JVC AV273205 - Service Manual Immediate Download

No.51937

May. 2002

AV-27320

AV-27330

AV-27S33

May 2002

AV-27320/S/R

AV-27330/S/R

AV-27S33/S/R

CONTENTS

SPECIFICATIONS

! SAFETY PRECAUTIONS

! FEATURES

HOW TO IDENTIFY MODELS

! MAIN DIFFERENCE LIST

FUNCTIONS

SPECIFIC SERVICE INSTRUCTIONS

! SERVICE ADJUSTMENTS

PARTS LIST

OPERATING INSTRUCTIONS

STANDARD CIRCUIT DIAGRAM

2-1

SERVICE MANUAL

COLOR TELEVISION

BASIC CHASSIS

[RM-C255]

AV-27330

AV-27S33

[RM-C205]

AV-27320

No.51937

AV-27320

AV-27330

AV-27S33

SPECIFICATIONS

Contents

Items

AV-27320/S

AV-27320/R

AV-27330/S

AV-27330/R

AV-27S33/S

AV-27S33/R

Dimensions (W×

H×

25-3/4"×23"-3/8"×19-1/2" (654mm×593mm×494mm)

Mass

68.5 Ibs (31.1 kg)

TV System and Color System

TV RF System

Color System

Sound System

CCIR(M)

NTSC

BTSC System (Multi-Channel Sound)

TV Receiving Channels and Frequency

VL Band

VH Band

UHF Band

(0206) 54MHz88MHz

(0713) 174MHz216MHz

(1469) 470MHz806MHz

CATV Receiving Channels and Frequency

Low Band

High Band

Mid Band

Super Band

Hyper Band

Ultra Band

Sub Mid Band

TV/CATV Total Channel

(0206, A-8) by (0206&01)

(0713) by (0713)

(A1) by (1422)

(JW) by (2336)

(W +1W+28) by (3764)

(W +29W+84) by (65125)

(A8, A4A1) by (01, 9699)

181 Channels

Intermediate Frequency

Video IF Carrier

Sound IF Carrier

Color Sub Carrier

45.75MHz

41.25MHz (4.5MHz)

3.58MHz

Power Input

Power Consumption

120V AC, 60Hz

113W

Picture Tube

High Voltage

27" (68cm) Measured Diagonally

28.0kV±1.3kV (at zero beam current)

Speaker

Au dio Power Output

2"×3-1/2" (5×9cm) Oval type×2

1.2W + 1.2W

Input terminals

Input 1

S-Video

Video(V)

Comp onent (V/Y, PB, PR)

Au dio (L, R)

Y: 1Vp-p Positive (negative s ync provided, when terminated with 75)

C: 0.286Vp-p (burst signal, when terminated with 75)

1Vp-p, 75 (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]

1Vp-p 75(pos itive sync) [AV-27320/S,R]

500mVrms ( -4dBs ), High Impedanc e (RCA pin jack)

Input 2

Video(V)

Au dio (L, R)

Component (V/Y, PB, PR)

Audio(L, R)

1Vp-p, 75 (RCA pin jack) [AV-27320/S,R]

500mVrms ( -4dBs ), High Impedanc e (RCA pin jack) [AV-27320/S,R]

1Vp-p 75(pos itive sync) [AV-27330/S,R AV-27S33/S,R]

500mVrms ( -4dBs ), High Impedanc e (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]

Input 3

(Front)

Video(V)

Au dio (L, R)

1Vp-p, 75 (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]

500mVrms ( -4dBs ), High Impedanc e (RCA pin jack) [AV-27330/S,R AV-27S33/S,R]

Output terminals

Variable Audio Output (R/L)

More than 0 1550mVrms (+6dBs)

Low impedanc e (400Hz when modulated 100%) (RCA pin jack)

An ten na terminal

75(VHF/UHF) Terminal, F-T ype Connector

Remote Control Unit

RM-C205 (AA/R6/UM-3 battery×2) [AV-27320/S,R]

RM-C255 (AA/R6/UM-3 battery×2) [AV-27330/S,R AV-27S33/S,R]

Design & specifications are subject to change without notice.

(54MHz804MHz)

No. 51937

AV-27320

AV-27330

AV-27S33

SAFETY PRECAUTIONS

1. The design of this product c ontains spec ial hardware, many

circuits and components s pecially for safety purposes. For

continued protection, no changes should be made to the

original des ign unless authorized in writing by the manufacturer.

Replacement parts must be identic al to thos e used in the

original circuits. Servic e should be performed by qualified

pers onnel only.

2. Alterations of the design or circuitry of the products s hould not

be made. Any design alterations or additions will void the

manufacturer's

warranty

and

will

further

relieve

the

manufacturer of respons ibility for pers onal injury or property

damage resulting therefrom.

3. Many electrical and mechanic al parts in the products have

special safety-related c haracteris tics. These charac teristics are

often not evident from visual inspection nor can the protection

afforded by

them necess arily

be obtained by

using

replac ement components rated for higher voltage, wattage, etc.

Replacement parts

whic h have thes e special

s afety

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 replac ement which

does not have the same safety characteristics as the

recommended replac ement part shown in the parts list of

Service manual may c aus e shock, fire, or other haz ards.

4. Use isolation transformer when hot chassis.

The chassis and any sub-chassis contained in s ome products

are c onnected 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. Do n't short between the LIVE side ground and ISOLATED

(NEUTRAL) side ground or EARTH side ground when

repairing.

Some model's power c ircuit is partly different in the GND. The

differenc e of the GND is shown by the LIVE : (") s ide 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 meas uring apparatus (oscilloscope etc.)

the LIVE side GND and ISOLATED(NEUTRAL) side GND or

EARTH side GND at the s ame time.

