Jvc Ch-x550 User manual

SERVICE MANUAL

2004/1

CD CHANGER

49787B20041CH-X550,CH-X500

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-23

Area suffix

E ----------- Continental Europe

CH-X550

CH-X500

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1-2 (No.49787B)

SPECIFICATION

CD CHANGER SECTION Frequency response 5 Hz - 20000Hz

Dynamic range 93dB

S/N ratio 96dB

Distortion 0.01%

Wow & Flutter Less than measurable limit

Output terminal Analog ( 8 pin ×1 ), 1.5V ( full scale )/less than 1k Ω

GENERAL Power requirement Operating voltage DC 14.4 V (11 V - 16 V allowable)

Grounding system Negative ground

Allowable working temperature -10°C to +50°C (14°F to 122°F)

Dimensions (W ×H ×D) 252 mm ×88 mm ×174 mm (9-15/16" ×3-1/2" ×6-7/8")

Mass 2.3 kg (5.1lbs.) (excluding accessories)

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(No.49787B)1-3

SECTION 1

PRECAUTION

1.1 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.

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1-4 (No.49787B)

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 CD 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.

(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) It 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 CD pickup may be destroyed by static electricity.)

• In the assembly, be sure to remove solder from the short land after connecting the flexible wire.

1M

(caption)

Anti-static wrist strap

Conductive material

(conductive sheet) or iron plate

Short circuit round

(Grounding point)

Pickup

Flexible wire

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(No.49787B)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 How to recognize

C101 C102

C103

C104

C105

C106

C107

C108

C109

C110

C201C202

C203

C204

C205

C206

C208

C209

C501

C502C503

C504

C505

C507

C508

C509

C510

C511

C512

C513

C514

C521

C522

C523

C524

C525

C526

C527

C528

C529

C530

C531

C533

C534

C535

C536

C537

C538

C539

C540

C541

C542

C543

C544

C545

C546

C547

C548

C549

C550

C551

C552

C553

C554

C555

C581

C582

C583

C584

C601

C602

C603

C604

C605

C606

C609

C610

C611

C612

C651

C901

C902

C906

C907

C912 C913

C914

C915

C941

C942

C943

C944

C945

C982

C983 C984

CN503

CN504

CN601

CN904

D101

D581

D911

D912

D913

D921

D941

D951

D981

IC101

IC501

IC521

IC581

IC601

IC602

IC604

IC651

L521

L522

L524

L601

Q101

Q201

Q501

Q581

Q582Q583

Q602

Q901

Q902

Q911 Q921

Q922

Q941

Q942

Q943

Q944

Q971

Q972

Q981

R101

R102

R103

R104

R105

R106

R107

R108

R109

R110

R111

R201

R202

R203

R204

R205

R206

R207

R208

R209

R210

R211

R503

R504

R505

R506

R507

R508

R509

R510

R511

R512

R513

R514

R515

R516

R517

R518

R519

R521

R522

R523

R524

R525

R527

R528

R531

R532

R534

R535

R536

R537

R538

R539

R543

R544

R581

R582

R583

R584

R585

R586

R601

R602

R603

R604

R605

R606

R607

R609

R610

R611

R612

R614

R617

R618

R619

R620

R621

R622

R623

R624

R625

R626

R627

R628

R629

R630

R631

R651

R652

R653

R654

R655

R656

R657

R658

R659

R660

R661

R901

R902

R903

R911

R912

R921

R923

R924

R925

R926

R941

R942

R943

R951

R954

R971

R972

R973

R981

R982

S601

S606

X521

X601

C908

C613

A new board has the display of "LVA10455" in a circuit board.

N3

SERIAL NO.

CD CHANGER

for CAR USE

MODEL NO. CH-X550

VICTOR COMPANY OF JAPAN. LIMITED

DC 12 V NEGATIVE GROUND

MADE IN INDONESIA

A new board has the display of "N3" in a nameplate.

e24

020268

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1-6 (No.49787B)

SECTION 3

DISASSEMBLY

• Perform operations according to the items to be disassembled.

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.

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 precau-

tions. (Use new grease when applying grease.)

