JVC MX-J300 Manuale utente

SERVICE MANUAL

COMPACT COMPONENT SYSTEM

No.20818

Jul. 2000

MX-J300

Flow of functional operation

unit TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

Area Suffix

CU.S.A.

Canada

Contents

Safety Precautions

Important for laser products

Preventing static electricity

Disassembly method

Adjustment method

1-2

1-3

1-4

1-5

1-24

1-27

1-28

1-29

COMPACT

DIGITAL AUDIO

STANDBY

VOLUME

PLAY& EXCHANGER

FM /AM

PLAY

REC/PLAY

AUTO REVERSE

EJECT

COMPACT

DIGITALAUDIO

TAPE

COMPU

PLAY

CONTROL

FULL - LOGIC CONTROL

1 BIT

DUAL D/A CONVERTER

AUX

PHONES

PANELOPEN / CLOSE

POWERED ROLLING PANEL

MX-J300

–

EJECT

POWER

/CLEAR

TAPE

CLOCK TIMER POWER

SLEEP

SELECT

–+

RM-SMXJ300VREMOTE CONTROL

2 3

4 5 6

AUX

FM/AM

FM MODE

PLAY MODE

CD3CD2CD1

A – TAPE - B

REC PAUSE

SOUND

MODE VOLUME ACTIVE

BASS EX.

SHIFT

7 8 9

SET

MX-J300

1-2

Safety Precautions

1.This design of this product contains special hardware and many circuits and components specially

for safety purposes. For continued protection, no changes should be made to the original design

unless authorized in writing by the manufacturer. Replacement parts must be identical to those

used in the original circuits. Services should be performed by qualified personnel only.

2. Alterations of the design or circuitry of the product should not be made. Any design alterations of

the product should not be made. Any design alterations or additions will void the manufacturer`s

warranty and will further relieve the manufacture of responsibility for personal injury or property

damage resulting therefrom.

3. Many electrical and mechanical parts in the products have special safety-related characteristics.

These characteristics are often not evident from visual inspection nor can the protection afforded

by them necessarily be obtained by using replacement components rated for higher voltage,

wattage, etc. Replacement parts which have these special safety characteristics are identified in

the Parts List of Service Manual. Electrical components having such features are identified by

shading on the schematics and by ( ) on the Parts List in the Service Manual. The use of a

substitute replacement which does not have the same safety characteristics as the recommended

replacement parts shown in the Parts List of Service Manual may create shock, fire, or other

hazards.

4. The leads in the products are routed and dressed with ties, clamps, tubings, barriers and the

like to be separated from live parts, high temperature parts, moving parts and/or sharp edges

for the prevention of electric shock and fire hazard. When service is required, the original lead

routing and dress should be observed, and it should be confirmed that they have been returned

to normal, after re-assembling.

5. Leakage currnet check (Electrical shock hazard testing)

After re-assembling the product, always perform an isolation check on the exposed metal parts

of the product (antenna terminals, knobs, metal cabinet, screw heads, headphone jack, control

shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

Do not use a line isolation transformer during this check.

Plug the AC line cord directly into the AC outlet. Using a "Leakage Current Tester", measure

the leakage current from each exposed metal parts of the cabinet , particularly any exposed

metal part having a return path to the chassis, to a known good earth ground. Any leakage

current must not exceed 0.5mA AC (r.m.s.)

Alternate check method

Plug the AC line cord directly into the AC outlet. Use an AC voltmeter having, 1,000 ohms

per volt or more sensitivity in the following manner. Connect a 1,500 10W resistor paralleled by

a 0.15 F AC-type capacitor between an exposed

metal part and a known good earth ground.

Measure the AC voltage across the resistor with the

AC voltmeter.

Move the resistor connection to eachexposed metal

part, particularly any exposed metal part having a

return path to the chassis, and meausre the AC

voltage across the resistor. Now, reverse the plug in

the AC outlet and repeat each measurement. voltage

measured Any must not exceed 0.75 V AC (r.m.s.).

This corresponds to 0.5 mA AC (r.m.s.).

Warning

1.This equipment has been designed and manufactured to meet international safety standards.

2. It is the legal responsibility of the repairer to ensure that these safety standards are maintained.

3. Repairs must be made in accordance with the relevant safety standards.

4. It is essential that safety critical components are replaced by approved parts.

5. If mains voltage selector is provided, check setting for local voltage.

Good earth ground

Place this

probe on

each exposed

metal part.

AC VOLTMETER

(Having 1000

ohms/volts,

or more sensitivity)

1500 10W

0.15 F AC TYPE

CAUTION

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.

MX-J300

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.

CAUTION

Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

MX-J300

1-4

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

In the equipment which uses optical pick-up (laser diode), optical pick-up is destroyed by the static electricity of

the work environment.

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

Conductive material

(conductive sheet) or iron plate

(caption)

Anti-static wrist strap

Attention when traverse unit is decomposed

1. Remove the disk stopper and T. bracket on the CD changer mechanism

assembly.

