JVC KD-SX921R, KD-SX992R Service Manual
KD-SX992R/KD-S921R
SERVICE MANUAL
CD RECEIVER
KD-SX992R/KD-SX921R
KD-SX992R
SOUND
ATT
U
SOURCE
F
R
D
VOL
VOL
EQ
KD-SX992R
DAB
TP
PTY
KD-SX921R
Contents
Safety precaution
Preventing static electricity
Important of laser products
Disassembly method
Adjustment method
EQ
1-2
1-3
1-4
1-5
1-20
KS-SX921R
DAB
TP
PTY
Area Suffix
E ---- Continental Europe
EX ------- Central Europe
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-21
1-23
1-23
1-24
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
No.49719
Mar. 2002
KD-SX992R/KD-SX921R
Safety precaution
!
!
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.
1-2
KD-SX992R/KD-SX921R
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.
1.1. Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
1.1.1. Ground the workbench
1. 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.
1.1.2. Ground yourself
1. Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
1.1.3. Handling the optical pickup
1. 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.)
2. 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.
1.2. 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
Short-circuit point
(Soldering)
Connector board
Joints b
Short-circuit
Pickup
DET switch
Flexible wire
Pickup
1-3
KD-SX992R/KD-SX921R
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 compact disc 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.
VARNING : Osynlig laserstrålning är denna del är öppnad
och spårren är urkopplad. Betrakta ej strålen.
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle lasersäteilylle.Älä katso
säteeseen.
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 herein may result in
hazardous radiation exposure.
CAUTION
!
Please use enough caution not to
see the beam directly or touch it
in case of an adjustment or operation
check.
ADVARSEL : Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude af funktion. Undgå
udsættelse for stråling.
ADVARSEL : Usynlig laserstråling ved åpning,når
sikkerhetsbryteren er avslott. unngå utsettelse
for stråling.
REPRODUCTION AND POSITION OF LABELS
WARNING LABEL
CLASS 1
LASER PRODUCT
DANGER : Invisible laser
radiation when open and
interlock or defeated.
AVOID DIRECT EXPOSURE
TO BEAM (e)
ADVARSEL :Usynlig laserstråling ved åbning , når
sikkerhedsafbrydere er ude
af funktion. Undgå udsæt
telse for stråling. (f)
VARNING : Osynlig laserstrålning är denna del
är öppnad och spårren är
urkopplad. Betrakta ej
strålen. (s)
VARO : Avattaessa ja suojalukitus ohitettaessa olet
alttiina näkymättömälle
lasersäteilylle.Älä katso
säteeseen. (d)
1-4
Disassembly method
<Main body>
KD-SX992R/KD-SX921R
Removing the front panel unit
(See Fig.1)
1.
Press the release switch and remove the front panel
unit in the direction of the arrow.
Removing the front chassis
(See Fig.2 to 4)
1.
Remove the two screws A attaching the front
chassis.
2.
Remove the two screws B on each side of the body.
3.
Release the two joints a and the two joints b on the
sides. Release the two joints c at the bottom and
remove the front chassis toward the front.
Eject button
A
Joint a
Front panel assembly
Fig.1
Front chassis assembly
Fig.2
Joint c
Joint c
B
Joint a
Front chassis assembly
Heat sink
Fig.3-1
Fig.3-2Fig.4
Joint b
Joint b
B
Front chassis
assembly
1-5
KD-SX992R/KD-SX921R
Removing the heat sink (See Fig.5)
1.
Remove the two screws C and the two screws D on
the left side of the body.
Removing the bottom cover
(See Fig.6 and 7)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly
and the heat sink.
1.
Turn over the body and unjoint the four joints c and
joint d with the bottom cover and the body using a
screwdriver.
D
Joint c
C
Fig.5
Heat sink
D
Bottom cover
CAUTION:
When disengaging the joint d using a
screwdriver, do not damage or break the
main board.
Joint d
Bottom cover
Joint c
Joint c
Rear panel
Fig.6
Joint c
Joint d
Rear panel
Fig.7
1-6
KD-SX992R/KD-SX921R
Removing the main board
(See Fig.8 and 9)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink and the bottom cover.
1.
Remove the screw E, the three screws F and the
three screws G attaching the rear panel on the back
of the body. Remove the rear panel.
2.
Remove the two screws H attaching the main board
on the bottom of the body. Disconnect connector
CN504 on the main board in the direction of the
arrow.
G
H
Rear panel
G
Fig.8
F
Main board
E
F
G
H
Removing the CD mechanism section
(See Fig.10)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink, the bottom cover and the main board.
1.
Remove the three screws I attaching the CD
mechanism section on the back of the top chassis.
CN504
I
Fig.9
CD mechanism section
I
Fig.10
I
Top chassis
1-7
KD-SX992R/KD-SX921R
Removing the control switch board
(See Fig.11 to 13)
Prior to performing the following procedure, remove
the front panel assembly.
1.
Remove the four screws J attaching the rear cover
on the back of the front panel assembly.
2.
Unjoint the nine joints e with the front panel and the
rear cover.
3.
Remove the control switch board on the back of the
front panel.
