JVC CH-X470RF J User manual

SERVICE MANUAL
CD CHANGER
No.49668
Dec. 2001
COPYRIGHT 2001 VICTOR COMPANY OF JAPAN, LTD.
CH-X470RF
CH-X470RF
Area Suffix
COMPACTDISCCHANGER
12–DISC
Contents
Safety precaution
Preventing static electricity
Disassembly method
Forced eject procedures
1-2
1-3
1-4
1-20
Trouble shooting
Flow of functional
operation until TOC read
Description of major ICs
1-21
1-23
1-27
J ------ Northern America
KS-RF50
CH-X470
CH-X470RF is a combination of CH-X470 and KS-RF50.
KS-RF50 is a combination of Remote control and the RF unit.

CH-X470RF
1-2
!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.
Safety precaution
!Please use enough caution not to see the beam directly or touch it in case of an
adjustment or operation check.

CH-X470RF
1-3
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.
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
Attention when traverse unit is decomposed
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.
*Please refer to "Disassembly method" in the text for pick-up and how to
detach the substrate.
(caption)
Anti-static wrist strap
Conductive material
(conductive sheet) or iron plate
Soldering
Pickup unit
Traverse mechanism PCB Ass'y

CH-X470RF
1-4
After removing the exterior (top and bottom).
Proceed to the pickup replacement section.
When applying grease, refer to the exploded view.
Use new grease.
1.
2.
3.
Remove the exterior (required section only).
The mechanism section is designed so that each unit
can be removed separately.
When reassembling, refer to the assembling
precautions. (Use new grease when applying grease.)
1.
2.
3.
Disassembly method
<Mechanism section>
<
Exterior section >
<Replacement of the pickup>
Remove the two screw Ato unlock the mounting
direction knob located on the side of the main unit.
Turn the mounting direction knob in the direction of
the arrow using a coin, etc. to remove it. (The knob
can be removed only when it is set to this position.)
Remove the four top cover fixing screws Bat the
triangle marks on the side of the main unit. (Perform
the same operation on both sides.)
Turn the unit upside down so the bottom surface is
facing upward.
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.
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.
1.
2.
3.
4.
5.
6.
Removing the bottom cover and front
panel assembly
(See Fig.1 to 4)
Perform operations according to the items to be
disassembled.
Fig. 1
Fig. 2
Fig. 3
Fig. 4
A
Unhook catches
Unhook catches
B
The front panel can be
separated by raising the cover.
Remove A and turn in
the direction of the arrow
Remove A and turn in
the direction of the arrow.
Slightly lift the jack
section to remove.
B
B
B
BB
A
B
B
Bottom cover
Knob
Bottom cover
Knob
Bottom cover
Front panel

CH-X470RF
1-5
Remove the four damper bracket fixing screws Cto
remove the damper brackets.
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.
Turn the damper spring bracket toward the top at a
right angle as shown in Fig. 7, then push down the
lower side of the damper spring bracket to lift it off.
Remove the three fixing screws Dand Eon the DIN
jack board assembly.
Lift the changer unit upward.
Remove the damper springs from the mechanism
chassis if required. To reassemble, refer to the
diagram below.
1.
2.
3.
4.
5.
6.
Removing the top cover
(See Fig.5 to 9)
Fig. 5
Turn to the top position (at a right angle),
then push down to lift off.
Lift the changer unit upward
How to attach the damper springs
Silver
(mechanism side)
Black
(magazine side)
Mechanism
Chassis
Remove the flexible ribbon
wire if required
C
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
C
C
C
E
E
D
Fig. 6
Fig. 7
Fig. 9
Fig. 6-1
Fig. 8
Fig. 8-1
Damper shaft
Damper
Damper spring Damper spring
DIN jack board
Damper spring bracket
Damper
Damper bracket
Damper
Damper bracket
Damper
Damper bracket
Damper bracket
Damper

CH-X470RF
1-6
Remove the fixing screw F.
Unhook the two catches aon the top edge of the
fitting, then unhook the two catches bat the left /
right bottom edges.
1.
2.
Removing the fittings (See Fig.10)
Remove the power IC fixing screw G.
Remove the four screws Hsecuring the main board
assembly.
Disconnect position motor wire connector CN504
from the main board assembly.
Disconnect sensor board assembly wire connector
CN601 from the main board assembly.
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.
1.
2.
3.
4.
5.
Removing the main PCB assembly
(See Fig.11)
Catches a
Catches b
Fitting F
H
CN601
CN504
CN502
H
G
Fig. 10
Fig. 11
H
Main board

