JVC UXM-3-R Service manual

SERVICE MANUAL

MICRO COMPONENT SYSTEM

UX-M3R

Area suffix

B ------------------------------- U.K.
E ----------- Continental Europe
EN ------------ Northern Europe
EV -------------- Eastern Europe

UX-M3R

STANDBY/ON

TUNER

CD/RANDOM TAPE

/BAND

REC

PROGRAM

REMAIN

SLEEP PRE UP

/RDS MODE

REPEAT

INTRO

TIMER

/PRE DOWN

/RDS SEARCH

PRE EQ

DISPLAY

+

/HBS

MODE

VOLUME

MUTING

BEAT CUT

Ð

RM-SUXM3R REMOTE CONTROL

SP-UXM3

Contents

Safety precautions
Preventing static electricity
Important for laser products
Disassembly method
Adjustment method
Flow of functional operation
until TOC read

MICRO COMPONENT SYSTEM UX-M3R

STANDBY

/ON

DISPLAY

MODE

TIMER

ON/OFF

SET

RANDOM

CD

PROGRAM

PRESET

REPEAT

PHONES

REC

STOP/CLEAR PLAY/PAUSE

FULL LOGIC DECK

CD SYNCHRO RECORDING

BAND

TUNER TAPE

SEARCH/TUNING

OPEN

/CLOSE

REMAIN

/RDS MODE

INTRO/RDS
SEARCH

VOLUME

PRE EQ

/HBS

EJECT

CA-UXM3R SP-UXM3

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

1-17

1-18
1-18
1-19
1-20
1-29

COPYRIGHT 2002 VICTOR COMPANY OF JAPAN, LTD.

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.).

0.15 F AC TYPE

1500 10W

Good earth ground

AC VOLTMETER
(Having 1000
ohms/volts,
or more sensitivity)

Place this
probe on
each exposed
metal part.

!

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

1.
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

2.
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.

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.

3.

Handle the card wire 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.

5. Attention when traverse unit is decomposed

Connector

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

Short land

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.

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.

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.

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

Disassembly method

<Main body section>

Replacement of the fuses and power amplifier IC

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(F903)

1A 250V

UX-M3R

Fuse(F902)

2A 250V

Power board

Fuse(F901)

1A 250V

Replacing the power amplifier IC on

the main board (See Fig. 2.)

Remove the main board according to its
disassembly method (see Figs. 17 and 18).

1.

Remove the two screws A that attach the power
amplifier IC onto the heat sink.

2.

In order to replace the power amplifier IC, remove
the solder from soldered part a on the back side of
the main board.

Soldered part a

A

Fig.1

Main board

Power amplifier IC

(IC401)

Heat sink

Fig.2

1-5

UX-M3R

Removing the right side panel

(See Figs. 3 and 4.)

1.2.From the right side of the main body, remove the
three screws B and three screws C retaining the
right side panel.

Slide the right side panel toward the rear (in the
direction of arrow 1) until the claw b at the back of
the panel is hooked by the chassis and then lift the
panel upward (in the direction of arrow 2) to
remove it.

B

C

(Long)

Right side
panel

(Long)

C

Removing the left side panel

(See Figs. 5 and 6.)

1.2.From the left side of the main body, remove the
three screws B and three screws C retaining the
left side panel.

Slide the left side panel toward the rear (in the
direction of arrow 3) until the claw c at the back of
the panel is hooked by the chassis, and then lift the
panel upward (in the direction of arrow 4) to
remove it.

Left side
panel

C

(Long)

B

B

Fig.3

2

Right side
panel

1

Claw b

Fig.4

1-6

C

(Long)

B

Fig.5

Left side
panel

4

3

Claw c

Fig.6

UX-M3R

Removing the top cover

(See Figs. 7 and 8.)

Remove the left and right side panels.

1.2.From the back side of the main body, loosen the
two screws D retaining the top cover.

Lift the rear part of the top cover to remove it.

Removing the front panel assembly

(See Figs. 9 to 11.)

Remove the left and right side panels.
Remove the top cover.

1.

Remove the tie band bundling the wires.

2.

Disconnect the wire from the connector CN902 on
the power board.

3.

Disconnect the wire from the connector on the
cassette switch board.

4.

Remove the screw E retaining the bracket on the
ear phone board.

5.

Disconnect the wires from the two connectors
CN201 and CN402 on the main board.

6.

Disconnect the wires from the two connectors
CN607 and CN608 on the CD & MCU board.

7.

Remove the four screws F and the two screws G
retaining the bracket of the CD mechanism
assembly from the left and right.

8.

Remove the screw H retaining the front panel
assembly from the bottom side of the main body.

9.

While opening the hooks d to the left and right of
the lower part of the front panel assembly (in the
direction of arrows 1), slide the front panel
assembly toward the front (in the direction of arrow

2).

Lift the rear
part to remove.

D

CD mechanism
assembly

CN402

F

Fig.7

Fig.8

(To be loosened)

D

Rear panel

CN201

CN608

Top cover

F

G
E

Ear phone
board

Tie band

[Note] After assembly, apply a locking agent to
the screws F and G.

CD mechanism
assembly

F

G

CN607

Connector on the
cassette switch
board

Chassis

Power board

Fig.9

Hook d

Hook d

Fig.11Fig.10

CN902

1

Front panel assembly

2

H

1

1-7

UX-M3R

Removing the CD mechanism

assembly (See Figs. 12 to 14.)

Remove the left and right side panels.
Remove the top cover.
Remove the front panel assembly.

1.

Disconnect the wires from the four connectors
CN601, CN602, CN603 and CN701 on the CD &
MCU board.

2.

From the left side of the main body, remove the tie
band bundling the wires.

3.

Loosen the screw J retaining the main board.

4.

From the left and right sides of the main body,
remove the four screws K retaining the bracket.

5.

Slide the CD mechanism assembly toward the front
and remove it from the studs of the main board.

CD & MCU board

K

CN701

CN603

CD mechanism assembly

CD & MCU board

CN601

CN602

Fig.12

J

Tie band

Fig.13

CD & MCU board

K

Stud

Main board

1-8

Fig.14

UX-M3R

Removing the power board

(See Figs. 15 and 16.)

Remove the left and right side panels.

1.

Disconnect the wire from the connector CN901 on
the power board.

2.

Remove the two screws L retaining the chassis .

3.

Remove the power board by pinching the two studs
retaining the board using radio pliers, etc.

Power transformer

Chassis

Power board

Stud

CN901

L

Fig.15

Stud

Main board

Power board

Radio pliers, etc.

Stud

Removing the main board

(See Figs. 17 and 18.)

Remove the left and right side panels.
Remove the top cover.
Remove the front panel assembly.
Remove the CD mechanism assembly.

1.

Remove the two screws M retaining the speaker
terminal of the main board.

2.

From the top side of the main body, remove the
screw N retaining the heat sink of the main board.

3.

Remove the solder from the soldered part e that
attaches the FM antenna wire to the main board.

4.

Slide the main board toward the front to remove it
from the chassis.

[Note] After assembly, apply a locking agent to
the screw N.

M

Soldered part e

FM antenna wire

N

Chassis

Fig.16

Fig.17

Heat sink

Chassis

Rear panel

Speaker terminal

Main board

Power transformer

Fig.18

1-9