Jvc-UXM-3-R-Service-Manual.pdf

UX-M3R

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-M3R

Area suffix

B ------------------------------- U.K.

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

EN ------------ Northern Europe

EV -------------- Eastern Europe

MICRO COMPONENT SYSTEM UX-M3R

STANDBY

/ON

OPEN

/CLOSE

DISPLAY

MODE

REMAIN

/RDS MODE

STANDBY/ON

TIMER

ON/OFF

SET

INTRO/RDS

TUNER

/BAND

CD/RANDOM

TAPE

RANDOM

BAND

TUNER

TAPE

REC

PROGRAM

PRESET

SEARCH/TUNING

REPEAT

REMAIN

/RDS MODE

PHONES

SLEEP

PRE UP

VOLUME

PRE EQ

/HBS

STOP/CLEAR

PLAY/PAUSE

INTRO

/RDS SEARCH

REPEAT

/PRE DOWN

REC

TIMER

DISPLAY

MODE

PRE EQ

/HBS

VOLUME

MUTING

BEAT CUT

EJECT

RM-SUXM3R REMOTE CONTROL

FULL LOGIC DECK

CD SYNCHRO RECORDING

SP-UXM3

CA-UXM3R

SP-UXM3

Contents

Safety precautions

Preventing static electricity

Important for laser products

Disassembly method

Adjustment method

Flow of functional operation

until TOC read

1-2

1-3

1-4

1-5

1-14

Maintenance of laser pickup

Replacement of laser pickup

Trouble shooting

Description of major ICs

Wiring connections

1-18

1-19

1-20

1-29

1-17

No.21059

Jan. 2002

UX-M3R

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 each exposed 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.).

AC VOLTMETER

(Having 1000

ohms/volts,

or more sensitivity)

0.15 F AC TYPE

1500 10W

Place this

probe on

each exposed

metal part.

Good earth ground

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.

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.

In regard with component parts appearing on the silk-screen printed side (parts side) of the PWB diagrams, the

parts that are printed over with black such as the resistor ( ), diode ( ) and ICP ( ) or identified by the " "

mark nearby are critical for safety.

(This regulation does not correspond to J and C version.)

1-2

UX-M3R

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.

(caption)

Anti-static wrist strap

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.

4. Handling the traverse unit (optical pickup)

Do not subject the traverse unit (optical pickup) to strong shocks, as it is a sensitive, complex unit.

Remove solder of the short land on the card wire 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.

Handle the card wire carefully as it may break when subjected to strong force.

It is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

5. Attention when traverse unit is decomposed

Connector

Short land

*Please refer to "Disassembly method" in the text for the CD pickup unit.

Apply solder to the short land before the card wire is disconnected from

the connector on the CD pickup unit.

(If the card 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 card wire.

CD pickup unit

1-3

UX-M3R

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.

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

CLASS 1

LASER PRODUCT

1-4

UX-M3R

Disassembly method

Fuse(F902)

2A 250V

Power board

Replacement of the fuses and power amplifier IC

Fuse(F903)

1A 250V

Replacing the fuses (See Fig. 1.)

Remove the left side panel according to its

disassembly method (see Figs. 5 and 6 ).

Fuses are located inside the left side panel.

[Caution] Be sure to replace the required fuses

with designated ones.

Fuse(F901)

1A 250V

Fig.1

Replacing the power amplifier IC on

the main board (See Fig. 2.)

Soldered part a

Main board

Remove the main board according to its

disassembly method (see Figs. 17 and 18 ).

Remove the two screws A that attach the power

amplifier IC onto the heat sink.

Power amplifier IC

(IC401)

Heat sink

In order to replace the power amplifier IC, remove

the solder from soldered part a on the back side of

the main board.

Fig.2

1-5

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