JVC AV-28BS88EN, AV-28BT80EN, AV-28BT80EP, AV-28BT8EEB, AV-28BT8EES Service Manual

...

AV-28BT8ENS / AV-28BT8ENB / AV-28BT80EN

AV-28BT8EPS / AV-28BT8EPB / AV-28BT80EP

AV-28BT8EES / AV-28BT8EEB/ AV-28BS88EN

SERVICE MANUAL

COLOUR TELEVISION

AV-28BT8ENS / AV-28BT8ENB AV-28BT80EN / AV-28BT8EPS

AV-28BT8EPB / AV-28BT80EP AV-28BT8EES / AV-28BT8EEB

AV-28BS88EN

SPECIFICATIONS

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

FEATURES

MAIN DIFFERENCE LIST ･･････････････

･･････････････････････････

････････････････････････････････････････････････････

････････････････････

････････････････････････････････････････

･･････････････4

････････････････････････････

･･････････････5

････････････････････････････

SPECIFIC SERVICE INSTRUCTIONS

! SERVICE ADJUSTMENTS････････････ !

PARTS LIST

★

OPERATING INSTRUCTIONS

★

STAND ARD CIRCUIT DIAGRAM

･･･････････････････････

･･････････････････････････････････････････････

････････････ 11

････････････････････････

････

････････

･･････

････････････

No.520 57 Jul. 200 2

2- 1

V-28BT8ENS / AV-28BT8ENB / AV-28BT 80EN

V-28BT8EPS / AV-28BT 8EPB / AV-28BT80EP V-28BT8EES / AV-28BT 8EEB/ AV-28BS88EN

SPECIFICATIONS

Content

Item

Dimensions ( W

Mass 33.2 kg

TV RF Syste m B/G B/G , L /L ’ D/K , K1 B/G

Colour Sy st em

Sound System German + NICAM

Teletext System

Receiving Frequency

Intermediate Fr equency

Colour Sub Carrier Fr eq.

Power Input AC 220V ～240V , 50Hz

Power Consumpti on

Aerial Input Term 75 Ωun ba l anc ed, Coax ial

Picture Tube Size Visi ble si ze : 66cm , M eas ured dia gon al ly

Hi g h V o lt ag e 30 .3 kV 30 .3 kV 30 .3 kV 29 .6 kV

Speaker 5.7 cm×16cm Oval type×2

Au dio Output 10 W ×2

Input

Output

Input Terminal

Output Terminal

Remote Control Unit VE -3 00 177 63 (RM-C 11 00) , (A A/R0 6 dry bat ter y×2)

××××H××××

D ) 77 x 58 x 48 cm

TV Mode PAL PAL / SE CAM PAL / SE CAM PAL

Video Mode PA L / SE CAM / NTSC 3 .58 / NTSC 4 .43 (EP/EE MODEL S)

VHF(VL)46 .25 MH z ～ 1 68. 25 MH z

(VH)17 5.2 5MH z ～ 46 3.2 5MH z

UHF 471.2 5MHz ～ 86 3.25MHz

CATV S01-S4 1 & S7 5-S79

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

SIF C ar rier 33.4 MHz ( 5 .5MHz:B/G) / 32.9MHz (6 .0MHz:D/K) / 32 .4MHz (6.5MHz:L) / 40.4MHz ( 6 .5MH z:L’)

PAL 4.43MHz

SE CAM 4.43MHz

NT S C 3.58MHz / 4.43MHz

Vide o 1V p-p, 75 Ω

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

Au di o(L/ R)50 0mVrms, High Imp ed an ce

Vide o 1V p-p 7 5Ω

Au di o(L/ R)50 0mVrms, Low Im pe da nce

Rear Sid e AV 1 (Vi d eo/A udi o/R GB)

Front Side AV 3 (Vi d eo/A udi o)

Front Side

Rear Sid e AV 1 (Vi d eo/A udi o)

AV -2 8BT 8 EN S AV -2 8BT 8 EN B AV-28BT 8 0EN

PAL / N TSC 3.58 / NTSC 4 .43 (EN MODELS)

Fast ext / Topte xt

11 4W (Max) 4W (Sta nd by)

