JVC KS-FX621 Service Manual
49825200303
KS-FX621
SERVICE MANUAL
CASSETTE RECEIVER
KS-FX621
11
RPT
1097
12
8
MO
RND
S
C
M
MODE
Area Suffix
U ------ Other Areas
TABLE OF CONTENTS
1 Safety precaution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.49825
2003/03
KS-FX621
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.
1-2 (No.49825)
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 si de, 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 main board.
Front panel assembly
Joint a
Fig.1
Bottom cover
KS-FX621
Release button
Joint
b
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 Joint e
Front chassis
Fig.3
Joint b
(No.49825)1-3
KS-FX621
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 scre ws 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, three screws E and three
screws F attaching the rear panel on the back of the body.
CB C
Heat sink
Fig.4
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 connectors CP701 on the main board from
the cassette mechanism assembly.
E
G
D
Rear panel
EFF
D
Fig.5
Main board assembly
G
1-4 (No.49825)
CP701
Fig.6
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.
2.1.8 Removing the mecha bo ar d
(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 J attaching the mecha board.
KS-FX621
Cassette mechanism assembly
H
H
H H
Top chassis
Fig.7
CN402
J
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 L attaching 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)
K
K
K K
Fig.9
CN401
Front panel assembly
Joint h
LCD & Key control board
Fig.8
Joint h
Joint h
Fig.10
CN403
Joint h
Rear cover
Fig.11
(No.49825)1-5
KS-FX621
r
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).
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 casse tte guide from the main chassis while re-
leasing each two joint tabs a in the direction of the arrow.
Mode gea
Fig.1
Cassette guide
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 b on the cassette catch.
Load arm
E-washer
Tab a
Tab a
Fig.2
Joint b
Fig.3
1-6 (No.49825)
2.2.3 Removing the cassette hanger assembly / cassette holder
y
(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 directi on of the arrow 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 e and
f, then pull out from the cassette hanger assembly.
(4) Bring up the rear side of the cassette hanger assembly to
release the joint g and h.
(5) Pull out the cassette catch from the cassette hanger as-
sembly.
Cassette holder assembly
KS-FX621
Cassette hanger assembly
Cassette stabilizer spring
Hook f
Hook e
Fig.5
Side bracket
Joints c
Cassette holder assembly
Fig.4
Boss d
Cassette hanger
assembly
Boss d
assette holder
ssembly
Cassette hanger assembl
Hook g
Hook h
Fig.6
Cassette hanger assembly
Cassette catch
Cassette holder assembly
Fig.7
(No.49825)1-7
KS-FX621
2.2.4 Removing the side bracket assembly
(See Fig.8 to 10)
(1) Remove the screw A attaching the side bracket assembly.
(2) Detach the front side of the side bracket assembly upward
and pull out forward to release the joint i and j in the rear.
CAUTION:
When reassembling, make sure that the boss k 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 k.
CAUTION:
After reattaching the side bracket assembly, confirm operation.
Side bracket assembly
Joint i
Side bracket assembly
Joint i
Joint j
Load rack
A
Joint j
Boss k
Fig.9
Side bracket assembly
Fig.8
Boss k
Load rack
1-8 (No.49825)
Fig.10
2.2.5 Removing the pinch arm (F) assembly
r
r
(See Fig.11 and 12)
(1) Remove the polywasher and pull out the pinch arm (F) as-
sembly.
(2) Remove the compulsion spring.
KS-FX621
Pinch arm (F) assembly
Polywasher
Compulsion spring
Polywasher
Pinch arm
(R) assembly
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.
Pinch arm
(R) assembly
Pinch arm
(F) assembly
Fig.11
Polywashe
Polywashe
Fig.12
Joint l
Joint l
Slide chassis
assembly
Fig.14
Fig.13
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 l and remove from the main
chassis.
(2) Remove the rack link.
CAUTION:
When reassembling, first reattach the rack link, and next fit the
boss m and hook n of the slide chassis assembly to the hole
of the main chassis, and engage the two joints l.
Head
Tape guide
Boss m
Rack link
Hook
n
Fig.15
(No.49825)1-9
KS-FX621
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).
Slide chassis assembly
B
Pinch arm spring
Head
Head support spring
Tape guide
o
B
Pinch spring arm
o
Head
Fig.16
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.
Flywheel assembly (F)
Tape guide
Belt
Slid chassis assembly
Fig.17
Polywasher
Polywasher
Flywheel assembly (F)
Flywheel assembly (R)
1-10 (No.49825)
Flywheel assembly (R)
Fig.19
Fig.18
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