Front panel
J
J
Joint e
Rear cover
Fig.11
J
J
Joint e
Front panel
Joint e
Rear cover
Fig.12
Fig.13
Joint e
Control switch board
1-8
< CD mechanism section >
Removing the top cover
(See Fig.1 and 2)
1.
Remove the two screws A on each side of the body.
2.
Lift the front side of the top cover and move the
cover backward to release the two joints a.
Removing the connector board
(See Fig.3 to 5)
Top cover
A
KD-SX992R/KD-SX921R
A
Joints a
CAUTION:
1.
Remove the screw B fixing the connector board.
2.
Solder the short-circuit point on the connector board.
Disconnect the flexible wire from the pickup.
3.
Move the connector board in the direction of the
arrow to release the two joints b.
4.
Unsolder the wire on the connector board if
necessary.
CAUTION:
Before disconnecting the flexible wire
from the pickup, solder the short-circuit
point on the pickup. No observance of
this instruction may cause damage of
the pickup.
Unsolder the short-circuit point after
reassembling.
A
Fig.1
Joints a
Top cover
Fig.2
DET switch
B
Flexible wire
Frame
Connector board
B
Connector board
Joints b
Flexible wire
Short-circuit
Fig.3
Fig.4Fig.5
Pickup
Short-circuit point
(Soldering)
Pickup
1-9
KD-SX992R/KD-SX921R
Removing the DET switch
(See Fig.3 and 6)
1.
Extend the two tabs c of the feed sw. holder and pull
out the switch.
2.
Unsolder the DET switch wire if necessary.
Removing the chassis unit
(See Fig.7 and 8)
Prior to performing the following procedure, remove
the top cover and the connector board.
B
Connector board
Joints b
Short-circuit
Fig.3
DET switch
Pickup
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.
CAUTION:
When reassembling, make sure that the
three shafts on the underside of the
chassis unit are inserted to the dampers
certainly.
Chassis unit
Suspension spring (R)
Suspension spring (L)
Frame
DET switch
Chassis unit
Tab c
Feed sw. holder
Tab c
Fig.6
Shaft
1-10
Suspension spring (R)
Suspension spring (L)
Shafts
Damper
Damper
Damper
Frame
Fig.8Fig.7
Removing the clamper assembly
(See Fig.9 and 10)
KD-SX992R/KD-SX921R
Prior to performing the following procedure, remove
the top cover.
1.
Remove the clamper arm spring.
2.
Move the clamper assembly in the direction of the
arrow to release the two joints d.
Removing the loading / feed motor
assembly (See Fig.11 and 12)
Prior to performing the following procedure, remove
the top cover, the connector board and the chassis
unit.
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.
Clamper arm
spring
Joint d
Joint d
Clamper assembly
Fig.9
Clamper arm spring
Chassis rivet
assembly
Joint d
Clamper assembly
Joint d
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.11.
Chassis rivet assembly
Fig.10
Loading / feed motor assembly
C
Loading / feed motor assembly
Fig.12Fig.11
1-11
KD-SX992R/KD-SX921R
Removing the pickup unit
(See Fig.13 to 17)
Prior to performing the following procedure, remove
the top cover, the connector board and the chassis
unit.
1.
Remove the screw D and pull out the pu. shaft
holder from the shaft.
2.
Remove the screw E attaching the feed sw. holder.
3.
Move the part e of the pickup unit upward with the
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 shaft from the pickup unit.
5.
Remove the screw F attaching the feed rack to the
pickup unit.
Reattaching the pickup unit
(See Fig.13 to 16)
Joint f
Shaft
D
Joint e
Pu. shaft holder
Feed sw. holder
Pickup unit
Fig.13
Pickup unit
E
Joint f
Joint e
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 tab 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 shaft to the pickup unit. Reattach the
pu. shaft holder to the shaft using the screw D.
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.
F
Feed rack
Feed rack
E
Joint g
Feed sw. holder
Part i
Pickup unit
Slot j
Joint g
Feed sw. holder
Fig.14
Shaft
Joint f
Joint h
Fig.15
D
Pu. shaft holder
Pickup unit
1-12
Pickup unit
Feed rack
Joint f
Feed sw. holder
Fig.17Fig.16
Removing the trigger arm
(See Fig.18 and 19)
Prior to performing the following procedure, remove
the top cover, the connector board and the clamper
unit.
1.
Turn the trigger arm in the direction of the arrow to
release the joint k and pull out upward.
KD-SX992R/KD-SX921R
Joint k
Trigger arm
CAUTION:
When reassembling, insert the part l and
m of the trigger arm into the part n and
o at the slot of the chassis rivet
assembly respectively and join the joint
k at a time.
Chassis rivet assembly
Chassis rivet assembly
Trigger arm
Fig.18
Part n
Part o
Part l
Part m
Fig.19
Removing the top plate assembly
(See Fig.20)
Prior to performing the following procedure, remove
the top cover, the connector board, the chassis unit,
and the clamper assembly.
1.
Remove the screw H.
2.
Move the top plate assembly in the direction of the
arrow to release the two joints p.
3.
Unsolder the wire marked q if necessary.
H
Top plate assembly
Joints p
q
Fig.20
1-13
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