JVC AV-T2922/AR Service Manual

SERVICE MANUAL

COLOR TELEVISION

AV-T2922

BASIC CHASSIS

GA

AV-T2922

/AR

CONTENTS

! SPECIFICATIONS ････････････････････････････････
!

SAFETY PRECAUT IONS

!

FEATURES････････････････････････････････

! FUNCTIONS ････････････････････････････････
!

SPECIFIC SERVICE INSTRUCTIONS

! SERVICE ADJUSTMENTS ････････････････････････････････

★ STAND ARD CIRCUIT DIAGRAM (APPENDIX) ････････････････････････････････

! PARTS LIST ････････････････････････････････

1

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COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

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･･･ 4

･･････

･･ 5

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･････ 2- 1

･･････････

3

6

No.519 17
Mar. 2002

A

V-T2922

)

SPECIFICATIONS

Items Content

Dimensions (W××××H××××D) 29-5/8 ×23-1/4 ×20 -5/8 / 75.2cm×59.0 cm×52.2 cm

Mass 90.9Ibs / 41.3kg

TV System and Color system

TV RF System CCIR(M), CCT R(N)

Color System PA L-M / P AL- N / NTSC

Sound System BTSC (M ulti Channel S ound)

Picture Tube 29 (74 cm ) m easur ed di agonally, Full S quare

Hi gh V ol ta ge 29 kV±1.3 kV (at zer o beam cur rent)

TV Receiving Frequency

VL B and (02～06) 55 .25 MHz～83.25MHz
VH Ba nd (07～13) 1 75. 25MHz～21 1.25MHz

UH F Ba nd (14～69 ) 471. 25MHz～80 1.25MHz

CAT V Receiving Frequency

Low Band (02 ～06)

Hi gh B and (07 ～13)

Mid Band (14 ～22)
Super Band (23 ～36)
Hyper Band (37 ～64)

Ul tra Ba n d (65 ～94, 10 0～125)

Sub Mid Band (01, 96～99)

Intermediate Frequency

Video IF Carrier

Sound IF Carrier 41.25M H z (4.5MHz)

Color Sub Carrier

PAL-M 3.57561149MHz

PAL-N 3.5 8205625MHz

NT S C 3.579545MHz

Power Input

Opera ting Voltage 90V～260V A C, 50Hz/ 60Hz

Rated Voltage

Power Consumption 115W(max.) , 85W (avg.)

PICTURE : 45.75MHz
CHROMA : 42.17MHz

120V～24 0V AC , 50Hz/60Hz

(55.25MHz～79 9.25MHz)

Speaker 2×4-3/4” / 5×12cm Oval type×2

Audio Power Output 5W+5W

Input / Output terminals

Input 1, 2 (V, L/R

Variable Audio Output

Antenna terminal 75Ω(VHF/ UHF) Termi nal, F-Type Connecto r

Remote control unit RM-C363-1H (AA/R03/UM-4 dry cell battery×2)

Video : 1Vp -p , 75 Ω (RCA pin jack)
Au dio : 50 0mVrms ( -4dBs), Hi gh Imp edance (RCA p in jack)

More then 0～1550mVrms (+6dBs )
Low Impedance ( 400 Hz w hen modulated 100%) (RCA pin j ack)

Design & specifications are subject t o change wit hout notice.

2

No.51917

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2

SAFETY PRECAUTIONS

V-T292

1. The d esign of th is pr od uct con tains special hardware , ma ny
circuit s and components specially for saf ety purposes. For
con tinu ed pr ot ection, n o changes shou ld be made to the o riginal
desi gn un less a uth or i zed in w riting by the manu facturer.

Replacement p ar ts must b e id ent ic al to thos e u sed in the origi n al
ci rcu it s. S er vic e sho uld be performed by qu al if ied pers on nel
only.

2. Alterations of t he desig n or cir cuitry of t he prod ucts sh ould not be
made. Any design alterations or additions will void the
manufact urer 's warr a nt y and will f urth er relieve t he ma nu factu r er
of resp onsibility for perso na l injur y or property dam ag e r esult ing
th erefr om.

