JVC AV-21BF11 Schematic

S

S

S

SERVICE MANUAL

COLOUR TELEVISION

AV-21BF11ENS
AV-21BF11EES

AV-21BF11ENS

AV-21BF11EE
AV-21BF11EP

AV-21BF11EJ

AV-21BF11EPS
AV-21BF11EJS

CONTENTS

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SPECIFICATIONS

! SAFETY PRECAUT IONS ･･････････････
!

FEATURES

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MAIN DIFFERENCE LIST ･･････････････

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COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

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SPECIFIC SERVICE INSTRUCTIONS

! SERVICE ADJUSTMENTS････････････
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PARTS LIST

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OPERATING INSTRUCTIONS

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STAND ARD CIRCUIT DIAGRAM

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････････････ 11

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No.520 55
Jul. 200 2

6

21

2- 1

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V-21BF11ENS

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V-21BF11EES
V-21BF11EPS
V-21BF11EJS

SPECIFICATIONS

Item

Dimensions ( W××××H××××D ) 60 0m m× 4 48mm×4 76mm

Mass 22 .2 kg

TV RF System B/G B/G , D/K , K1 B/G , L/L ’ I/I ’

TV Mode PAL PAL / SEC AM PA L / SE C AM PA LColour Syst em

Video Mode PA L / SE C AM / N TSC 3 .58 / NTSC 4 .43 (EES/E PS M ODEL)

Sound System German + NICAM

Teletext System Fast ext / Topte xt

Receiving Frequency

VHF (VL) 46.25 MHz ～ 1 68. 25MHz

(VH) 17 5.25MH z ～ 46 3.2 5MHz

UHF 47 1.2 5MHz ～ 86 3.2 5MHz

CATV S01 - S4 1 & S75-S79

Intermediate Fr equency

VIF Carrier 38 .9 MHz ( B/G , D /K , L , I ) / 3 3.9MHz( L’)

SIF C ar rier 33.4 MHz (5 .5MHz:B/G) / 32. 9MHz (6.0MHz:D/K , I ) / 32.4MHz ( 6. 5MHz: L) / 40.4MHz (6.5MHz:L’)

Colour Sub Carrier Freq.

PAL 4.43MHz

SE CAM 4.43MHz

NT S C 3.58MHz / 4.43MHz

Power Input AC 2 20V ～240V , 50Hz

Power Consumption 85W (Max) ,2 .5W(Standby)

Aerial Input Term 75 Ωun ba lanc ed, C oax ial

Pictur e Tube Size Visi bl e size : 51cm, M eas ured dia gon ally

Hi gh Vo l t ag e 27 .7 kV

Speake r 5.7 cm×16cm Oval type ×2

Au dio Output 6.5 W×2

Input

Output

Input Terminal

Remote Control Unit VE -3 00 17763 (R M-C 1100), (A A/R0 6 dry b atter y×2)

Vide o 1Vp- p, 75

S/V ideo Y : 1Vp- p Pos it i ve

Au di o ( L/ R) 500mVr ms, Hi gh Imped an ce

Vide o 1Vp- p 7 5Ω

Au di o ( L/ R) 500mVr ms, Low Impe da nce

Rear Sid e AV 1 (Vi d eo/Aud i o/R GB)

Front Side AV 3 ( Vi d eo/Aud i o)

Front Side H eadph on e jac k (S ter e o mi ni jack 3.5 φ)Output Terminal

Rear Sid e AV 1 (Vi d eo/Aud i o)

AV-21BF11ENS AV-21BF11EES AV-21BF11EPS AV-21BF11EJS

PAL / NTSC 3 .58 / NTSC 4 .43 (ENS/ EJS MODEL)

Ω

C : 0 .2 86Vp-p

AV 2 (Vid eo/A udio/S-VHS)

AV 2 (Vi d eo/A ud io) (S el ect ed T V,A V1 or AV3)

Content

De sign & speci f icatio ns ar e su bje ct to cha ng e wi thout no t ice.

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No.52055

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A

S

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S

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■■■■21-pin Euro connector (SCART socket) : AV-1 / AV-2

(P-P= Peak to Peak, S-W= Sync tip to white peak, B-W= Blanking to white peak)

V-21BF11ENS

V-21BF11EE
V-21BF11EP

V-21BF11EJS

Pin No.

