JVC KS-FX621 Bedienungsanleitung
SERVICE MANUAL
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD. No.49825
2003/03
KS-FX621
CASSETTE RECEIVER
49825200303 KS-FX621
TABLE OF CONTENTS
1 Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
MO
D
ES
C
M
11
R
PT
12
RND
1097 8
MO
Area Suffix
U ------ Other Areas
KS-FX621
1-2 (No.49825)
SECTION 1
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.
KS-FX621
(No.49825)1-3
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.
Fig.1
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 ascrewdriver under the joints to release the two
joints aon the left side, the two joints bon the right side and
the joint con the back of the body, then remove the bottom
cover from the body.
CAUTION:
When releasing the joint cusing a screwdriver, do not damage
the main board.
Fig.2
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 Aon each side of the body.
(2) Release the two joints dand the two joints eon the sides,
then remove the front chassis toward the front.
Fig.3
Front panel assembly
Release button
Bottom cover
Joint b
Joint b
Joint a
Joint c
Joint a
Joint dJoint e
Front chassis
Joint d
A
Joint e
KS-FX621
1-4 (No.49825)
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 Band two screws Cattaching the
heat sink on the left side of the body, and remove the heat
sink.
Fig.4
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, three screws Eand three
screws Fattaching the rear panel on the back of the body.
Fig.5
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 Gattaching the main board on the
top chassis.
(2) Disconnect the connectors CP701 on the main board from
the cassette mechanism assembly.
Fig.6
Heat sink
CB C
ED
EFF
DRear panel
G
Main board assembly
CP701
G
KS-FX621
(No.49825)1-5
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 Hattaching the cassette mecha-
nism assembly from the top chassis.
Fig.7
2.1.8 Removing the mecha 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 the connectors CN402 and
CN403 on the mecha board.
(2) Remove the screw Jattaching the mecha board.
Fig.8
2.1.9 Removing the front board
(See Figs.9 to 11)
• Prior to performing the following procedure, remove the front
panel assembly.
(1) Remove the four screws Lattaching the rear cover on the
back of the front panel assembly. (See fig.9)
(2) Release the eleven joints f, the front panel and the rear
cover become separate. (See fig.10)
(3) Remove the front board from the front panel assembly.
(See fig.11)
Fig.9
Fig.10
Fig.11
HH
H H
Top chassis
Cassette mechanism assembly
J
CN402
CN401 CN403
K
K K
K
Joint h
Joint h
Joint h
Joint h
Front panel assembly
Rear cover
LCD & Key control board
KS-FX621
1-6 (No.49825)
2.2 CD Mechanism Assembly
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).
Fig.1
2.2.1 Removing the cassette guide
(See Fig.2)
(1) Turn the mode gear to set to RVS play or subsequent
mode.
(2) Remove the cassette guide from the main chassis while re-
leasing each two joint tabs ain the direction of the arrow.
Fig.2
2.2.2 Removing the load arm
(See Fig.3)
(1) Remove the E-washer attaching the load arm.
(2) Move the load arm in the direction of the arrow and release
the joint bon the cassette catch.
Fig.3
Mode gea
r
Cassette guide
Tab a
Tab a
Load arm
E-washer
Joint b
KS-FX621
(No.49825)1-7
2.2.3 Removing the cassette hanger assembly / cassette holder
(See Fig.4 to 7)
(1) Check the mode is set to EJECT. Push down the front part
of the cassette holder and move in the direction of the ar-
row to release the joint c.
(2) Move the rear part of the cassette hanger assembly in the
direction of the arrow to release it from the two joint bosses
d.
(3) Release the holder stabilizer spring from the hooks eand
f, then pull out from the cassette hanger assembly.
(4) Bring up the rear side of the cassette hanger assembly to
release the joint gand h.
(5) Pull out the cassette catch from the cassette hanger as-
sembly.
Fig.4
Fig.5
Fig.6
Fig.7
Cassette holder assembly
Side bracket
Joints c
Cassette holder assembly
Cassette hanger
assembly
Boss d
Boss d
Cassette hanger assembly
Cassette stabilizer spring
Hook f
Hook e
Cassette hanger assembl
y
Hook h
Hook g
C
assette holder
a
ssembly
Cassette holder assembly
Cassette hanger assembly
Cassette catch
KS-FX621
1-8 (No.49825)
2.2.4 Removing the side bracket assembly
(See Fig.8 to 10)
(1) Remove the screw Aattaching the side bracket assembly.
(2) Detach the front side of the side bracket assembly upward
and pull out forward to release the joint iand jin the rear.
CAUTION:
When reassembling, make sure that the boss kof 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 k.
CAUTION:
After reattaching the side bracket assembly, confirm opera-
tion.
Fig.8
Fig.9
Fig.10
A
Side bracket assembly
Side bracket assembly Joint i
Joint j
Joint i
Joint j
Side bracket assembly
Boss k
Load rack
Boss k
Load rack
KS-FX621
(No.49825)1-9
2.2.5 Removing the pinch arm (F) assembly
(See Fig.11 and 12)
(1) Remove the polywasher and pull out the pinch arm (F) as-
sembly.
(2) Remove the compulsion spring.
Fig.11
Fig.12
2.2.6 Removing the pinch arm (R) assembly
(See Fig.11 and 13)
(1) Remove the polywasher and pull out the pinch arm (R) as-
sembly.
Fig.13
Fig.14
2.2.7 Removing the slide chassis assembly
(See Fig.14 and 15)
REFERENCE:
It is not necessary to remove the head and the tape guide.
(1) Move the slide chassis assembly in the direction of the ar-
row to release the two joints land remove from the main
chassis.
(2) Remove the rack link.
CAUTION:
When reassembling, first reattach the rack link, and next fit the
boss mand hook nof the slide chassis assembly to the hole
of the main chassis, and engage the two joints l.
Fig.15
Polywashe
r
Polywasher Pinch arm
(F) assembly
Pinch arm
(R) assembly
Polywasher Pinch arm (F) assembly
Compulsion spring
Pinch arm
(R) assembly Polywashe
r
Slide chassis
assembly
Joint l
Joint l
Boss m
Hook
n
Rack link
Head
Tape guide
KS-FX621
1-10 (No.49825)
2.2.8 Removing the head / tape guide
(See Fig.16 and 17)
REFERENCE:
It is not necessary to remove the slide chassis assembly.
(1) Remove the band attaching the wire to the head.
(2) Remove the two screws B, 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:
When reattaching the pinch arm spring, set both end of it to the
pinch spring arm ( remarked o).
CAUTION:
When reattaching the head, set the wires into the groove of the
tape guide (Fig.16).
Fig.16
Fig.17
2.2.9 Removing the flywheel assembly (F) & (R)
(See Fig.18 and 19)
REFERENCE:
It is not necessary to remove the slide chassis assembly.
(1) Remove the belt at the bottom.
(2) Remove the two polywashers on the upper side.
(3) Pull out each flywheel assembly downward.
Fig.18
Fig.19
B
Slide chassis assembly
Head Tape guide
BPinch arm spring
Head
Head support spring
Tape guide
Pinch spring arm
Slid chassis assembly
o
o
Flywheel assembly (F)
Flywheel assembly (R)
Belt
Polywasher
Polywasher
Flywheel assembly (F)
Flywheel assembly (R)
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2
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