3. Man y electr ical an d m ech anica l parts i n the prod ucts ha ve
special safety-related characteristics. These characteristics are
oft en no t e viden t f rom visua l i nspection n or can t he pr o tect io n
aff or de d by th em necessari ly be ob tain ed by using rep lac ement
com po ne nts rated for hig he r vol tag e, watt ag e, etc. Rep l acement
parts wh ic h have these speci al s afety ch aract erist ics are

identified in the parts list of Service m anual. El ectric al

components having such features are identifi ed by shading
on t he sche matic s and b y (!!!! ) on the parts list in Service
manual. The us e of a sub stitute r ep lacem en t whi ch does n ot

have the sam e saf ety ch ar act erist ics as the reco mmen de d
replac em ent par t sh own in the parts li st of Ser vice manual may

cause shock, fire, or other hazards.

4. Don't shor t between the LIVE side ground and ISOL ATED

(NE UTRAL) side ground or EARTH side ground when
repairing.

Some model's power circuit is partly different in the GND. The
diff erenc e of th e G ND is shown b y th e LIVE : (") side GND, the
ISO LATE D(NEUTRAL) : (#) side G ND and EAR TH : ($) side
GND. Do n't short bet ween th e LIVE sid e GND an d

ISO LATE D(NEUTRAL) side GND or EARTH side GND an d
never m ea sure wit h a m ea suring apparatus (oscil loscop e etc.)
th e LI VE sid e GN D and IS OLATED(NEUTRAL ) side G ND or
EARTH side GND at th e s ame time.
If above note will not be kept, a fuse or any parts will be broken.

5. If any repair has been made to the chassis, it is recommended
th at t he B1 setting should b e ch ecke d or adjusted (See
ADJUSTMENT OF B 1 POWE R SUPPL Y).

6. The hi gh voltage applie d t o th e pi cture tu be must con form w it h
th at speci fi ed i n S er vice manual. Excessive h igh voltage ca n

cau se an incr e ase in X-R ay emission , ar cing an d possible
component damage, therefore operation under excessive high
voltage conditions should be kept to a minimum, or should be
preve nt ed. If s ever e arc ing occurs, r em ove t he AC power

immed iate l y and determine the ca use by visua l insp ection
(incorrect in stallat ion, cr acke d or melted high vo lt age harness,
poor so ld ering, et c.). To maint ain the p r ope r minimu m level of
sof t X- Ray em i ssion, c omponents in the high voltag e cir cuitry
including the pict ur e tube must be t he e xact r ep lacem e nts or

alternat ives approve d b y th e ma nuf act urer of th e c omplete
product.

7. Do not c heck hi gh volt age by dr awing an arc. U se a high voltag e
meter or a high v oltag e pr ob e wit h a V T VM . D ischarge th e
picture tube before attempting meter connection, by connecting

a cl ip lead to th e gr ou nd frame and conn ecting the oth er end of
the lead through a 10kΩ 2W resisto r to the an od e butt on .

8. When se r vice is requ ired, obser ve th e or igina l lea d dr ess. Extr a
prec aut ion sh ou ld b e g iven t o assure cor r ect lead dress in the
high voltag e cir cuit area. W her e a s hort ci r cuit has occu rred,
th ose co mp on ent s tha t indi cate evi de nce of overheating sho ul d

be replace d. Alwa ys use th e manuf act urer's r ep lacem en t
components.

9. Isolation Check

(Safety for Electrical Shock Hazard)

Af ter re-ass emb ling the p r odu ct, always perf orm an isolation
ch eck on the expo sed metal parts of t he cabin et (ante nn a

termina ls, video /audio inpu t and ou tput t ermin als, Control kn obs,
metal cab ine t, screw h eads , ear p ho ne j ac k, c ont rol shaft s, etc .)
to be sure th e p rodu ct is s af e t o o perate without d an ger of
elect rical shoc k.

(1) Dielectric Strength Test

The isolation between the AC prima ry circuit and all me tal p arts
exp osed t o th e user, p articul arly an y expos ed metal part havi ng a
return path to the chass is sho uld withs tan d a vol t age of 3 000 V
AC (r.m.s.) for a period of one second.

