JVC KD-LH70R User manual
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.49803
2003/04
KD-LH70R
CD RECEIVER
49803200304
KD-LH70R
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23
SOUND
VOL VOL
SOURCE
RF
U
D
ATT
Area Suffix
E ---- Continental Europe
EX -------- Central Europ
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-2 (No.49803)
SECTION 1
Important Safety Precautions
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.
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)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 DVD 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 CDpickup 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
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-4 (No.49803)
SECTION 2
Disassembly method
2.1 Main body
2.1.1 Removing the front panel assembly
(See Fig.1)
(1) Push the detach button in the lower left part of the front
panel and remove the front panel assembly in the direction
of the arrow.
Fig.1
2.1.2 Removing the front chassis assembly
(See Figs.2 to 4)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws Aon the both sides of the main
body.
(2) Remove the two screws Bon the front side of the main
body.
(3) Release the two joints aand two joints bon both sides of
the main body.
(4) Release the two joints con the bottom side of the main
body and remove the front chassis assembly in the direc-
tion of the arrow.
Fig.2
Fig.3
Fig.4
Front panel assembly
Detach button
Joint a
Joint a
Front chassis assembly
A
Joint b
Joint b
A
B
Front chassis assembl
y
Joint cJoint c
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-5
2.1.3 Removing the heat sink
(See Fig.5)
(1) Remove the two screws Cand two screws Don the left
side of the main body.
Fig.5
2.1.4 Removing the bottom cover
(See Figs.6 and 7)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly and heat sink.
(1) Turn over the main body and release the two joints d, two
joints eand joint f.
CAUTION:
Do not damage the main board when releasing the joint fus-
ing a screwdriver. (See Figs.6 and 7)
Fig.6
Fig.7
C
DHeat sink
Joint d
Joint e
Joint f
Bottom cover
Joint e
Joint d
Joint f
Bottom cover
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-6 (No.49803)
2.1.5 Removing the rear bracket
(See Fig.8)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink and bottom
cover.
(1) Remove the three screws E, two screws Fand two screws
Gon the back side of the main body.
(2) Remove the rear bracket.
REFERENCE:
During reassembly, before fixing the rear bracket onto the
main body, insert the Subwoofer and steering cables into the
slots.
Fig.8
2.1.6 Removing the main board
(See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink, bottom
cover and rear bracket
(1) Remove the two screws Hattaching the main board.
(2) Disconnect the connector CN101 and remove the main
board.
Fig.9
2.1.7 Removing the mecha control board
(See Fig. 10)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink, bottom
cover, rear bracket and main board.
(1) Remove the five screws Jattaching the mecha control
board.
(2) Disconnect the card wire from the mecha connector.
(3) Move the mecha control board in the direction of the arrow
to release it from the joint g.
Fig.10
G
EE
F
Rear bracket G
Insert Subwoofer and steering
cables into the slots.
Main board
H
H
CN101
J
J
Mecha control board
Mecha
connector
Card wire
Top chassis
Joint g
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-7
2.1.8 Removing the CD mechanism assembly
(See Fig. 11)
• Prior to performing the following procedure, remove the front
panel assembly, front chassis assembly, heat sink, bottom
cover, rear bracket, main board and CD mecha board.
(1) Remove the three screws K.
Fig.11
2.1.9 Removing the front board
(See Figs. 12 to 14)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws Lon the back side of the front
panel assembly.
(2) Release the nine joints h.
(3) Take out the front board.
Fig.12
Fig.13
Fig.14
K
K
CD mechanism assembly Top chassis
L
L
L
Joint h
Joint h
Joint h
Joint h
Rear cover
Front board
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-8 (No.49803)
2.2 CD mechanism section
2.2.1 Removing the top cover
(See Figs.1 and 2.)
(1) Remove the four 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
2.2.2 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 pickup.
(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 wires on the connector board if necessary.
CAUTON:
Unsolder the short-circuit point after reassembling.
Fig.3
Fig.4
Fig.5
A
A
A
Joints a
Top cover
Joints a
Top cover
B
Connector board
Pickup
Short-circuit point
Joints b
Wires Pickup
Short-circuit point
(Soldering)
Flexible wire
B
Flexible wire
Connector board
Frame
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-9
2.2.3 Removing the DET switch
(See Figs.6 and 7.)
(1) Extend the two tabs cof the feed sw. holder and pull out
the switch.
(2) Unsolder the DET switch wire if necessary.
Fig.6
Fig.7
2.2.4 Removing the chassis unit
(See Figs.8 and 9.)
• Prior to performing the following procedure, remove the top
cover and connector board.
(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 cer-
tainly.
