JVC KD-SH707 User manual

SERVICE MANUAL
CD RECEIVER
No.49699
Mar. 2002
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
KD-SH707
KD-SH707
Area Suffix
Detachable
ANGLE
RM-RK100
CD
FM
AM
CH
AUX SE L
VOLU ME
R D
AT T
DAB
DISC
PRESET PRESET
DISC
EQ
ATT
INPUT
MP3
MOSFET
E-BASS DISP BAND MODE
200W
EB D B M
KD-SH707
J -------- Northern America
Contents
Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
1-2
1-3
1-4
1-23
Flow of functional
operation unit TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
1-24
1-26
1-26
1-27~51

KD-SH707
1-2
!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.
Safety precaution
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.

KD-SH707
1-3
Front bracket
CD mechanism
control board
Damper bracket
CD mechanism ass’y
FD screw
Feed motor ass’y
FD gear Pickup unit
Preventing static electricity
1.Grounding to prevent damage by 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.
2.About the earth processing for the destruction prevention 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.
2-1 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.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
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.
4.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
Soldering
Attention when traverse unit is decomposed
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate

KD-SH707
1-4
Press the release button in the lower right part of the
front panel assembly to unlock.
Remove the front panel assembly in the direction of
the arrow.
1.
2.
Disassembly method
Removing the front panel assembly
(See Fig.1)
Turn on power.
Press the eject button in the upper left part of the
front panel assembly to move the assembly as
shown in Fig.2 and turn off power.
Remove the two screws Aon the upper side of the
body.
1.
2.
Removing the top chassis
(See Fig.2 to 6)
Fig.1
Fig.2
Front panel assembly
Release button
Front panel assembly
Eject button
Top chassis
Fig.3
Front panel assembly
Top chassis
AA

KD-SH707
1-5
Remove the three screws B on both sides of the
body.
Remove the screw Cand the three screws Don the
left side of the body.
Remove the two screws Eand the screw Fon the
back of the body.
Move the top chassis upward and remove it with the
CD mechanism assembly. The connector on the CD
mechanism assembly is disconnected from
connector CN601 on the main board.
3.
4.
5.
6.
Prior to performing the following procedure, remove
the top cover.
Disconnect the wire from connector CN601 on the
(A) board.
Remove the five screws Gand the MPS board, releasing
the joint aand b.
1.
2.
Removing the MPS board
(See Fig.7)
Fig.6
Fig.7
Fig.4
Fig.5
BB
Top chassis
Top chassis
BD
C
EF
G
ab
CN601
G
Heat sink
MPS board

KD-SH707
1-6
Prior to performing the following procedure, remove
the top chassis.
Remove the three screws Hinside the top chassis
and remove the CD mechanism assembly.
1.
Removing the CD mechanism assembly
(See Fig.8)
Prior to performing the following procedure, remove
the top chassis.
Disconnect the wire from connector CN703 on the
main board.
Remove the motor bracket and the spring attached
to the arm braket assembly (R).
Remove the two screws Iattaching the motor
bracket.
Remove the washer attaching the clutch assembly
and pull out the clutch assembly from the shaft.
Remove the two screws Jand the motor assembly
from the motor bracket.
1.
2.
3.
4.
5.
Removing the motor assembly
(See Fig.9 to 11)
Fig.8
Fig.9
Fig.10
Fig.11
Top chassis H
H
CD mechanism assembly
Arm braket assembly (R)
Motor assembly
Motor braket
Spring
Motor assembly
Motor braket
Motor bracket
CN703
I
I
Main board
J
Clutch assembly
Washer
H

KD-SH707
1-7
Prior to performing the following procedures, remove
the top chassis and the motor bracket.
Disconnect the flexible wire from connector CN701
and CN702 on the main board respectively.
Move the front bracket backward until it stops.
Remove the four screws Kattaching the arm
brackets (L) and (R). Move the right and arm lefter
brackets from the rod gear.
Remove the rod gear.
Remove the screw Mattaching the rear panel to the
bottom cover on the back of the body.
1.
2.
3.
4.
5.
Removing the main board
(See Fig.12 to 16)
L
L
Fig.14
Fig.13
Fig.12
Main board
K
K
K
Arm
brackets (L)
Arm
brackets (R)
CN701 CN702 Rod gear
Arm brackets (L)
Arm brackets (R)
Main board
Rod gear
Bottom cover
M
Rear panel