3.1 Exterior section

3.1.1 Removing the bottom cover and front panel assembly

(See Fig.1 to 4)

(1) Remove the two screw Ato 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 re-

moved only when it is set to this position.)

(3) Remove the four top cover fixing screws Bat the triangle

marks on the side of the main unit. (Perform the same op-

eration 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.

Fig.1

Fig.2

Fig.3

Fig.4

A

B

Remove A and turn in

the direction of the arrow.

B

Bottom cover

Knob

Remove A and turn in

the direction of the arrow

BB

A

B

Bottom cover

Knob

The front panel can be

separated by raising the cover.

Slightly lift the jack

section to remove.

Bottom cover

Unhook catches

Front panel

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(No.49787B)1-7

3.1.2 Removing the top cover

(See Fig.5 to 9)

(1) Remove the four damper bracket fixing screws Cto 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 Dand Eon 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.

Fig.5

Fig.6

Fig.6-1

Fig.7

Fig.8

Fig.8-1

Fig.9

C

Damper

Damper bracket

Damper

Damper bracket

C

Damper

Damper bracket

Damper

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

Damper shaft

Damper

Turn to the top position (at a right angle),

then push down to lift off.

Damper spring bracket

Lift the changer unit upward

How to attach the damper springs

Silver

(mechanism side)

Black

(magazine side)

Mechanism

Chassis

Damper spring Damper spring

Remove the flexible ribbon

wire if required

E

D

DIN jack board

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1-8 (No.49787B)

3.1.3 Removing the fittings

(See Fig.10)

(1) Remove the fixing screw F.

(2) Unhook the two catches aon the top edge of the fitting, then

unhook the two catches bat the left / right bottom edges.

Fig.10

3.1.4 Removing the main PCB assembly

(See Fig.11)

(1) Remove the power IC fixing screw G.

(2) Remove the four screws Hsecuring 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.

Fig.11

Catches a

Catches b

Fitting

F

H

CN601

CN504

CN502

H

G

H

Main board

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(No.49787B)1-9

3.2 CD mechanism assembly

3.2.1 Sensor assembly unit

(See Fig.1)

(1) Remove the two screws Isecuring the sensor assembly

unit.

(2) Unhook the spring on the back of the sensor assembly unit

from the holes on the chassis.

3.2.2 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 csecuring the magazine lock

arm.

(3) Turn the magazine lock arm in the direction of the arrow un-

til the notch is at the dposition to remove it from the chas-

sis.

Fig.1

Fig.2

3.2.3 Positioning motor assembly

(See Fig.3)

(1) Remove the two screws Jsecuring the positioning motor.

(2) Slightly lift the positioning motor assembly to remove it

from the two burrs on the chassis.

Fig.3

Sensor assembly I

Spring

I

Rear Magazine lock spring

Poly-washer c

d

Positioning

motor assembly

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1-10 (No.49787B)

3.2.4 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 di-

rection 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).

Fig.4

3.2.5 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 direc-

tion 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

Fig.5

3.2.6 Top plate

(See Fig.6 and 7)

(1) Remove the nine screws K securing the top plate.

(2) Disconnect the section eattached 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.

Fig.6

Fig.7

Can be removed at the stud position

(at the widest hole) Remove

Shift

Third gear

Rear slide

r

Remove the E-washer

Third gear

Front slide

r

Slide and remove the rod inside

Slide

Top plate

K

Rod

After lifting e

Remove

K

Top plate

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(No.49787B)1-11

3.2.7 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.

Fig.8

Fig.9

3.2.8 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.

Fig.10

3.2.9 Side bracket and traverse mechanism assembly

(See Fig.11)

(1) Remove the two side bracket unit fixing screws Mto 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.

Fig.11

Unhook this part first

Proper

orientation

Spring

Lift up the lifter unit

Lower rod

Lifter unit

L

LLifter bracket

Remove from the lifter unit

Remove from the

lifter unit

M

Lifter unit

Side bracket

Traverse mechanism

assembly

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1-12 (No.49787B)

3.2.10 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 mecha-

nism 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 mecha-

nism board.

(5) Remove the screw O to remove the feed motor assembly.

(6) Remove the screw Pto 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 Qto remove the rack arm.

(10) Pull out the feed slide shaft assembly.

