JVC AV28CH1EUB, AV28CH1EUS Service Manual

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SERVICE MANUAL

COLOUR TELEVISION

AV28CH1 EUS AV28 CH1 EU

BASIC CHASSIS

AV28CH1EUS AV28CH1EUB

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

SAFETY PRECAUTIONS

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

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

SPECIFIC SERVICE INSTRUCTIONS

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

PARTS LIST

★

STAND ARD CIRCUIT DIAGRAM

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

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

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

････････････････････････････････

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

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

･･･････････････････････････････････

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

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

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

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

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

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

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

････････････････････････････････

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

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

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

･････････････････････････････ 2

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

････････････････････････････････････

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

･･･････････････････････

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･･･ 5

･･････

･･･････････････････････ 5

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

･････････････

･･････････････････････････

･････････････････････ 12

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

････････････････

････････････････････････････････

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No.519 44 Mar. 2002

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V28CH1EUS

V28CH1EUB

SPECIFICATIONS

Item

Dimensions ( W××××H××××D ) 72 5mm×4 80m m×496mm Mass 34 .7 kg

TV RF System

Colour Sy stem PA L / SECA M / NT SC (Only i n EXT mode)

Stere o Sy st em A2 (B /G,D/K)/ NICAM(B/G,I ,D/K,L)

Teletext System FLOF (Fastext)

Receiving Frequency

Interme diate Fr equenc

VIF Carrier 38 .9 MHz ( B/G , I ,L)/ 3 3.9 5 MHz (L’)

SIF Carrier 33 .4 MHz ( 5.5MHz :B/ G) / 32.9MHz (6.0 MHz:I ) / 32.4MHz (6.5MHz:L , D/K) / 40 .45MHz (6.5MHz:L’ )

Colour Sub Carrier Fr eq.

SE CAM 4.40625MHz/4.25MHz

Power Input AC 2 30V , 50Hz Power Consumpti on

CCIR (B/G,D/K, I ,L, L ’)

TOP (German syst em) WST(W orld Standard system)

VHF 47 MHz ～ 47 0MHz

UHF

470MHz ～ 8 62MHz

PAL 4.43MHz

NT S C 3.58MHz / 4.43MHz

16 5W ( Max) / 112W(Avg) , sta ndby : 2.8W

AV28CH1EUS / AV28CH1EUB

Content

Aerial Input Term

Pictur e Tube

Hi gh Vo lt ag e

Speake r

Au dio Output 5W + 5W

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

S / Video

EXT-4 (Input) Video

Au di o (L /R )

S / Video

AUDIO OUT (Vari able)

Headphone jack St ereo mi n i jac k (φ3.5mm )

Remote Control Unit RM-C 54 H (AAA/R 0 3 dr y batte ry×2) : (A V2 8CH1EUS) / R M-C50( AAA/R03 d r y bat tery×2 ) : (A V2 8CH1EUB)

75 Ωun ba l anc ed, C oaxi al

Visi ble si ze : 66 cm, Meas ured di a gon al l y

1kV

30.0kV (at zero beam current)

-1. 5kV

(10c m×3cm) ov al typ e ×2

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

p-p

Y : 1V

C : 0.3V

1V p- p 7 5Ω(RCA pi n jack)

50 0mVr ms( -4dB s ), H igh Impe dan ce ( RCA pin jack )

Y : 1V

C : 0.3V

0～1 Vrms, Low Imp ed ance (RCA pi n jack ×2)

POSITIVE (Negative sync Provided, when terminated with 75Ω)

p-p

(Burst signal, when terminated with 75Ω)

p-p

POSITIVE (Negative sync Provided, when terminated with 75Ω)

p-p

(Burst signal, when terminated with 75Ω)

De sign & sp eci ficatio ns ar e su bje ct to change wi thou t no t ice .

No.51944

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V28CH1EUS

V28CH1EUB

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

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

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

No .