KD-SH707
1-8
Remove the two screws Land move the main board
backwards to release the two joints c. (The main
board will be removed with the rear panel and the
rear heat sink)
Remove the screw Nand Qattaching the rear heat
sink.
Remove the three screws Oand the screw P
attaching the rear panel. Remove the main board.
6.
7.
8.
Prior to performing the following procedures, remove
the top chassis, the motor bracket and the main
board.
Remove the two screws Rattaching the lifter switch
board.
1.
Removing the lifter switch board
(See Fig.17)
Fig.16
Fig.15
Fig.17
Joint c
Joint c Main board
Rear panel
ON
Q
PRear heat sink
Bottom cover
Lifter switch board
R

KD-SH707
1-9
Prior to performing the following procedure, remove
the top chassis assembly and the front panel
assembly.
Disconnect the flexible wire from connector CN702
on the main board.
Remove the four screws Sattaching the front
bracket on both sides of the body.
Push the pin of the joint don the front of the front
bracket to release the lock lever.
1.
2.
3.
Removing the lifter board
(See Fig.18 to 24)
Fig.18
Fig.19
Fig.20Fig.21
Front bracket
Main board
CN702
Front bracket
Front bracket
S
S
Lock lever
Front bracket
Joint d

KD-SH707
1-10
Remove the screw Tattaching the lifter board cover
in the rear of the front bracket.
Release the two joints fwhile pushing the front side.
Move the lifter board cover in the direction of the
arrow and release the eight joints e.
Remove the two screws Uattaching the lifter board
on the front of the body.
4.
5.
6.
Fig.22
Fig.23
Fig.24
Joints e
Joints e
Joints e
Joint e
T
Joint f
Joint f
Front bracket
Lifter board cover
Lifter board
Lifter board cover
U

KD-SH707
1-11
Remove the four screws Vattaching the rear panel
to the front panel assembly.
Release the eleven joints gof the front panel and the
rear panel.
Disconnect the wire from connector CN803 on the
front board.
If necessary, unsolder the front board.
1.
2.
3.
4.
<Front panel assembly>
Removing the front board
(See Fig.25 and 26)
Prior to performing the following procedure, remove
the rear panel.
Remove the four screws Wattaching the volume
board.
Disconnect the volume knob, ring lens and volume
ring from the volume board.
If necessary, unsolder the volume board.
1.
2.
3.
Removing the volume board
(See Fig.26 and 27)
Prior to performing the following procedure, remove
the rear panel.
Disconnect the wire from connector CN803 on the
front board.
Pull out the line in board from the front panel
assembly.
1.
2.
Removing the line in board
(See Fig.26 and 28)
Prior to performing the following procedure, remove
the front panel assembly.
Fig.25
Fig.26
Fig.27
Fig.28
Joint g 11
Rear panel
V
V
V
V
Front board
Soldering
Soldering
Volume board
W
W
W
W
CN803
Line in board
Ring knob
Volume lens, Volume ring
Volume board
Line in board

KD-SH707
1-12
Remove the two screws Aon each side of the body.
Lift the front side of the top cover and move the
cover backward to release the two joints a.
1.
2.
Removing the top cover
(See Fig.1 and 2)
Remove the screw Bfixing the connector board.
Solder the short-circuit point on the connector board.
Disconnect the flexible wire from the pickup.
Move the connector board in the direction of the
arrow to release the two joints b.
Unsolder the wire on the connector board if
necessary.
1.
2.
3.
4.
Removing the connector board
(See Fig.3 to 5)
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.
CAUTION:
Unsolder the short-circuit point after
reassembling.
CAUTION:
Fig.1
Fig.2
Fig.3
Fig.4Fig.5
A
A
A
B
B
Joints a
Joints a
Top cover
Top cover
Connector board
DET switch
Pickup
Pickup
Short-circuit
Joints b
Short-circuit point
(Soldering)
Flexible wire
Flexible wire
Connector board
Frame
< CD mechanism section >

KD-SH707
1-13
Extend the two tabs cof the feed sw. holder and pull
out the switch.
Unsolder the DET switch wire if necessary.
1.
2.
Removing the DET switch
(See Fig.3 and 6)
Prior to performing the following procedure, remove
the top cover and the connector board.
Remove the two suspension springs (L) and (R)
attaching the chassis unit to the frame.
1.
Removing the chassis unit
(See Fig.7 and 8)
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.
CAUTION:
Fig.3
Fig.6
Fig.8Fig.7
B
Connector board
DET switch
DET switch
Pickup
Short-circuit
Joints b
Tab c
Feed sw. holder
Tab c
Suspension spring (L)
Suspension spring (L)
Suspension spring (R)
Suspension spring (R)
Chassis unit
Chassis unit
Frame
Frame
Shafts
Shaft
Damper
Damper
Damper