(. . . . W it hstand a vo lt ag e of 1 10 0V A C (r.m.s.) to an applianc e

rated up to 12 0V, an d 3 00 0V AC (r .m.s.) to an applian ce r at ed
200V or more, for a period of one second.)
This method of test requires a t est equipment n ot generally found
in the ser vice trad e.

(2) Leakage Current Check

Plug th e A C line c ord d irect ly in to the AC outlet (do not use a lin e
isolation transf ormer during this ch eck.). Using a " Lea kage

Curr ent Tester", measure th e leakag e curre nt f rom each exposed
metal part of the ca bi ne t, particu larly any e xpos ed metal part
havi ng a r e tur n path to t he ch ass is , to a kn ow n go od ea rt h
ground (wa ter pip e, etc.). An y l eakage cur r en t m ust n ot e xceed

0.5mA AC (r.m.s.).
However, in tropic al area, th is must no t exceed 0.2 mA AC
(r.m.s.).

"""" Alternate Ch e ck M ethod

Plug th e A C line c ord d irect ly in to the AC outlet (do not use a lin e
isolation tran sformer dur ing t hi s che ck.). Use an AC vo ltmeter

havi ng 1 00 0 oh ms per volt or more sens itivity in the fo llow ing
manner. Connec t a 1 500Ω 10W res istor paralle le d b y a 0.1 5µF

AC-type capacit or bet ween an expo sed met al part and a known
good earth gro un d (water pipe, etc.). Meas ur e the AC vo lt ag e
acr oss th e res ist or with th e AC voltmeter. Move the resistor
con nec ti on to e ach exp ose d me tal par t, p art icul ar ly any exp osed

metal part havi n g a r etu rn pat h to t he ch assis , an d m easure the
AC voltag e ac ross the res ist or . No w, rever se th e plug in th e AC
outlet and re pe at eac h mea surem en t. An y volt ag e me asured
must no t exceed 0.75V AC (r.m.s.). This c orre spo nds to 0.5mA
AC (r.m.s.).

Howeve r, in tropica l area, this must not exce ed 0.3V AC ( r .m.s.).
This corresponds to 0.2mA AC (r.m.s.).

AC VOLT METER
(HAVING 1000 Ω /V,
OR MOR E SENSIT IVITY)

0.15μF AC-TYPE

PLACE THIS PROBE

1500 Ω 10W

GOOD EARTH GROUND

ON E A C H EX PO SE D
ME T AL PA R T

No.51917

3

A

V-T2922

FEATURES

" The stable image proces sing ci rcui t wh ic h is al ready acknowledged en ables p owerfu l image expression by t he 29 in ch big scr een.
"

Multifunct ion al remote con trol p ermits picture adjustment.

"

With AUDIO / VIDEO inpu t termina l.

" Variable aud io outpu t termina l.
" Ad opti on of the VIDEO STATUS f unc tion .

"

Ad option of the SLEEP TIMER f unction .

"

With 75ΩV/U i n c ommon (F-Type) antenna terminal.

"

Wide range voltage (120V～240V) AC power i npu t.

"

I2C bus control utilizes single chip ICs.

" Built-in HYPER SURROUND system.
"

CLOSED CAPTION broadcasts c an be viewed.

MICR O COMPUTER PORT ASSIGNMENT (IC701)

PORT NUMBER PORT FUNCTION PORT NUMBER PORT FUNCTION

1 H SYNC 27 Vcc

2 V S YNC 28 OSC1

3 RF AFC 29 OSC2

4 REMOCON 30 RESE T

5 NECK 31 POW ER ON/OFF

6 SD 32 ENAB LE

7 T ON/O FF 33 CLOCK

8 KE Y2 34 DATA

9 KE Y1 35 LO CK

10 SP ON/OFF 36 SDA2

11 NC 37 SDA1

12 NC 38 SCL2

13 NC 39 SCL1

14 AUDIO MUTE 40 Ym

15 I2C H/S 41 BUS FREE

16 NC 42 NC

17 NC 43 SELECT1

18 A Vcc 44 SELECT2

19 HLF 45 AGC MUTE

20 RVCO 46 AGC ADJUST

21 V HOLD 47 TV / EXT

22 Composite VIDEO IN 48 X-RA Y / OCP

23 CN Vss 49 Ys

24 X IN 50 B

25 X OUT 51 G

26 Vss 52 R

4

No.51917

A

2

FUNCTIONS

FRONT CONTROL KEYS

①①①①②

②③

②②

① MENU / OPERATE ▼ key
②

③

④

⑤

③④

③③

④⑤

⑤

④④

⑤⑤

REAR TERMINALREMOTE CONT RO L UNIT (RM-C363)

