JVC KS-FX725R Service Manual
SERVICE MANUAL
TP
RDS
PTY
DISP
CASSETTE RECEIVER
KS-FX725R
KS-FX725R
Contents
DISP
TP
RDS
PTY
8 9 10 11 127
Safety precaution
Disassembly method
Adjustment method
Description of major ICs
DAB
MO
Area Suffix
EE ---- Russian Federation
1-2
1-3
1-18
1-22
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
No.49721
Mar. 2002
KS-FX725R
Safety precaution
!
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
<Main body>
Removing the front panel assembly
(See Fig.1)
1.
Press the eject button in the lower right part of the
front panel. Remove the front panel assembly from
the body.
Removing the front chassis assembly
(See Fig.2 , 3)
Front panel assembly
Joint
KS-FX725R
Eject button
Fig.1
a
Prior to performing the following procedure, remove
the front panel assembly.
1.
Release the four joints a on both sides of the front
chassis assembly and remove the front chassis
assembly toward the front.
Joint
Front chassis assembly
Heat sink
a
Fig.2
Joint
Joint
a
a
Front chassis
assembly
Fig.3
1-3
KS-FX725R
Removing the heat sink (See Fig.4)
1.
Remove the three screws A on the left side of the
body.
Removing the bottom cover
(See Fig.5 , 6)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly
and the heat sink.
1.
Turn over the body and unjoint the five joints b with
the bottom cover and the body using a screwdriver.
CAUTION:
When disengaging the joint c using a
screwdriver, do not damage or break the
board.
AA
Heat sink
Fig.4
Joint b
Bottom cover
Joint c
Joint b
Rear panel
Fig.5
Joint b
Bottom cover
Joint b
Joint c
Rear panel
Fig.6
1-4
KS-FX725R
Removing the main board
(See Fig.7 , 8)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink and the bottom cover.
1.
Remove the screw B, the three screws C and the
two screws D attaching the rear bracket on the back
of the body. Remove the rear panel.
2.
Remove the two screws E attaching the main board
on the bottom of the body. Disconnect connector
CP401 on the main board in the direction of the
arrow.
D
E
Rear panel
Fig.7
Main board
C
B
C
D
E
Removing the cassette mechanism section
(See Fig.9)
Prior to performing the following procedure, remove
the front panel assembly, the front chassis assembly,
the heat sink, the bottom cover and the main board.
1.
Remove the four screws F attaching the cassette
mechanism section on the back of the top chassis.
Fig.8
CP401
Cassette mechanism section
FF
FF
Fig.9
Top chassis
1-5
KS-FX725R
Removing the control switch board
(See Fig.10 ~ 12)
Prior to performing the following procedure, remove
the front panel assembly.
1.
Remove the four screws G attaching the rear cover
on the back of the front panel assembly.
2.
Unjoint the ten joints d with the front panel and the
rear cover.
3.
Remove the control switch board on the back of the
front panel.
G G
G
Rear cover
Fig.10
G
Front panel
Joint d
Rear cover
Front panel
Joint d
Joint d
Joint d
Fig.11
1-6
Control switch board
Fig.12
KS-FX725R
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).
Removing the reinforce bracket
(See Fig.1 and 2)
1.
Remove the screw A attaching the reinforce bracket
on the bottom of the body.
2.
To release joint a, turn and detach the reinforce
bracket from the side bracket assembly as shown in
Fig.2
Removing the cassette guide (See Fig.3)
1.
Turn the mode gear to set to RVS play or
subsequent mode.
2.
Remove the cassette guide from the main chassis
while releasing each two joint tabs b in the direction
of the arrow.
Mode gear
Reinforce bracket
A
Fig.1
Joint a
Reinforce bracket
Removing the head board (See Fig.4)
1.
Remove the screw B on the upper side. Unsolder
the wires on the under side of the head board, if
necessary.
REFERENCE:
Cassette guide
When reassembling, twist the wires by
turning the head board twice remarked c
and pass through the notch d as shown
in Fig.4.
Head board
B
Fig.2
Head board
Soldering
notch d
Tab b
Tab b
c
Fig.4Fig.3
1-7
KS-FX725R
Removing the load arm (See Fig.5)
1.
Remove the E-washer attaching the load arm.
2.
Move the load arm in the direction of the arrow and
release the joint e on the cassette catch.
Removing the cassette hanger assembly /
cassette holder (See Fig.6 to 9)
1.
Check the mode is set to EJECT. Push down the
front part of the cassette holder and move in the
direction of the arrow to release the joint f.
2.
Move the rear part of the cassette hanger assembly
in the direction of the arrow to release it from the two
joint bosses g.
Load arm
E-washer
Cassette holder assembly
Side bracket
Joints f
Joint e
Fig.5
Boss g
Cassette hanger
assembly
Boss g
3.
Release the holder stabilizer spring from the hooks h
and i, then pull out from the cassette hanger
assembly.
4.
Bring up the rear side of the cassette hanger
assembly to release the joint j and k.
5.
Pull out the cassette catch from the cassette hanger
assembly.
Cassette holder
assembly
Cassette holder assembly
Fig.6
Cassette hanger assembly
Cassette stabilizer spring
Hook i
Hook h
Fig.7
Cassette hanger assembly
Cassette catch
Cassette holder assembly
1-8
Hook j
Fig.8
Cassette hanger assembly
Hook k
Fig.9
KS-FX725R
Removing the side bracket assembly
(See Fig.10 to 12)
1.
Remove the screw C attaching the side bracket
assembly.
2.
Detach the front side of the side bracket assembly
upward and pull out forward to release the joint l and
m in the rear.
CAUTION:
CAUTION:
When reassembling, make sure that the
boss n 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 n.
After reattaching the side bracket
assembly, confirm operation.
Side bracket assembly
Joint l
Joint m
C
Side bracket assembly
Fig.10
Side bracket assembly
Joint l
Joint m
Load rack
Load rack
Boss n
Boss n
Fig.11
Fig.12
1-9
KS-FX725R
Removing the pinch arm (F) assembly
(See Fig.13 and 14)
1.
Remove the polywasher and pull out the pinch arm
(F) assembly.
2.
Remove the compulsion spring.
Removing the pinch arm (R) assembly
(See Fig.13 and 15)
1.
Remove the polywasher and pull out the pinch arm
(R) assembly.
Removing the slide chassis assembly
(See Fig.16 and 17)
Polywasher
Pinch arm
(R) assembly
Polywasher
Compulsion spring
Fig.13
Pinch arm
(F) assembly
Pinch arm (F) assembly
Polywasher
REFERENCE:
It is not necessary to remove the head
and the tape guide.
1.
Move the slide chassis assembly in the direction of
the arrow to release the two joints o and remove
from the main chassis.
2.
Remove the rack link.
CAUTION:
When reassembling, first reattach the rack
link, and next fit the boss p and hook q of
the slide chassis assembly to the hole of the
main chassis, and engage the two joints o.
Rack link
Fig.14
Boss p
Pinch arm
(R) assembly
Fig.15
Head
Hook q
Polywasher
Tape guide
Joint o
Slide chassis assembly
1-10
Fig.16
Joint o
Fig.17
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