Fig.8
Fig.9
Connector
board
DET
switch
Pickup
DET switch Tab c
Tab c
DET switch wire
Feed sw. holder
Suspension spring (L)
Suspension spring (L)
Suspension spring (R)
Suspension spring (R)
Chassis unit
Frame
Chassis unit
Frame
Shafts
Shaft
Dampe
r
Damper
Damper
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-10 (No.49803)
2.2.5 Removing the clamper assembly
(See Figs.10 and 11.)
• 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.
Fig.10
Fig.11
2.2.6 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.
(1) Remove the screw Cand 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 frame as shown in Fig.12.
Fig.12
Fig.13
Clamper arm
spring
Chassis rivet
assembly
Joint d
Joint d Clamper assembly
Clamper arm spring
Clamper assembly
Joint d
Joint d
Chassis rivet assembly
Loading / feed motor assembly
Loading / feed motor assembly
C
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-11
2.2.7 Removing the pickup unit
(See Figs.14 to 18.)
• Prior to performing the following procedure, remove the top
cover, connector board and chassis unit.
(1) Remove the screw Dand pull out the pu. shaft holder from
the pu. shaft.
(2) Remove the screw Eattaching the feed sw. holder.
(3) Move the part eof the pickup unit upward with the pu. shaft
and the feed sw. holder, then release the joint fof 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.
(4) Remove the pu. shaft from the pickup unit.
(5) Remove the screw Fattaching the feed rack to the pickup
unit.
2.2.8 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 gto the slot of the feed rack and setting the joint f
of the feed rack to the switch of the feed sw. holder correct-
ly.
(3) 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.
CAUTION:
Make sure that the part ion the underside of the feed
rack is certainly inserted to the slot jof the change lock
lever.
(4) Reattach the feed sw. holder using the screw E.
(5) Reattach the pu. shaft to the pickup unit. Reattach the pu.
shaft holder to the pu. shaft using the screw D.
Fig.14
Fig.15
Fig.16
Fig.17
Fig.18
Feed sw. holder
E
D
Joint g
Joint f
Part e
Pickup unit
Pu. shaft holder
Pu. shaft
Feed sw. holder
Part e
Pickup unit
Feed rack
Feed sw. holder
D
E
Joint f
Pu. shaft holde
r
Pu. shaft
Pickup unit
Joint h
Part i
Slot j
Joint g
FFeed rack
Pickup unit
Joint f
Joint g
Feed rack
Pickup unit
Feed sw. holder
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-12 (No.49803)
2.2.9 Removing the trigger arm (See Figs.19 and 20.)
• Prior to performing the following procedure, remove the top
cover, connector board and clamper unit.
(1) Turn the trigger arm in the direction of the arrow to release
the joint kand pull out upward.
CAUTION:
When reassembling, insert the part mand nof the trigger arm
into the part pand qat the slot of the chassis rivet assembly
respectively and join the joint kat a time.
Fig.19
Fig.20
2.2.10 Removing the top plate assembly
(See Fig.21.)
• Prior to performing the following procedure, remove the top
cover, connector board, chassis unit, and clamper assembly.
(1) Remove the screw H.
(2) Move the top plate assembly in the direction of the arrow to
release the two joints r.
(3) Unsolder the wire marked sif necessary.
Fig.21
Joint k
Trigger arm
Chassis rivet assembly
Trigger arm
Chassis rivet assembly
Part p
Part m
Part n
Part q
Top plate assembly
Joints
r
s
H
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-13
2.2.11 Removing the mode sw. / select lock arm
(See Figs.22 and 23.)
• Prior to performing the following procedure, remove the top
plate assembly.
(1) Bring up the mode sw. to release from the link plate (joint t)
and turn in the direction of the arrow to release the joint u.
(2) Unsolder the wire of the mode sw. marked sif necessary.
(3) Turn the select lock arm in the direction of the arrow to re-
lease the two joints v.
(4) The select lock arm spring comes off the select lock arm
at the same time.
Fig.22
Fig.23
2.2.12 Reassembling the mode sw. / select lock arm
(See Figs.24 to 26.)
REFERENCE:
Reverse the above removing procedure.
(1) Reattach the select lock arm spring to the top plate and set
the shorter end of the select lock arm spring to the hook w
on the top plate.
(2) Set the other longer end of the select lock arm spring to the
boss xon the underside of the select lock arm, and join the
select lock arm to the slots (joint v). Turn the select lock
arm as shown in the figure.
(3) Reattach the mode sw. while setting the part tto the first
peak of the link plate gear, and join the joint u.
CAUTION:
When reattaching the mode sw., check if the points y and zare
correctly fitted and if each part operates properly.
Fig.24
Fig.25
Fig.26
Mode sw.