CHANN EL ― /＋ or

OPERATE / keys

VOLUME ― /＋ keys
POWER button
LED (indicator)

････

Red
Green･･On Timer indication

Power indication

V-T292

①①①①
②②②②

③③③③

④④④④

⑤⑤⑤⑤

⑥⑥⑥⑥

⑦⑦⑦⑦
⑫⑫⑫⑫

⑧⑧⑧⑧

⑨⑨⑨⑨

⑩⑩⑩⑩

⑪⑪⑪⑪

⑬⑬⑬⑬

⑭⑭⑭⑭

③③③③②②②②①①①①

①

INPUT 1 (V, L/R ) terminal

②

INPUT 2 (V, L/R ) terminal

③

VARIABLE AUDIO OUT (L/R) terminal

④

Aerial socket (F-type connector)

① DISPLAY key ⑧ CH ANNEL ▲/▼ key
②

TV / VIDEO key

③

CLOSED CAPTION key

④

SLEEP TIMER key

⑤

VIDEO STATUS key

⑥

COLOR SYSTEM key

⑦ EXIT key ⑭ VOLUME -/+ key

⑨

POWER button

⑩

CHANN EL NUMBER key

⑪

HYPER SURROUND key

⑫

ME NU ▲/▼ key

⑬

MENU - / + key

④④④④

No.51917

5

A

V-T2922

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the po wer plu g from AC ou tlet.

2. As shown in F ig. 1, remove t he 11 screws marked

screws marked "

Note:
When reinstalling the rear cover, carefully push it inward after

inserting the chassis into the rear c over groove.

".

""

!!!!

and 2

REMOVING THE CHASSIS

" After removing the rear cover.

1. Sli ght l y raise t he bot h si de s of th e chassis by hand and remove
th e 2 claw s under the b oth si d es of the chassis f rom the fr ont

cab inet .

2. Draw the c hassi s backwa rd al ong t he ch assi s rail in the ar row
direction marked #

(If necessary, remove t he wire clamp, connectors etc.)

Note:
When con ducting a c heck with p ower su pplied, be s ure t o conf irm

th at the CRT earth wire is certainly co nn ecte d.

# as s hown in the Fi g. 1.

##

CHECKING THE MAIN PW BOARD

To check the backside of t he MA IN PW Bo ard.

1) Pu ll out the chassis. ( Refer to REMOVING THE CHASSIS ).

2) Erect the chassis vertically so that you can easily check the
backside of the MAIN PW Board.

[CAUTION]

"

When erecting the chassis, be careful so that there will be no

con tact in g with ot her PW B .

" Before turning on power, make sure that the CRT earth wire

and oth er con nector s are prop erly conn ected.

WIRE CLAMPING AND CABLE T YING

1. Be sure to clamp the wire .

2. Never r emo ve the c able ti e used f or tying the wi re s togethe r.
Should it be inadvertently removed, be sure to tie the wires with a

new cable tie.

REMOVING THE SPEAKER

" After removing the rear cover and chassis.

1. As s hown in Fi g.1 , rem ove th e 4 screws marked $

2. Foll ow th e s ame st eps when rem oving the other hand spe aker.

$.

$$

6

No. 51917

A

2

FRONT CABINET

V-T292

CRT

SP EAKE R

D

CRT SOCKET PWB

(Within MAIN PWB)

MAIN PWB

FRONT CONTROL PWB

CLAW

SP EAKE R

REAR COVER

D

CLAW

C

B

A

POWER CORD

Fig. 1

No. 51917

7

A

V-T2922

SYS

S

O

G

S

CC

S

O

S

U

S

O

SOU

US

O

S

)

VIDEO

MEMORY IC REPLACEMENT

1. Memory IC

This model uses a memory IC.
The memory IC stores data for proper operation of video/chroma and deflection circuits.

When replacing, be sure to use the IC c ontai nin g initia l setting d ata .

