Jvc KS-F171 Service Manual
49774200301
KS-F171
SERVICE MANUAL
CASSETTE RECEIVER
KS-F171
Area Suffix
U ------- Other Areas
S.BASS
SEL
D
ISP
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.49774
2003/01
KS-F171
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.49774)
SECTION 2
Disassembly method
2.1 Main body
2.1.1 Removing the front panel assembly
(See Fig.1)
(1) Press the release button and remove the front panel as-
sembly.
2.1.2 Removing the bottom cover
(See Fig.2)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Turn the body upside down.
(2) Insert a screwdriver under the joints to release the two
joints a on the left side, the two joints b on the right side and
the joint c on the back of the body, then remove the bottom
cover from the body.
CAUTION:
When releasing the joint c using a screwdriver, do not
damage the board.
KS-F171
Front panel assembly
Release button
Fig.1
Bottom cover
Joint b
Joint a
2.1.3 Removing the front chassis
(See Fig.3)
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the screw A on each side of the body.
(2) Release the two joints d and the two joints e on the sides,
then remove the front chassis toward the front.
Joint a
Joint c
Fig.2
Joint d Joint e
A
Joint d
Front chassis
Fig.3
Joint e
Joint b
(No.49774)1-3
KS-F171
2.1.4 Removing the heat sink
(See Fig.4)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the two screws B and two screws C attaching the
heat sink on the left side of the body, and remove the heat
sink.
2.1.5 Removing the rear panel
(See Fig.5 )
• Prior to performing the following procedure, remove the front
panel assembly and bottom cover.
(1) Remove the two screws D, one screw E and three screws
F attaching the rear panel on the back of the body.
CB C
Heat sink
Fig.4
D
FF
2.1.6 Removing the main board
(See Fig.6)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink and
rear panel.
(1) Remove the two screws G attaching the main board on the
top chassis.
(2) Disconnect the two connectors CN901 and CN721 on the
main board from the cassette mechanism assembly.
E
G
CN721
D
Fig.5
Main board
G
CN901
Fig.6
1-4 (No.49774)
2.1.7 Removing the cassette mechanism assembly
(See Fig.7)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel and main board.
(1) Remove the four screws H attaching the cassette mecha-
nism assembly from the top chassis.
H
KS-F171
Cassette mechanism assembly
H
2.1.8 Removing the head amplifier board
(See Fig.8)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Disconnect the wire from CJ901 on the head amplifier
board.
(2) Remove the one screw J attaching the head amplifier
board.
(3) Move the head amplifier board in the direction of the arrow
to release the two joints f, the head amplifier board can be
removed.
H
CJ901
joint f
To head relay board
H
Top chassis
Fig.7
Head amplifier board
joint f
J
Fig.8
(No.49774)1-5
KS-F171
2.1.9 Removing the relay board
(See Fig.9)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board and cassette mechanism assembly.
(1) Disconnect the wire from CP722 on the relay board.
(2) Remove the one screw K attaching the relay board.
(3) Move the relay board in the direction of the arrow to release
the joint g, the relay board can be removed.
Relay board
CP722
2.1.10 Removing the mecha bracket
(See Fig.10)
• Prior to performing the following procedure, remove the front
panel assembly, bottom cover, front chassis, heat sink, rear
panel, main board, cassette mechanism assembly, head amplifier board and relay board.
(1) Remove the four screws L attaching the mecha bracket.
joint g
Fig.9
Mecha bracket
K
L
L
L
L
Fig.10
1-6 (No.49774)
2.1.11 Removing the switch (LCD & key) board
(See Fig.11~13)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws M attaching the rear cover on the
back of the front panel assembly.
(2) Release the eleven joints h, the front panel and the rear
cover become separate.
(3) Remove the switch board from the rear cover.
M
M
M M
Fig.11
Joint h
KS-F171
Joint h
Joint h
Joint h
Fig.12
Switch (LCD & Key) board
Fig.13
(No.49774)1-7
KS-F171
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
lever 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
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.
1-8 (No.49774)
P arm spring (r)
P arm spring (f)
Fig.2
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