JVC KS-FX8 Service Manual
KS-FX8
SERVICE MANUAL
CASSETTE RECEIVER
4982620034
KS-FX8
Area Suffix
UN ----------- Asean
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-15
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.49826
2003/4
KS-FX8
1.1 Safety Precautions
SECTION 1
Important 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.
1-2 (No.49826)
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 assembly and remove the front panel assembly in
the direction of the arrow.
2.1.2 Removing the bottom cover
(See Fig.2)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) Turn the main body upside down.
(2) Insert a screwdriver under the joints to release the two
joints a on the left side, two joints b on the right side and
joint c on the back side of the main body, then remove the
bottom cover from the main body.
CAUTION:
When releasing the joints using a screwdriver, do not damage
the main board.
KS-FX8
Front panel assembly
Detach button
Fig.1
Bottom cover
Joint b
Joint a
Joint a
Joint b
Joint c
Fig.2
(No.49826)1-3
KS-FX8
2.1.3 emoving the front chassis assembly
(See Figs.3 and 4)
• Prior to performing the following procedures, remove the front
panel assembly and bottom cover.
(1) Remove the two screws A on the both sides of the main
body. (See Fig.3.)
(2) Remove the two screws B on the front side of the main
body. (See Fig.4.)
(3) Release the two joints d and two joints e on the both sides
of the main body, then remove the front chassis assembly
toward the front. (See Fig.3.)
Joint d
A
Joint e
A
2.1.4 Removing the heat sink
(See Fig.5)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws C and two screws D attaching the
heat sink on the left side of the main body, and remove the
heat sink.
Joint d
Front chassis assembly
B
Joint e
Fig.3
Front chassis assembly
Fig.4
C
2.1.5 Removing the rear panel
(See Fig.6)
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the two screws E, screws F and five screws G at-
taching the rear panel on the back side of the main body.
1-4 (No.49826)
D
Heat sink
Fig.5
GG
EE
Rear bracket
F
Fig.6
2.1.6 Removing the main board
(See Fig.7)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis assembly, heat
sink and rear panel.
(1) Remove the two screws H attaching the main board on the
top chassis.
(2) Disconnect the connector CP701 on the main board from
the cassette mechanism assembly.
2.1.7 Removing the cassette mechanism assembly
(See Fig.8)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis assembly, heat
sink, rear panel and main board.
(1) Disconnect the card wire from the connector CN403 on the
mecha board.
(2) Remove the four screws J attaching the cassette mecha-
nism assembly from the top chassis, take out the cassette
mechanism assembly.
(3) From the bottom side of the cassette mechanism assem-
bly, disconnect the wire from the connector on the head
board.
KS-FX8
Main board
H
CP701
Fig.7
Cassette mechanism assembly
J
H
J
Connector
Head board
2.1.8 Removing the mecha board
(See Fig.9)
• Prior to performing the following procedures, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Remove the screw K attaching the mecha board.
(2) Bend the hook f in the direction of the arrow 1 and move the
mecha board in the direction of the arrow 2.
(3) Remove the mecha board from the mecha bracket (L) of
the top chassis.
Mecha board
Top chassis
K
J J
CN403
Fig.8
Mecha board
Fig.9
Top chassis
Hook e
1
2
Mecha bracket (L)
(No.49826)1-5
KS-FX8
f
2.1.9 Removing the front board
(See Figs.10 to 12)
• Prior to performing the following procedures, remove the front
panel assembly.
(1) Remove the four screws L attaching the rear cover on the
back side of the front panel assembly. (See Fig.10.)
(2) Release the nine joints g, the front panel assembly and the
rear cover become separate. (See Fig.11.)
(3) Remove the front board from the front panel assembly.
(See Fig.12.)
Rear cover
Joint f
L
Joints f
L
L
Fig.10
Front panel assembly
Joint
Rear cover
Front board
Joints f
Fig.11
Front panel assembly
Fig.12
1-6 (No.49826)
2.2 Cassette mechanism assembly
• Prior to performing the following procedures, remove the head
amplifier board, the relay board and the mechanism bracket.