KD-SH707
1-14
Prior to performing the following procedure, remove
the top cover, the connector board and the chassis
unit.
Remove the screw Cand move the loading / feed
motor assembly in the direction of the arrow to
remove it from the chassis rivet assembly.
Disconnect the wire from the loading / feed motor
assembly if necessary.
1.
2.
Removing the loading / feed motor
assembly (See Fig.11 and 12)
Prior to performing the following procedure, remove
the top cover.
Remove the clamper arm spring.
Move the clamper assembly in the direction of the
arrow to release the two joints d.
1.
2.
Removing the clamper assembly
(See Fig.9 and 10)
When reassembling, connect the wire
from the loading / feed motor assembly
to the flame as shown in Fig.11.
CAUTION:
Fig.9
Fig.10
Fig.12Fig.11
Clamper arm
spring
Clamper arm spring
Chassis rivet
assembly
Joint d
Joint d Clamper assembly
Clamper assembly
Joint d
Joint d
Chassis rivet assembly
Loading / feed motor assembly
Loading / feed motor assembly
C

KD-SH707
1-15
Reattach the feed rack to the pickup unit using the
screw F.
Reattach the feed sw. holder to the feed rack while
setting the joint tab gto the slot of the feed rack and
setting the part fof the feed rack to the switch of the
feed sw. holder correctly.
As the feed sw. holder is temporarily attached to the
pickup unit, set to the gear of the joint gand to the
bending part of the chassis (joint h) at a time.
1.
2.
3.
Reattach the feed sw. holder using the screw E.
Reattach the shaft to the pickup unit. Reattach the
pu. shaft holder to the shaft using the screw D.
4.
5.
Reattaching the pickup unit
(See Fig.13 to 16)
Prior to performing the following procedure, remove
the top cover, the connector board and the chassis
unit.
Remove the screw Dand pull out the pu. shaft
holder from the shaft.
Remove the screw Eattaching the feed sw. holder.
Move the part eof 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 gof the pickup unit and the feed rack is
released, and the feed sw. holder comes off.
Remove the shaft from the pickup unit.
Remove the screw Fattaching the feed rack to the
pickup unit.
1.
2.
3.
4.
5.
Removing the pickup unit
(See Fig.13 to 17)
Make sure that the part ion the underside
of the feed rack is certainly inserted to the
slot jof the change lock lever.
CAUTION:
Fig.13
Fig.14
Fig.15
Fig.17Fig.16
Feed sw. holder
Feed sw. holder
Feed sw. holder
E
D
D
E
F
Joint f
Joint f
Joint f
Joint g
Joint f
Joint e
Joint e
Pickup unit
Pu. shaft holder
Pu. shaft holder
Shaft
Shaft
Feed rack
Feed rack
Pickup unit
Pickup unit
Feed sw. holder
Pickup unit
Feed rack
Pickup unit
Joint h
Part i
Slot j
Joint g

KD-SH707
1-16
Prior to performing the following procedure, remove
the top cover, the connector board, the chassis unit,
and the clamper assembly.
Remove the screw H.
Move the top plate assembly in the direction of the
arrow to release the two joints p.
Unsolder the wire marked qif necessary.
1.
2.
3.
Removing the top plate assembly
(See Fig.20)
Prior to performing the following procedure, remove
the top cover, the connector board and the clamper
unit.
Turn the trigger arm in the direction of the arrow to
release the joint kand pull out upward.
1.
Removing the trigger arm
(See Fig.18 and 19)
When reassembling, insert the part land
mof the trigger arm into the part nand
oat the slot of the chassis rivet
assembly respectively and join the joint
kat a time.
CAUTION:
Fig.18
Fig.19
Fig.20
Joint k
Trigger arm
Trigger arm
Chassis rivet assembly
Chassis rivet assembly
Part n
Part l
Part m
Part o
Top plate assembly
Joints p
q
H

KD-SH707
1-17
Reattach the select lock arm spring to the top plate
and set the shorter end of the select lock arm spring
to the hook uon the top plate.
Set the other longer end of the select lock arm spring
to the boss von the underside of the select lock arm,
and join the select lock arm to the slots (joint t). Turn
the select lock arm as shown in the figure.
Reattach the select arm (L) while setting the part rto
the first peak of the link plate gear, and join the joint
s.
1.
2.
3.
Reassembling the select arm (L) / select
lock arm (See Fig.23 to 25)
Prior to performing the following procedure, remove
the top plate assembly.
Bring up the select arm (L) to release from the link
plate (joint r) and turn in the direction of the arrow to
release the joint s.
Unsolder the wire of the select arm (L) marked qif
necessary.
Turn the select lock arm in the direction of the arrow
to release the two joints t.
The select lock arm spring comes off the select lock
arm at the same time.
1.
2.
3.
Removing the select arm (L) / select lock
arm (See Fig.21 and 22)
When reattaching the select arm (L),
check if the points wand xare correctly
fitted and if each part operates properly.
CAUTION:
Reverse the above removing procedure.
REFERENCE:
Fig.21
Fig.22
Fig.23
Fig.25Fig.24
Top plate
Top plate
Select arm (L)
Select lock arm
Select lock arm
Select lock
arm spring
Select lock arm
Select lock arm
Select
lock arm
Joint r
Link plate
Link plate
Joint z
Joint z
Joint a'
Select arm (R)
Joint y Joint s q
Link plate spring
Joint b'
Joints t
Hook u
Hook u
Boss v
Select lock arm spring
Joint t
Joint t
Link plate
Joint r
Point x
Select arm (L)
Select arm (R) Joint a'
Joint b'
Link plate spring
Joint r
Joint s