CH-X470RF
1-7
<Changer mechanism section>
Remove the two screws Isecuring the sensor
assembly unit.
Unhook the spring on the back of the sensor
assembly unit from the holes on the chassis.
1.
2.
Sensor assembly unit (See Fig.12)
Remove the magazine lock spring from the front side
of the chassis.
Remove the poly-washer csecuring the magazine
lock arm.
Turn the magazine lock arm in the direction of the
arrow until the notch is at the dposition to remove it
from the chassis.
1.
2.
3.
Magazine lock arm (See Fig.12 and 13)
Remove the two screws Jsecuring the positioning
motor.
Slightly lift the positioning motor assembly to remove
it from the two burrs on the chassis.
1.
2.
Positioning motor assembly
(See Fig.14)
Sensor assembly I
Spring
Rear
Magazine lock spring
Poly-washer c
d
Positioning
motor assembly
J
Fig. 12
Fig. 13
Fig. 14
I

CH-X470RF
1-8
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).
Shift the rear slider in the direction of the arrow and
remove it at the rear slider mounting position (at the
widest hole).
1.
2.
Rear slider (See Fig.15)
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.
Remove the E-washer securing the front slider to
remove the front slider from the chassis
1.
2.
Front slider (See Fig.16)
Remove the nine screws Ksecuring the top plate.
Disconnect the section eattached to the rear of the
unit, then lift the top plate slightly.
Slide the top plate toward the rear of the unit to
remove the upper rod from the top plate.
1.
2.
3.
Top plate (See Fig.17 and 18)
Can be removed at the stud position
(at the widest hole) Remove
Shift
Third gear
Remove the E-washer
Third gear
Slide and remove the rod inside
Slide
Top plate
After lifting e
Fig. 15
Fig. 16
Fig. 17
Fig. 18
K
K
K
Remove
K
Rear slider
Front slider
Rod
Top plate

CH-X470RF
1-9
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.)
Lift the lifter unit upward, then remove the lower rod
to remove the lifter unit from the chassis.
1.
2.
Lifter unit (See Fig.19 and 20)
Remove the two lifter bracket fixing screws Llocated
on the back of the lifter unit.
Remove the lower rod.
1.
2.
Lifter bracket (See Fig.21)
Remove the two side bracket unit fixing screws Mto
disconnect the side bracket unit from the lifter unit.
Remove the three shafts on the traverse mechanism
assembly from the lifter unit.
1.
2.
Side bracket and traverse mechanism
assembly
(See Fig.22)
For reassembling, refer to the reassembling
procedures.
CAUTION:
Unhook this part first
Proper
orientation
Lift up the lifter unit
Lower rod
Remove from the lifter unit
Remove from the
lifter unit
Fig. 19
Fig. 20
Fig. 21
L
L
Fig. 22
M
M
Spring
Lifter unit
Lifter unit
Side bracket
Traverse mechanism
assembly
Lifter bracket

CH-X470RF
1-10
Remove the three screws Nfixing the mechanism
board on the back of the traverse mechanism.
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.
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.
Disconnect the wire from connector CN501 on the
mechanism board.
Remove the screw Oto remove the feed motor
assembly.
Remove the screw Pto remove the shaft holder
retaining the feed slide shaft assembly and the
middle gear.
Move the middle gear.
Move the pickup assembly upward from the gear
section and remove it from the traverse chassis
assembly.
Remove the two screws Qto remove the rack arm.
Pull out the feed slide shaft assembly.
Remove the screw Rto remove the spring.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Removing the mechanism board / pickup
assembly (See Fig.23 to 26)
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.
CAUTION:
Brown and black
Grounding point
N
Pickup assembly
Shaft holder
Feed slide
shaft assembly
Middle gear
Feed motor
Rack arm Pull out
R
Q
P
O
Chassis
Remove gears and
motors only when
required.
Fig. 23
Fig. 24
Fig. 26 Fig. 25
N
Spring
Red and black
Blue and white
Mechanism board
Short circuit round
(Grounding point)
Pickup
Flexible wire
CN501

CH-X470RF
1-11
Remove the two screws Ssecuring the tray motor.
Remove the two screws Tto remove the tray motor
assembly from the tray motor holder.
1.
2.
Tray motor (See Fig.27 and 28)
Remove the two screws Uretaining the chassis (L)
and (R) assemblies.
Slide the chassis (L) assembly toward the front and
detach it, then remove the chassis (L) upward.
1.
2.
Separation of the chassis (L) assembly
and chassis (R) assembly
(See Fig.29)
Tray motor assembly
Tray motor
Tray motor holder
Front side
S
T
U
U
Slide and remove upward
as shown by the arrow
Fig. 27
Fig. 28
Fig. 29
S
Chassis (L) assembly
Chassis (R) assembly

