JVC CHX-550 Service manual
49787200301
CH-X550
SERVICE MANUAL
CD CHANGER
CH-X550
Area Suffix
E ------- Continental Europe
TABLE OF CONTENTS
1 Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
2 Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
3 Adjustment. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20
4 Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27
COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD.
No.49787
2003/01
CH-X550
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.
Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.
1-2 (No.49787)
1.2 Preventing 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.
1.2.1 Grounding to prevent damage by static electricity
Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.
Be careful to use proper grounding in the area where repairs are being performed.
(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) Ground yourself
Use an anti-static wrist strap to release any static electricity built up in your body.
(caption)
Anti-static wrist strap
CH-X550
1M
Conductive material
(conductive sheet) or iron plate
(3) Handling the optical pickup
• 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.)
• 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.
1.3 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.
1.4 Attention when traverse unit is decomposed
*Please refer to "Disassembly method" in the text for the CD pickup unit.
• Apply solder to the short land before the flexible wire is disconnected from the connector on the CD pickup unit.
(If the flexible wire is disconnected without applying solder, the CDpickup may be destroyed by static electricity.)
• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.
Short-circuit point
(Soldering)
Short-circuit point
Flexible wire
Pickup
Pickup
(No.49787)1-3
CH-X550
Disassembly method
2.1 Replacement of the pickup
(1) After removing the exterior (top and bottom).
(2) Proceed to the pickup replacement section.
(3) When applying grease, refer to the exploded view.
Use new grease.
2.2 Mechanism section
(1) Remove the exterior (required section only).
(2) The mechanism section is designed so that each unit can
be removed separately.
(3) When reassembling, refer to the assembling precautions
(Use new grease when applying grease.)
2.3 Exterior section
2.3.1 Removing the bottom cover and front panel assembly
(See Fig.1 to 4)
(1) Remove the two screw A to unlock the mounting direction
knob located on the side of the main unit.
(2) Turn the mounting direction knob in the direction of the ar-
row using a coin, etc. to remove it. (The knob can be removed only when it is set to this position.)
(3) Remove the four top cover fixing screws B at the triangle
marks on the side of the main unit. (Perform the same operation on both sides.)
(4) Turn the unit upside down so the bottom surface is facing
upward.
(5) Lift the rear edge of the bottom cover slightly and lift the
side by grasping the DIN jack section on the side panel,
then turn it toward the front (raise upward) to remove the
bottom cover.
(6) Unhook the four catches located on both sides of the front
panel, and turn the front panel toward the top cover (lower
down) to remove the front panel.
B
B
SECTION 2
Remove A and turn in
the direction of the arrow
The front panel can be
separated by raising the cover.
Bottom cover
Knob
Fig.2
Fig.3
A
BB
B
B
Bottom cover
Slightly lift the jack
section to remove.
B
1-4 (No.49787)
A
B
Bottom cover
Remove A and turn in
the direction of the arrow.
Fig.1
Unhook catches
Knob
Front panel
Unhook catches
Fig.4
CH-X550
2.3.2 Removing the top cover
(See Fig.5 to 9)
(1) Remove the four damper bracket fixing screws C to re-
move the damper brackets.
(2) Pull out the dampers, being careful not to damage them.
When reattaching a damper, insert your finger to push out
the center of the damper to mount it on the damper shaft,
as shown in Fig. 6-1.
(3) Turn the damper spring bracket toward the top at a right an-
gle as shown in Fig. 7, then push down the lower side of the
damper spring bracket to lift it off.
(4) Remove the three fixing screws D and E on the DIN jack
board assembly.
(5) Lift the changer unit upward.
(6) Remove the damper springs from the mechanism chassis
if required. To reassemble, refer to the diagram below.
Damper
Damper bracket
C
Turn to the top position (at a right angle),
then push down to lift off.
Damper spring bracket
Fig.7
Lift the changer unit upward
Damper
Damper bracket
C
Damper shaft
Damper
Damper
Damper bracket
Fig.5
Damper
C
Damper bracket
Fig.6
Apply alcohol to the shaft then immediately
attach the damper. (After attaching, check
that the shaft is correctly inserted.)
