JVC AV28CT1EIS, AV28CT1EKB, AV28CT1EKS, AV28CT1EPB, AV28CT1EPS Service Manual

AV28CT1E KS / AV28C T1EK

AV28CT1EPS / AV28CT1EP

SERVICE MANUAL

COLOUR TELEVISION

AV28CT1EKS / AV28CT1EKB AV28CT1EPS / AV28CT1EPB

AV28 CT1 EIS

BAS IC CHASSIS

ⅡⅡⅡⅡ

AV28CT1EIS

SPECIFICATIONS

SAFETY PRECAUTIONS ････････････････････････････････

! WAR NING ････････････････････････････････ !

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

MAIN DIFFERENCE LIST ････････････････････････････････

! SPECIFIC SERVICE INSTRUCTIONS ････････････････････････････････ !

SERVICE ADJUSTMENTS

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

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

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

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

････････････････････････････････

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

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

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

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

･･･････････････････････････････････

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

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

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

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

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

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

････････････････････････････････

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

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

･････････････････････････････

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

･･･････････････････････ 4

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

･･･････････････････････ 6

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

･････････････････････

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

････････････････････････････････････ 33

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

･･･ 5

･････････ 6

･･････

･････････････ 7

･･････････････････････････

★ ST ANDARD CIRCUIT DIAGRAM ････････････････････････････････

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

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

････････････････ 2-1

････････････････････････････････

No.519 52 Mar. 2002

V28CT1EPS / AV28CT 1EPB

V28CT1EKS / AV28CT 1EKB V28CT1EIS

SPECIFICATIONS

Item

Di mensions ( W××××H××××D ) 72 5mm×4 80m m×4 96m m

Mass 33 .8 kg

TV RF System

Colour Sy stem PA L / SECA M /

Stere o Sy st em A2 / NICAM NICAM NICAM

Teletext System FLOF (Fastext)

Receiv ing Frequency

VHF 47 MHz ～ 47 0MHz 47 MHz ～ 47 0M H z

UHF 470MHz ～ 8 62MHz 47 0MHz ～ 862MHz 470MHz ～ 862MHz

French CATV

Interme diate Fr equenc

VIF Carrier 38.9MHz (B/G, I ,L)/ 33.95MHz ( L’) 38.9 MHz ( I ) 38.9MHz ( I )

SIF Carrier 33.4MHz (5.5MHz:B/ G) / 32.9MHz

Colour Sub Carr ier Fr eq.

PAL 4.43MHz 4.43MHz 4.43MHz

SE CAM 4.40625MHz / 4.25MHz

NT S C 3.58MHz / 4.43MHz 3.58MHz / 4.43MHz 3.58MHz / 4.43MHz

Power Input AC 220V～2 40V , 5 0Hz

Power Consumption

Aerial Input Term 75 Ωun ba l anc ed, C oaxi al

Picture Tube Visi ble si ze : 66 cm, Meas ured

Hi gh Vo lt ag e 30.0kV (at zero beam

Speake r

Au dio Output 5W + 5W

EX T-1 /EXT-2/EX T-3 (Input / Output)

EXT-4 (Input) Video

Au di o (L /R )

S / Video

AUDIO OUT (Variable)

Headphone jac k St ereo min i jac k ( φ3.5mm )

Remote Control Unit

(AAA/R03 dr y batte ry ×2)

AV28 CT 1 E PS/EP B AV28 CT 1 EIS AV28 CT 1 EKS/E KB

CCIR ( B/G , I ,L) CCIR (I ) CCIR ( I )

NTSC (Only in EXT mode)

TOP (German system) WST(Standard system)

116MHz ～ 1 72M H z / 220MHz ～ 4 69M H z

(6.0 MHz:I ) / 32.4MHz (6. 5MHz :L) /

27.45 MHz ( 6.5MHz:L’)

15 6W ( Max) / 122W ( Av g) St andby : 0.8 W

12 2W /h (ITA LY)

diagon ally

1kV

current)

10 cm×3c m Oval type×2

21 -pin E ur o c onnec to r (SCART socket)

