JVC KW-XC777 Service Manual
SERVICE MANUAL
CD/CASSETTE RECEIVER
KW-XC777
Contents
KW-XC777
E
X
Area Suffix
U Other Areas
Safety precaution
Preventing static electricity
Disassembly method
Adjustment method
Flow of functional operation
untill TOC read
Maintenance of laser pickup
Replacement of laser pickup
Description of major ICs
COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.
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1-30~47
No.49687
Feb. 2002
KW-XC777
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.
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
1-2
KW-XC777
Preventing static electricity
1.Grounding to prevent damage by static electricity
Electrostatic discharge (ESD), which occurs when static electricity stored in the body, fabric, etc. is discharged,
can destroy the laser diode in the traverse unit (optical pickup). Take care to prevent this when performing repairs.
2.About the earth processing for the destruction prevention by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as CD players.
Be careful to use proper grounding in the area where repairs are being performed.
2-1 Ground the workbench
Ground the workbench by laying conductive material (such as a conductive sheet) or an iron plate over
it before placing the traverse unit (optical pickup) on it.
2-2 Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
3. Handling the optical pickup
1. In order to maintain quality during transport and before installation, both sides of the laser diode on the
replacement optical pickup are shorted. After replacement, return the shorted parts to their original condition.
(Refer to the text.)
2. Do not use a tester to check the condition of the laser diode in the optical pickup. The tester's internal power
source can easily destroy the laser diode.
4.Handling the traverse unit (optical pickup)
1. Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.
2. Cut off the shorted part of the flexible cable using nippers, etc. after replacing the optical pickup. For specific
details, refer to the replacement procedure in the text. Remove the anti-static pin when replacing the traverse
unit. Be careful not to take too long a time when attaching it to the connector.
3. Handle the flexible cable carefully as it may break when subjected to strong force.
4. It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it
CD mechanism ass’y
Damper bracket
Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
1.Solder is put up before the card wire is removed from connector on
the CD substrate as shown in Figure.
(When the wire is removed without putting up solder, the CD pick-up
assembly might destroy.)
2.Please remove solder after connecting the card wire with
when you install picking up in the substrate.
Front bracket
Feed motor ass’y
FD screw
CD mechanism
control board
Soldering
FD gear
Pickup unit
1-3
KW-XC777
Disassembly method
Removing the front panel assembly
(See Fig.1 to 3)
1.
Remove the four screws A on both sides of the
body.
2.
Release four joints a on both sides of the body using
a screwdriver and remove the front panel assembly
toward the front. The connector which connects the
front panel assembly with the rear section comes off.
CAUTION:
When reassembling, make sure that
connector CN501 on the front panel
assembly is securely connected to
CN701 on the main board (See Fig.3).
Joint a
A
A
Joint a
Front panel assembly
Fig.1
Joint a
A
CN501
A
Joint a
Front panel assembly
Fig.2
1-4
CN701
Front panel assembly
Fig.3
Removing the system control board /
switch board (See Fig.4 to 5)
Prior to performing the following procedure, remove
the front panel assembly.
1.
Remove the twelve screws B retaining the system
control board.
2.
Remove the five screws C retaining the switch
board.
3.
Unsolder WR501 and WR502 of the wires
connecting the system control board with the switch
board.
B
B
WR502
System control board
WR502
B
Switch board
Fig.4
KW-XC777
B
B
WR501
WR502
System control board
CC
Switch board
Fig.5
WR501
1-5
KW-XC777
Removing the CD player section /
cassette player section (See Fig.6 to 10)
Prior to performing the following procedure, remove
the front panel assembly.
1.
Remove the ten screws D, the screw E and F
attaching the rear panel on the back of the body.
2.
Remove the three screws G and the two screws H
attaching the heat sink on the left side.
3.
Remove the three screws I attaching the CD player
section and the cassette player section on the both
sides of the body.
4.
Disconnect the card wire from connector CN702 on
the main board in the CD player section on the back
of the body.
5.