Push out with your finger
before attaching
Fig.6-1
C
Damper
spring
Silver
(mechanism
side)
Remove the flexible ribbon
wire if required
DIN jack board
How to attach the damper springs
Fig.8
Damper
spring
Mechanism
Chassis
Black
(magazine
side)
Fig.8-1
E
E
D
Fig.9
(No.49787)1-5
CH-X550
2.3.3 Removing the fittings
(See Fig.10)
(1) Remove the fixing screw F.
(2) Unhook the two catches a on the top edge of the fitting,
then unhook the two catches b at the left/right bottom edges.
2.3.4 Removing the main PCB assembly (See Fig.11)
(1) Remove the power IC fixing screw G.
(2) Remove the four screws H securing the main board as-
sembly.
(3) Disconnect position motor wire connector CN504 from the
main board assembly.
(4) Disconnect sensor board assembly wire connector CN601
from the main board assembly.
(5) Remove the flexible ribbon wire from CN502 on the
traverse mechanism board assembly. When reinstalling
the board boards, refer to the reassembling procedures for
protecting switches, etc.
Catches b
CN502
Catches a
Fitting
H
F
Fig.10
CN601
H
H
Main board
Fig.11
G
CN504
1-6 (No.49787)
CH-X550
2.4 CD mechanism assembly
2.4.1 Sensor assembly unit
(See Fig.1)
(1) Remove the two screws I securing the sensor assembly
unit.
(2) Unhook the spring on the back of the sensor assembly unit
from the holes on the chassis.
2.4.2 Magazine lock arm
(See Fig.1 and 2)
(1) Remove the magazine lock spring from the front side of the
chassis.
(2) Remove the poly-washer c securing the magazine lock
arm.
(3) Turn the magazine lock arm in the direction of the arrow un-
til the notch is at the d position to remove it from the chassis.
I
Spring
Rear
Sensor assembly
Fig.1
I
Magazine lock spring
2.4.3 Positioning motor assembly
(See Fig.3)
(1) Remove the two screws J securing the positioning motor.
(2) Slightly lift the positioning motor assembly to remove it
from the two burrs on the chassis.
d
Poly-washer c
Fig.2
J
Positioning
motor assembly
Fig.3
(No.49787)1-7
CH-X550
r
r
2.4.4 Rear slider
(See Fig.4)
(1) Position the unit with the front section facing down. Rotate
the third gear located on the back of the main unit in the direction of the arrow (clockwise).
(2) Shift the rear slider in the direction of the arrow and remove
it at the rear slider mounting position (at the widest hole).
2.4.5 Front slider
(See Fig.5)
(1) Position the unit with the rear section facing down. Rotate
the third gear located on the bottom of the unit in the direction
of the arrow (clockwise) until the front slider is shifted to the
outermost position.
(2) Remove the E-washer securing the front slider to remove
the front slider from the chassis
Can be removed at the stud position
(at the widest hole)
Shift
Fig.4
Remove
Third gear
Remove the E-washer
Rear slide
Front slide
2.4.6 Top plate
(See Fig.6 and 7)
(1) Remove the nine screws K securing the top plate.
(2) Disconnect the section e attached to the rear of the unit,
then lift the top plate slightly.
(3) Slide the top plate toward the rear of the unit to remove the
upper rod from the top plate.
Third gear
Top plate
K
K
Fig.5
Slide and remove the rod inside
Rod
K
Slide
Fig.6
Top plate
Remove
1-8 (No.49787)
After lifting
K
Fig.7
e
CH-X550
2.4.7 Lifter unit
(See Fig.8 and 9)
(1) Unhook the elevator spring located on the front side of the
unit. (Be sure to first unhook the spring from the lifter side
as shown in the upper part of the diagram.)
(2) Lift the lifter unit upward, then remove the lower rod to re-
move the lifter unit from the chassis.
Unhook this part first
Proper
orientation
Spring
Fig.8
Lifter unit
Lift up the lifter unit
Lower rod
2.4.8 Lifter bracket
(See Fig.10)
(1) Remove the two lifter bracket fixing screws L located on the
back of the lifter unit.
(2) Remove the lower rod.
L
Lifter bracket
L
Fig.10
2.4.9 Side bracket and traverse mechanism assembly
(See Fig.11)
(1) Remove the two side bracket unit fixing screws M to dis-
connect the side bracket unit from the lifter unit.
(2) Remove the three shafts on the traverse mechanism as-
sembly from the lifter unit.
