JVC KS-LH6R Service Manual

SERVICE MANUAL

CASSETTE RECEIVER

KS-LH6R

SOUND

6

U

SOURCE

F

R

D

VOL

VOL

TAPE

S

KS-LH6R

Contents

Safety precaution
Disassembly method
Adjustment method
Description of major ICs

COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

Area Suffix

E ----------- Continental Europe

1- 2
1- 3
1-11
1-15~26

No.49734

Apr. 2002

KS-LH6R

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.

1-2

Disassembly method

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.

KS-LH6R

Front panel unit

Removing the bottom cover

(See Fig.2,3)

1.

Turn the body upside down.

2.

Insert a screwdriver to the two joints a and two joints
b on both sides of the body and the joint c on the
back of the body, then detach the bottom cover from
the body.

CAUTION:

When disengaging the joint c using a
screwdriver, do not damage or break the
board.

Removing the front chassis (See Fig.4,5)

Prior to performing the following procedure, remove
the bottom cover.

1.

Remove the two screws A attaching the front
chassis.

Fig.1

Joint a

Bottom cover

Joint c

Joint b

Fig. 2

Joint b

Bottom cover

2.

Remove the two screws B on each side of the body.

3.

Release the two joints d and the two joints e on the
sides. remove the front chassis toward the front.

Joint d

Joint d

B

Front chassis

Fig. 5

Joint e

Joint e

Joint a

A

Joint c

Fig. 3

Front chassis

Fig.4

1-3

KS-LH6R

Removing the heat sink (See Fig.6)

1.

Remove the four screws C attaching the heat sink
on the left side of the body, and remove the heat
sink.

Removing the rear panel (See Fig.7 )

C

C

Heat sink

Fig. 6

C

Prior to performing the following procedure, remove
the front chassis, the heat sink and bottom cover.

1.

Remove the five screws D attaching the rear panel
and one screw E attaching the pine jack on the back
of the body.

D

Rear panel

Removing the main amplifier board assembly

(See Fig.8)

Prior to performing the following procedure, remove
the front chassis, the heat sink, bottom cover and the
rear panel.

F

E

D

D

Fig. 7

F

1.

Remove the two screws F attaching the main
amplifier board assembly on the top cover.

2.

Disconnect connector CP401 on the main amplifier
board assembly from the cassette mechanism
assembly.

1-4

Main board assembly

Fig. 8

CP401

KS-LH6R

Removing the cassette mechanism assembly

Cassette mechanism assembly

(See Fig.9)

Prior to performing the following procedure, remove
the front chassis, the heat sink, bottom cover and the
main amplifier board assembly.

1.

Remove the four screws G attaching the cassette
mechanism assembly from the top cover.

G

G

H

Removing the (LCD & key) control switch

board (See Fig.10

Prior to performing the following procedure, remove
the front panel assembly.

~ 12)

G

G

Top cover

Fig. 9

H

1.

Remove the four screws H attaching the rear cover
on the back of the front panel assembly.

2.

Unjoint the nine joints g with the front panel and the
rear cover.

3.

Remove the control switch board on the back of the
front panel.

H

Front panel

Joint g

LCD & Key control board

Joint g

H

Fig. 10

Rear cover

Joint g

Joint g

Fig. 11

Fig. 12

1-5

KS-LH6R

<Cassette mechanism section>

REFERENCE:

Prior to performing the following
procedures, turn the mode gear on the
bottom of the body until the respective part
comes to the EJECT position (Refer to
Fig.1).

Removing the reinforce bracket

(See Fig.1 and 2)

1.

Remove the screw A attaching the reinforce bracket
on the bottom of the body.

2.

To release joint a, turn and detach the reinforce
bracket from the side bracket assembly as shown in
Fig.2

Removing the cassette guide (See Fig.3)

1.

Turn the mode gear to set to RVS play or
subsequent mode.

2.

Remove the cassette guide from the main chassis
while releasing each two joint tabs b in the direction
of the arrow.

Mode gear

Reinforce bracket

A

Fig.1

Joint a

Reinforce bracket

Removing the head board (See Fig.4)

1.

Remove the screw B on the upper side. Unsolder
the wires on the under side of the head board, if
necessary.

REFERENCE:

Cassette guide

When reassembling, twist the wires by
turning the head board twice remarked c
and pass through the notch d as shown
in Fig.4.

Head board

B

Fig.2

Head board

Soldering

notch d

1-6

Tab b

Tab b

c

Fig.4Fig.3

KS-LH6R

y

Removing the load arm (See Fig.5)

1.