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

Low impedance

2 AUDIO R input 50 0mVr ms( N ominal),

High i m pe da nce

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

Low impedance

4 AUDIO GN D ○○○

5 GND (B)

6 AUDIO L input 500mVrms(Nominal),

High i m pe da nce

7B input 700mV

8 FUNCTION 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 output) ○○○

18 GND(VIDEO input) ○○○

19 VID EO output 1V

20 VIDEO / Y inp ut 1V

21 COMMON GN D ○○○

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

C : 300mV

Low : 0 - 0.4, High : 1 - 3V, 75Ω○

, 75Ω○○NC

B- W

, 75Ω○○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)

○

NC NC

○

(LINE OUT)

○

(only C)

[Pin assignment]

No.51944

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V28CH1EUS

V28CH1EUB

SAFETY PRECAUTIONS

1. T he design of th is pr od uc t con ta in s sp eci al hard ware, many circuit s and components specially for safety purposes. For con tinu ed pr ot ection , n o chan g es sh ou ld b e ma de to the o ri g 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 p er for m ed by qu al if i ed p ers on nel on ly.

2. Alte r ati on s of the design or ci r cui try of t he prod 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 r op er ty d am ag e r esult ing th erefr om.

3. M an y e lectric al and mech ani ca l parts i n th e prod ucts ha ve special safety-related characteristics. These 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 sin g r ep l acement com po ne nts ra ted f or hig he r vol tage, watt ag e, etc. R ep l acem en t 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 manua l. El ec tric al

components having such features are identi fied by shading on t he sche mat ic s an d by (

manual. The us e of a sub s ti tu te rep lacem en t whi ch does 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 lis t of S er vic e man ual may

cause shock, fire, or other hazards .

!!!!

) on the parts list in Service

4. Don't shor t between the LIVE side ground and ISOLATED (NE UTRAL) 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 th e GND i s s ho wn b y th e LIV E : (") side GND , the

ISO LATED(NEUT RAL) : (#) si de GND and EAR T H : ($) 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 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 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 v olta ge app li e d t o th e pictu re tu be mu st confor m with 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 vo ltage har n ess,

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- R ay emi ssi on, c omp on en ts i n th e hi gh v oltag e cir c uitr y 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 not c hec k high volt age b y dr awing 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 ectin g th e other end of

the lead through a 10kΩ 2W resi sto r to the anod e b utt on .

8. When se rvice i s require d, ob ser ve th e or i gina l lea d dress. E x tr 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 r e pl ace d. A l wa ys u se th e ma nuf act urer's r ep l acem en t components.

9. Isolation Check

(1) Dielectric Strength Test

(2) Leakage Current Check

(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 iso l ati on be tween the AC pr imary ci rcuit an d all metal parts exp osed t o th e us er , p arti cular l y any e xp os ed 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 hs tan d a v o lt ag e of 1 10 0V A C (r.m. s.) t o an applianc 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 equ ipment n ot g enerally found

in t he servic e trad e.

Plug th e A C line c ord d irect ly into th e AC ou tlet ( d o not use a line isol ati o n tr ansf or m er du r in g thi s ch eck.). Usi n g a " Lea kage 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 own 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 d irect ly into th e AC ou tlet ( d o not use a line isol ati o n tr an s for m er dur ing t hi s che c k.). U se an AC vo lt me ter h avi ng 1 00 0 ohms pe r volt or mor e s ens itivi ty in th e fo ll owing

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 cit or bet ween an expo sed 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 volt ag e acr oss th e res ist or w ith th e AC vo ltm eter . Move th e r esis tor con nec ti on to each exp ose d metal part, part ic ularly a ny exp os ed metal p art havin g a retu rn pat h to t he ch as sis , an d m easu re th e AC vol tag e ac ro ss the res ist or . No w, re vers e th e pl u g i n th e AC

ou tl et and re pe at eac h mea s ur emen t. Any volt ag e me asured must no t e xceed 0 .75V AC (r.m. s.). This c orre spo nds to 0.5mA AC (r.m. s.). Howeve r, in tropica l are a, this must n ot exceed 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

No.51944

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FEATURES

V28CH1EUS V28CH1EUB

New c hass is d es ign ena bl e us e of an i nte rac ti ve on screen

control.

The TELETEXT SYSTEM has a built-in FASTEXT (UK syst em),

TOP (Germ an syst em) and W ST (world standard system) system.

Be c aus e th is T V un i t cor r esp on ds t o m ultiple x br oa dc a st, u s ers

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 i n fi gu re.