Remove the CD player section upward.
CAUTION:
When reassembling, joint the CD player
section and the cassette player section
at four joints b.
D
G
Rear panel
Heat sink
H
E
Fig.6
Fig.7
D
F
D
G
I
CD player section
CN702
I
CD player section
I
Fig.8
Joint b
Joint b
1-6
Joints b
Cassette player section
Cassette player section
Fig.10Fig.9
<CD player section>
KW-XC777
Prior to performing the following procedure, remove
the front panel assembly, the CD player section and
the cassette player section.
Removing the main board (See Fig.11)
1.
Remove the three screws J attaching the main
board. The connector CN601 on the main board is
disconnected from the CD mechanism control board.
CAUTION:
When reassembling, securely connect
connector CN601 on the main board to
the connector on the CD mechanism
control board.
Main board
J
J
Fig.11
CN601
J
K
Removing the CD mechanism assembly
(See Fig.12)
Prior to performing the following procedure, remove
the main board.
1.
Remove the three screws K attaching the CD
mechanism assembly.
K
K
CD mechanism assembly
Fig.12
1-7
KW-XC777
<Cassette player section>
Prior to performing the following procedures, remove
the front panel assembly, the CD player section and
the cassette player section.
Removing the main board (See Fig.13)
1.
Disconnect the card wire from connector CN972 on
the main board.
2.
Remove the two screws L attaching the main board.
Removing the cassette mechanism
assembly (See Fig.13 and 14)
L
M
CN972
Cassette mechanism assembly
Fig.13
Bottom cover
Main board
L
M
Prior to performing the following procedure, remove
the main board.
1.
Disconnect the card wire from connector CN972 on
the main board.
2.
Remove the four screws M from the bottom cover of
the cassette player section.
Removing the connector board
(See Fig.15)
Prior to performing the following procedure,
remove the cassette mechanism assembly.
1.
Remove the screw N and move the connector
board in the direction of the arrow to release the
two joints c.
2.
Disconnect the wire from connector CJ402 and
the card wire from CN403 on the connector
board respectively.
CJ402
Fig.14
N
Connector board
Joints c
CN403
1-8
Fig.15
KW-XC777
<CD mechanism section>
Removing the CD mechanism control
board (See Fig.1 and 2)
1.
Unsolder the part a and b on the CD mechanism
control board.
2.
Remove the stator fixing the CD mechanism control
board and the damper bracket (To remove the stator
smoothly, pick up the center part).
3.
Remove the screw A attaching the CD mechanism
control board.
4.
Remove the CD mechanism control board in the
direction of the arrow while releasing it from the two
damper bracket slots d and the front bracket slot e.
5.
Disconnect the flexible wire from connector on the
pickup unit.
ATTENTION:
Turn the FD gear in the direction of the
arrow to move the entire pickup unit to
the appropriate position where the
flexible wire of the CD mechanism unit
can be disconnected easily.
(Refer to Fig.2)
CD mechanism assembly
D
h
Front bracket
Pickup unit
Damper bracket
D
A
Fig.1
e
b
Flexible wire
a
h
c
D
d
CD mechanism
control board
Shift the lock
Removing the loading motor
(See Fig.3 to 5)
Prior to performing the following procedure, remove
the CD mechanism control board.
1.
Remove the two springs f attaching the CD
mechanism assembly and the front bracket.
2.
Remove the two screws B and the front bracket
while pulling the flame outward.
3.
Remove the belt and the screw C from the loading
motor.
Loading motor
C
f
B
Loading motor
Pull outward
FD gear
Fig.2
CD mechanism control board
f
B
Front bracket
Fig.3
Front bracket
Pull outward
Fig.5
Belt
Flame
Fig.4
1-9
KW-XC777
Removing the CD mechanism assembly
(See Fig.1, 6 to 9)
Prior to performing the following procedure, remove
the CD mechanism control board and the front
bracket (loading motor).
1.
Remove the three screws D and the damper
bracket.
2.
