JVC KD-S284 Service Manual
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SERVICE MANUAL
CD RECEIVER
TEL 13942296513 QQ 376315150 892498299
4987220039
KD-S284
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COMPACT
DIGITAL AUDIO
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24
5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
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UF ------------- China
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Area Suffix
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COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LIMITED
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No.49872
2003/9
SPECIFICATION
AUDIO AMPLIFIER
SECTION
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TEL 13942296513 QQ 376315150 892498299
TUNER SECTION Frequency Range FM 87.5 MHz to 108.0 MHz
TEL
CD PLAYER
SECTION
GENERAL Power Requirement Operating Voltage DC 14.4 V (11 V to 16 V allowance)
Maximum Power
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Output
Continuous Power
Output (RMS)
Load Impedance 4 Ω (4 Ω to 8 Ω allowance)
Tone Control Range Bass ±10 dB at 100 Hz
Frequency Response 40 Hz to 20000 Hz
Signal-to-Noise Ratio 70 dB
Line-Out Level/Impedance 2.0 V/20 kΩ load (full scale)
Output Impedance 1 kΩ
[FM Tuner] Usable Sensitivity 11.3 dBf (1.0 uV/75 Ω )
[AM Tuner] Sensitivity 20 uV
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 96 dB
Signal-to-Noise Ratio 98 dB
Wow and flutter Less than measurable limit
Grounding System Negative ground
Allowable Operating Temperature 0ºC to +40ºC
Dimensions
(W × H × D)
Mass (approx.) 1.4 kg
3
Front 45W per channel
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Rear 45W per channel
Front 17W per channel into 4 Ω , 40 Hz to 20000 Hz at
Rear 17W per channel into 4 Ω , 40 Hz to 20000 Hz at
Treble ±10 dB at 10 kHz
AM 531 kHz to 1602 kHz
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
Selectivity 35 dB
Installation Size (approx.) 182 mm × 52 mm × 150 mm
Panel size (approx.) 188 mm × 58 mm × 12 mm
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no more than 0.8% total harmonic distortion.
no more than 0.8% total harmonic distortion.
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Design and specifications are subject to change without notice.
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1.1 Safety Precautions
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SECTION 1
PRECAUTION
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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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(No.49872)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.
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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 dio de) 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 sh eet) 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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TEL 13942296513 QQ 376315150 892498299
(3) Handling the optical pickup
• In order to maintain quality during transpo rt and before install ation, 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
replacement procedure in the text. Remove the anti-static pin when replacing the traverse unit. Be careful not to take too long a
TEL
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 CDpickup 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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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
3.1.1 Removing the front panel assembly
(See Fig.1)
(1) Press the detach button and remove the front panel as-
sembly.
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Front panel assembly
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Detach button
3.1.2 Removing the bottom cover
(See Fig.2)
(1) From the bottom side of the main body, re lease the two
joints a, two joints b and joint c.
CAUTION:
Do not damage the main board when releasing the joints using
a screwdriver.
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3.1.3 Removing the front chassis assembly
(See Figs.3 and 4)
• Prior to performing the following procedures, remove the front
panel assembly and bottom cover.
(1) From the both sides of the main body, remove the two
screws A attaching the front chassis assembly. (See
Fig.3.)
(2) From the front side of the main body, remove the two
screws B attaching the front chassis assembly. (See
Fig.4.)
(3) Release the two joi nts d and two joints e from the both
sides of the main body, then remove the front chassis assembly toward the front. (See Fig.3.)
13942296513
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Joint a
Joint a
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Joint d
Joint d
Fig.1
Bottom cover
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Fig.2
A
Front chassis assembly
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A
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Joint e
Joint e
Joint b
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Joint b
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Fig.4
3.1.4 Removing the heat sink
(See Fig.5)
• Prior to performing the following procedure, remove the front
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panel assembly as required.
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(1) From the left side of the main body, remove the two screws
C and screw D attaching the heat sink.
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3.1.5 Removing the rear bracket
(See Fig.6)
• Prior to performing the following procedure, remove the bottom
cover.
(1) From back side of the main body, remove the three screws
E, three screws F and two screws G attaching the rear
bracket.
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3.1.6 Removing the main board
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis assembly, heat
sink and rear bracket.
(1) From the bottom side of the main body, remove the two
(2) Disconnect the connector CN501
13942296513
(See Fig.7)
screws H attaching the main board.
from the CD mechanism
assembly and remove the main board.
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CN501
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Fig.5
Fig.6
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Rear bracket
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Main board
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(No.49872)1-7
3.1.7 Removing the CD mechanism assembly
(See Fig.8)
• Prior to performing the following procedure, remove the fro nt
panel assembly, bottom cover, front chassis assembly, heat
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sink, rear bracket and main board.
(1) Remove the three screws J attaching the CD mechanism
assembly to the top chassis.
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CD mechanism assembly
3.1.8 Removing the front board
(See Figs. 9 to 11)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) From the back side of the front panel assembly, remove the
four screws K attaching the rear cover to the front panel assembly. (See Fig.9.)
(2) Release the ten joints f attaching the rear cover to the front
panel assembly. (See Fig.10.)
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(3) Take out the front board from the front panel assembly.
(See Fig.11.)
Caution:
Take care not to lose the springs.