EXT-4

MAIN DIFFERENCE LIST

Model Name

Par t Name

FRONT CABINE T ASSY LC 10001- 008C- U LC 1000 1-00 9B-U

DOOR LC 20 00 1-01 0A-U LC 20 00 1-01 2A-U

POWER KNOB LC 30 10 4- 01 0A -U LC 30 10 4- 01 2A -U

RE A R COVER LC 10 03 -0 09 B- U LC 10 00 3- 01 0B -U

JV C MA RK LC 40 35 4- 00 3A -U LC 40 35 4- 00 1C-U

RATING L ABEL

LC 114 14 -001A -U

EURO LABEL AEM1064-009-E AEM1064-010-E

REMOTE CONTROL UNIT RM-C54H-1C RM-C50-1C

AV28CH1EUS AV28CH1EUB

LC 114 14 -002A -U

No.51944

Page 6

V28CH1EUS

V28CH1EUB

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug t he po wer c or d.

2. Remove the 14 screws marked

3. Withdra w t he r ear cover to wa rd you .

REMOVING THE CHASSIS

After removing the rear cover.

1. Sl i ght ly r aise the bo th side s of th e c hass is by h and and re mo ve

th e tw o claws u nd er th e both sid es of the ch assis fr om t he fro nt cab inet .

2. Withdra w t he chass is back wa rd .

(If necessary, take off the wire clamp, co nnectors etc.)

REMOVING THE AV TERMINAL BOARD

" After removing the rear cover.

1. Remov e th e 2 s cr ews m ar ked

2. Remove the claws marked

Fig. 2.

3. Slight ly in t he di re ction of ar r ow

####

as sh own in th e Fig. 1.

!!!!

as sh own in th e Fig. 1.

""""

un der t he CHAS SIS as sho wn in

as sh own in Fi g. 2.

$$$$

AV TERMINAL BOARD

REMOVING THE SPEAKER

" After removing the rear cover.

1. Remov e t he 2 s cr ews m ar ked

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

as sh own in Fi g. 1.

%%%%

CHECKING THE PW BOARD

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

1) Pu ll out the chassis. (R efer to RE MOV ING THE CHAS SIS ).

2) Erect the chassis vertically so that you c an easily check the

b ack si de of th e PW B oard.

[CAUTION]

When erecting the chassis, be careful s o that there will be no

contacting with other PW Board.

Be for e turning on po wer, ma ke s ur e t ha t the wi re co nn ector is

properly connec ted.

W hen condu cting a ch eck w ith p ow er su pplied , b e sure to c onfi r 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 to cla mp th e wire.

2. Never r emo ve th e c able tie use d f or ty ing th e wires to gether.

Sh ould i t be i n adve rt ent l y remov e d, b e su re to ti e th e wires w it h a n ew c able ti e.

AV SE L PWB

Fig . 2

No.51944

Page 7

FRONT CABINET

CRT SOCKET

PWB

FRONT C ONT RO L PWB

MICON PWB

10 0Hz PW B

V28CH1EUS V28CH1EUB

PEAKER

POWER & DEF. PWB

C ONT RO L BASE

REAR COVER

MAIN PWB

CLAW

AV SW PWB

CLAW

FBT

CHASSIS

AV TERMINAL BOARD

Fig . 1

No.51944

Page 8

V28CH1EUS

V28CH1EUB

REMOVING THE CRT

∗

Replac em en t of th e CRT sho uld be p er for m ed by 2 or more

p ers ons.

• After removing the cover, chassis etc.,

1. Putti ng th e CR T c hange tabl e o n sof t cloth , the CRT chang e ta ble

sh ould al so b e c over ed w ith s uch soft clot h (sho wn in Fi g. 3).

2. W hile kee pin g th e surf ac e of CRT down , m ou nt the TV s et on t he

CRT change table balanced will as shown in Fig.4.

3. R em ove 4 sc re ws mar ke d by arro ws with a b ox typ e scr e w driver

as s hown in Fig. 4.

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

sure t o su pport t he cab inet with hands.

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

cloth (At this time, be ca refully so as not to damage the front

sur fac e of th e c abin et) sh own in Fig.5 .

• The CRT s h oul d b e ass em bl ed accor di n g to the o pp osite sequence of its dismounting steps.

∗

The CRT cha ng e t able sh ould pref er ab l y be sm al ler t hat the CRT

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

CRT CHANGE TABL E

AP PROX. 35 cm

CLOTH

Fig. 3

CRT

CRT CHANGE TABLE

BOX TYPE

SCREW DRI VER

COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.

