JVC CH-X400 Manuale utente

SERVICE MANUAL

COMPACT DISC AUTOMATIC CHANGER

No.49585

Dec. 2000

CH-X400 / CH-X450

Contents

Safety precaution

Important for laser products

Location of main parts

Removal of main parts

JC 12 Forced eject procedures

1-2

1-3

1-4

1-5

1-19

Troubleshooting

Wiring connections

Pickup replacement procedure

Description of major ICs

1-20

1-26

1-27

1-29

This service manual is printed on 100% recycled paper.

Area Suffix

J Northern America

E Continental Europe

CH-X400

U Other areas

CH-X450

CH-X400/CH-X450

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-X400/CH-X450

1-3

Important for laser products

1.CLASS 1 LASER PRODUCT

2.DANGER : Invisible laser radiation when open and inter

lock failed or defeated. Avoid direct exposure to beam.

3.CAUTION : There are no serviceable parts inside the

Laser Unit. Do not disassemble the Laser Unit. Replace

the complete Laser Unit if it malfunctions.

4.CAUTION : The compact disc player uses invisible

laserradiation and is equipped with safety switches

whichprevent emission of radiation when the drawer is

open and the safety interlocks have failed or are de

feated. It is dangerous to defeat the safety switches.

5.CAUTION : If safety switches malfunction, the laser is able

to function.

6.CAUTION : Use of controls, adjustments or performance of

procedures other than those specified herein may result in

hazardous radiation exposure.

VARNING : Osynlig laserstrålning är denna del är öppnad

och spårren är urkopplad. Betrakta ej strålen.

VARO : Avattaessa ja suojalukitus ohitettaessa olet

alttiina näkymättömälle lasersäteilylle.Älä katso

säteeseen.

ADVARSEL : Usynlig laserstråling ved åbning , når

sikkerhedsafbrydere er ude af funktion. Undgå

udsættelse for stråling.

ADVARSEL : Usynlig laserstråling ved åpning,når

sikkerhetsbryteren er avslott. unngå utsettelse

for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

DANGER : Invisibie laser radiation

when open and interlock or

defeated.

AVOID DIRECT EXPOSURE TO

BEAM (e)

VARNING : Osynlig laserstrålning är

denna del är öppnad och spårren är

urkopplad. Betrakta ej strålen. (s)

VARO : Avattaessa ja suojalukitus

ohitettaessa olet alttiina

näkymättömälle lasersäteilylle.Älä

katso säteeseen. (d)

ADVARSEL :Usynlig laserstråling

ved åbning , når

sikkerhedsafbrydere er ude af

funktion. Undgå udsættelse for

stråling. (f)

CAUTION

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

Caution.

This production

contains laser

component

of higher laser class

than Class 1.

Top panel of the unit

Gerateoberseite

Panneau superieur de l"appereil

CH-X400/CH-X450

1-4

Location of main parts

Bottom view

Top side view

Remove the main board view

Main board ass'y Mechanism ass'y wire

Jack board ass'y

Mechanism board ass'ySensor board ass'y

Positioning

motor ass'y

Mechanism &

lifter unit

Positioning

motor ass'y

Feed motor

Spindle motor

Tray motorSensor board ass'y

Third gear

Magazine house

section

CH-X400/CH-X450

1-5

1. Remove the screw (1-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 arrow

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 (1) at the triangle

(A) 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.

Remove 1-a and

turn in the direction

of the arrow.

Fig. 1

Fig. 2

Fig. 3 Fig. 4

Exterior section

Removing the bottom cover and front panel

assembly 11

111-a

11-a

Remove 1-a and

turn in the

direction of the

arrow

Unhook catches

The front panel can be

separated by raising the

cover.

Slightly lift the

jack section to

remove.

Disassembling procedures

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 precautions.

(Use new grease when applying grease.)

Removal of main parts

CH-X400/CH-X450

1-6

Removing the top cover

1. Pull out the dampers, being careful not to damage.

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.

2.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.

3. Remove the three fixing screws (3) and (4) on the DIN jack

PCB assembly.

4. Lift the changer unit upward.

5. 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

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

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) Red

(magazine side)

Mechanism

Chassis

Remove the flexible ribbon

wire if required

CH-X400/CH-X450

1-7

Removing the fittings

Removing the main PCB assembly

1. Remove the fixing screw (5).

2. Unhook the two catches (a) on the top edge of the fitting,

then unhook the catches (b) at the left/right bottom edges.

1. Remove the power IC fixing screw (6).

2. Remove the four screws (7) securing the main PCB

assembly.

3. Disconnect position motor wire connector CN504 from the

main PCB assembly.

4. Disconnect sensor PCB assembly wire connector CN601

from the main PCB assembly.

5. Remove the flexible ribbon wire from CN502 on the traverse

mechanism PCB assembly.

When reinstalling the PC boards, refer to the reassembling

procedures for protecting switches, etc.

Catches (a)

Catches (b)

Fitting

7 CN601 7

Fig. 10

Fig. 11

CN504

CN502

CH-X400/CH-X450

1-8

Fig. 12

Fig. 13

Fig. 14

Sensor

assembly

Rear

Magazine lock spring

Poly-washer (b)

Positioning

motor assembly

Changer mechanism section

Sensor assembly unit

1. Remove the two screws (1) securing the sensor assembly

unit.

2. Unhook the springs on the back of the sensor assembly unit

from the holes on the chassis.

Magazine lock arm

1. Remove the magazine lock spring from the front side of the

chassis.

2. Remove the poly-washer (b) securing the magazine lock arm.

3.Turn the magazine lock arm in the direction of the arrow until

the notch is at the "C" position to remove it from the chassis.

Positioning motor assembly

1. Remove the two screws (2) securing the positioning motor.

2. Slightly lift the positioning motor assembly to remove it from

the two burrs on the chassis.

CH-X400/CH-X450

1-9

Can be removed at the stud position

(at the widest hole) Remove

Shift

Third gear

Fig. 15

Fig. 16

Fig. 17

Fig. 18

Remove the E-washer

Third gear

Slide and remove the rod inside

Slide

Rod

Top Plate

Remove

After lifting

Rear slider

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).

Front slider

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.

Top plate

1. Remove the nine screws (3) 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.

CH-X400/CH-X450

1-10

Lifter unit

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

remove the lifter unit from the chassis.

Lifter bracket

1. Remove the two lifter bracket fixing screws (4) located on the

back of the lifter unit.

2. Remove the lower rod.

Side bracket and traverse mechanism

1. Remove the two side bracket unit fixing screws (5) to

disconnect the side bracket unit from the lifter unit.

2. Remove the three shafts on the traverse mechanism

assembly from the lifter unit.

For reassembling, refer to the reassembling

procedures.

Fig. 19

Fig. 20

Fig. 21

Fig. 22

Unhook this

part first

Proper

orientation

Lift up the lifter unit

Lower rod

Remove from the

lifter unit

Remove from the

lifter unit

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