JVC KSFX-834-R Service manual
SERVICE MANUAL
CASSETTE RECEIVER
KS-FX834R
KS-FX834R
Contents
Safety precaution
Disassembly method
Adjustment method
Description of major ICs
This service manual is printed on 100% recycled paper.
COPYRIGHT 2000 VICTOR COMPANY OF JAPAN, LTD.
Area Suffix
E ---- Continental Europe
1-2
1-3
1-10
1-14
No.49571
Sep. 2000
KS-FX834R
Safety precaution
CAUTION
!
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-FX834R
Fig.1
c
Removing the front chassis
1.2.Remove the two screws A attaching the front
chassis.
Insert a screwdriver to the two joints a on the side
of the front chassis, two joints b on the right side
and one joint c from upside, then detach the front
chassis toward the front side.
(See Fig.2~3)
A
a
a
Front chassis
Fig.2
b
b
Removing the heat sink
1. Remove the three screws B attaching the heat sink
on the left side of the body, and remove the heat
sink.
(See Fig.4)
B
B
Fig. 3
B
Heat sink
Fig. 4
1-3
KS-FX834R
Removing the bottom cover
1.2.Turn the body upside down.
Insert a screwdriver to the two joints d and two
joints e on both sides of the body and the joint f on
the back of the body, then detach the bottom cover
from the body.
Removing the rear panel
1.
Remove the front chassis.
(See Fig.5)
(See Fig.6 )
Bottom cover
d
e
f
Fig. 5
C
2.
Remove the heat sink.
3.
Remove the bottom cover.
4.
Remove the five screws B attaching the rear panel
and one screw C attaching the pine jack on the
back of the body.
Removing the main amplifier board
assembly
1.
Remove the front chassis.
2.
Remove the bottom cover.
3.
Remove the rear panel.
4.
Remove the two screws D attaching the main
amplifier board assembly on the top cover.
5.
Disconnect connector CP701 on the main amplifier
board assembly from the cassette mechanism
assembly.
(See Fig.7)
B
D
B
B
Fig. 6
Main board assembly
D
CP701
Fig. 7
1-4
KS-FX834R
Removing the Cassette mechanism
assembly
1.
Remove the front chassis.
2.
Remove the bottom cover.
3.
Remove the main amplifier board assembly.
4.
Remove the fore screws F attaching the cassette
mechanism assembly from the top cover.
(See Fig.8)
Removing the control switch board
(See Fig.9 and 10 )
Cassette mechanism assembly
F
F
Fig. 8
G
F
Top cover
F
G
1.
Remove the front panel unit from the main body.
2.
Remove the five screws G attaching the rear cover
on the back of the front panel unit.
3.
Remove the control switch board from the front
panel unit.
G
Fig. 9
LCD & Key control board
Fig. 10
G
1-5
KS-FX834R
<Removal of the cassette mechanism>
Cassette mechanism ass’y
Removing the mecha control P.W.B.
(See Fig.1 and 2)
1.
For the 6pin harness extending from connector
CN402 on the mecha control P.W.B, disconnect it
from the head relay P.W.B.
2.
Disconnect the card wire from connector CN403 on
the mecha control P.W.B.
3.
Remove the screw A attaching the mecha control
P. W. B .
4.
Move the tab a as shown in Fig.2 and remove the
mecha control P.W.B. while moving it in the direction
of the arrow.
Removing the cassette mechanism
assembly (See Fig.1 to 3)
1.
Disconnect the 6pin harness from connector CN402
and the card wire from CN403 on the mecha control
P.W.B. (Refer to Fig.1 and 2).
Head relay
P.W.B.
6pin
harness
CN402
CN402
Mecha control
A
CN403
Fig.1
CN403
Fig.2
Mecha control
P.W.B.
P.W.B.
Tab a
2.
Remove the four screws B on the bottom of the
cassette mechanism.
Mecha control
B
P.W.B.
Cassette mechanism ass’y
B
Fig.3
1-6
KS-FX834R
Removing the head relay P.W.B.
(See Fig.4)
1.
Unsolder the soldering b on the head relay P.W.B.
2.
Remove the screw C attaching the head relay P.W.B.
3.
Remove the head relay P.W.B. in the direction of the
arrow while releasing the two joints c.
Removing the load arm (See Fig.5)
1.
Remove the E washer attaching the load arm using
a pincette or something like that and remove the
spring d.
2.
Move the part of the load arm marked upwards to
release it from the axis of rotation. Then rotate the
load arm in the direction of the arrow to remove it
from the cach.
Fig.4
Cach
Load arm
Fig.5
Head relay P.W.B.
Soldering b
C
E washer
Joint c
Spring d
Removing the sub chassis (See Fig.6)
*
Prior to performing the following procedure, remove
the head relay P.W.B.
1.
Remove the screw D attaching the sub chassis.
2.
Push the tab e in the direction of the arrow to detach
the one side of the sub chassis. Then release the
sub chassis from the tab f.
Removing the cassette holder and the
holder arm in the eject mode
(See Fig.7 and 8)
*
Prior to performing the following procedure, remove
the head relay P.W.B., the load arm and the sub
chassis.
1.
Remove the screw E attaching the reinforce bracket.
2.
Remove the reinforce bracket.
Tab f
Sub chassis
Head relay
P.W.B.
D
Cassette mecha chassis
Cassette holder
Fig.6
Head relay P.W.B.
Tab e
Reinforce bracket
E
Reinforce
bracket
tab g
3.
Push the tab g fixing the cassette holder in the
direction of the arrow and open the cassette holder
and the holder arm upward until they stop at an
angle of 45 degrees. Move the two joints h to the
side and remove the cassette holder and the holder
arm from the shaft.
Joint h
Load arm
Holder arm
Fig.7
Joint h
1-7
KS-FX834R
Removing the play head (See Fig.9)
*
Prior to performing the following procedure, remove
the head relay P.W.B.and the sub chassis.
1.
Remove the two screws F attaching the play head
(The spring under the play head comes off at the
same time).
Shaft
Joint h
Pinch roller ass’y
Fig.8
Play head
Cassette holder
and holder arm
Joint h
Shaft
Pinch roller ass’y
Removing the pinch roller ass’y
(See Fig.9)
*
Prior to performing the following procedure, remove
the head relay P.W.B. and the sub chassis.
1.
Push each tab i in the direction of the arrow and pull
out the pinch rollers on both sides.
Removing the reel disc P.W.B.
(See Fig.10)
1.
Unsolder the soldering j on the reel disc P.W.B.
2.
Push the seven tabs k on the bottom of the cassette
mechanism assembly in the direction of the arrow.
Removing the motor and the sub motor
(See Fig.10 and 11)
Tab i
Tab i
Soldering j
G
Motor
F
Pinch roller ass’y
Fig.9
Reel disc P.W.B.
Tabs k
Tabs k
G
Tab i
Spring
Tab i
Cassette mechanism ass’y
Flywheel
Belt
Fig.10
1.
Unsolder the two soldering l of the motor and the sub
motor.
2.
Release the sub motor from the three tabs m. Push
the sub motor upward and pull out it.
3.
Remove the belt on the bottom of the cassette
mechanism assembly and remove the two screws G
attaching the motor.
ATTENTION:
The motors can be detached before
removing the load arm.
1-8
Sub motor
Tab m
Load arm
Soldering j
Tab m
Soldering l
Tab m
Soldering l
Motor
Fig.11
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