•

Su bs 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 ca p, etc. by dis mount i ng the m, be sure to c oa t si lic o n g re ase fo r el ectric al insu latio n as sh ow n in Fig .6.

W ipe a roun d t he an ode b utton with cl ea n and dr y cl ot h. (F ig. 6)

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 care so t hat any silicon greases dose not stick to the ano de button . (F ig.7 )

★★★★

Sil icon 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 section

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

Fig. 4

CRT

CRT CHANGE TA BLE

Fig. 5

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

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. 6 Fig. 7

No. 51944

Page 9

REPLACEMENT OF CHIP COMPONENT

! CAUTIONS

1. Avoid heating for more than 3 seconds.

2. Do n ot rub t he elect rodes an d t he r esis t p ar ts of the patt ern.

3. When r emovi ng a c hip part, mel t th e s older ad equate ly.

4. Do n ot reuse a chip part after removi ng it .

! SOLDERING IRON

1. Us e a hi g h i ns ulati o n solder ing iron with a t hi n po in ted end of it.

2. A 3 0 w s older ing iron is rec omm end ed for easil y remov ing p ar ts .

REPLACEMENT STEPS

1. How to remove Chip parts

####

Resi st ors, ca pacit ors , etc

(1) As s h own in t he f ig ur e, pu s h th e pa rt with tw ee zers and

alte rn at el y melt th e s older 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.

#### T ran s ist ors, diodes , varia bl e resist or s, etc

(1) Ap ply e xt ra solder to ea ch le ad.

SOLDE R SOLDE R

V28CH1EUS V28CH1EUB

2. How to install Chip parts

####

Resi st ors, ca pa cit ors , etc

(1) Apply solder to th e patter n as ind icated in the figure.

(2) Gr asp t he ch ip p art with tw ee 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.

#### T ran s istors, dio des, va ria bl e r esistors, et c

(1) Apply solder to th e patter n as ind icated in the figure. (2) Gr asp th e chip part with t we ezers an d pl ace it on th e solder.

(3) First solder lead A as indicated in the figure.

(2) As s h own in t he f ig ur e, pu s h th e pa rt with tw ee zers and

alte rn at el y melt th e sold er a t each l e ad . Shift an d r em ove t he chip part.

(4) The n so lder le ads B and C.

Note : A fte r re movin g t he part , remove remain ing so lder from the

pattern.

No.51944

Page 10

V28CH1EUS

V28CH1EUB

REPLACEMENT OF MEMORY ICs

1. Memory ICs

This TV use memory ICs. In the memory ICs, there are memorized data for cor r ectl y op erating th e video an d def l ection cir cu its . Wh en r ep l aci ng

memory IC s, b e s ure t o us e IC s wri tte n with th e initial values of da ta.

2. Procedure for replacing memory ICs

PROCEDURE

(1) Power of f

Switch the p ower of f and un plug th e pow er cor d fro m t he ou tlet.

(2) R epla ce IC s.

Be sure to use memory ICs written with the initial data values.

(3) Powe r on

Plug th e p ower c ord i nt o the outlet a nd swit ch t he po we r on .

(4) Check and s et SY STEM CO NSTANT SET :

****

It must not adjust without sig na l.

1) Pr ess th e INFORMAT I ON ke y an d th e MU TING key of th e REMO TE CONTROL UNIT simultaneous ly.

2) The SERVICE MENU screen of Fig. 1 will be displayed.

3) W hi le th e S ERVIC E ME NU is d is played, pr es s th e INFORMATION key and MUTING key s imultaneously, and the

SYSTEM CONSTANT SET screen of Fig. 2 will be displayed.

4) Check th e se tting va lues of the S YSTEM C ON ST A NT SET of

Table 1. If the value is d if fere nt, se lect the s ettin g item with th e FUNCTION U P/ DOWN key, and s et the correct va lue with the FUNCTION - /+ ke y.

5) Press the MENU key to memorize the setting value.

6) Pr ess t he IN FORMATION ke y t wice, a nd r etu rn t o th e normal

screen.