CH-X470RF
1-12
<Precautions on reassembling>
When mounting the pickup assembly, attach the feed
slide shaft assembly to the traverse chassis.
Apply E-JC-525 grease to the shaft.
Mount the middle gear and the feed slide shaft to the
traverse chassis and secure them with the screw P
through the shaft holder.
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.
To mount the rack arm, first move the pickup to the
middle position and secure it with the screws Q.
1.
2.
3.
4.
Mounting the traverse mechanism
(See Fig.30 to 34)
When reassembling, also refer to the
disassembling procedures.
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.
CAUTION:
Pickup assembly
Attached to chassis
Shaft holder
Middle gear
Motor
Chassis
Mounting the
feed motor assembly
Feed motor
Shaft holder Spindle motor
Mechanism board
Rack arm
N
Q
P
Feed slide shaft
(half coated with grease)
Move the pickup to
the middle position
Fig. 30
Fig. 31
Fig. 33
Fig. 32
N
N
CN501
Fig. 34
Short circuit round
(Grounding point)
Pickup
Flexible wire

CH-X470RF
1-13
Insert the shafts fof the traverse mechanism
assembly into the slide grooves gon the lifter unit.
Shift the hook of the lifter unit to the edge, and shift
the sliding lever inside the side bracket unit to the
edge as well.
With each hole and lever shifted to the edge, mount
the lifter unit and side bracket unit from the side.
(Check each attached section, and check that the
two shafts hof the lifter unit are correctly inserted
into the holes iof the side bracket unit. After
mounting, check that the levers move together. )
Turn the lifter unit upside down.
As shown in Fig. 35, slide the lever 30 mm away from
the edge, then mount the lifter bracket assembly.
1.
2.
3.
4.
Mounting the lifter unit
(See Fig.35 to 37)
f
f
f
h
Attach
Shift inside by approx. 30 mm
Expanded view
i
g
g
g
Fig. 35
Fig. 36
Fig. 37
Lifter unit
M
Side bracket
Traverse mechanism
assembly
Lifter bracket

CH-X470RF
1-14
Attach the lower rod to the chassis (R) assembly.
While shifting the rod toward the front side, mount
the rod on the lifter unit.
With the rod mounted, place the lifter unit on the
chassis (R) assembly.
Combine the chassis (L) and (R) assemblies so that
the hook section jof the chassis (L) assembly is
inserted into the notch of the chassis (R) assembly
by sliding it from the front side.
After engaging, secure with the two screws U.
Attach the tension spring between the lifter unit and
the chassis.
1.
2.
3.
4.
Connection of the chassis (L) assembly
and chassis (R) assembly
(See Fig.38 to 40)
Lower Rod
Notch
Attached
Slide to engage
Combine with (R) chassis
Set last (lifter side)
Proper
orientation
Tension spring
Set first
(chassis side)
U
j
Fig. 38
Fig. 39
Fig. 40
Lifter unit
Chassis (L) assembly
U
Chassis (R) assembly

CH-X470RF
1-15
Mount the upper rod on the lifter side land set it on
the rear of the top plate, then mount the other end of
the upper rod to m.
Check that the five points (n, o, p, sand r) are
correctly positioned.
When mounting section s, set it so that section tof
the lifter unit is pinched by the bending section of the
top plate.
Secure the top plate with six fixing screws K.
1.
2.
3.
Mounting the top plate
(See Fig.41 to 44)
nopsr
Upper rod
Section t
Lifter Unit
Point r
Expanded view of mounting s
m
Fig. 41
Fig. 42
Fig. 43Fig. 44
K
K
K
Top plate
l

CH-X470RF
1-16
Position the unit with the rear side facing down, then
rotate the third gear in the direction of the arrow
(clockwise) until the lift arm comes to the position at
which the holes are exposed, as shown in Fig. 45-1.
Mount the front slider from the top.
Rotate the third gear counterclockwise until the hole
of the slider is lined up with the right hole of the stud,
as shown in Fig. 45-2.
Mount the E-washer on the shaft.
Position the unit with the front side facing down, then
mount the rear slider. Check that the u, vand w
positions are correctly mounted as shown in Fig. 46.
Rotate the third gear in the direction of the arrow
(counterclockwise) until the lifter unit is at the top
position.
1.
2.
3.
4.
5.
Mounting the front slider and rear slider
(See Fig.45 and 46)
Fig. 45-1
Fig. 45
Fig. 45-2
Stud
E-Washer
Front slider
Check after mounting
Set so the holes
are exposed
uvw
Position so
that the stud
and right hole
are lined up
Rotate the third gear
to move the slider
Rotate until the
holes are lined up
Rotate the third gear
to move the slider
Fig. 46