1V p- p 7 5 Ω(RCA pi n ja ck)

50 0mVr ms( - 4dBs ), High

Im pe da nce ( RCA pin jack )

Y : 1V sync P rovide d, when ter m inat ed

wi t h 7 5Ω)

C : 0 .28 6V

ter m inat ed w it h 7 5Ω) 0～1 Vrms , Low Imp ed ance

(RCA pi n jack ×2)

RM-C54H (AV2 8C T1EPS) RM-C50 ( AV2 8CT1EP B)

-1. 5kV

p-p

PO SITI VE (Neg ativ e

p-p

(Burst signal, when

PA L / NTSC (Only in EX T mod e) PA L / NTSC (Only in EX T mod e)

FLOF ( Fast ext)

WST(Standard system)

32.9MHz ( 6.0MHz:I) 32.9MHz (6.0 MHz:I)

RM-C55 H (AV28CT1EI S) RM-C55 H (AV28CT1EKS)

Content

RM-C51 ( AV2 8CT1EK B)

De sign & sp eci f icat ions are subje ct to cha nge wi thout notice .

No.51952

V28CT1EKS / AV28CT 1EK

V28CT1EPS / AV28CT 1EP

V28CT1EI

■■■■21-pin Euro connector (SCART socket) : EXT-1 / EXT-2 / EXT-3

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

Signal Designation Matching Value EXT-1 EX T-2 EXT-3

No .

1 AUDIO R o ut put 50 0mVr ms( N ominal),

Low impedance

2 AUDIO R i n put 50 0m Vr ms( N ominal),

High i m pe da nce

3 AUDIO L output 50 0mVr ms( N ominal),

Low impedance

4 AUDIO GND ○○○

5 GND (B)

6 AUDIO L input 500mVrms(Nominal),

High i m pe da nce

7B input 700mV

8 FUNCTON SW

(SLOW SW)

9 GND (G)

10 SCL3 NC ○ NC

11 G in put 70 0m V

12 SDA3 NC ○ NC

13 GND (R)

14 GND (YS) ○ NC NC

15 R / C input R : 700mV

16 Ys i n put

17 GND(VIDEO outp ut) ○○○

18 GND(VIDEO input) ○○○

19 VID EO output 1V

20 VID EO / Y i np ut 1V

21 COM MON G ND ○○○

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

C : 300mV

Low : 0 - 0.4, High : 1 - 3V, 75Ω○

, 75Ω○NC NC

B- W

, 75Ω○NC NC

B- W

, 75Ω

B-W

, 75Ω

P- P

(Nega tiv e g oin g sync ), 75Ω○

P- P

(Nega tiv e g oin g sync ), 75Ω○ ○ ○

P- P

○

(TV OUT)

○○○

○

(TV OUT)

○○○

○

(only R)

(TV)

○

(LINE OUT)

○

(LINE OUT)

○

(only C)

NC NC

○

(LINE OUT)

○

(only C)

[Pin assignment]

No.51952

V28CT1EPS / AV28CT 1EPB

SAFETY PRECAUTIONS

1. The d es ign of th is product con ta ins sp ec ial har d ware , many circuits and components spe cially for safety purp oses. For con tinu ed pr ot ection , n o chan g es sh ou ld b e ma de to the orig inal d esi gn un l ess auth oriz ed in writi n g by th e ma nu fact urer. Replac em en t p arts m ust be ident ic al to thos e u sed in th e or i ginal

ci rcu it s. Serv ice s ho uld b e perfor med by qualif ied p ers on nel on ly.

2. Alte rati on s of t he desig n or cir cuitry of t he pr od ucts sh ould not be made. Any design alterations or additions will void the manufact ur er 's warrant y and will f urth er r eliev e t he ma nu factu r er

of r esp onsi b ility for per so na l injur y or p roperty dam ag e resul t in g th erefr om.