SE RV ICE MEN U

1. IF 2. V/C

3. A UDI O 4. D EF

5. VSM P RESET 6. S TATUS

7. P IP 8. 　---

9. SHIPPING (OFF) 0. BUS FREE

1 -9 : SE LE CT

SY STE M CON ST ANT S ET

1. DESTINATION EU

- /+ : STORE i : EXIT

Fig.1

Fig.2

: EXI T

NAME OF REMOTE CONTROL KEY

(5) Se tt in g of re cei ve chann e ls

Names of key

ke y

Se t the rec eive c h an ne l.

For setting , ref er to the OPE RATING IN S TRUC TIONS.

(6) U ser se tting s

INFORMATI ON

MU T I N G

iiii

Check th e us er sett in g values of Tab le 2, and i f sett in g value is diff er ent , set the c orr ec t val u e.

For setting , ref er to the OPE RATING IN S TRUC TIONS.

(7) Setting of SERVICE MENU

Ve rif y the set ti ng it ems of th e SER VIC E ME NU of Tab le 3, an d rese t

ME NU

FUNCTION UP/ DO WN

▼

where n ecessary. For setting , ref er to the SE RVICE ADJUSTM ENT S.

FUNCTION -/+

▼

No. 51944

Page 11

SETT I NG VALU ES OF SYST EM CONS TANT SE T (TABLE 1)

V28CH1EUS V28CH1EUB

Setting item Setting content Setting value

16 :9

EKEU EI

4:3

YE SNO

YE S

2TUNER1TUNER

YE S

DESTIN A TION EU DOLBY NO

CRT TYPE 16:9 BB E NO

PURITY NO PROGRESSIVE NO

PICTURE TILT NO TDA9178 NO

DIGIP URE PRO NO TONE IC NO

PIP NO F LAT NO

PIC&TE XT NO

Setting item

Setting content Setting value

YE SNO

YE S

YE SNO

YE S

USER SETTING VALUES (TABLE 2)

PICTURE SE TTING EX T SET TI NG

TINT COOL

CONTRAST / BRIGH T SHAR P / COLO UR

PICTURE FEATURES FEATURES

DIGITAL VNR AUTO

Digipure PRO AUTO

COLO UR S YST E M TV : Acco rd in g t o pr eset C H

4:3 AUT O ASPE CT PA NO RAMIC

SOUND SET TING INSTALL

BA SS / TREBL E / BA LANCE LANGUAGE ENGLISH

HYPER SOUND OFF EDIT/MANUAL PRESET CH only

REFER to VSM PRESET

EXT : AUTO

CENTER

ID S-IN DUBBING

SLEEP TIMER BLUE BA CK

BLANK BLANK

EXT- 1→EX T-2

OFF ON

The others : BLANK

SERVICE MENU SETING IT EMS (TAB LE 3)

Setting item Setting value Setting item Setting value

1. IF 1. VCO

2. ATT ON /OFF

2. V / C 1. RGB BLK

3.A UD IO

(Do not adjust)

9.S HIPPI NG

(Do not adjust)

2. W D R R

3. W D R G

4. W D R B

5. BRIGHT

6. CONTRAST

7. COLO UR

8. HUE

9. SHAR P

10. VC O A DJ .

1. ER R LI MIT

2. A2 ID THR

ON/OFF

4. DE F. 1. V- SH IF T

5. VSM PRESET COOL

NORMA L WARM

6.S TATUS

(Do not a dju st)

No. 51944

2. V-SIZE

3. H-CENT

4. H-S IZE

5. TR APE Z

6. EW - PIN

7. COR-P IN

8. COR-UP

9. COR-LO

10. ANGLE 11 . BOW

12. V-S.CR 13 . V- LIN

1. CONT.

2. BRIGHT

3. SHAR P

4. COLO UR

5. HUE

6. W D R R

7. W D R G

8. W D R B

VP S PDC

Page 12

V28CH1EUS

V28CH1EUB

SERVICE ADJUSTMENTS

BEFORE STARTING SERVICE ADJUSTMENT

1. There ar e 2 w ays o f adjusting this T V: On e is wi th t he

REMOTE CONTROL UNI T and the other is the conventional

method using adjustment parts and components.

2. The setting (adjustment) us ing the REMOTE CONTROL

UNIT is made on the basis of th e init ial setting values. The se tting va lues which adj u st the scree n to t h e opt imum

condition can be different from the initial setting values.