C : 0 .2 86V p-p

AV 2 (Vi d eo/A ud io/S-VH S)

Headphon e jac k (Stere o mini j ack 3.5φ)

AV 2 ( Vi d eo/A ud i o) (S elect ed TV,A V1 or AV 3)

AV- 28 BT8 EPS AV- 28 BT8 EPB AV - 28 BT8 0E P

11 4W (MAX) 4W (Sta nd by)

AV- 28 BT8 EES AV- 28 BT8 EEB

11 4W (MAX) 4W (Sta nd by)

13 5W (Max) 4W (Sta nd by)

AV-28B S88EN

De sign & specificatio ns ar e subje ct to cha nge wi thout notice.

No.52057

V-28BT8ENS / AV-28BT8ENB / AV-28BT 80EN

V-28BT8EPS / AV-28BT 8EPB / AV-28BT80E

V-28BT8EES / AV-28BT 8EEB/ AV-28BS88EN

■■■■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)

Signal Designation Matching Value AV-1 AV-2

No .

1 AUDIO R out put 50 0mVrms( Nomi na l),L ow im pedan ce

2 AUDIO R input 500mVrms(Nominal),High impedance ○○

3 AUDIO L o utp ut 50 0m Vr ms( N omina l) ,L ow impe danc e

4 AUDIO G ND

5 GND (B) ○○

○

(TV OUT)

○

(TV OUT)

○○

○

(TV/LIN E OUT)

○

(TV/LIN E OUT)

6 AUDIO L input 500mVrms(Nominal), High imp edance

B-W

7B input

FUNCTON SW

(SLOW SW)

9 GND (G)

10 - NC -

11 G in put

- NC -

13 GND (R)

14 GND (YS) ○ NC

15 R / C input

16 Ys i n put L ow : 0 – 0. 4, Hi g h : 1 - 3 V, 75Ω○NC

17 GND(VIDEO output)

18 GND(VIDEO input) ○○

19 VID EO output

20 VIDEO / Y inp ut 1V

70 0mV

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

70 0mV

R : 700mV C : 300mV

, 75Ω○

B-W

, 75Ω○

B-W

, 75Ω

P-P

, 75Ω

S-W

(Negative going sync), 75Ω

S-W

(Negative going sync), 75Ω○○

○○

○

○○

○

(R/C)

○○

○

(TV)

○

(only C)

○

(TV/LINE OUT)

21 COMMON G ND

○○

[Pin assignment]

No.52057

V-28BT8ENS / AV-28BT8ENB / AV-28BT 80EN

V-28BT8EPS / AV-28BT 8EPB / AV-28BT80EP V-28BT8EES / AV-28BT 8EEB/ AV-28BS88EN

SAFETY PRECAUTIONS

1. The des ign of th is pr od uc t conta in s sp eci al hardware, many circuit s and components specially for safety pur poses. For con tinu ed pr ot ection, n o chang es s h ou ld b e ma de to the o rig inal

d esi gn un l ess a uth or i zed i n w ritin g by th e manufact ur er. Replac emen t p ar ts must b e id ent ic al to thos e u sed in th e origi n al ci rcu it s . Se r vic e sh ou ld be pe rf ormed by qua lified perso nn el on ly.

2. Alte r ati on s of t he desig n or ci r cui tr y of t he pr od ucts s h ould not be made. Any design alterations or additions will void th e manufact urer 's warr a nt y and w i ll f urther rel i eve t he manufacturer of r esp ons ib ili ty for perso na l injur y or p roperty dam ag e r esult ing th erefr om.

3. Many el ectric al and mech ani ca l p ar ts in th e pr od ucts ha v e special safety-related characteristics. T hese charact eristics are oft en no t e viden t f r om vi sual i nspecti on n or ca n t he pr o tec t io n aff or de d by th em necessari l y be ob tain ed b y us ing replac emen t com po ne nts ra ted for hig he r vol tag e, watt ag e, etc. Rep lacem en t

p arts wh ic h ha ve these sp eci al s afet y ch ar act erist ics are ide ntified in the parts l ist of Service manua l. El ec trical

components having su ch features ar e identified by shading on t he sch e matics and by (!!!! ) on the parts list in Service manual. The us e of a s ub stitute r ep lacem en t w hi ch do es n ot

h ave the sam e saf ety ch ar ac t er ist ics as t he r eco mmen de d replac em ent par t s h ow n in th e p ar ts l i st of S er vi ce manual m ay cause shock, fire, or other hazards.