3. Many el ectr ical an d m echanica l p ar ts in th e pr od ucts ha ve special safety-related characteristics. T hese characteristics are oft en no t e v ident f r om v isua l i nsp ection n or ca n t he pr o tec t io n

aff or de d by th em nece ssar i l y be ob tain ed b y u s ing replacem en t com po ne nts ra ted f or hi g he r voltag e, w att ag e, etc. R ep l acement p arts whic h ha ve th ese sp eci al s afet y ch ar ac t er ist ics are ide ntified i n the parts list of Servic e m anual. El ectric al

components having such features are identified by shading on the sch e mat ic s and by ( manual. The us e of a substitute r ep la cem en t whic h do es n ot

h ave th e same saf ety ch ar act er ist ics as t he r eco mmen de d replac em ent part sh own i n th e p ar ts l i st of S er vi ce man ual may

cause shock, fire, or other hazards.

!!!!

) on the parts list in Service

4. Do n't short between the LIVE s ide ground and ISOLATED (NEUTRAL) s ide ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The diff er enc e of th e GND i s s ho wn b y th e LIV E : (") side GND , the

ISO LATED(NEUT RAL) : ( #) side GND and EARTH : ($) side GND. Don't sh ort b et ween th e LIV E sid e GN D and ISO LATED(NEUT RAL) side GND or EARTH side GND an d n ever m ea s ur e w it h a m ea suring a ppa r atus ( osc illos cop e etc.) th e LI VE si d e GND an d IS OLA TED (NE UTR AL ) s ide G ND or

EARTH side GND at th e s ame tim e. 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 s hou l d b e ch eck e d or adju ste d ( Se e

ADJUST MENT OF B1 POWE R SUPPL Y) .

6. The hi gh volta ge app lie d t o the pictu r e tu be mu st con form wit h th at s p ecified in S ervi ce manual. E xcessi ve high volt ag e c a n

cau s e an i ncr e ase i n X- R ay em i ssi on , ar c ing 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 occ ur s, r emove t he AC pow er immed i ate ly an d de ter m i ne th e c a use b y visua l insp ec t io n (inc or rect ins tal lat i on, cracke d or melte d high v o lt age har n es s,

p oor so lder i ng, et c.). To maint ai n the p roper min im u m le vel of sof t X-Ray em ission, c omponen ts in th e high vol tag e ci r cui try incl ud ing t he pi ct ur e tu be must be t he e xact r ep l aceme nts or alte rn at i ves ap pr ove d b y th e ma nuf act urer of th e c om pl et e product.

7. Do n ot c hec k high vol t age b y draw ing an ar c. Us e a high vol t age meter or a hi g h v oltag e pr ob e wit h a V TVM. Discharge th e picture tube before attempting meter connection, by connecting a cl i p lead to th e gr ou nd f ra me and c onn ec ti n g th e oth er end of

the lead through a 10kΩ 2W resis to r to the anod e butt on .

8. When s e r vice is r equ ired, ob serve th e origi na l lea d dr ess . Extr a prec aut ion sh ou ld b e g iven t o ass ur e corr ec t l ea d dr ess i n the

high vol tag e c ircui t a r ea. W her e a s hort ci r cuit h as oc cu rre d, th ose co mp on ent s tha t i ndi ca te evide nce of ove r hea ting sho ul d b e re plac e d. A lways us e th e ma nuf act ur er's r ep l acement components.

9. Isolation Check

(1) Di electric Strength Test

(2) Leakage Current Check

AV28CT1EPS / AV28CT1EPB

(Safety for Electrical Shock Hazard)

Af ter re- ass emb l in g th e pr odu c t, al w ays per f orm an i sol at ion ch ec k on the expo sed metal parts of t he c abin et ( a ntenn a ter m inals, video /audio inpu t and ou tput t erminals , C on trol kn obs,

metal cabi n et, scr ew he ad s, ea r ph one j ack, con trol s haf ts, etc.) to be s u re th e p roduct is s af e t o ope r ate with ou t dan ger of elect ri cal s hoc k.

The i solation be tw een the A C prim a ry c ircu i t an d al l me tal p ar ts exp osed t o th e us er , p arti cular l y any e xp osed met al p art having a

retu rn p ath to t he 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 hstan d a vo lt ag e of 1 10 0V A C (r .m. s.) t o an ap pl ianc e

rate d up to 12 0V , an d 3 00 0V AC ( r .m. s.) to an ap pl ian ce r at ed 200V or more, for a period of one second.) This meth od of test requi res a t est equi pmen t n ot gen erally found

in t he servic e trad e.