1

2

3

4

5 GND (B) ○○

6

7

8

9 GND (G) ○○

10 SCL3 NC NC

11

12 SDA3 NC NC

13

14

15

16 Ys input Low : 0 - 0.4, High : 1 - 3V, 75Ω○ NC

17

18

19

20

21

AUDIO R o utput 50 0m Vr ms(Nomina l) ,

AUDIO R i n put 50 0m Vr ms(Nomina l) ,

AUDIO L outp ut 50 0m Vr ms(Nomina l),

AUDIO G ND ○○

AUDIO L input 500mVrms(Nominal),

B in pu t

FUNCTION SW

(SLOW SW)

G in put

GND (R)

GND (YS) ○○

R / C input

GND(V IDEO output)

GND(V IDEO input) ○○

VIDEO ou tpu t

VIDEO / Y input

COM MON G ND ○○

Signal Designation Matching Value AV-1

○

Low impedance

High i m pe danc e

Low impedance

High i m pe danc e

70 0m V

Low : 0-3V, High : 8-12V, High
impedance

70 0m V

R : 700mV

C : 300mV

1V

P- P

1V

P- P

Ω○NC

, 75

B- W

, 75Ω○

B- W

Ω

, 75

B- W

, 75Ω

P- P

(Nega ti ve g oi n g s ync ), 75

(Nega ti ve g oi n g s ync ), 75

Ω○

Ω○ ○

(TV OUT)

○○

○

(TV OUT)

○○

○○

○○

○

(only R )

○○

(TV)

AV - 2222

○

○

NC

○

○

[Pin assignment]

No.52055

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V-21BF11ENS

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V-21BF11EES
V-21BF11EPS
V-21BF11EJS

SAFETY PRECAUTIONS

1. T he des i gn of th is pr od uc t c on ta in s sp ecial hard ware , ma ny
circuit s and components specially for saf ety purposes. For
con tinu ed pr ot ecti on , n o chan g es sh ould b e ma de to the o rig i nal
d esign un less a uth or ized in writi n g by th e manu fac t urer .

Replacem ent p arts m ust b e i d entic al to thos e u sed in th e or i gi n al
ci rcu its. Se r v ic e s h ou ld be pe rf or me d b y qua lifi e d per s o nn el
on ly.

2. Al te rati on s of the desig n or cir cuitry of t he prod uc ts sh ould not be
made. Any design alterations or additions will void the
manu fac t urer 's warra nt y and will f urth er r el i eve t he ma nufac tu rer
of r esp onsib ili ty for per s o na l injury or pr operty d am ag e res ul t ing
th erefr om.

3. M an y el ectr i cal an d mech anic a l p ar ts i n th e pr od uc ts ha v e
special safety-related chara cteristics. T hese characteristics are
oft en no t e vi den t f r om v i sua l insp ecti on nor ca n t he pro tect io n
aff orde d by th em nece ssarily be ob tain ed b y u s in g r ep l ac em en t
com po nents rated for hig he r vo l tag e, watt age, etc . R ep lac em en t
p arts whic h have th ese sp ecial s afet y ch ar act erist ics ar e

ide ntified in the parts list of Ser vic e manua l. El ectric al

components having such features are ide ntified by shading
on the sche mat ic s and b y (!!!! ) on the parts list in Service
manual. The us e of a sub sti tu te r ep lac em en t which do es n ot

h ave th e sam e s af ety c h ar ac t erist ics as t he reco mmen ded
replac ement par t sh ow n i n th e parts list of Ser v i ce man ual m ay

cause shock, fire, or other hazards.

4. Don't s hor t between the LIVE side ground and ISOLATED

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

Some model's power circuit is partly different in the GND. T he
diff erenc e of th e GND is sh ow n by t he LIVE : (") side GN D, the
ISO LATE D(N EU TR AL) : ( #) side GN D an d EA RTH : ($) side
GND. Don't short between the LIVE side GND and

ISO LATE D(N EU TR AL) si de GND or EAR TH sid e GN D an d
n ever mea sure w it h a mea sur i ng a ppa r atus ( osci l lo scop e etc.)
th e LI VE sid e GN D an d IS OL ATED(NEUTR AL ) s id e GN D or
EARTH sid e GND at the s ame time.
If above not e 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 set ting shou l d b e c h ec ked or adju ste d ( Se e
ADJUSTM ENT OF B 1 POW E R SUPPLY).