2.2.1 Removing the direction switch board
(See Fig.1)
(1) Unsolder the three wires a on the direction switch board.
(2) Remove the one screw A attaching the direction switch
board.
2.2.2 Removing the FF / REW lever assembly
(See Fig.1)
(1) Remove the screw B attaching the FF / REW lever assem-
bly on the back of the cassette mechanism assembly.
(2) Remove the screw C on the upper side of the FF / REW le-
ver assembly.
(3) Lift and pull forward the FF / REW lever assembly to disen-
gage the joints b, c, d and e.
2.2.3 Reattaching the FF / REW lever assembly
(See Fig.1)
(1) Reattach the FF / REW lever assembly to the joint c on the
back of the chassis.
(2) Reattach the pinch-roller shaft e, the change lever d and
the return link e to the chassis.
C
FF / REW lever assembly
Joint c
KS-FX8
2.2.4 Removing the playback head
(See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly.
(1) Remove the screw D attaching the playback head.
(2) Remove the C washer and pull out the FF roller.
(3) Remove the S support plate, the A arm spring (a) and (b),
the playback head.
ATTENTION:
The A arm spring (a) differs from the A arm spring (b).
2.2.5 Removing the pinch-roller (R) and (F) assembly
(See Fig.2)
• Prior to performing the following procedure, remove the direc-
tion switch board and the FF / REW lever assembly.
(1) Remove the P arm spring (f) in the pinch-roller (F) assem-
bly from the chassis.
(2) Remove the P arm spring (r) in the pinch-roller (R) assem-
bly from the chassis.
(3) Draw out the pinch roller (F) and (R) assembly from the
shaft.
ATTENTION:
The P arm spring (f) differs from the P arm spring (r).
ATTENTION:
The pinch roller (F) assembly differs from the pinch roller (R)
assembly.
Joint e
Joint d
A
Soldering a
Direction switch board
Fig.1
Pinch-roller (R) assembly
Shaft
Remove the P arm spring (r)
from the chassis.
Joint b
B
C washer
A arm spring (b)
FF roller
S support plate
D
Playback head
Pinch-roller (F) assembly
A arm spring (a)
Shaft
Remove the P arm spring (f)
from the chassis.
P arm spring (r)
P arm spring (f)
Fig.2
(No.49826)1-7
KS-FX8
2.2.6 Removing the cassette hanger / cassette holder
(See Fig.3)
• Prior to performing the following procedure, remove the FF /
REW lever assembly.
(1) From the rear of the unit, bend the two tabs f outwards and
disengage the two joints g in the direction of the arrow.
(2) Push the eject lever and remove the cassette holder from
the playback head. Disengage the two joints h of the cassette hanger / cassette holder and the eject lever in the direction of the arrow.
(3) Lift the cassette hanger / cassette holder and disengage
the joint i of the return link and the eject lever.
2.2.7 Removing the reel disc assembly
(See Fig.4)
• Prior to performing the following procedure, remove the FF /
REW lever assembly and the cassette hanger / cassette holder.
(1) Remove the C washer and pull out reel disc assembly.
ATTENTION:
Replace with a new C washer when reattaching.
Joint g
Cassette holder
Cassette hanger
Chassis
Tab f
Tab f
C washer
Return link
Joint i
Eject lever
Joint h
Joint h
Joint g
Fig.3
2.2.8 Removing the motor assembly
(See Fig.5)
(1) Unsolder the two wires j on the motor assembly.
(2) Turn over the cassette mechanism assembly and remove
the main belt and the sub-belt from the motor pulley.
ATTENTION:
The main belt can now be removed.
(3) Remove the two screws G attaching the motor assembly.
C washer
Flywheel (BF)
Fig.4
Main-belt
E
Reel disc assembly
Motor assembly
Sub-belt
G
E
Motor pulley
G
Soldering j
1-8 (No.49826)
Flywheel (BR)
Reel base assembly
E
Fig.5
F
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