Plug th e A C line c ord direc t ly in to the A C ou tl et ( d o not use a lin e isol ati o n tr ansf or m er during this check .) . Usi n g a " Lea kag e

Curr ent T este r", me asur e th e lea kag e cu rre nt f rom each exp osed metal p art of the cabinet, p art icu larly any expos ed me tal p ar t h avi ng a re tur n path to the c h assis , t o a kn ow n go od ea rt h ground (water pip e, e tc.) . An y l eaka ge curren t m ust n ot e xceed

0.5mA AC (r.m.s.). Howev e r, i n tr op ic al area , th is must no t exce ed 0.2 mA AC

(r.m.s. ).

""""

Alternate Che ck M et hod

Plug th e A C line c ord direc t ly in to the A C ou tl et ( d o not use a lin e isol ati o n tr an s for m er dur ing t his che ck .) . Use an AC vo lt me ter h avi ng 1 00 0 ohms pe r volt or mor e s ens itivity i n th e fo llow i ng

manner. Con nec t a 1 50 0Ω 10W res ist or par a lle led by a 0 .1 5µF AC-type c apa citor bet we en an ex po sed met al pa rt a nd a kno wn

g ood e ar th gro un d (water pipe , etc.). M eas ure th e A C v o lt ag e acr oss th e r es ist or w i th th e AC vo ltm eter . M ove th e r esis tor con nec ti on to each exp ose d metal part, part ic ularly any exp osed metal p art havin g a retu rn pat h to t he chassis, an d m eas u r e th e AC vol tag e ac ro ss the r es ist or. No w , rev er se th e plu g in th e AC ou tl et and re pe at eac h mea s ur emen t. Any volt ag e me asured

must not exc eed 0.75V AC (r.m. s.). This c orre sponds to 0.5m A AC (r.m. s.). Howeve r, in tropical are a, this must not exceed 0.3V AC ( r .m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000 Ω /V,

OR MOR E SENSITIVITY)

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

No.51952

V28CT1EKS / AV28CT 1EK

V28CT1EI

SAFETY PRECAUTIONS

1. The design of thi s pro du ct c ont ains spe ci al hard ware and many circuits and components spe cially for safety purp oses. For

con tinu ed pr ot ection , n o chan g es sh ou ld b e ma de to the orig inal d esi gn un l ess auth oriz ed in writi n g by th e ma nu fact urer.

Replac em en t p arts m ust be ident ic al to thos e u sed in th e or i ginal ci rcu it s. Serv ice s ho uld b e perfor med by qualif ied p ers on nel on ly.

2. Alte rati on s of th e des ig n or ci rc uitr y of th e pr od uct sho uld no t be

made. Any design alterations or additions will void the manufact ur er 's warrant y and will f urth er r eliev e t he ma nu factu r er

of r esp onsi b ility for per so na l injur y or p roperty dam ag e resul t in g

th erefr om.

3. Man y elec tr i cal a nd me chanical p ar ts in the pr od uct h ave spe ci al saf ety- r elat ed ch ar act erist ics. Thes e characteri stics a re oft en not

evi d ent from visu al insp ec ti o n no r can th e p rotect i on af forde d by th em n ecess ar y be o bta in ed by usi ng replac em ent c om pon en ts rate d for hi gh er volta ge, wa tta ge , etc. R e pl acement p art s whic h

4. The leads i n the p rodu cts ar e r ou ted an d d r es sed wit h t ies,

AV28CT1EKS

/ AV28CT1E KB

AV28CT1EIS

h ave th ese spe c ial s af et y c har ac ter istic s ar e i d ent if ied in th e Pa rts Lis t of Serv ice Ma nu al . Elec tr i cal compon en ts h avi ng suc h

fe atur es are identifi ed b y sh adin g on the sche ma tic s and by (!) on t he Par ts List in the S ervi ce Manual. The u s e of a s ub stitut e

replac em ent w hi ch d oes no t h av e th e s am e saf ety ch ar ac ter i stic s as the re c om mend ed r eplace ment part sho wn in th e Par ts List of Se rvi ce Man ual may cause sh ock , fire, or ot her

hazards.

