JVC AV36D302/AH - Service Manual Immediate Download

SERVICE MANUAL

AV-36D202

AV-36D302

AV-36D502

COLOR TELEVISION

BASIC CHASSIS

No. 51798B

Oct. 2001

RM-C303G

[AV-36D202]

[AV-36D302]

RM-C301G

[AV-36D502]

AV-36D202 /AH AV-36D302 /AH AV-36D502 /AH

AV-36D202 /AR AV-36D302 /AR AV-36D502 /AR

AV-36D202 /AY AV-36D302 /AY AV-36D502 /AY

CONTENTS

a SAFETY PRECAUTIONS

AV-36D202 /AM AV-36D302 /AM AV-36D502 /AM

PRELIMINARY

¤ STANDARD CIRCUIT DIAGRAM (APPENDED)

a SERVICE ADJUSTMENTS

¤ OPERATING INSTRUCTIONS (APPENDED)

No. 51798B

AV-36D202

AV-36D302

AV-36D502

SAFETY PRECAUTIONS

1. The design of this product contains special hardware, many circuits

and components specially for safety purposes. For continued pro-

tection, 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. Service should be

performed by qualified personnel only.

2. Alterations of the design or circuitry of the products should not be

made. Any design alterations or additions will void the manufactur-

er's warranty and will further relieve the manufacturer of responsi-

bility 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 Service manual. The use of a substitute replacement

which does not have the same safety characteristics as the recom-

mended replacement part shown in the parts list of Service manual

may cause shock, fire, or other hazards.

4. Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in some products are

connected to one side of the AC power line. An isolation transformer

of adequate capacity should be inserted between the product and

the AC power supply point while performing any service on some

products when the HOT chassis is exposed.

5. Don't short between the LIVE side ground and ISOLATED (NEU-

TRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The dif-

ference of the GND is shown by the LIVE : (

) side GND, the

ISOLATED(NEUTRAL) : (

) side GND and EARTH : (

) side

GND. Don't short between the LIVE side GND and

ISOLATED(NEUTRAL) side GND or EARTH side GND and never

measure with a measuring apparatus (oscilloscope etc.) the LIVE

side GND and ISOLATED(NEUTRAL) side GND or EARTH side

GND at the same time.

If above note will not be kept, a fuse or any parts will be broken.

6. If any repair has been made to the chassis, it is recommended that

the B1 setting should be checked or adjusted (See ADJUSTMENT

OF B1 POWER SUPPLY).

7. The high voltage applied to the picture tube must conform with that

specified in Service manual. Excessive high voltage can cause an

increase in X-Ray emission, arcing and possible component dam-

age, therefore operation under excessive high voltage conditions

should be kept to a minimum, or should be prevented. If severe

arcing occurs, remove the AC power immediately and determine

the cause by visual inspection (incorrect installation, cracked or

melted high voltage harness, poor soldering, etc.). To maintain the

proper minimum level of soft X-Ray emission, components in the

high voltage circuitry including the picture tube must be the exact

replacements or alternatives approved by the manufacturer of the

complete product.

8. Do not check high voltage by drawing an arc. Use a high voltage

meter or a high voltage probe with a VTVM. Discharge the picture

tube before attempting meter connection, by connecting a clip lead

to the ground frame and connecting the other end of the lead through

a 10kØ 2W resistor to the anode button.

9. When service is required, observe the original lead dress. Extra

precaution should be given to assure correct lead dress in the high

voltage circuit area. Where a short circuit has occurred, those com-

ponents that indicate evidence of overheating should be replaced.

Always use the manufacturer's replacement components.

10. Isolation Check

(Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation check

on the exposed metal parts of the cabinet (antenna terminals, video/

audio input and output terminals, Control knobs, metal cabinet,

screwheads, earphone jack, control shafts, etc.) to be sure the prod-

uct is safe to operate without danger of electrical shock.

(1) Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts

exposed to the user, particularly any exposed metal part having a

return path to the chassis should withstand a voltage of 1100V AC

(r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rated

up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or

more, for a period of one second.)

This method of test requires a test equipment not generally found in

the service trade.

(2) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line

isolation transformer during this check.). Using a "Leakage Current

Tester", measure the leakage current from each exposed metal part

of the cabinet, particularly any exposed metal part having a return

path to the chassis, to a known good earth ground (water pipe, etc.).

Any leakage current must not exceed 0.5mA AC (r.m.s.).

However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).

· Alternate Check Method

Plug the AC line cord directly into the AC outlet (do not use a line

isolation transformer during this check.). Use an AC voltmeter hav-

ing 1000 ohms per volt or more sensitivity in the following manner.

Connect a 1500Ø 10W resistor paralleled by a 0.15µF AC-type ca-

pacitor between an exposed metal part and a known good earth

ground (water pipe, etc.). Measure the AC voltage across the resis-

tor with the AC voltmeter. Move the resistor connection to each ex-

posed metal part, particularly any exposed metal part having a re-

turn 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 0.75V AC

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

However, in tropical area, this must not exceed 0.3V AC (r.m.s.).

This corresponds to 0.2mA AC (r.m.s.).

11. High voltage hold down circuit check.

After repair of the high voltage hold down circuit, this circuit shall be

checked to operate correctly.

See item "How to check the high voltage hold down circuit".

GOOD

EARTH

GROUND

0.15

µF AC-TYPE

AC VOLTMETER

(HAVING 1000Ø/V,

OR MORE SENSITIVITY)

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

1500Ø 10W

This mark shows a fast

POWER CORD

REPLACEMENT WARNING

Connecting thr white line side of

power cord to "WHT" character side.

operating fuse, the

letters indicated below

show the rating.