6. The high vol ta ge app lie d t o th e pi ctu r e tu be mu s t c on form wit h
th at sp ecifi ed i n S ervi ce man ual . E xc essi ve h i gh volt ag e c a n

cau se an i ncr e ase i n X- R ay em iss i on , arci ng an d possi b le
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 occur s, r emov e t he AC power

immed iate l y and de ter m i ne th e ca us e b y vi sua l insp ec t ion
(incor r ec t in stal lat i on, cr ac ke d or melte d hi gh v o lt age harn ess,
p oor so ld er ing, et c.) . T o m ai nt ain the prope r mi n imu m le vel of
sof t X- R ay em iss i on, c omp on en ts i n th e hi gh voltag e c i r cuitr y
incl ud i ng t he pict ure tu be must b e t he e xact r ep l acem e nts or

alte rn at ives ap pr ove d b y th e manuf ac t urer of th e c omplet e
prod uct.

7. Do n ot c hec k high volt ag e by dr aw ing an arc. Use a hi gh volt age
meter or a hig h v oltag e pr ob e wit h a VT V M. Dis charg e the
picture tube before attempting meter connection, by connecting

a cl i p le ad to th e gr ou nd f rame a nd c onn ecti n g th e oth er end of
the lead through a 10kΩ 2W resi s to r to the an ode b utt on .

8. When service is r equ ire d, ob serve the or igina l lea d dr ess. E x tr a
prec aut i on sh ou ld b e given t o assur e cor r ect l ea d dress in th e
high vol tag e circui t a rea. W her e a s hor t c i r cuit h as occ u rr e d,
th ose co mpon ent s tha t indica te evide nce of ove r hea ting should

b e r e place d. A lways u s e th e manuf act ur er 's rep lacem ent
components.

9. Isolation Check

(Safety for Electrical Shock Hazard)

Af ter r e- ass embl in g th e p r odu ct, always per f orm an i solat io n
ch eck on the expo s ed me tal p ar ts of t he cabin et ( a nte nn a

ter m i na ls, vid eo /au dio i npu t and outpu t t ermi n al s, C on trol kn obs,
metal cabinet, screwheads, earphone jack, control shafts, etc.)
to be su re th e p r odu ct is s af e t o o pe rate with ou t d an ger of
elect rical shoc k.

(1) Dielectric Strength Test

The iso lation be tw een the AC pr im a ry ci rcu it an d al l me tal p arts
exp osed t o the us er, p ar ticular ly an y e xpos ed met al p art having a
retu rn p ath to t he c hass is sho uld withs tan d a vol t age of 3000 V
AC (r.m. s.) for a period of one second.

(. . . . W it hstan d a v o lt age of 110 0V A C (r .m. s.) t o an ap pli anc e

rate d up to 12 0V , an d 3 00 0V AC ( r.m. s.) to an ap pl i an c e r at ed
200V or more, for a period of one second.)
This meth od of test r equi res a test equipment n ot g enerall y fou nd
in t he serv ic e trad e.

(2) Leakage Current Check

Plug th e AC l in e c ord d irect ly into the A C ou tlet ( d o not use a lin e
isol ati o n transf orm er du r ing this ch eck.). U sin g a " Lea kag e

Current T este r", me as ur e th e l ea k ag e cu rr e nt f rom eac h ex p os ed
metal p ar t of the cabine t, p art icu lar ly any e x pos ed me tal p art
h aving a re turn pa th to the ch assis , to a kn own go od ea rt h
grou nd (w a ter pip e, e tc.). An y l eaka ge c ur r en t must n ot e xceed

0.5mA AC (r.m.s.).
Howev e r, in trop ic al ar ea , th is mu st no t ex ce ed 0.2 mA AC
(r.m.s.).

"""" Alte rn at e Che ck M et hod

Plug th e AC l in e c ord d irect ly into the A C ou tlet ( d o not use a lin e
isol ati o n tran sfor m er dur i ng this c he c k.). Use an AC vo lt meter

h aving 1 00 0 oh ms pe r vol t or mor e s ens it i vity i n th e fo llowi ng
mann er . C on nec t a 1 50 0Ω 10W res ist or para lle led b y a 0 .1 5µF

AC-type c apa cit or bet ween an expo sed met al pa rt and a kno wn
g ood e ar th gr o und (water pi pe , etc.) . M eas ur e th e A C volt ag e
acr os s th e res ist or wi th th e AC vo l tm eter. Move th e r es i stor
con nec tion to e ach exp ose d me tal part, p art i cularly any exp osed

metal p ar t havi n g a r etu rn pat h to the ch assis, and m easu r e th e
AC vol tag e ac ros s the res ist or. No w , re v er se th e pl u g in th e AC
ou tl et and re pe at eac h mea suremen t. An y vol t ag e me asu re d
must no t e xc eed 0 .7 5V AC (r.m. s.) . This c orre spo nds to 0 .5mA
AC (r.m. s.).