cl am ps, tu bi ng ’ s, b ar rie rs a nd t he like t o be s epa ra ted from live

p arts, high t emperature pa rts, m oving parts an d / or sh arp ed ges

for t he p reven ti on of e lectr i c sh oc k and fire h azar d. W he n ser vic e is r e quired , the or igin al le ad r outin g and d ress sh ould b e

ob ser v ed , and it sh oul d b e co nfi r m ed t hat th ey h ave bee n retu rn ed to no rm al , aft er re- as se mblin g.

WARNING

1. The eq uipme nt h as b ee n d esig ned a nd m anu fact ur ed to me et i nternatio nal saf ety sta nd ards.

2. It is t he leg al resp onsib ili ty o f th e re pa irer t o e nsure th at thes e safet y sta ndar ds are mai nt aine d.

3. Rep airs mu st b e m ad e i n acc ordan ce with the rele vant saf ety st an dar ds .

4. It is ess en ti al t hat saf ety cri ti cal c ompon ent s are replac ed by a pp ro ved part s.

5. If main s vol t age selec tor is p rovide d, ch eck s etti n g f or loca l vo ltag e.

No.51952

V28CT1EPS / AV28CT 1EPB

(

)

(

)

(

)

(

)

(

)

V28CT1EKS / AV28CT 1EKB V28CT1EIS

FEATURES

By pref er enc e, users can s ele ct th e pictur e size fr om REG UL AR ,

PANORAMIC, FULL, 14:9 ZOOM, 16: 9 ZOO M, 16 :9 ZOOM SUB

TITL E mod es. W he n th e TV u ni t r e ceived W SS pict ur e si gn al, th e pictu re can be ch an ged t o 16:9 ZOOM m ode autom atically.

" The T ELE TEXT S YSTE M has a b uilt - in FAS TEXT, TOP (On l y

AV 28CT1 EPS / EPB) an d W ST s ystem.

" Be c aus e th is T V un it cor r espon ds t o m ultiplex br oa dc a st, u sers

can enjoy music programs and sporting events with live realism. In ad di ti on , BI LIN GUAL programs can b e h ear d in th eir or i g in al

language.

TV EXT-1 EXT-3

EXT-2

Users can make VCR dubbing of picture and sound by controlling

th e AV s elec tor to se lec t an optiona l so urc e at th e EXT- 2 outp ut

sh own in figu re.

EXT-4

MAIN DIFFERENCE LIST

Model Name

!!!!

Part Name

MAIN PWB SJK-1716A-U2

AV SEL. PWB SJK0S712A-H3 ← SJK0S912A-H3

FRONT CABINET ASSY

POWER CORD QMPK160- 185- JC QM PN130-185-JC ←

RATI NG LABEL

EURO LABEL

INST BOOK

REM OTE CO NT ROL UNI T

S. DIAGRAM ONLY ITALY(SERVICE)

AV28CT1EPS / EPB AV28CT1EIS AV28CT1EKS / EKB

LC10001-006C-U

LC10001-007B-U (EPB)

LC11415-001A-U LC11415-002A-U (EPB

AEM1064-014-E (EPS) AEM1064-015-E (EPB)

LCT1137- 001A- U LCT1136- 001A- U (EPB

RM-C54H-1C (EPS)

RM-C50-1C (EPB)

28CT1EP-HSA-E

EPS

←

LC10001-006C-U

LC11372-003A-U

AEM1064-013-E

LCT1138- 001A- U LCT1138- 001A- U

RM-C5 5H- 1C

××

EPS

SJK-1916A-U2

LC10001-006C-U (EPS LC10001-007B-U (EPB)

LC11364-005A-U LC11364-006A-U (EKB

AEM1064-011-E (EKS) AEM1064-012-E (EKB)

RM-C55H-1C (EKS)

RM-C51-1C (EKB)

