JVC AVT2122/AR - Service Manual Immediate Download

No.51866

Aug.2001

AV-T2122

Sept. 2001

AV-T2122/AR

CONTENTS

! SPECIFICATIONS

! SAFETY PRECAUTIONS

! FEATURES

! FUNCTIONS

! SPECIFIC SERVICE INSTRUCTIONS

! SERVICE ADJUSTMENTS

! PARTS LIST

OPERATING INSTRUCTIONS

STANDARD CIRCUIT DIAGRAM (APPENDIX)

2-1

SERVICE MANUAL

COLOR TELEVISION

BASIC CHASSIS

GA2

No.51866

AV-T2122

SPECIFICATIONS

Items

Contents

Dimensions (W×

×H×

×D)

61.9cm×45.8cm×48.7cm

Mass

22.0kg

TV RF System

CCIR (M)&(N)

Color/ Sound System

NTSC-M / PAL-M / PAL-N

MTS (Multi Channel Sound)

TV Receiving Channels and Frequency

VL Band

VH Band

UHF Band

(0206) 55.25MHz83.25MHz

(0713) 175.25MHz211.25MHz

(1469) 471.25MHz801.25MHz

CATV Receiving Channels and Frequency

Low Band

High Band

Mid Band

Super Band

Hyper Band

Ultra Band

Sub Mid Band

(0206)

(0713)

(1422)

(2336)

(3764)

(6594, 100125)

(01, 9699)

TV/CATV Total Channel

181 Channels

Intermediate Frequency

Video IF Carrier

Sound IF Carrier

Color Sub Carrier

45.75MHz

41.25MHz (4.5MHz)

NTSC-M

: 3.579545MHz

PAL-M

: 3.57561149MHz

PAL-N

: 3.58205625MHz

Antenna terminal

75(VHF/UHF) Terminal, F-Type Connector

Power Input

Rated Voltage : 120V240V AC, 50Hz/60Hz

Operating Voltage : 90V260V AC, 50Hz/60Hz

Power Consumption

87W(max.) / 63W(Avg.)

Picture Tube

Visible size: 51 cm measured diagonally

High Voltage (at zero been current)

26.5kV±1.0kV

Speaker

6×12cm oval type×2

Audio Power Output

1.5W1.5W (Stereo)

Input

Video input

Audio input

(Front / Rear)

1Vp-p 75 (RCA pin jack)

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

Variable Audio Output

More then 01550mVrms (+6dBs)

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

Headphone Jack / Earphone Jack

3.5mm stereo

mini jack (Headphone Jack)

Remote Control Unit

RM-C373 (AA/R6/UM-3 battery×2)

Design & specification are subject to change without notice.

(55.25MHz799.25MHz)

No.51866

AV-T2122

SAFETY PRECAUTIONS

The design of this product contains special hardware, 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. Service should be performed by qualified personnel

only.

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

made. Any design alterations or additions will void the

manufacturer's warranty and will further relieve the manufacturer

of responsibility for personal injury or property damage resulting

therefrom.

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 recommended

replacement part shown in the parts list of Service manual may

cause shock, fire, or other hazards.

Don't short between the LIVE side ground and ISOLATED

(NEUTRAL) side ground or EARTH side ground when

repairing.

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

difference 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.

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).

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 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.

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 10k

" 2W resistor to the anode button.

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 components that indicate evidence of overheating should

be replaced. Always use the manufacturer's replacement

components.

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 product 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 3000V

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

having 1000 ohms per volt or more sensitivity in the following

manner. Connect 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 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 0.75V 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.).

0.15F AC-TYPE

1500 " 10W

GOOD EARTH GROUND

PLACE THIS PROBE

ON EACH EXPOSED

METAL PART

AC VOLTMETER

(HAVING 1000 "/V,

OR MORE SENSITIVITY)

No. 51866

AV-T2122

FEATURES

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

circuitry.

" Provided with miniature tuner (TV/CATV).

" PLL synthesizer system TV/CATV totaling 181 channels.

" Multifunctional remote control permits picture adjustment.

" With AUDIO. VIDEO INPUT terminal.

" Adoption of the VIDEO STATUS function.

" Adoption of the ON/OFF TIMER function.

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

" SLEEP TIMER for setting in real time.

" Wide range voltage (90V260V) AC power input.

" Variable audio output terminal.

FUNCTIONS

Front control

VOLUME - Buttom

VOLUME + Buttom

ECO sensor

Remote control sensor

ON TIMER lamp

POWER lamp

MAIN POWER SW Button

HEADPHONE JACK Teminal

VIDEO INPUT Teminal

AUDIO L INPUT Teminal

AUDIO R INPUT Teminal

MENU Button

CHANNEL Button

No. 51866

AV-T2122

Rear terminal

Remote control unit (RM-C373)

ANT Terminal

VIDEO INPUT Terminal

AUDIO L INPUT Terminal

AUDIO R INPUT Terminal

VIDEO OUTPUT Terminal

AUDIO L OUTPUT Terminal

AUDIO R OUTPUT Terminal

TV / VIDEO key

DISPLAY key

PICTURE BOOSTER key

CLOSED CAPTION key

SLEEP TIMER key

VIDEO STATUS key

COLOUR SYSTEM key

EXIT key

MENU (/& +/-)key

RETURN+ key

CHANNEL key

POWER key

Number (CH.) key

- /- - key

HYPER SURROUND key

MUTING key

VOLUME key