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

(NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The diff er enc e of the GND i s s h own b y the LI VE s ide G ND, th e ISO LATE D(NEUTRAL) sid e GND a nd EA RTH side GN D. Don' t sh ort b etwee n the L IVE side GND a nd ISOLATE D(N EU TRAL)

si de GN D or EA RTH si de GN D an d ne ver meas ur e with a measu r in g app ar atu s (os c illos c ope et c.) th e LIV E sid e GND an d ISO LATED(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.

5. If any repair has been made to the chassis, it is recommended th at t he B1 set ti ng should b e ch ec ke d or adj u ste d ( Se e ADJUST MENT OF B 1 POWE R SUPPL Y).

6. The hi gh volta ge app lie d t o th e pi ctu r e tu be mu st con for m wit h th at s p eci fi ed i n S er vic e man ual. E xcessive h i gh voltage ca n cau s e an incr e ase in X-R ay emis si on , ar cing an d poss ib 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 occurs, r em ove t he AC pow er immed i ate l y and determine the ca us e b y visua l insp ect ion (inc orrect in stallat ion, cr acke d or m elte d high vo lt age har n es s, p oor so ld er ing, et c .) . T o m aint ain the p r ope r minimu m le vel of sof t X- Ray em i ss ion, c omp on en ts i n th e hi gh voltage ci r cui tr y includ ing t he pict ure tu be must b e t he e x act rep lacem e nts or

alte rnat i ves ap prove d b y th e ma nuf act urer of th e c om plet e product.

7. Do not c hec k hi gh volt age by dr aw ing an arc. U se a high vol t age meter or a high v ol tag e pr ob e wi t h a V TVM . Di scha rg e th e

picture tube before attempting meter connection, by connecting a cl ip lead to th e gr ou nd frame and c onn ec ti n g th e other end of the lead through a 10kΩ 2W resi stor to the an od e butt on .

8. When se r vic e is r equ ired, ob serv e th e or i ginal lea d dr ess. Ex tr a prec aut ion sh ou ld b e g i ven t o assur e cor r ect lea d dress in th e high vol tag e cir cuit a rea. W her e a s hor t cir cuit has occu rr e d, th ose co mp on ent s tha t indic a te ev idence of ove r hea ting s ho ul d

b e replace d. A lways use th e ma nuf ac t ur er 's r ep l acemen t components.

9. Isolation Check

(Safety for Electrical Shock Hazard)

Af ter re- ass emb l ing th e p r odu ct, alway s per f orm an isolat ion ch ec k on the expo s ed me tal p ar ts of t he cabin et ( a nte nn a

ter mina ls, vid eo /audi o inpu t and ou tput t er min als, Con 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 r ate with ou t d an ger of elect ri cal shoc k.

(1) Di electric Strength Test

The isolation be tw een the AC pr imary ci rcu i t an d all me tal p ar ts exp osed t o th e us er, p ar ti cul ar ly an y expos ed met al part h avi ng a retu rn p ath to t he chas s is should wi ths tan d a v olt age of 3 000 V AC (r.m.s.) for a period of one sec ond.

(. . . . Withstan d a vo lt ag e of 1 10 0V AC ( r .m. s.) t o an ap pl i anc e

rate d up to 12 0V , an d 3 00 0V AC (r.m. s.) to an ap pliance r at ed 200V or more, for a period of one second.) This meth od of test requires a t est equi pmen t not gen erally fou nd in t he ser vic e tr ad e.