3. M ak e s ure th at c onn ect i on is c orrect ly ma de t o AC p ow er

source.

4. T ur n on th e pow e r of th e TV a nd m easu ring ins tr um en t for

warmi n g u p for at l east 30 minut es b ef ore sta rt ing adju stment .

5. If th e r ec eive or i np ut si g nal is not speci fi ed , use t he m ost

ap prop riate s igna l f or a dj ust ment.

6. N ever tou ch parts ( s uch as variab le res ist ors, transform er s an d condensers) not shown in the adjustment items of this service

adjustment.

7. Prep ar ati o n f or ad j ustmen t ( pr es ettin g) : Unles s oth er wis e speci fi ed i n the a djust ment it em s, p r eset th e

follo win g funct ions with th e REMOTE CONTROL UNI T.

Setti ng posit ion

PICTURE MODE (VSM) NORMAL

SLEEP TIMER OFF

TONE BALAN CE CENTER

ZOOM PANORAMIC

MEASURING INSTRUMENT AND FIXTURES

1. DC voltmeter (or digital voltmeter)

2. Oscilloscope

3. Si gn al gener at or (Patt ern gener at or) [ PAL / SE CA M / NT SC]

4. Remote control unit

ADJUSTMENT ITEMS

●

Check ing i t ems.

●

Adjustment of FOC US & SCREEN

●

VS M p r eset ad ju st s ettin g.

●

VIDEO / CHROMA circ uit adjustment.

●

DEFLECTION c ircuit adjustment.

●

AUDIO circuit adjustment. (Do not adjust)

No. 51944

Page 13

ADJUSTMENT LOCATIONS

(

)

V28CH1EUS V28CH1EUB

FRON T

FRONT CONTROL PWB

F90 1

POWER SW

CN001

FRON T

MAIN PWB POWER&DEF PWB

CN002

AV SEL PWB

CN006

IC702

MEMORY

100Hz PWB

IC701

SP R

SP L

FRON T

W DEG

TUNER

CRT SOCKET PWB

T P- 47R

T P- 47G

CN013

TP-E

MIC OM PWB

CN008

SOLDER SIDE

T P- 47B

CN009

TOP

CN014

HVT

FOCUS1 FOCUS2

SCREEN

1pin:B1( TP-91) 2pin:NC

3pin:NC 4pin:NC 5pin:GN D

No. 51944

Page 14

V28CH1EUS

V28CH1EUB

BASIC OPERATION SERVICE MENU

1. TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

2. SE RVICE MENU ITEMS

With the SERVI CE M EN U, var i ou s sett in gs ( ad jus tm en ts) c an b e m ade , a nd th ey a re b r oad l y c lass if ied in th e f ol l owing items of s et tings

(adjus tm ents ): (1) 1. IF ･･･････････････････････ This m ode adjust s the se tting values of the IF circui t.

(2) 2.V /C ･･････････････････････ T his m ode adjusts th e setting valu es o f th e VIDEO / CHROMA ci rcuit. (3) 3.AUDIO･･･････････････････ This mode adjusts the setting values of the multiplic ity SOUND circuit.

(4) 4. DEF ･････････････････････ This m od e adjust s th e setti ng values o f the DE FLECT ION c ircui t f or eac h as pect m od e g i ven be low.

FULL (100/120Hzi)

PA NO RA MIC ( 1 00 /12 0 H z i )

SUBTITLE (100/120Hzi) COMP RESS (Fix ed val u e) (100/1 20H zi)

(5) 5.V SM PRESE T

(VSM : Video Status Memory)

3. BASIC OPERATION OF SERVICE MENU

(1) Ho w to enter SERVICE MENU

Press the INFORMATION key a nd the MUTING key of t he

REMO TE CONT RO L U NI T si mu lt an eou s ly, an d th e

SERVICE MENU screen of Fig. 1 will be displa yed.

(2) Selection of SUB MENU SCREEN

Press one of keys 1～5 of the REMOTE CO NTROL UNIT

an d sel e c t th e S UB M ENU SCR EEN ( See Fi g. 3 ), fo rm th e

SERVICE MENU.