(11) Remove the screw Rto remove the spring.

CAUTION:

To reattach the mechanism board, connect the pickup flexible

wire to connector CN501 on the mechanism board before un-

soldering the short circuit round. Subsequently, fix the mecha-

nism board using screws.

Fig.12

Fig.13

Fig.14

Fig.15

Brown and black

N

Red and black

Blue and white

Mechanism board

CN501

Short circuit round

(Grounding point)

Pickup

Flexible wire

Grounding point

Pickup assembly

Shaft holder

Feed slide

shaft assembly

Middle gear

Feed motor

P

O

Chassis

Remove gears and

motors only when

required.

Rack arm Pull out

R

Q

Spring

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TEL 13942296513 QQ 376315150 892498299

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(No.49787B)1-13

3.2.11 Tray motor

(See Fig.16 and 17 )

(1) Remove the two screws Ssecuring the tray motor.

(2) Remove the two screws Tto remove the tray motor as-

sembly from the tray motor holder.

Fig.16

Fig.17

3.2.12 Separation of the chassis (L) assembly and chassis (R) assembly

(See Fig.18 )

(1) Remove the two screws Uretaining the chassis (L) and (R)

assemblies.

(2) Slide the chassis (L) assembly toward the front and detach

it, then remove the chassis (L) upward.

Fig.18

Tray motor assembly

SS

Tray motor

Tray motor holder

T

Front side

UU

Slide and remove upward

as shown by the arrow

Chassis (L) assembly

Chassis (R) assembly

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

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6

5

1

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2

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1

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-14 (No.49787B)

3.2.13 Precautions on reassembling

CAUTION:

When reassembling, also refer to the disassembling proce-

dures.

3.2.13.1 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 un-

soldering the short circuit round. Subsequently, fix the mecha-

nism board using screws.

Fig.19

Fig.20

Fig.21

Fig.22

Fig.23

Pickup assembly

Attached to chassis

Shaft holder

Middle gear

Motor

Chassis

Mounting the

feed motor assembly

P

Feed slide shaft

(half coated with grease)

Pickup assembly

Attached to chassis

Shaft holder

Middle gear

Motor

Chassis

Mounting the

feed motor assembly

P

Feed slide shaft

(half coated with grease)

Rack arm

Q

Move the pickup to

the middle position

Mechanism board

N

CN501

Short circuit round

(Grounding point)

Pickup

Flexible wire

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

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2

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2

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1

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6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

(No.49787B)1-15

3.2.13.2 Mounting the lifter unit

(See Fig.24 to 26)

(1) Insert the shafts f of the traverse mechanism assembly into

the slide grooves gon the lifter unit.

(2) Shift the hook of the lifter unit to the edge, and shift the slid-

ing lever inside the side bracket unit to the edge as well.

(3) With each hole and lever shifted to the edge, mount the lift-

er unit and side bracket unit from the side. (Check each at-

tached 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. )

(4) Turn the lifter unit upside down.As shown in Fig. 35, slide

the lever 30mm away from the edge, then mount the lifter

bracket assembly.

Fig.24

Fig.25

Fig.26

f

h

Attach

i

g

Lifter unit

M

Side bracket

Traverse mechanism

assembly

Shift inside by approx. 30 mm

Expanded view

Lifter bracket

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

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4

2

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3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-16 (No.49787B)

3.2.13.3 Connection of the chassis (L) assembly and chassis (R) assembly

(See Fig.27 to 29)

(1) 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.

(2) Combine the chassis (L) and (R) assemblies so that the

hook section j of the chassis (L) assembly is inserted into

the notch of the chassis (R) assembly by sliding it from the

front side.

(3) After engaging, secure with the two screws U.

(4) Attach the tension spring between the lifter unit and the

chassis.

Fig.27

Fig.28

Fig.29

Lower Rod

Lifter unit

Notch Attached

j

Slide to engage

Combine with (R) chassis

Set last (lifter side)

Proper

orientation

Tension spring

Set first

(chassis side)

U

Chassis (L) assembly

U

Chassis (R) assembly

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

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4

2

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1

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

(No.49787B)1-17

3.2.13.4 Mounting the top plate

(See Fig.30 to 33)

(1) Mount the upper rod on the lifter side l and set it on the rear

of the top plate, then mount the other end of the upper rod

to m.