EKS

No.51952

V28CT1EKS / AV28CT 1EK

V28CT1EPS / AV28CT 1EP

SPECIFIC SERVICE INSTRUCTIONS

REPLACEMENT OF CHIP COMPONENT

! CAUTIONS

1. Avoid heating for more than 3 seconds.

2. Do n ot rub t he el ect rodes an d the resis t p arts of the p att ern.

3. When removi ng a c hip part, mel t the s older ad equ atel y.

4. Do n ot reuse a ch ip p art afte r removi ng it .

! SOLDERING IRON

1. Us e a hi g h ins ulati o n s older i ng i r on with a t hin po in ted end of it .

2. A 3 0 w s oldering ir on is r ec ommend ed for easi l y r emovi ng par ts .

REPLACEMENT STEPS

1. How to remove Chip parts

####

Resi st ors, ca pacit ors , etc

(1) As sh own in the f igure, pu sh th e pa rt with tw ee zers and

alte rn at el y m el t the sol de r at each en d.

(2) Sh if t w ith tw eeze rs and r em o ve th e ch ip p ar t.

#### Trans isto rs, dio des, va ria bl e r esistors, et c

(1) Ap ply e xt ra so lder to ea ch lead .

SOLDE R SOLDE R

2. How to install Chip parts

####

Resi st ors, ca pacitors , et c

(1) Ap ply sold er to th e pattern as ind ic ated in the fi gure.

(2) Gr asp t he ch ip p art with twee zers and pl ac e it on th e s old er.

The n hea t and melt th e so lder a t b oth en ds of t he chip part.

#### Trans isto rs, diodes , varia bl e r es ist or s, et c

(1) Ap ply sold er to th e pattern as ind ic ated in the fi gure. (2) Gr asp th e chip p art w it h twe eze rs and p lace it on th e so lder.

(3) First solder lead A as indicated i n t he figure.

V28CT1EI

(2) As sh own in the f igure, pu sh th e pa rt with tw ee zers and

alte rn at el y m el t the sol d er at eac h le ad . Shi ft and remove the chip part.

(4) Then so lder le ads B and C.

Note : A fte r re moving the part, r emove remain ing so lder fro m the

pattern.

No.51952

V28CT1EKS / AV28CT 1EKB

V28CT1EPS / AV28CT 1EPB V28CT1EIS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unp lug t he powe r c ord.

2. Remove the 14 screws marked“

3. Withdr a w t he rear co ver to wa rd you .

REMOVING THE CHASSIS

After removing the rear cover.

1. Sli ght ly rai se th e bo th si de s of th e c hass is by h and and re mo ve

th e tw o claws u nd er th e b oth s id es of the chassis fr om t he front cab inet .

2. Withdr a w t he chass is backward. (If n ecessary, take off the wire clamp, conne ctors etc.)

REMOVING THE AV TE RMINAL BOARD

" After removing the rear cover.

1. Remove the 2 scr ew s mar ked“

2. Remove the claws marked “

shown in Fig. 2.

3. Remove th e to p of t he A V TE RMINAL BOA RD slight ly in th e

direc ti o n of arr ow “

” as sh own in Fi g. 2 .

$$$$

”as sh own i n t he F ig. 1.

!!!!

”as sh own in th e Fig. 1.

""""

” u nde r the C H ASS IS as

####

AV TERMINAL BOARD

REMOVING THE SPEAKER

After removing the rear cover.

1. Remove the 2 scr ew s mar ked“

2. Fol low th e s ame st eps when removi ng th e other ha nd speake r.

”as shown in Fig. 1.

%%%%

CHECKING THE PW BOARD

To c h eck the b ack side of th e PW B oard.

1) Pull out the ch assis . ( Refe r to RE MOVING TH E CH ASSIS).

2) Erect the c hassis vertically so that you can easily check the

b ack si de of th e PW B oard.

[CAUTION] " When e recting the chassis, be careful s o that there will be no

contacting with other PW Board.

" Be for e turning on po wer , make sure t ha t the w i re c o nn ec to r i s

properly connec ted.

