JVC UX-H30 Manuale utente

SERVICE MANUAL

2003/8

MICRO COMPONENT SYSTEM

MB02420038UX-H30

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-21

MICRO COMPONENT SYSTEM

Area Suffix

U ---------------- Other Areas

UP ---------------------- Korea

UT --------------------- Taiwan

UW ---- Brazil,Mexico,Peru

1-2 (No.MB024)

SPECIFICATION

Amplifier Output Power 20 W (10 W + 10 W) at 4 Ω(10% THD)

Audio input sensitivity/Impedance (at 1 kHz) AUX 500 mV/48.75 kΩ

Speakers/Impedance 4 Ω

Tuner FM tuning range 87.50 MHz - 108.00 MHz

AM tuning range AM 10 kHz intervals 530 kHz - 1 710 kHz

AM 9 kHz intervals 531 kHz - 1 710 kHz

CD player Dynamic range 85 dB

Signal-to-noise ratio 90 dB

Wow and flutter Immeasurable

Cassette deck Frequency response Normal (type I) 50 Hz - 15 000 Hz

Wow and flutter 0.15% (WRMS)

Speaker Speaker units Full range 8.0 cm cone ×1

Impedance 4 Ω

Dimensions (approx.) 135 mm ×203 mm ×190 mm (W/H/D)

Mass (approx.) 1.7 kg each

General Power requirement AC IN 110 V/ 127 V/ 230 V ,

adjustable with the voltageselector,

50 Hz/ 60 Hz

DC IN 12 V, 4 A

Power consumption 35 W (at operation)

3.0 W (on standby)

Dimensions (approx.) 412 mm ×208 mm ×275 mm (W/H/D)

Mass (approx.) 6.5 kg

(No.MB024)1-3

SECTION 1

PRECAUTION

1.1 Safety Precautions

(1) This design of this product contains special hardware and

many circuits and components specially for safety purpos-

es. 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 per-

formed 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 manufacturers 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 characteris-

tics are often not evident from visual inspection nor can the

protection afforded by them necessarily be obtained by us-

ing replacement components rated for higher voltage, watt-

age, etc. Replacement parts which have these special

safety characteristics are identified in the Parts List of Ser-

vice 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 charac-

teristics 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 reassem-

bling.

(5) Leakage shock hazard testing

After reassembling the product, always perform an isola-

tion check on the exposed metal parts of the product (an-

tenna 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, particular-

ly any exposed metal part having a return path to the

chassis, to a known good earth ground. Any leakage cur-

rent 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, 1,000Ωper volt or more sensitivity

in the following manner. Connect a 1,500Ω10W resistor

paralleled by a 0.15µF AC-type capacitor between an ex-

posed 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 measure 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.).

1.2 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.

1.3 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 pre-

forming repair of this system.

1.4 Critical parts for safety

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. When replacing them, be sure to use the parts of the

same type and rating as specified by the manufacturer.

(This regulation dose not Except the J and C version)

Good earth ground

Place this

probe on

each expose

metal part.

AC VOLTMETER

(Having 1000

ohms/volts,

or more sensitivity)

1500 10W

0.15 F AC TYPE

1-4 (No.MB024)

1.5 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.

1.5.1 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.

1.6 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) I t is not possible to adjust the semi-fixed resistor that adjusts the laser power. Do not turn it.

1.7 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 sections before the flexible wire is disconnected from the connector CN601 on the CD servo board.

(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 sections after connecting the flexible wire.

Conductive material

(conductive sheet) or iron palate

(caption)

Anti-static wrist strap

CN601 on

mechanism

board

Shorting round

Flexible wire

(No.MB024)1-5

1.8 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 laser

radiation and is equipped with safety switches which

prevent 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.

REPRODUCTION AND POSITION OF LABEL and PRINT

WARNING LABEL and PRINT

!Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

Caution label

1-6 (No.MB024)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.MB024)1-7

SECTION 3

DISASSEMBLY

3.1 Main body

3.1.1 Removing the rear panel

(See Fig.1,2)

(1) From behind the body, remove the nine screws Aattach-

ing the rear panel.

(2) Turing the body upside down, remove the two screws Bat-

taching the rear panel, and remove.

3.1.2 Removning the side panel (L) and (R)

(See Fig.2~5)

• Prior to performing the following procedure, remove the rear

panel.

(1) Turning the body upside down, remove the two screws C

attaching the front panel assembly.

(2) Turning the body initial position, open the CD door while

pressing the upper OPEN button.

(3) Moving the side panel (L) in the arrow direction, remove the

panel from the left side of the body.

(4) Moving the side panel (R) in the arrow direction, remove

the panel from the right side of the body.

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Front panel assembly

Rear panel

Side panel (L)

Side panel (R)

1-8 (No.MB024)

3.1.3 Removing the CD player assembly

(See Fig.6,7)

• Prior to performing the following procedure, remove the rear

panel and the left and right side panels.

(1) Disconnect the card wires from the two connectors CN603

and CN604 on the CD servo control board.

(2) Remove the two screws Dattaching the front panel as-

sembly on the both sides.

(3) Release the two joints aon the both sides of the front pan-

el assembly.

(4) Move the CD player assembly in the direction of the arrow.

Fig.6

Fig.7

CD player assembly CD servo control board

CN604

aCN603

CD player assembly

(No.MB024)1-9

3.1.4 Removing the power amplifier board and heat sink

(See Fig.8~10)

• Prior to performing the following procedure, remove the rear

panel, the left and right side panels, and the CD player assem-

bly.

(1) Remove the five screws Eand Fattaching the heat sink.

(2) Disconnect the wire from connector CN901 on the power

supply board.

(3) Disconnect the card wire from connector CN305 on the

power amplifier board.

(4) Remove the screw Gattaching the power amplifier board.

(5) Disconnect the connector CN301 on the power amplifier

board, and release the two joints b.

REFERENCE:

Remove the screw F, then power amplifier board can be re-

moved without removing heat sink.

Fig.8

Fig.9

Fig.10

3.1.5 Removing the tuner board

(See Fig.11)

• Prior to performing the following procedure, remove the rear

panel, the left and right side panels, and the CD player assem-

bly.

(1) Remove the screw Hattaching the tuner board from the

right side of the body.

(2) Disconnect the card wire from the connector CN1 on the

tuner board.

(3) Release the joint c, and remove the tuner board backward.

Fig.11

Heat sink

Power amplifier board

CN301

Power supply board

CN901

CN305

Power amplifier board

Tuner board

CN1

1-10 (No.MB024)

3.1.6 Removing the front panel assembly

(See Fig.12,13)

• Prior to performing the following procedure, remove the rear

panel the left and right side panels, the CD player assembly,

the power amplifier board.

(1) Disconnect the card wire from the connector CN714 on the

LCD system CPU board.

(2) Release the joint don the bottom of the front panel as-

sembly using a screwdriver, and remove the front panel as-

sembly toward the front.

Fig.12

Fig.13

3.1.7 Remove the power transformer and power supply board

(See Fig.14,15)

• Prior to performing the following procedure, remove the rear

panel, the left and right side panels, the CD player assembly,

the power amplifier board and the tuner board.

(1) Remove the screw Iattaching the jack holder and release

joint e, and then remove jack holder.

(2) Remove the four screws Jattaching the power transformer

and power supply board.

Fig.14

Fig.15

LCD system CPU board

CN714

dFront panel assembly

Jack holder

Power transformer

Power supply board

Indice

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