(2) Check that the five points (n, o, p, sand r) are correctly po-

sitioned.

When mounting section s, set it so that section t of the lifter

unit is pinched by the bending section of the top plate.

(3) Secure the top plate with six fixing screws K.

Fig.30

Fig.31

Fig.32

Fig.33

Upper rod

m

l

K

Top plate

Section t

Lifter Unit

Point r

Expanded view of mounting s

nops

r

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

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5

1

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Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-18 (No.49787B)

3.2.13.5 Mounting the front slider and rear slider

(See Fig.34 and 35)

(1) 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 ex-

posed, as shown in Fig. 34

(2) 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. 34

(3) Mount the E-washer on the shaft.

(4) Position the unit with the front side facing down, then

mount the rear slider. Check that the u, vand wpositions

are correctly mounted as shown in Fig. 35.

(5) Rotate the third gear in the direction of the arrow (counter-

clockwise) until the lifter unit is at the top position.

Fig.34

Fig.35

Stud

E-Washer

Front slider

Check after mounting

Set so the holes

are exposed

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

uvw

Rotate the third gear

to move the slider

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

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4

2

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1

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1

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7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

(No.49787B)1-19

3.2.13.6 Mounting the sensor board assembly

(See Fig.36)

(1) Attach the longer spring to the white resin, and attach the

shorter spring temporarily to the sensor assembly bracket.

(2) 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.

(3) Attach the shorter spring to the hook of the lift arm.

Fig.36

3.2.13.7 Mounting the main PC board assembly

(See Fig.37)

(1) Rotate the third gear clockwise until section x of 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.)

(2) After they are correctly positioned, mount the main board

assembly.

Fig.37

Sensor assembly fixing screws

A

ttach

temporarily

Shorter spring

Longer spring

Shorter

spring

II

x

Position so that the slider hole and

third hole from the right are lined up

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

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4

2

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1

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3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

1-20 (No.49787B)

3.2.13.8 Pickup replacement procedure

(See Fig.38 to 44)

(1) Remove the bottom cover, front panel and top cover from

the exterior section.

(2) Unplug the flexible ribbon wire from connector CN502 on

the traverse mechanism PC board assembly.

(3) Turn the rear slider and third gear in the lifter section coun-

terclockwise until the traverse mechanism assembly is in

the lowermost (bottom) position.

(4) Unsolder the two wires (black and brown) connected to the

tray motor.

(5) Remove the two screws Mfrom the round holes on the

chassis (R) assembly to remove the lifter bracket (L).

(6) Remove the lower rod.

(7) 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 mecha-

nism board.

(8) 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.

(9) Disconnect the wire from connector CN501 on the mecha-

nism board.

(10) Remove the three fixing screws Nfrom the round holes on

the chassis (R) assembly to remove the traverse mecha-

nism board assembly.

(11) Remove the pickup shaft holder fixing screw Pto remove

the pickup assembly.

CAUTION:

When replacing the pickup, be sure to apply counter-

measures against static electricity (grounding the opera-

tion 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.

(12) Remove the two rack arm fixing screws Q.

Pull out the feed slide shaft.

Remove the shaft holder fixing screw R.

(13) 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.

Fig.38

Fig.39

Fig.40

Fig.41

Third gear

M

CN502

Unsolder

Lifter bracket (L)

M

Main PCB assembly

Feed moto

r

assembly

NN

N

CN501

Tray motor

assembly

Unsolder

Traverse mechanism

board assembly

Grounding point

P

Pickup assembly

Shaft holder

Spindle motor

Short circuit round

(Drounding point)

Pickup

Flexible wire

w

.

x

i

a

o

y

u

1

6

3

.

c

o

m

Q

3

7

6

3

1

5

1

5

0

9

2

8

9

4

2

9

8

T

E

L

1

3

9

4

2

9

6

5

1

3

9

2

8

9

4

2

9

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0

5

1

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1

3

6

7

3

Q

TEL 13942296513 QQ 376315150 892498299

http://www.xiaoyu163.com

JVC CH-X550 User manual

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