PWB

WHT

White line side

No. 51798B

AV-36D202

AV-36D302

AV-36D502

SERVICE ADJUSTMENTS

ADJUSTMENT STEP

PIP VCO [ADDITION : AV-36D502 only]

Item

Measuring

instrument

Test point

Adjustment part

Description

PIP VCO

adjustment

PIP VCO transf.

(T111)

[PIP]

1. Set the PIP mode.

2. Receive the ordinary broadcast signal.

3. Select "TU2 VCO" of the SERVICE MENU.

4. Confirm [SYNC] to "YES".

5. Turn the PIP VCO transformer to where "REFERENCE LEVEL"

characters are yellow.

When finished, confirm [SYNC] to "YES" again.

FOCUS [CHANGE]

Item

Measuring

instrument

Test point

Adjustment part

Description

FOCUS

adjustment

Signal

generator

FOCUS VR

[HVT]

! Set the VIDEO STATUS to "STANDARD".

! When makes difference by FOCUS adjustment, should be

recommending CONVERGENCE and PURITY adjustments.

1. Receive a crosshatch signal.

2. White looking at the screen center, adjust the FOCUS VR so that

be clear and in fine detail.

3. Make sure that the picture is in focus even when the screen gets

darkness.

V POSITION & V SIZE [CHANGE]

Item

Measuring

instrument

Test point

Adjustment part

Description

V POSITION &

V SIZE

adjustment

Signal

generator

V CENTER SW

(S421)

No.71 : V POSI

No.66 : V SIZE

No.78 : TRAPEZ

No.65 : V LIN

1. Receive a crosshatch signal.

2. Set the No.71: V POSI to "0".

3. Adjust the V CENTER SW and No.66: V SIZE to the vertical size

is 92%.

4. Confirm the vertical lines to be straight. If it is not straight, adjust

to be straight at the No.78: TRAPEZ.

5. Confirm upper and lower of the screen. If it is not symmetrical,

adjust to be symmetrical at the No.65: V LIN.

SUB COLOR [CHANGE]

SUB TINT [CHANGE]

Model

A [VW-B]

Model

B [VW-B]

AV-36D202/AY, AV-36D302/AY, AV-36D502/AY

+12V

AV-36D202/AY, AV-36D302/AY, AV-36D502/AY

+14V

AV-36D202/AR, AV-36D302/AR, AV-36D502/AR

+14V

AV-36D202/AR, AV-36D302/AR, AV-36D502/AR

+18V

AV-36D202/AH, AV-36D302/AH, AV-36D502/AH

+10V

AV-36D202/AH, AV-36D302/AH, AV-36D502/AH

+16V

AV-36D202/AM, AV-36D302/AM, AV-36D502/AM

+9V

AV-36D202/AM, AV-36D302/AM, AV-36D502/AM

+9V

TU2 VCO

HIGH LEVEL

REFERENCE LEVEL

LOW LEVEL

SYNC

YES

PIP SCREEN

These models (with A mark) were changed chassis from AV-36D202 / AV-36D302 / AV-36D502 (AC chassis).

This content describes only items which differ from those of the base models SERVICE MANUAL.

Please refer to the AV-36D202 / AV-36D302 / AV-36D502 SERVICE MANUAL (No.51798 issued Mar. 2001).

Printed in Japan

0110

H.K/Y.S/A.N

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

Head office :

1700 Valley Road, Wayne, New Jersey 07470

(973)317-5000

East Coast :

10 New Maple Avenue, Pine Brook, New Jersey 07058

(973)396-1000

Midwest

705 Enterprise St. Aurora, Illinois 60504

(630)851-7855

West Coast :

5665 Corporate Avenue, Cypress, California 90630

(714)229-8011

Southwest :

10700 Hammerly, Suite 105, Houston,Texas 77043

(713)935-9331

Hawaii

2969 Mapunapuna Place, Honolulu, Hawaii 96819

(808)833-5828

Southeast :

1500 Lakes Parkway, Lawrenceville, Georgia 30243

(770)339-2582

JVC CANADA INC.

Head office :

21 Finchdene Square Scarborough, Ontario M1X 1A7

(416)293-1311

Vancouver :

13040 Worster Court Richmond B.C. V6V 2B3

(604)270-1311

SERVICE MANUAL

AV-36D202

AV-36D302

AV-36D502

COLOR TELEVISION

BASIC CHASSIS

No. 51798

Mar. 2001

RM-C303G

[AV-36D202]

[AV-36D302]

RM-C301G

[AV-36D502]

AV-36D202 /H AV-36D302 /H AV-36D502 /H

AV-36D202 /R AV-36D302 /R AV-36D502 /R

AV-36D202 /Y AV-36D302 /Y AV-36D502 /Y

CONTENTS

a SPECIFICATIONS ....................................................................................................................................2

a SAFETY PRECAUTIONS ........................................................................................................................3

a FEATURES ..............................................................................................................................................4

a MAIN DIFFERENCE LIST ........................................................................................................................5

a HOW TO IDENTIFY MODELS ..................................................................................................................5

a FUNCTIONS .............................................................................................................................................7

a SPECIFIC SERVICE INSTRUCTIONS ....................................................................................................8

a SERVICE ADJUSTMENTS ....................................................................................................................14

¤ STANDARD CIRCUIT DIAGRAM (APPENDIX) .................................................................................. 2-1

a PARTS LIST ...........................................................................................................................................37