Select lock arm
Joint t
Link plate
Joint u s
Top plate
Top plate
Select lock arm
Select lock
arm spring
Select lock arm
Link plate
Joints v
Hook w
Select lock arm
Hook w
Boss x
Select lock arm spring
Joint v
Joint v
Link plate
Joint t
Point z
Point y
Select
lock arm
Mode sw.
Joint t
Joint u
Link plate
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-14 (No.49803)
2.2.13 Removing the select arm R / link plate
(See Figs.27 and 28.)
• Prior to performing the following procedure, remove the top
plate assembly.
(1) Bring up the select arm Rto release from the link plate
(joint a') and turn as shown in the figure to release the two
joints b' and joint C'.
(2) Move the link plate in the direction of the arrow to release
the joint d'. Remove the link plate spring at the same time.
CAUTION:
Before removing the link plate, remove the mode sw.
Fig.27
Fig.28
2.2.14 Reattaching the Select arm R / link plate
(See Figs.29 and 30)
REFERENCE:
Reverse the above removing procedure.
(1) Reattach the link plate spring.
(2) Reattach the link plate to the link plate spring while joining
them at joint d'.
(3) Reattach the joint a' of the select arm Rto the first peak of
the link plate while joining the two joints b' with the slots.
Then turn the select arm Ras shown in the figure. The top
plate is joined to the joint c'.
CAUTION:
When reattaching the select arm R, check if the points e' and
f' are correctly fitted and if each part operates properly.
Fig.29
Fig.30
Joint r
Link plate
Joint b'
Joint b'
Joint c'
Select arm R
Joint a'
Top plate
Link plate
Link plate spring
Joint d'
Select arm R Joint c'
Joint d'
Link plate spring
Joint b'
Joint b' Joint a'
Link plate
Joint a'
Point e' Point f'
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-15
2.2.15 Removing the loading roller assembly
(See Figs.31 to 33.)
• Prior to performing the following procedure, remove the
clamper assembly and top plate assembly.
(1) Push inward the loading roller assembly on the gear side
and detach it upward from the slot of the joint g' of the lock
arm rivet assembly.
(2) Detach the loading roller assembly from the slot of the joint
h' 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 HL washer from the shaft
of the loading roller assembly.
(3) Remove the screw Jattaching the lock arm rivet assembly.
(4) Push the shaft at the joint i' of the lock arm rivet assembly
inward to release the lock arm rivet assembly from the slot
of the Lside plate.
(5) Extend the lock arm rivet assembly outward and release
the joint j' from the boss of the chassis rivet assembly. The
roller guide springs on both sides come off at the same
time.
CAUTION:
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 k' of the roller guide spring inside of the roller
guide. (Refer to Fig.34.)
Fig.31
Fig.32
Fig.33
Fig.34
Roller guide
Roller guide spring
Roller guide spring
Roller guide spring
Roller guide
HL washer
Loading roller assembly
Loading roller assembly
Joint h'
Joint g'
Lock arm rivet assembly
Roller guide
spring
Roller guide
spring
Loading roller assembly
Loading roller assembly
Part k'
Roller guide spring
Boss
L side plate
Joint i'
Joint j'
Lock arm rivet assembly
J
Chassis rivet assembly
Roller guide
HL washer
Lock arm rivet assembly Roller guide spring
Loading roller
Roller shaft assembly
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-16 (No.49803)
2.2.16 Removing the loading gear 5, 6 and 7
(See Figs.35 and 36.)
• Prior to performing the following procedure, remove the top
cover, chassis unit, pickup unit and top plate assembly.
(1) Remove the screw Kattaching the loading gear bracket.
The loading gear 6 and 7 come off the loading gear brack-
et.
(2) Pull out the loading gear 5.
Fig.35
Fig.36
KLoading gear bracket
Loading gear 6
Loading gear 5
Loading gear 3
K
Loading gear bracket
Loading gear 6
Loading gear 5 Loading gear 7
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-17
2.2.17 Removing the gears
(See Figs.37 to 40.)
• Prior to performing the following procedure, remove the top
cover, chassis unit, top plate assembly and pickup unit.
Pull out the loading gear 3. (See Fig.35.)
(1) Pull out the feed gear.
(2) Move the loading plate assembly in the direction of the ar-
row to release the Lside plate from the two slots m' of the
chassis rivet assembly. (See Fig.37.)
(3) Detach the loading plate assembly upward from the chas-
sis rivet assembly while releasing the joint n'. Remove the
slide hook and loading plate spring from the loading plate
assembly.
(4) Pull out the loading gear 2 and remove the change lock le-
ver.
(5) Remove the Ering and washer attaching the change gear
2.
(6) The change gear 2, change gear spring and adjusting
washer come off.
(7) Remove the loading gear 1.
(8) Move the change plate rivet assembly in the direction of the
arrow to release from the three shafts of the chassis rivet
assembly upward. (See Fig.38.)
