JVC UXP38V - Service Manual Immediate Download

UX-P38V

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SERVICE MANUAL

MICRO COMPONENT SYSTEM

No.20965

Sep. 2001

2001 VICTOR COMPANY OF JAPAN, LTD.

UX-P38V

Contents

Safety precautions

Important for laser products

Preventing static electricity

Disassembly method

Adjustment method

Flow of functional operation

until TOC read

Maintenance of laser pickup

Replacement of laser pickup

Description of major ICs

1-2

1-3

1-4

1-5

1-15

1-19

1-20

1-21~32

Area Suffix

Singapore

Asean

Hong Kong

SP-UXP38V

CA-UXP38V

SP-UXP38V

UX-P38V

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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 current 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 measure the AC voltage across the resistor.

Now, reverse the plug in the AC outlet and repeat each

measurement. Any voltage measured must not exceed 0.75 V

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

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

Burrs formed during molding may

be left over on some parts of the

chassis. Therefore, pay attention to

such burrs in the case of

performing 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.

When replacing them, be sure to use the parts of the same type and rating as specified by the manufacturer.

(Except the JC version)

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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 defeated. 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

! CAUTION Please use enough caution not to

see the beam directly or touch it

in case of an adjustment or operation

check.

CLASS

LASER

PRODUCT

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)

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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.

1.1. Grounding to prevent damage by static electricity

Static electricity in the work area can destroy the optical pickup (laser diode) in devices such as DVD players.

Be careful to use proper grounding in the area where repairs are being performed.

1.1.1. Ground the workbench

1. 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.

1.1.2. Ground yourself

1. Use an anti-static wrist strap to release any static electricity built up in your body.

1.1.3. 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.

1.2. 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

Soldering

Position

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Disassembly method

Removing the rear cover (See Fig. 1 & 2)

1. Remove the two screws A attaching the top of rear

(heatsink) cover at the back of the body.

2. The (heatsink) cover now can be swing downwards

to a horizontal position and detached.

Removing the metal cover (See Fig. 3~5)

Prior to performing the following procedure, remove

the rear cover.

1. Remove the six screws B attaching the metal cover

to the back panel.

2. Remove the 2 screws C from each side of the metal

cover.

3. Holding the bottom edges on the rear of the metal

cover, pull apart and swing the cover upwards. It can

be detached by pulling upwards.

Fig. 1

Fig. 5

Rear cover

Fig. 2

Rear cover

Fig. 4

Side panel (R)

Side panel (L)

Fig. 3

Metal cover

Rear panel