(2) Leakage Current Check

Plug th e A C line c ord direct l y in to the AC outlet (d o n ot use a lin e isolatio n tr ansf or mer du r in g thi s c h eck.) . Usin g a " Lea kage Curr ent Teste r", meas ur e th e lea kag e cu rrent f rom each exp osed metal part of the ca bi ne t, part icu l arly any e xpos ed me tal p ar t h avi ng a r e tur n path to t he chassis , to a kn own go od ea rt h

ground (wa ter pip e, etc.). An y leak a ge cur r en t mus t n ot exceed

0.5mA AC (r.m.s.). Howeve r, in tr op ic al area , th is must no t exceed 0.2 mA AC (r.m.s.).

"""" Alternate Check Method

Plug th e A C line c ord direct l y in to the AC outlet (d o n ot use a lin e isolatio n tr an sformer dur i ng t hi s che ck.) . U se an AC vo lt me ter h avi ng 1 00 0 oh ms per volt or more sens it ivi ty in the fo llow i ng manner. Connec t a 1500Ω 10W res ist or para lle le d b y a 0.1 5µF

AC-type c apa cit or bet ween an expo s ed met al pa rt a nd a known g ood e ar th gro un d ( water pipe, etc.) . M eas ure th e A C vo lt ag e acr oss th e res ist or w ith th e AC voltmeter. M ove the resi stor

con nec ti on to e ac h exp ose d me tal par t, p art i cul ar ly any exp osed metal part havi n g a r etu rn pat h to the c h assis, an d measu r e th e AC vol tag e ac ro ss the res ist or . No w , re ver s e th e pl u g in th e AC ou tl et and re pe at eac h mea surem en t. An y v olt ag e me asu re d must no t exc eed 0.7 5V AC (r .m.s.). This c orre sponds 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 VOLTMETER (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 R T

No.52057

FEATURES

)

(

)

10 0 pr o gr am m ers fr om V H F, UHF b and s or ca bl e ch an nels can

b e pres et.

It has two Euroconnector sockets for ext ernal devic es (such as

vi de o r eco rder , vi d eo ga mes , audio set, etc.)

" St er eo s ound s ystem s ( N icam + Ger m an ) are avai l a ble. "

APS ( Au tomat ic Progra mming Syst em)

MAIN DIFFERENCE LIST

V-28BT8ENS / AV-28BT8ENB / AV-28BT 80EN

V-28BT8EPS / AV-28BT 8EPB / AV-28BT80E

V-28BT8EES / AV-28BT 8EEB/ AV-28BS88EN

Model Name

!!!!

Part Name

MAIN PWB VE-20101577 VE-20101576 VE-20101622 VE-20101578

INST RUCT ION

BOOK

FRON T CABINET

REAR COVER

LENS

! RATING LABEL

CAR TON BO X

AV -2 8B T 8 EN S AV -2 8B T 8 EN B

AV-2 8B T80EN

VE-50028493 VE-50028296 VE-50028326 VE-50028511

VE-20082289(ENS) VE-20081489(ENB) VE-20082289(EN)

VE-20084616(ENS) VE-20069018(ENB) VE-20084616(EN)

VE-20069218

(ENS/ENB

VE-20096162(EN) VE-20102137(ENS)

VE-20102147(ENB) VE-20102144(EN) VE-50028496(ENS)

VE-50028502(ENB) VE-50028500(EN)

AV -2 8B T 8 EP S AV -2 8B T 8 EP B

AV-2 8B T80EP

VE-20082289(EPS) VE-20081489(EPB) VE-20082289(EP)

VE-20084616(EPS) VE-20069018(EPB) VE-20084616(EP)

VE-20069218

EPS/EPB

VE-20096162(EP) VE-20101937(EPS)

VE-20101939(EPB) VE-20101934(EP) VE-50028423(EPS)

VE-50028424(EPB) VE-50028221(EP)

AV -2 8B T 8 EE S AV -2 8B T 8 EE B

VE-20082289(EES) VE-20081489(EEB)

VE-20084616(EES) VE-20069018(EEB)

VE-20069218 VE-20096162

VE-20101919(EES) VE-20101915(EEB)

VE-50028218(EES) VE-50028216(EEB)

VE-20082289

VE-20086416

VE-20102141

VE-50028498

CABINET COLOUR

AV-2 8B S88E N

Mo del Name

FRONT CABINET & REAR COVER LENS

AV-2 8BT8 ENS AV-2 8BT8 EP S

SILVER BLACK

AV-2 8BT8 EE S AV-2 8BT8 ENB AV-2 8BT8 EP B

BLACK BLACK

AV-2 8BT8 EE B AV-28BT8 0EN AV-28BT8 0EP

SILVER SILVER

AV-28BS88EP

No.52057

V-28BT8ENS / AV-28BT8ENB / AV-28BT 80EN

V-28BT8EPS / AV-28BT 8EPB / AV-28BT80EP V-28BT8EES / AV-28BT 8EEB/ AV-28BS88EN

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug t he power c ord.