(9) Detach the loading gear plate rivet assembly from the shaft
of the chassis rivet assembly upward while releasing the
joint p'. (See Figs.38 and 40.)
(10) Pull out the loading gear 4.
Fig.37
Fig.38
Fig.39
Fig.40
Slot m'
Slot m'
Joint n'
Feed gear
Loading plate assembly
L side plate
Chassis rivet assembly
Joint p'
Loading gear 4
Loading gear 2
Loading gear 1
Change gear 2
Loading gear plate
rivet assembly
E ring
Shafts
Change plate
rivet assembly
Shaft
Chassis rivet assembly
Loading plate assembly
Loading plate spring
Chassis rivet assembly
Slot m'
Slot m'
Joint n'
L side plate
Slide hook
Loading gear 2
Loading gear 4
Change gear 2
Loading gear 1
E ring
Washer
Change gear spring
Loading gear plate rivet assembly
Chassis rivet assembly
Adjusting washer
Change plate
rivet assembly
Change lock lever
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-18 (No.49803)
2.2.18 Removing the turn table / spindle motor
(See Figs.41 and 42.)
• Prior to performing the following procedure, remove the top
cover, connector board, chassis unit and clamper assembly.
(1) Remove the two screws Lattaching the spindle motor as-
sembly through the slot of the turn table on top of the body.
(2) Unsolder the wire on the connector board if necessary.
Fig.41
Fig.42
L
Turn table
L
Turn table
Spindle motor
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
(No.49803)1-19
SECTION 3
Adjustment
3.1 Adjustment method
Test instruments required for adjustment
1. Digital oscilloscope (100MHz)
2. AM Standard signal generator
3. FM Standard signal generator
4. Stereo modulator
5. Electric voltmeter
6. Digital tester
7. Tracking offset meter
8. Test Disc JVC :CTS-1000
9. Extension cable for check
EXTSH002-22P 1
Standard measuring conditions
Power supply voltage DC14.4V(11~16V)
Load impedance 20Kohm(2 Speakers connection)
Output Level Line out 2.0V (Vol. MAX)
Standard volume position
Balance and Bass &Treble volume : lndication"0"
Loudness : OFF
Frequency Band
FM 87.5MHz ~ 108.0MHz
AM (MW) 522kHz ~ 1620kHz
(LW) 144kHz ~ 279kHz
Dummy load
Exclusive dummy load should be used for AM,and FM. For
FM dummy load,there is a loss of 6dB between SSG output
and antenna input.The loss of 6dB need not be considered
since direct reading of figures are applied in this working
standard.
How to connect the extension cable for adjusting
The cardboard is cut in a suitable size.
uses for the insulation stand of mechanism.
EXTSH002-22P
Extension cable
Caution:
Be sure to attach the heat sink and rear
bracket onto the power amplifier IC301
and regulator IC901 respectively,
before supply the power.
If voltage is applied without attaching
these parts, the power amplifier IC
and regulator IC will be destroyed
by heat.
Heat sink
(Attach the heat sink
using the two screws.)
Rear bracket
(Attach the rear bracket
using the screw.)
Front chassis assembly
(Attach the front chassis assembly using the two screws.)
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
KD-LH70R
1-20 (No.49803)
3.2 Flow of functional operation unit TOC read
When the pickup correctly moves
to the inner area of the disc
v
Microprocessor
commands
FMO
TC94A14FA "40"
FEED MOTOR
+TERMINAL
IC681 "4"
REST SW
When correctly focused
Focus Servo Loop ONo
Disc inserted
Pickup feed to the inner area
YES
Laser emitted
Focus search
YES
Disc rotates
RF signal eye-pattern
remains closed
n
Tracking loop closed
RF signal eye-pattern
opens
TOC read out
Jump to the first track
Play
When the laser diode correctly
emits
Microprocessor
commands
SEL
TC94A14FA "38"
LD
CN601 "10"
"No disc"
display
When the disc correctly rotates
Microprocessor
commands
DMO
TC94A14FA "41"
Spindle
motor(-)
IC681 "7"
Tracking Servo Loop ON
RF signal
Rough Servo Modev
CLV Servo Mode
(Program Area)
CLV Servo Mode
(Lead-In Area;
Digital :0)
$83 $82 $81
0V
6V
4V
2V
OFF
ON
3.3V
Hi-Z
FEO
TA2157 "15"
2.2V
$84
3.3V
0V
4V
0V
$84 $86 $ A200
3.3V
2.2V
0V
6V
3.2
2V
Rough
Servo
Acceleration Servo CLV
0.5 Sec0.5 Sec
Power ON
Set Function CD
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
Other manuals for KD-LH70R
1
Other JVC Car Receiver manuals