CH-X470RF
1-17
Attach the longer spring to the white resin, and
attach the shorter spring temporarily to the sensor
assembly bracket.
Mount the sensor assembly so that the shaft of the
lift arm is inserted into the longer hole on the white
resin located on the back of the sensor board
assembly.
Attach the shorter spring to the hook of the lift arm.
1.
2.
3.
Mounting the sensor board assembly
(See Fig.47)
Rotate the third gear clockwise until section xof the
front slider and the third hole from the right are lined
up.
(Be sure to set properly. If incorrectly set, the
switches on the board assembly may be damaged.)
After they are correctly positioned, mount the main
board assembly.
1.
2.
Mounting the main PC board assembly
(See Fig.48)
Sensor assembly fixing screws
x
Attach
temporarily
Shorter spring
Longer spring
Shorter
spring
Position so that the slider hole and
third hole from the right are lined up
Fig. 47
Fig. 48
II

CH-X470RF
1-18
Remove the bottom cover, front panel and top cover
from the exterior section.
Unplug the flexible ribbon wire from connector
CN502 on the traverse mechanism PC board
assembly.
Turn the rear slider and third gear in the lifter section
counterclockwise until the traverse mechanism
assembly is in the lowermost (bottom) position.
Unsolder the two wires (black and brown) connected
to the tray motor.
Remove the two screws M from the round holes on
the chassis (R) assembly to remove the lifter bracket
(L).
Remove the lower rod.
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.
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.
Disconnect the wire from connector CN501 on the
mechanism board.
Remove the three fixing screws N from the round
holes on the chassis (R) assembly to remove the
traverse mechanism board assembly.
Remove the pickup shaft holder fixing screw P to
remove the pickup assembly.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Pickup replacement procedure
(See Fig.49 to 55)
When replacing the pickup, be sure to apply
countermeasures against static electricity
(grounding the operation table, wrist band
and soldering iron). To remove it, first short-
circuit the grounding point on the
mechanism board, then lift the mechanism
board assembly with CN501 connected.
Next, short-circuit the grounding point on
the pickup main unit, then unplug the pickup
flexible board from connector CN501.
CAUTION:
When reassembling, perform in the reverse
order.
CAUTION:
Third gear
M
NN
N
P
CN502
CN501
Unsolder
Lifter bracket (L)
Tray motor
assembly
Unsolder
Traverse mechanism
board assembly
Grounding point
Pickup assembly
Shaft holder
Spindle motor
M
Main PCB assembly
Feed motor
assembly
Fig. 49
Fig. 50
Fig. 51
Fig. 52
Short circuit round
(Drounding point)
Pickup
Flexible wire

CH-X470RF
1-19
Remove the two rack arm fixing screws Q.
Pull out the feed slide shaft.
Remove the shaft holder fixing screw R.
When mounting the lifter bracket after replacing the
pickup, shift the lifter unit lever approx. 30 mm
towards the inside, then mount the lifter bracket.
12.
13.
Shift approx. 30 mm
Shift approx. 30 mm
Pickup
Feed slide shaft
Rack arm
R
Shaft Holder
Middle gear
P
Lifter unit lever
Enlarged diagram
Q
Fig. 53
Fig. 54
Fig. 55
Pickup
Middle gear
Chassis

CH-X470RF
1-20
Forced eject procedures
Magazine eject does not function.
Completed
Completed
Press the magazine lock lever to
eject the magazine.
Rotate the third gear clockwise
until the lifter level is below the 9th
tray position.
Place the unit with its left side
facing down and apply a slight
shock, then return the tray to the
magazine.
Disconnect the tray from the hook.
Rotate the third gear clockwise and
unchuck the disc.
Remove the dampers and the top
cover to take out the mechanism.
Remove the item(s) causing the
disc-jam through the clearance at
the top of the lifter.
Remove the lifter bracket (L) and
return the tray to the magazine.
RESET (Press EJECT for 3 sec.) Completed
YES
YES
YES
NO
NO
NO
Remove the bottom cover
Is the disc set in the playing
position?
Are trays stored in
the magazine?
Check visually.
Improperly positioned
Peel off the sticker on the left side
of the unit. Insert a screwdriver
and press the internal lever to
forcibly eject the magazine.
Check that the trays remain no more
than 10 mm inside the magazine.