2. Memory IC replacement procedure

PROCEDURE

(1) Power off

Switch off the p ower and disconnec t the power pl ug from t he out let.

(2) Replace the memory IC.

Be sur e to use th e m emory IC writt en with t he in itial set ting values.

(3) Power on

Connect the power plug t o the outlet and sw it ch on the po wer.

(4) System constant check and setting

It must not adjus t without signal.

1) Sim ul ta neo usly pr ess the DISPL AY key and VI DEO ST ATU S key
of th e rem ot e control unit.

2) The SERV ICE M EN U screen is d isp layed as sh own in Fig .1.

3) Whil e t he SERVICE MENU is disp layed , ag ain si multaneo usly
press the DISPLAY an d VI DE O ST ATU S keys to display t he

SY STEM CONSTAN T screen as shown i n Fig. 2.

4) Refer to th e S YSTEM C ON STANT t able and ch eck the s etting
items. W her e th ese diff er, select the sett in g ite m with t he MENU

▼▼▼▼

/

keys an d a dj ust the sett in g with t he MENU

(The le tters of t he s elect ed it em ar e displ a yed in ye llow.)

5) When adjust me nt has completed, pres s th e MENU ―――― / ＋＋＋＋ key to
store the setting value.

6) Press the EX IT key twic e to return to th e normal screen.

――――

/

＋＋＋＋

▲▲▲▲

keys.

ERVICE MEN

PICTURE

VID EO STA T

RF AFC CHK VCO (CW

I2C BUS CTRL

ELECT BY

PERATE BY

TEM CONSTANT

AM E : YE

D: YE

VID E

ELECT BY

PERATE BY

ND

THER

EX IT BY

Fig.1

: 2

EX IT BY

Fig.2

EXIT

EXIT

IT

IT

(5) Receiving channel setting

Refer to th e OPERATING INS TRUCTIONS (USER’S GUIDE) and
set the rece ive ch ann els ( Cha nn els Pr eset) as desc ribed.

(6) User setting s

Check th e user s etting items according to th e Table 2 given pag e
later.

Where thes e do n ot agree, refer t o the O PERATING
INSTRUCT IONS (USER’S GU ID E) an d s et t he it ems as desc rib ed.

(7) SERVIC E MENU s etti ng

Verif y what to s et in the SERVICE MENU, and set whatever is
necessary. (Fig.1) refer to the SERVICE ADJUSTMENT for setting.

8

DISPLAY

STATUS

EXIT

MENU

UP/DOWN

MENU

LEF T/RIGHT

No. 51917

A

2

VALUES OF SYSTEM CONSTANT (TABLE1)

Setting item Setting content Setting value

V-T292

GAME YES

HYPE R S CAN YES

SURROUND YES

CCD YES

VIDEO 2

YES NO

YES NO

YES NO

YES NO

210

VALUES OF USER SETTING ITEMS (TABLE2)

Setting item Setting value

Settings of switches on front panel and remote control unit

MAIN POWE R OFF
SUB P OWER ON
CHA N NE L CH 02
CHA NNEL PRESET Refe r to O PERATING INSTR UCTIONS
VOLUME 10
TV/V IDEO TV
DISPLA Y OFF
SLEEP TIME R 0
VIDEO STATUS ES TANDAR
CLOSED CAPTIO N NO (CC1/T1)
HYPER SURROUND NO

Settings of MENU screen

TINTE ESTANDER
COLOR ESTANDER
CONTRASTE ESTANDER
BRILLO ESTANDER
DETALLE ESTANDER
GRAVES CENTER
AGUDOS CEN TER
BALANCE CENTER
MTS ESTEREO
ALTAVOCES SI
AJU STE DEL RELOJ Unn ecess ary to set
TEMPORIZADOR NO
LIS TA DE CANAL ES Unnecess ar y to set
ADJUSTECÓ DIGO DE ACCES O Unnecessary to set
PROGRAMACI ÓN AUTOMÁTICA Unnecessary to set
MO DE TV
PANTALLA AZUL N O
SUBT ÍTULOS OCUILTOS SUBTÍTULOS : CC1 TEXT0 : T1
IDIOMA ES P.

No. 51917

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