W hen co ndu cting a ch eck w ith p ow er su ppli ed , b e sure to c onfir m

th at t he CRT E ART H WI RE (B RA ID ED AS S’Y) is co nne cted t o

th e C RT SOCKE T PW b oar d.

WIRE CLAMPING AND CABLE TYING

1. Be sure t o cla mp the wir e.

2. Never r em o ve th e c able tie used f or ty ing th e w i res toge the r.

Sh ould it be in adve rt ent l y rem oved, b e sure to ti e th e wi res w it h a n ew c able ti e.

AV SE L PWB

Fig . 2

No.51952

FRONT CABINET

CRT SOCKET

PWB

V28CT1EKS / AV28CT 1EK V28CT1EPS / AV28CT 1EP

V28CT1EI

SP EAKER

AV SE L . P WB

POWER & DEF. PWB

CLAW

C ONT RO L BASE

REAR COVER

FRONT CO NTROL PWB

MAIN PWB

CHAS SIS

AV TERMINAL BOARD

CLAW

Fig . 1

No.51952

V28CT1EKS / AV28CT 1EKB

V28CT1EPS / AV28CT 1EPB V28CT1EIS

REMOVING THE CRT

∗

Replac em en t of the CRT sho ul d be per formed b y 2 or mor e

p ers ons.

• After removing the cover, chassis etc.,

1. Pu tting the CR T c han ge ta ble o n sof t c loth , th e CRT cha ng e ta ble

sh ould al so b e c over ed w ith s uch soft clot h (sho wn in Fi g. 5).

2. While k ee pi n g th e surf ac e of CRT dow n , m ou nt the TV s et on t he

CRT change table balanced will as shown in Fig.6.

3. R em ove 4 s c rews mark e d by arro ws with a box typ e scr e w dr iver

as s hown in Fig. 6.

• Si nc e th e cab inet w ill dr op wh en scr ew s h ave b een remo ved, be

sure t o su pport t he cabinet with h ands.

4. After 4 screws have been removed, put the cabinet slowly on

cloth (At th is time, be carefully so as not to damag e the front

sur fac e of th e c abin et) sh own in Fig.7 .

• The CR T sh ould b e ass em bled acc or ding to th e opp osi te sequence of its dismounting steps.

∗

T he C RT chang e t able sh ould pr ef erab ly b e small er t hat th e CRT

sur fac e, and its height b e about 35c m.

CRT CHANGE TABLE

AP PROX. 35 cm

CLOTH

Fig. 5

CRT

CRT CHA NGE TABLE

BOX TYPE

SCREW DRI VER

COATING OF SILICON GREASE FOR EL ECT RICAL INSULATION ON THE CRT ANODE CAP SECTION.

•

Subs e qu ent to re pl ac ement of t he C RT an d HV tr an sfor m er o r

repair of t he an od e cap, etc. by d is mount i ng the m, be sure to coa t si lic o n g rease for electric al ins u l ati o n as sh ow n in Fig.8 .

W ipe a r oun d t he an ode b utt on with cl ea n and dry c lot h. (F i g. 8)

Coat si l ic on greas e on t he sect ion arou nd th e a no de bu tt on. At

this time, take c are so that any silicon greases dose n ot stic k to the ano de button . (F ig.9 )

★★★★

Silicon grease product No. KS - 650N

CRT

An od e b utton

Silic on greas e

coating

CABINET

Ap prox. 20mm (Do not coat grease on this s ection

An od e b utton (No s ti cki ng of silicon grease)

Fig. 6

CRT

CRT CHANGE TA BLE

Fig. 7

Silic on greas e sh oul d be coa ted b y 5mm or m or e

fr om th e outs id e diameter of an od e c ap.

Coat ing posi t io n of silico n gr eas e

An od e ca p

Fig. 8 Fig. 9

No. 51952

+ 22 hidden pages

JVC AV28CT1EIS, AV28CT1EKB, AV28CT1EKS, AV28CT1EPB, AV28CT1EPS Service Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

SAFETY PRECAUTIONS

WARNING

FEATURES

MAIN DIFFERENCE LIST

SPECIFIC SERVICE INSTRUCTIONS