CAUTION:
For reassembling, refer to the reassembling procedures.
Lifter unit
Fig.9
M
M
Side bracket
Traverse mechanism
assembly
Remove from the lifter unit
Fig.11
Remove from the
lifter unit
(No.49787)1-9
CH-X550
2.4.10 Removing the mechanism board / pickup assembly
(See Fig.12 to 15)
(1) Remove the three screws N fixing the mechanism board on
the back of the traverse mechanism.
(2) Disconnect the two feed motor wires (blue and white), two
spindle motor wires (red and black) and two tray motor wires
(brown and black) that are soldered to the mechanism
board.
(3) Short-circuit the grounding point on the mechanism board.
Move the mechanism board without disconnecting the wire
from connector CN501. Solder the short circuit round on
the pickup assembly.
(4) Disconnect the wire from connector CN501 on the mech-
anism board.
(5) Remove the screw O to remove the feed motor assembly.
(6) Remove the screw P to remove the shaft holder retaining
the feed slide shaft assembly and the middle gear.
(7) Move the middle gear.
(8) Move the pickup assembly upward from the gear section
and remove it from the traverse chassis assembly.
(9) Remove the two screws Q to remove the rack arm.
(10) Pull out the feed slide shaft assembly.
(11) Remove the screw R to remove the spring.
CAUTION:
To reattach the mechanism board, connect the pickup flexible wire to connector CN501 on the mechanism board before unsoldering the short circuit round. Subsequently, fix
the mechanism board using screws.
Red and black
CN501
Brown and black
Grounding point
Feed motor
Remove gears and
motors only when
required.
Pickup assembly
P
Shaft holder
Feed slide
shaft assembly
Middle gear
Chassis
O
Fig.14
R
Spring
N
Mechanism board
Pickup
Short circuit round
(Grounding point)
Blue and white
Fig.12
Fig.13
N
Flexible wire
Rack arm
Pull out
Q
Fig.15
1-10 (No.49787)
2.4.11 Tray motor
(See Fig.16 and 17 )
(1) Remove the two screws S securing the tray motor.
(2) Remove the two screws T to remove the tray motor as-
sembly from the tray motor holder.
CH-X550
S
S
Tray motor
2.4.12 Separation of the chassis (L) assembly and chassis (R) assembly
(See Fig.18 )
(1) Remove the two screws U retaining the chassis (L) and (R)
assemblies.
(2) Slide the chassis (L) assembly toward the front and detach
it, then remove the chassis (L) upward.
Slide and remove upward
as shown by the arrow
U
Fig.16
Tray motor assembly
Tray motor holder
T
Fig.17
U
Front side
Chassis (L) assembly
Chassis (R) assembly
Fig.18
(No.49787)1-11
CH-X550
2.4.13 Precautions on reassembling
CAUTION:
When reassembling, also refer to the disassembling procedures.
2.4.13.1 Mounting the traverse mechanism
(See Fig.19 to 23)
(1) When mounting the pickup assembly, attach the feed slide
shaft assembly to the traverse chassis.Apply E-JC-525
grease to the shaft.
(2) Mount the middle gear and the feed slide shaft to the
traverse chassis and secure them with the screw P through
the shaft holder.
(3) Before mounting the mechanism board, move the pickup to
the outer edge position, then secure the board assembly
using the screw N.
At this time, check that the rest switch is correctly placed.
(4) To mount the rack arm, first move the pickup to the middle
position and secure it with the screws Q.
CAUTION:
To reattach the mechanism board, connect the pickup flexible
wire to connector CN501 on the mechanism board before unsoldering the short circuit round. Subsequently, fix the mechanism board using screws.
Pickup assembly
Attached to chassis
P
Q
Rack arm
Move the pickup to
the middle position
Fig.21
Mechanism board
CN501
N
N
Motor
Motor
Pickup assembly
Fig.19
Shaft holder
Feed slide shaft
(half coated with grease)
Middle gear
Chassis
Mounting the
feed motor assembly
Attached to chassis
P
Shaft holder
Feed slide shaft
(half coated with grease)
Middle gear
N
Fig.22
Flexible wire
Pickup
Short circuit round
(Grounding point)
Fig.23
1-12 (No.49787)
Fig.20
Chassis
Mounting the
feed motor assembly
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