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Rear cover
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Top chassis
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Joints f
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Front panel assembly
Joints f
Front board
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Spring
3.2 CD Mechanism Ass embly
A
3.2.1 Removing the top cover
(See Figs.1 and 2)
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(1) Remove the two screws A on the both side of the body.
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(2) Lift the front side of the top cover and move the top cover
backward to release the two joints a.
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Joints a
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Fig.1
Fig.2
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3.2.2 Removing the connector board
(See Figs.3 to 5)
CAUTION:
Before disconnecting the flexible wire from the pickup, solder
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the short-circuit point on the pickup. No observance of this instruction may cause damage of the pickup.
(1) Remove the screw B fixing 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.
TEL 13942296513 QQ 376315150 892498299
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Connector board
Flexible wire
Wires
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B
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Joints b
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Short-circuit point
Fig.3
Short-circuit point
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(Soldering)
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Pickup
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Flexible wire
Frame
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Connector board
Pickup
Fig.4
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3.2.3 Removing the DET switch
(See Figs.6 and 7)
(1) Extend the two tabs c of the feed sw. holder and pull out
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the switch.
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(2) Unsolder the DET switch wire if necessary.
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Connector
board
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DET switch
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DET switch
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Tab c
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Fig.6
Feed sw. holder
Fig.7
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Pickup
Tab c
DET switch wire
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3.2.4 Removing the chassis unit
(See Figs.8 and 9)
• Prior to performing the following procedure, remove the top
cover and connector board.
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(1) Remove the two suspension springs (L) and (R) attaching
the chassis unit to the frame.
CAUTION:
• The shape of the suspension spring (L) and (R) are different. Handle them with care.
• When reassembling, make sure that the three shafts
on the underside of the chassis unit are inserted to the
dampers certainly.
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Suspension spring (R)
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Chassis unit
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Suspension spring (L)
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Frame
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TEL 13942296513 QQ 376315150 892498299
Suspension spring (R)
Shafts
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Damper
Chassis unit
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Fig.8
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Suspension spring (L)
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Shaft
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Dampe
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3.2.5 Removing the clamper assembly
(See Figs.10 and 11)
• Prior to performing the followin g procedure, remove the top
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TEL 13942296513 QQ 376315150 892498299
cover.
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(1) Remove the clamper arm spring.
(2) Move the clamper assembly in the direction of the arrow to
release the two joints d.
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Clamper arm
spring
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Joint d
Joint d
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Clamper assembly
Clamper arm spring
4
Fig.10
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Chassis rivet
assembly
Joint d
Clamper
assembly
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Chassis rivet assembly
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Fig.11
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3.2.6 Removing the loading / feed motor assembly
(See Figs.12 and 13)
• Prior to performing the following procedure, remove the top
cover, connector board and chassis unit.
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(1) Remove the screw C and move the loading / feed motor
assembly in the direction of the arrow to remove it from the
chassis rivet assembly.
(2) Disconnect the wire from the loading / feed motor assembly
if necessary.
CAUTION:
When reassembling, connect the wire from the loading /
feed motor assembly to the flame as shown in Fig.12.
TEL 13942296513 QQ 376315150 892498299
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Loading / feed motor assembly
Fig.12
Loading / feed motor assembly
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Fig.13
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3.2.7 Removing the pickup unit
(See Figs.14 to 18)
• Prior to performing the followin g procedure, remove the top
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TEL 13942296513 QQ 376315150 892498299
cover, connector board and chassis unit.
Q
(1) Remove the screw D and pull out the pu. shaft holder from
the pu. shaft.
(2) Remove the screw E attaching the feed sw. holder.
(3) Move the part e of the pickup unit upward with the pu. shaft
and the feed sw. holder, then release the joint f of the feed
sw. holder in the direction of the arrow. The joint g of the
pickup unit and the feed rack is released, and the feed sw.
holder comes off.
(4) Remove the pu. shaft from the pickup unit.
(5) Remove the screw F attaching the feed rack to the pickup
unit.
3.2.8 Reattaching the pickup unit
(See Figs.14 to 17)
(1) Reattach the feed rack to the pickup unit using the screw F.
(2) Reattach the feed sw. holder to the feed rack while setting
the joint g to the slot of the feed rack and setting the part f
of the feed rack to the switch of the feed sw. holder correctly.
(3) As the feed sw. holder is temporarily attached to the pickup
unit, set to the gear of the joint g and to the bending part of
the chassis (joint h) at a time.
CAUTION:
(4) Reattach the feed sw. holder using the screw E.
(5) Reattach the pu. shaft to the p ickup unit. Re attach the pu.
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shaft holder to the pu. shaft using the screw D.
Joint f
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Make sure that the part i on the underside of the feed
rack is certainly inserted to the slot j of the change lock
lever.
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Feed sw. holder
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Joint g
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Part e
Feed sw.
holder
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Pickup unit
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Feed rack
Part i
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F
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Pickup unit
Slot j
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Fig.15
Joint f
Fig.16
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Feed sw. holder
Pu. shaft
Joint h
Feed rack
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Pickup unit
2
Pu. shaft
holder
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Pu. shaft holder
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Pickup unit
Fig.14
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Joint g
Part e
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Feed rack
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Fig.17
Joint g
Feed sw. holder
Fig.18
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Pickup unit
Joint f
(No.49872)1-15
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