Remove the E-washer attaching the load arm.

2.

Move the load arm in the direction of the arrow and
release the joint e on the cassette catch.

Removing the cassette hanger assembly /
cassette holder (See Fig.6 to 9)

1.

Check the mode is set to EJECT. Push down the
front part of the cassette holder and move in the
direction of the arrow to release the joint f.

2.

Move the rear part of the cassette hanger assembly
in the direction of the arrow to release it from the two
joint bosses g.

Load arm

E-washer

Cassette holder assembly

Side bracket

Joints f

Joint e

Fig.5

Boss g

Cassette hanger
assembly

Boss g

3.

Release the holder stabilizer spring from the hooks h
and i, then pull out from the cassette hanger
assembly.

4.

Bring up the rear side of the cassette hanger
assembly to release the joint j and k.

5.

Pull out the cassette catch from the cassette hanger
assembly.

Cassette holder
assembly

Cassette holder assembly

Fig.6

Cassette hanger assembl

Cassette stabilizer spring

Hook i

Hook h

Fig.7

Cassette hanger assembly

Cassette catch

Cassette holder assembly

Hook j

Fig.8

Cassette hanger assembly

Hook k

Fig.9

1-7

KS-LH6R

Removing the side bracket assembly

(See Fig.10 to 12)

1.

Remove the screw C attaching the side bracket
assembly.

2.

Detach the front side of the side bracket assembly
upward and pull out forward to release the joint l and
m in the rear.

CAUTION:

CAUTION:

When reassembling, make sure that the
boss n of the main chassis is set in the
notch of the load rack under the side
bracket assembly. Do not reattach the
load rack on the boss n.

After reattaching the side bracket
assembly, confirm operation.

Side bracket assembly

Joint l

Joint m

C

Side bracket assembly

Fig.10

Side bracket assembly

Joint l

Joint m

Load rack

Load rack

Boss n

Boss n

Fig.11

1-8

Fig.12

Removing the pinch arm (F) assembly

(See Fig.13 and 14)

1.

Remove the polywasher and pull out the pinch arm
(F) assembly.

2.

Remove the compulsion spring.

Removing the pinch arm (R) assembly

(See Fig.13 and 15)

1.

Remove the polywasher and pull out the pinch arm
(R) assembly.

Removing the slide chassis assembly

(See Fig.16 and 17)

Polywasher

Polywasher

Compulsion spring

Pinch arm
(R) assembly

Fig.13

Pinch arm
(F) assembly

Pinch arm (F) assembly

Polywasher

KS-LH6R

REFERENCE:

It is not necessary to remove the head
and the tape guide.

1.

Move the slide chassis assembly in the direction of
the arrow to release the two joints o and remove
from the main chassis.

2.

Remove the rack link.

CAUTION:

When reassembling, first reattach the rack
link, and next fit the boss p and hook q of
the slide chassis assembly to the hole of the
main chassis, and engage the two joints o.

Rack link

Fig.14

Boss p

Pinch arm
(R) assembly

Fig.15

Head

Hook q

Polywasher

Tape guide

Joint o

Slide chassis assembly

Fig.16

Joint o

Fig.17

1-9

KS-LH6R

Removing the head / tape guide

(See Fig.18 and 19)

REFERENCE:

1.

Remove the band attaching the wire to the head.

2.

Remove the two screws D, the head and the head
support spring.

3.

Remove the pinch arm spring from the tape guide.

4.

Remove the tape guide and the pinch spring arm.

CAUTION:

CAUTION:

It is not necessary to remove the slide
chassis assembly.

When reattaching the pinch arm spring, set
both end of it to the pinch spring arm (
remarked r).

When reattaching the head, set the wires
into the groove of the tape guide (Fig.18).

D

Slide chassis assembly

Head

Tape guide

Fig.18

D

Pinch arm spring

Head

Head support spring

Tape guide

Removing the flywheel assembly (F) & (R)

(See Fig.20 and 21)

REFERENCE:

1.

Remove the belt at the bottom.

2.

Remove the two polywashers on the upper side.

3.

Pull out each flywheel assembly downward.

Flywheel assembly (F)

It is not necessary to remove the slide
chassis assembly.

Belt

r

Pinch spring arm

r

Slid chassis assembly

Fig.19

Polywasher

Polywasher

Flywheel assembly (R)

1-10

Fig.20

Flywheel assembly (F)

Fig.21

Flywheel assembly (R)