2. Disconnect the harness from connector on the CD motor board.

3. CD traverse unit is put up as shown in Fig.1.

4. Solder is put up before the card wire is removed from connector CN601

on the CD servo control board as shown in Fig. 2.

(When the wire is removed without putting up solder, the CD pick-up

assembly might destroy.)

5. Please remove solder after connecting the card wire with CN601 when

you install picking up in the substrate.

*Please refer to "Disassembly method" in the text for pick-up and how to

detach the CD traverse mechanism.

Soldering

Fig.1

Fig.2

CD changer

mechanism

assembly

CD traverse

unit

Flexible cable

MX-J300

1-5

Remove the six screws Aattaching the metal cover

on the back of the body.

Remove the two screws Bon both sides of the body.

Remove the metal cover from the body while lifting

up the rear part of the metal cover.

Removing the metal cover(See Fig.1 to 3)

Disassembly method

Fig.3

Fig.2

Fig.1

Metal cover

MX-J300

1-6

Prior to performing the following procedures, remove

the metal cover.

Remove the two screws Cattaching the CD changer

mechanism assembly on the top of the body.

Disconnect the card wire from connector CN303 on

top of the main board.

Remove the plastic rivet afixing the main board to

the front panel assembly on the left side of the body.

Remove the two screws Dfrom the rear panel.

Detach upward the rear part of the CD changer

mechanism assembly while pulling the front panel

assembly and the rear panel outward, then pull out

the front part backward and upward.

Removing the CD changer mechanism

assembly (See Fig.4 to 7)

Fig.6

Fig.5

Fig.4

Fig.7

Pull outward

Main board

CN303

Plastic rivet a

CN303

CD changer mechanism assembly

Rear panel

Front panel

assembly

Rear panel

CD changer

mechanism

assembly

CD changer mechanism

assembly

Rear panel

Front panel

assembly

Pull outward

Main board

MX-J300

1-7

Prior to performing the following procedures, remove

the metal cover and the CD changer mechanism

assembly.

Disconnect the card wires from connector CN301,

CN304, CN305 and the harness from CN302 on the

inside of the main board.

Turn over the body and remove the two screws E.

Release the joint bon the bottom of the body and

the joints cand don both sides of the body using a

screwdriver, and detach the front panel assembly

toward the front.

Removing the front panel assembly

(See Fig.8 to 12)

Fig.10

Fig.9

Fig.8

Fig.11

Fig.12

Main board

Front panel

assembly

Main board

CN301

CN304

CN305

CN302

CN901A,CN901B

EFront panel

assembly

Joint b

Front panel

assembly

Joint c

Front panel

assembly Joint d

(Bottom)

MX-J300

1-8

Prior to performing the following procedures, remove

the metal cover and the CD changer mechanism

assembly.

It is not necessary to remove the front panel

assembly.

Remove the two screws Fand the rear cover on the

back of the body.

Remove the four screws Gand the six screws H

attaching the main board and the heat sink to the

rear panel.

Remove the screw Iattaching the rear panel to the

base chassis.

Release the lower two joints eand fon both sides of

the rear panel using a screwdriver and detach the

rear panel backwards.

Removing the rear cover and the rear

panel (See Fig.13 to 16)

Fig.13

Fig.14

Fig.15

Fig.16

Rear panel

Rear cover

Rear panel Joint e

Rear panel

Joint f

(To Earth bracket)

MX-J300

1-9

Prior to performing the following procedures, remove

the metal cover, the CD changer mechanism

assembly and the rear cover, rear panel.

It is not necessary to remove the front panel

assembly.

Disconnect the card wires from connector CN301,

CN304, CN305 and the harnesses from CN302,

CN901A and CN901B on the inside of the main

board.

From the right side of the body, remove the screw J

attaching the main board to the base chassis.

Removing the main board

(See Fig.17 to 20)

Prior to performing the following procedure, remove

the rear panel.

Remove the two screws Kand the screw Lattaching

the heat sink to the main board. Remove the IC

bracket 1 and 2 on the back of the heat sink.

Pull out the heat sink toward you.

~To remove the heat sink from

the main board~

Fig.17

Fig.18

Rear panel

Main board

CN301

CN304

CN305

CN302

CN901A,CN901B

Fig.19

Heat sink

Main board

Fig.20

Heat sink

IC bracket 2

IC bracket 1

MX-J300

1-10

Prior to performing the following procedure, remove

the metal cover and the CD changer mechanism

assembly.

Disconnect the harness from connector CN901A and

CN901B on the inside of the main board.

Cut off the tie band gof the power transformer

assembly and unsolder the power cord.

(Make sure to bundle the wires after repair.)

Remove the four screws Mattaching the power

transformer assembly.

When removing the power transformer assembly

with the power cord, remove the rear panel and pull

out the power cord stopper from the bottom chassis

upward.

Removing the power transformer

assembly (See Fig.21 to 23)

Fig.21

Fig.22

Fig.23

Power transformer assembly

Tie band g

CN901A,CN901B

MPower transformer

assembly

Tie band g

Power transformer

assembly

Power cord stopper

Rear panel

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