Howeve r, in tropica l area, this must n ot exce ed 0 .3V AC ( r .m.s.).
This corresponds to 0.2mA AC (r.m.s.).

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

0.15μF AC-T YPE

PLACE THIS PROBE

1500 Ω 10W

GOOD EARTH GROUND

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

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No.52055

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FEATURES

V-21BF11ENS

V-21BF11EE
V-21BF11EP

V-21BF11EJS

1. It is a remote controlled color television.

2. 10 0 pr og r am s fr om VHF , UH F b an ds or cab l e ch ann el s can be

pres et.

3. It c an tun e c abl e c ha nn els.

4. Cont ro l lin g th e TV i s ver y easy by its men u driven s yst em .

5. It h as two Eu r oc on n ector s ockets for exte rnal de vice (suc h as
vi de o reco rder , vid eo games , a udi o set, etc.)

6. Front AV In put ava ilable.

7. St ereo s ound s ys tems ( Ger m an + N ic am) ar e a v ailab l e.

8. Full functio n Teletext (Fast ext, Topte xt).

9. It is possib l e to con nec t h ead ph one.

10. Direct channel access.

11 . APS (Aut omat ic P r ogr am m i ng Syste m).
12 . All pr og r ams ca n b e nam ed .
13 . Forward o r bac kward au to ma ti c tu ning .

14 . Sl ee p timer.

15. Child Lock

16 . Au tom at ic sou nd mu te when no tran smiss i on .
17 . 5 minu tes aft er the br o adc asti ng ( c l osed own) , the TV s witc h es

itsel f aut omati ca lly t o st and- by mod e.

MAIN DIFFERENCE LIST

Model Name

!!!!

Part Na me

MAIN PWB VE-20101119 VE-20101113 VE-20101120 VE-20101540

!

RATING LABEL VE-20101395

CARTON BOX VE-50028254 VE-50028331 VE-50028286 VE-50028413

AV-2 1BF11ENS AV -21B F11EES AV-2 1BF11EP S AV-2 1BF11EJ S

VE-20101660

VE-20101560

(POLAND)

VE-20101548 VE-20101872

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INSTRUCTION BOOK VE-50028252 VE-50028323 VE- 50028287 VE-50028290

No.52055

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V-21BF11ENS

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V-21BF11EES
V-21BF11EPS
V-21BF11EJS

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unp lu g t he po we r c ord.

2. Remove th e 6 screws marked A as show n in t he F i g. 1.

3. W i thdr a w t he r ear co ver to wa rd y ou .

REMOVING THE MAIN PWB

" Removing the rear cover.

1. Rem ove the sc r ew m ar ked B as s hown in the Fig.1.

2. Sl i ght ly r ai s e t he bo th sid es of th e ch assi s b y h and an d withd r aw

th e M AIN PW B backw ar d.
(If necessary, take off the wire clamp, co nnectors etc.)

REMOVING THE SPEAKER

"

Removing the rear cover.

1. Rem ove t he 2 scr ews m ar k ed C, an d re mo v e sp ea k er as s how n

in Fig. 1.

2. Rem ove the sp eake r .

REMOVING THE FRONT AV & HEADPHONE PWB

" Removing the rear cover.
"

Removing th e rear MAIN PW B .

1. Remove the 2 scr ew s marked D.

2. Rem ove the FR ONT AV & HE AD PHONE PW B.

CHECKIN G THE PW BOARD

To c h ec k the back s i de of th e PW B oard.

1) Pu ll o ut th e PW B oar d. (Ref er to REMOV ING THE MA IN
PWB ) .

2) Erec t th e PW B oar d ve rtic al l y so t ha t y ou c an eas i ly c h ec k
th e back s i de of th e PW B oard.

[CAUTION]

" When e recting the PW Board, be c areful so that t here will be no

con tact ing with ot her PW Boar d.

" Be fore tur n ing on po wer , ma ke sur e t ha t the wire co nn ecto r is

prop er l y con nected .

" W hen condu cti ng a c h ec k wi th p ow er su pplied , b e sure to c onfir m

th at t he CRT E AR T H WI RE (B RAIDED AS S’Y) is co nne c ted t o
th e C R T SOC KE T PW b oard.

WIRE CLAMPIN G AND CABLE T Y ING

1. Be sure t o clamp th e wire.

2. Never rem o ve th e cable ti e u sed f or t ying th e wires to ge the r.
Sh oul d it be i n adv e rt ent l y rem ove d, b e su r e to tie th e wires w it h
a n ew c able tie.

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No.52055