JVC THV70R - Service Manual Immediate Download

SERVICE MANUAL

No.21175

2003/02

TH-V70R

DVD DIGITAL CINEMA SYSTEM

21175

2003

TH-V70R

TABLE OF CONTENTS

Important Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Disassembly method . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

Adjustment method. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

Description of major ICs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-26

Area suffix

EE --------- Russian Federation

SP-XSV70

SP-XCV70

SP-XSV70

D V D

D I G I T A L

C I N E M A

SYS T E M

T H - V

70 R

RMÐSTHV70R

DVD CINEMA SYSTEM

CHANNEL

VOLUME

TV VOL

TUNING

STOP

DIMMER

PAUSE

FF/

/REW

TV/VIDEO

MUTING

REC

PLAY

DOWN

MEMORY

STROBE

DVD

VCR 1

AUDIO

AUX

ANGLE

FM/AM

SUBTITLE

DECODE

RETURN

DIGEST

ZOOM

VFP

TOP MENU

ZOOM

CONTROL

ÐSUBWOOFER +

EFFECT

Ð CENTER +

REAR-R

TEST

SLEEP

VCR

SETTING

TV RETURN

ENTER

SCREEN

CHOICE

DVD

SURROUND

MODE

FM MODE

+10

100+

RDS

AUDIO

VCR

REAR-L

SOUND

RDS DISPLAY

PTY SEARCH

TA/NEWS/INFO

PTY

SP-PWV70

XV-THV70R

TH-V70R

1-2 (No.21175)

SECTION 1

Important Safety Precautions

1.1 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 man-

ufacturer. 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 Service Manu-

al. Electrical components having such features are iden-

tified by shading on the schematics and by ( ) on the

Parts List in the Service Manual. The use of a substitute re-

placement which does not have the same safety character-

istics as the recommended replacement parts shown in the

Parts List of Service Manual may create shock, fire, or oth-

er 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 reassembling.

(5) Leakage shock hazard testing)

After reassembling 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, 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, 1,000 ohms per volt or more sensitivity in

the following manner. Connect a 1,500 ohm 10W resistor

paralleled by a 0.15 µF 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. 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. (Except the JC version)

TH-V70R

(No.21175)1-3

1.5 Safety Precautions (U.K only)

(1) This design of this product contains special hardware and many circuits and components specially for safety purposes. For con-

tinued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replace-

ment parts must be identical to those used in the original circuits.

(2) Any unauthorised design alterations or additions will void the manufacturer's guarantee; furthermore the manufacturer cannot

accept responsibility for personal injury or property damage resulting therefrom.

(3) Essential safety critical components are identified by (

) on the Parts List and by shading on the schematics, and must never

be replaced by parts other than those listed in the manual. Please note however that many electrical and mechanical parts in

the product have special safety related characteristics. These characteristics are often not evident from visual inspection. Parts

other than specified by the manufacturer may not have the same safety characteristics as the recommended replacement parts

shown in the Parts List of the Service Manual and 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.

1.5.1 Warning

(1) Service should be performed by qualified personnel only.

(2) This equipment has been designed and manufactured to meet international safety standards.

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

(4) Repairs must be made in accordance with the relevant safety standards.

(5) It is essential that safety critical components are replaced by approved parts.

(6) 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.

TH-V70R

1-4 (No.21175)

1.6 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.

1.6.1

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) 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.

1.7 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 replace-

ment 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.

1.8 Attention when traverse unit is decomposed

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

· Apply solder to the short land sections before the flexible wire is disconnected from the connector CN101 on the DVD servo board.

(If the flexible wire is disconnected without applying solder, the DVD 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.

Short lands

DVD servo board

Flexible wire

CN202

CN201

DVD mechanism assembly

Connector

TH-V70R

(No.21175)1-5

1.9 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.

CAUTION

Please use enough caution not to see the beam directly

or touch it in case of anadjustment 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 näkymät-

tömälle lasersäteilylle. Älä katso säteeseen.

ADVARSEL

Usynlig laserstråling ved åbning, når sikkerhedsafbrydere er

ude af funktion. Undgå udsasttelse for stråling.

ADVARSEL

Usynlig laserstråling ved åpning, når sikkerhetsbryteren er avs-

lott. unngå utsettelse for stråling.

REPRODUCTION AND POSITION OF LABELS

WARNING LABEL

CLASS 1

LASER PRODUCT

ADVARSEL: Usynlig laser-

stråling ved åbning, når

sikkerhedsafbrydere er ude

af funktion. Undgåudsæt-

telse for stråling.

(d)

VARNING: Osynlig laser-

strålning när denna del är

öppnad och spärren är

urkopplad. Betrakta ej

strålen.

(s)

CAUTION: Invisible laser

radiation when open and

interlock failed or defeated.

AVOID DIRECT EXPOSURE

TO BEAM.

(e)

VARO: Avattaessa

suojalukitus

ohitettaessa

oleta lttiina näkymättö-

mälle lasersäteilylle.

Älä katso säteeseen. (f)

CLASS 1

LASER PRODUCT