2. Remove the 8 screws marked A as show n in t he Fig. 1.

3. Remove the 4 screws marked B around the AV TERMINAL

BOA RD.

4. Withdraw the rear co ver to ward y ou .

REMOVING THE AV TERMINAL BOAR D

" Removing the rear cover.

1. Remove th e 2 s cr ew s m ar ke d C f asten ed th e AV TERMINAL BOA RD.

2. Remove th e AV TERMI NAL BOARD .

REMOVING THE MAIN PWB

Removing the rear cover.

" Removing the AV TERMINAL BOAR D.

1. Remov e th e 3 scr ew s m ar ked D as shown i n t he F ig.1 .

2. Slight ly rais e t he both s ides of the ch assi s b y h and an d w ithd raw

th e M AIN PW B bac kw ar d. (If n ecess ary, ta ke off the wir e clamp, connectors etc.)

REMOVING THE SPEAKER

Removing the rear cover.

1. Remov e t he 4 scr ew s m ar ked E, and remove speake r as s h own

in Fig. 1.

2. Remove th e sp eak e r .

CHECKING THE PW BOARD

To c h eck the bac k s ide of th e PW B oard.

1) Pull o ut the PW B oar d. ( R ef er to R EM OV ING THE MA IN PWB).

2) Erec t the PW B oar d vertic ally so t ha t you c an easi ly ch eck th e b ack side of th e PW B oard.

[CAUTION]

" When e recting t he PW Board, be careful so t hat there will be no

con tact in g with ot her PW Boar d.

" Be for e tur n in g on pow er , ma ke s ur e t ha t the wire connector is

properly con nec ted .

" When co ndu cting a ch eck w ith p ower su ppl ied, b e sure to c onfi r m

th at t he CRT E AR TH WI RE (BRAIDED AS S’Y) is co nne cted t o th e C RT SOCKE T PW b oard.

WIRE CLAMPING AND CABLE T YING

1. Be sure to cla mp th e wire.

2. Never r emove the c abl e ti e u sed f or t ying the wi res togethe r. Sh ould it be inadve rt ent ly r em ove d, be s u r e to ti e th e wir es w it h a n ew c abl e ti e.

REMOVING THE FRONT AV & HEADPHONE PWB

" Removing the rear cover. "

Removi ng th e MAIN PWB.

1. Remov e th e 2 scr ew s m ar ked F.

2. Remove th e FR ONT AV & HE ADPHON E PWB.

REMOVING THE FRONT CONT ROL PWB

After removing the rear cover.

1. Remove th e MAIN PW B AS S’Y.

2. Remove th e 5 screws marked G, a nd r em o ve th e FRONT CONTROL PWB.

No.52057

V-28BT8ENS / AV-28BT8ENB / AV-28BT 80EN

V-28BT8EPS / AV-28BT 8EPB / AV-28BT80E

V-28BT8EES / AV-28BT 8EEB/ AV-28BS88EN

(× 8)

(×4)

AV TERMINAL BOARD

REAR COVER

(×3)

MAIN PWB

BAS E BOARD

REAR SIDE

AV TERMINAL BOARD

(×2)

(×4)

CRT

SP EAKE R

(× 5)

FRONT CABINET

(× 2)

FRONT AV & HE ADPHONE PWB

FRONT CO NTROL PWB

Fig. 1

No.52057

+ 15 hidden pages

JVC AV-28BS88EN, AV-28BT80EN, AV-28BT80EP, AV-28BT8EEB, AV-28BT8EES Service Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

MAIN DIFFERENCE LIST

SPECIFIC SERVICE INSTRUCTIONS