Raise the both sides fix arms and move the fix plates
in the direction of the arrow to place the four shafts g
as shown in Fig.8 and 9.
3.
Remove the CD mechanism assembly and the two
springs h attaching the flame.
4.
Remove the two screws E and both sides rear
damper brackets from the dampers. Detach the CD
mechanism assembly from the left side to the right
side.
ATTENTION:
The CD mechanism assembly can be
removed if only the rear damper
bracket on the left side is removed.
CD mechanism
h
Front bracket
CD mechanism
D
Flame
assembly
D
assembly
h
D
Damper bracket
D
A
Fig.5
Fig.6
e
b
Damper bracket
a
h
c
D
d
CD mechanism
control board
h
D
Fix plate (L)
g
Fix arm (R)
D
Fig.7
Rear damper bracket
g
Fig.8
Rear damper bracket
E
Fix plate(R)
E
Fix arm (L)
Damper
1-10
Damper
g
g
Fig.9
KW-XC777
Removing the feed motor assembly
(See Fig.10)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor) and the CD mechanism assembly.
1.
Remove the two screws F and the feed motor
assembly.
Removing the pickup unit
(See Fig.10 and 11)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism assembly and
the feed motor assembly.
1.
Detach the FD gear part of the pickup unit upward.
Then remove the pickup unit while pulling out the
part i of the FD screw.
Feed motor assembly
F
FD gear
Nut push spring plate
FD screw
Pickup unit
Fig.10
Part i
Part j
Pickup unit
G
Pickup mount nut
Pickup unit
ATTENTION:
2.
Remove the screw G attaching the nut push spring
plate and the pickup mount nut from the pickup unit.
Pull out the FD screw.
When reattaching the pickup unit,
reattach the part j of the pickup unit,
then the part i of the FD screw.
Removing the spindle motor
(See Fig.12 and 13)
Prior to performing the following procedure, remove
the CD mechanism control board, the front bracket
(loading motor), the CD mechanism assembly and
the feed motor assembly.
1.
Turn up the CD mechanism assembly and remove
the two springs k on both sides of the clamper arms.
Open the clamper arm upward.
2.
Turn the turn table, and remove the two screws H
and the spindle motor.
k
FD screw
Spindle motor
Fig.11
k
Fig.12
H
H
Fig.13
1-11
KW-XC777
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 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 releasing each two joint tabs a in the direction
of the arrow.
Mode gear
Fig.1
Cassette guide
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
Joint b
Tab a
Fig.2
Fig.3
1-12
KW-XC777
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 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
assembly.
Cassette holder assembly
Side bracket
Joints c
Cassette holder assembly
Cassette stabilizer spring
Fig.4
Boss d
Cassette hanger assembly
Cassette hanger
assembly
Boss d
Cassette holder
assembly
Hook g
Fig.6
Hook f
Hook e
Fig.5
Cassette hanger assembly
Cassette catch
Cassette holder assembly
Cassette hanger assembly
Hook h
Fig.7
1-13
KW-XC777
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:
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.
After reattaching the side bracket
assembly, confirm operation.
Side bracket assembly
Joint i
Joint j
A
Side bracket assembly
Fig.8
Side bracket assembly
Joint i
Joint j
Load rack
Load rack
Boss k
Boss k
Fig.9
1-14
Fig.10
Removing the pinch arm (F) assembly
(See Fig.11 and 12)
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.11 and 13)
1.
Remove the polywasher and pull out the pinch arm
(R) assembly.
Removing the slide chassis assembly
(See Fig.14 and 15)
Polywasher
Polywasher
Compulsion spring
Pinch arm
(R) assembly
Fig.11
Pinch arm
(F) assembly
Pinch arm (F) assembly
Polywasher
KW-XC777
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 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.
Rack link
Fig.12
Boss m
Pinch arm
(R) assembly
Fig.13
Head
Hook n
Polywasher
Tape guide
Joint l
Slide chassis assembly
Fig.14
Joint l
Fig.15
1-15
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