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

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

that the B1 setting should be chec ked 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 damage, therefore operation under excess ive high

voltage c onditions should be kept to a minimum, or should be

prevented. If severe arc ing occurs, remove the AC power

immediately and determine the cause by visual inspection

(incorrect installation, crac ked or melted high voltage harness,

poor s oldering, etc.). T o 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 c hec k high voltage by drawing an arc. Us e a high

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

the picture tube before attempting meter connection, by

connec ting a clip lead to the ground frame and connecting the

other end of the lead through a 10k 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 dres s

in the high voltage c ircuit area. W here a short circuit has

occurred, those c omponents that indic ate evidence of

overheating

s hould

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 c abinet (antenna

terminals, video/audio input and output terminals, Control

knobs, metal c abinet, screwheads, earphone jac k, c ontrol

shafts, etc.) to be sure the product is safe to operate without

danger of electrical shoc k.

(1) Dielectric Strength Test

The is olation between the AC primary circuit and all metal parts

exposed to the us er, 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 sec ond.

(. . . . Withs tand a voltage of 1100V AC (r.m.s.) to an appliance

rated up to 120V, and 3000V AC (r.m.s.) to an applianc e 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 c ord directly into the AC outlet (do not use a

line is olation transformer during this check.). Using a "Leakage

Current Tester", measure the leakage current from each

exposed metal part of the cabinet, partic ularly 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 exc eed 0.2mA AC

(r.m.s.).

Alternate Check Method

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

line isolation transformer during this check.). Use an AC

voltmeter having 1000 ohms per volt or more sensitivity in the

following manner. Connec t a 1500 10W resistor paralleled

by a 0.15 F AC-type capacitor between an exposed metal

part and a known good earth ground (water pipe, etc.).

Measure the AC voltage across the resistor with the AC

voltmeter. Move the res istor 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, revers e 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 tropic al area, this must not exceed 0.3V AC

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

0.15F AC-TYPE

1500 10W

GOOD

EARTH

GR OUND

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

AC VOLTMETER

(HAVING 1000 /V,

OR MOR E SENSITIVITY)

11. High voltage hold down circuit check.

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

shall be c hec ked to operate correctly.

See item "Ho w to check the high voltage hold down

circuit".

This mark shows a fast

operating fuse, the

letters indicated below

show the rating.

No.51937

AV-27320

AV-27330

AV-27S33

FEATURES

" New chassis design enables use of a single board with simplified

circuitry.

" Users can make fun to connect the Digital Video Disk player with

the component video signal input terminal.

" Provided with miniature tuner (TV/CATV).

" Multifunctional remote controlpermits picture adjustment.

" Adoption of the CHANNEL GUARD function prevents the specific

channels from being selected, unless the "ID number" is key in.

" I2C bus control utilizes single chip ICs.

" Adoption of the VIDEO STATUS function.

" Adoption of the ON/OFF TIMER function.

" Built-in V-CHIP system.

" With 75V/U in common (F-Type) ANT Terminal.

" SLEEP TIMERfor setting in realtime.

" Closed-caption broadcasts can be viewed.

" Built-in MTS system.

" Built-in HYPER-SURROUND system.

" S-VIDEO input terminal for taking best advantage of Super VHS.

" Variable Audio output terminal.

" 3 LINE Digital Comb filter Improved picture quality.

HOW TO IDENTIFY MODELS

The differenc e between AV-27320/S and AV-27320/R is in the PICTURE TUBE.

As the result of the difference in picture tube, the MAIN PW B also differs.

In the same way, the difference between 27330/S and AV-27330/R,27S33/S and 27S33/R is in the PICTURE TUBE too.

MODEL

Parts name

AV-27320/S

AV-27330/S

AV-27S33/S

AV-27320/R

AV-27330/R

AV-27S33/R

RATING LABEL

LC31139-001A-A

Indicated AV-27230

or AV-27330

or AV-27S33

Indicated AV-27230

or AV-27330

or AV-27S33

Indic ated "S"

Indic ated "R"

No.51937

AV-27320

AV-27330

AV-27S33

MAIN DIFFERENCE LIST

Model name

Parts Name

AV-27320/S

AV-27320/R

MAIN PWB

SFE-1006A-M2

SFE-1007A-M2

ITC TUBE

A68QDN891X001

A68ADT25X01

POW ER KNOB

LC30376-001A-A

PUSH KNOB

LC30271-001A-A

REAR COVER

LC10082-004A-A

FRONT CABINET

LC10081-005B-A

JVC MARK

CM48006-006-C

REMOTE CONTROL UNIT

RM-C205-1C

Model name

Parts Name

AV-27330/S

AV-27330/R

MAIN PWB

SFE-1004A-M2

SFE-1005A-M2

ITC TUBE

A68QDN891X001

A68ADT25X01

POW ER KNOB

LC30376-001A-A

PUSH KNOB

LC30271-001A-A

REAR COVER

LC10082-003A-A

FRONT CABINET

LC10081-004B-A

JVC MARK

CM48006-006-C

REMOTE CONTROL UNIT

RM-C255-1H

Model name

Parts Name

AV-27S33/S

AV-27S33/R

MAIN PWB

SFE-1004A-M2

SFE-1005A-M2

ITC TUBE

A68QDN891X001

A68ADT25X01

POW ER KNOB

LC30376-004A-A

PUSH KNOB

LC30271-004A-A

REAR COVER

LC10082-003A-A

FRONT CABINET

LC10081-008A-A

JVC MARK

CM48006-007-C

REMOTE CONTROL UNIT

RM-C255-1H