KD-SH707
1-18
Reattach the link plate spring.
Reattach the link plate to the link plate spring while
joining them at joint b’.
Reattach the part yof the select arm (R) to the first
peak of the link plate while joining the two joints z
with the slots. Then turn the select arm (R) as shown
in the figure. The top plate is joined to the joint a’.
1.
2.
3.
Reattaching the Select arm (R) / link
plate (See Fig.25 and 26)
Prior to performing the following procedure, remove
the top plate assembly.
Bring up the select arm (R) to release from the link
plate (joint y) and turn as shown in the figure to
release the two joints zand joint a’.
Move the link plate in the direction of the arrow to
release the joint b’. Remove the link plate spring at
the same time.
1.
2.
Removing the select arm (R) / link plate
(See Fig.21 and 22)
When reattaching the select arm (R),
check if the part c’ is correctly fitted and
if each part operates properly.
CAUTION:
Reverse the above removing procedure.
REFERENCE:
Before removing the link plate, remove
the select arm (L).
REFERENCE:
Fig.26
Fig.21
Fig.22
Top plate
Top plate
Select arm (L)
Select lock arm
Select lock arm
Select lock
arm spring
Select lock arm
Joint r
Link plate
Link plate
Link plate
Joint z
Joint z
Joint a'
Select arm (R)
Part y Joint s q
Link plate spring
Joint b'
Joints t
Hook u
Fig.25
Select
lock arm
Point x
Select arm (L)
Select arm (R) Joint a'
Joint b'
Link plate spring
Part y
Joint z
Joint z Part y

KD-SH707
1-19
Prior to performing the following procedure, remove
the clamper assembly and the top plate assembly.
Push inward the loading roller assembly on the gear
side and detach it upward from the slot of the joint d’
of the lock arm rivet assembly.
Detach the loading roller assembly from the slot of
the joint e’of the lock arm rivet assembly.
The roller guide comes off the gear section of the
loading roller assembly.
Remove the roller guide and the washer from the
shaft of the loading roller assembly.
Remove the screw Iattaching the lock arm rivet
assembly.
Push the shaft at the joint f’of the lock arm rivet
assembly inward to release the lock arm rivet
assembly from the slot of the slide plate. Extend the
lock arm rivet assembly outward and release the
joint g’from the boss of the chassis rivet assembly.
The roller guide springs on both sides come off.
1.
2.
3.
Removing the loading roller assembly
(See Fig.27 to 29)
When reassembling, reattach the left
and right roller guide springs to the lock
arm rivet assembly before reattaching
the lock arm rivet assembly to the
chassis rivet assembly. Make sure to fit
the part h’of the roller guide spring (L)
inside of the roller guide (Refer to
Fig.30).
CAUTION:
Fig.27
Fig.28-1
Fig.28-2
Fig.29Fig.30
Roller guide
Roller guide spring
Roller guide spring
Roller guide spring
Roller guide
spring
Roller guide
spring
Roller guide spring
Roller guide
Washer
Loading roller assembly
Loading roller assembly
Loading roller assembly
Loading roller assembly
Joint e'
Joint d'
Lock arm rivet assembly
Chassis rivet assembly
Boss
Slide plate
Joint f'
Part g'
Lock arm rivet assembly
I
Roller guide
Washer
Frame
Roller guide spring
Loading roller
Roller shaft assembly
Joint h'

KD-SH707
1-20
Prior to performing the following procedure, remove
the top cover, the chassis unit and the top plate
assembly.
Remove the screw Jattaching the loading gear
bracket. The loading gear (6) and (7) come off the
loading gear bracket.
Pull out the loading gear (5).
1.
2.
Removing the loading gear (5), (6) and
(7) (See Fig.31 and 32)
Fig.31
Fig.32
J
J
Loading gear bracket
Loading gear bracket
Loading gear (6)
Loading gear (5)
Loading gear (6)
Loading gear (5) Loading gear (7)
Loading gear (3)