fig.9
Fig.10
H
CD mechanism assembly Top chassis
H
JJ
J
Front panel assembly
Front panel assembly
Rear cover
fJoints
Joints f
Joints ffJoints
Front board Front panel assembly
(No.49871)1-9
3.2 CD Mechanism Assembly
3.2.1 Removing the top cover
(See Figs.1 and 2)
(1) Remove the two screws Aon the both side of the body.
(2) Lift the front side of the top cover and move the top cover
backward to release the two joints a.
Fig.1
Fig.2
A
A
A
Joints a
Top cover
Joints a
Top cover
1-10 (No.49871)
3.2.2 Removing the connector board
(See Figs.3 to 5)
CAUTION:
Before disconnecting the flexible wire from the pickup, solder
the short-circuit point on the pickup. No observance of this in-
struction may cause damage of the pickup.
(1) Remove the screw Bfixing the connector board.
(2) Solder the short-circuit point on the connector board.
(3) Disconnect the flexible wire from the pickup.
(4) Move the connector board in the direction of the arrow to
release the two joints b.
(5) Unsolder the wire on the connector board if necessary.
CAUTION:
Unsolder the short-circuit point after reassembling.
Fig.3
Fig.4
Fig.5
B
Connector board
Pickup
Short-circuit point
Joints b
Wires
Pickup
Short-circuit point
(Soldering)
Flexible wire
B
Flexible wire
Connector board
Frame
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Andere JVC CD-Receiver Handbücher