SERVICE MENU → SUB MENU

･････････････

1. IF

2. V / C

3. AUDIO

4. DE F.

5. VS M PRESE T

6. STATUS

7. PI P

8. ---

9. SHIPPING(OFF)

0. BUS FREE

Thi s mode adjust s th e in itial s ett ing va lues of COOL, N ORM AL an d WAR M .

SE RVICE M ENU

SE RV ICE MEN U

1. IF 2. V/ C

3. AU DIO 4. DE F

5. VS M PRESET 6. ST ATUS

7. PI P 8. -- -

9. SH IPPING ( OFF) 0. BU S FREE

1 -9 : SE LE CTi : EXI T

Fig.1

NEME OF REMOTE CONTOROL KEY

Names of ke

INFORMATI ON

MU T I N G

ME NU

Do no t W o rk

FUNCTION UP/ DO WN

FUNCTION -/+

Fig.2

iiii

▼

No. 51944

Page 15

SERVICE MENU

SERVICE ME NU

1. I F 2. V /C

3. AUDIO 4. DEF

5. VSM PR ESET 6. STAT US

7. PIP (OFF) 8. - - -

9. SHIPPING (O FF) 0. BUS FREE

1-9 : SELE CT : EX ITi

V28CH1EUS V28CH1EUB

1. V- SH I F T

2. V- SI Z E

3. H-CENT

4. H-SIZE

5. TRAPEZ

6. EW -PIN

7. COR PIN

8. COR-UP

9. COR-LO

10. A NGLE

11. B OW

12.V- S.CR

13.V-LIN

DE F *** Hz FUL L

1. V- SHI F T

: STORE i : EXIT

- / +

4. DEF

***

1.IF(VCO)

IF SER VICE M E NU

1. VCO

2. ATT O N/O FF

1-2 : SELECT i : EXIT

2. V/C

V/C

PAL

1. RGB_BLK

- / +

: STORE i : EXIT

****

Do no t move

1. RGB BL K

2. WDR R

3. WDR G

4. WDR B

5. BRIGHT

6. CONT RAST

7. COL OUR

8. HUE

9. SHA RP

10. VCO ADJ

COOL NORMAL

WARM

1. CONT .

2. BRIGHT

3. SHA RP

4. COL OUR

5. HUE

6. WDR R

7. WDR G

8. WDR B

5. VSM PRESET

VSM PRESET NORMA L

1.CONT

: STORE i : EXIT

- / +

***

- / +

Fig.3 SUB MENU SCREEN

No. 51944

3. AUDIO

AUDIO

1. ERR LIMIT 10H

C_AD_BIT S =

: STORE i : EXIT

* ** *** **

Do no t adjust

1. ERR L IMIT

2. A2 ID T HR

Page 16

V28CH1EUS

V28CH1EUB

(3) Meth od of Set ti ng

1) Meth od of Setti ng 1. IF [VCO] ････････････････････････････ It mus t not adjust wit hout si g nal.

① 1 K ey･････････････････････････ Se lect 1.IF. ② 1 K ey･････････････････････････ Se le ct 1 .VCO(CW )

Make sure that the arrow position between the ABOVE REF and BELOW REF.

③ INFORMATION K ey ････････････ Return t o th e SERVICE ME NU scr e en.

2) Meth od of s ett in g 2.V/C, 3.AUDIO, 4.DEF and 5.VSM PRESET.

① 2～5 K ey･･････････････････････ Select one from 2.V/C, 3.AUDI O, 4.DEF and 5 .VSM PRESET. ②

FUNCTION U P / DOWN Key

③

FUNCTION - /+

④

ME NU Key

⑤

INFOMATION K ey

･････････････････

････････････････････

･････････････

････

Select s etting items.

Set ( adjust) th e setting valu es o f th e setting it ems.

Memorize the setting value.

(Bef or e st or ing t he s ett in g valu es in memory, do not pres s t he CH, TV , POW ER ON / OF F key if you d o, the valu es will not be stored in memory.)

Retu rn t o th e SE RVICE M E NU s cr een.

3) Can not setting 6.S TATUS, 7. PIP, 8. --- , 9 .SH IP PING(OFF ) & 0.B US FR EE .

(4) R ele ase of SERV IC E M E NU

1) Af ter c o mp l eti ng th e se tti ng , ret urn t o the SER VIC E ME NU , then ag ai n p r ess th e INFOR MATIO N ke y.

No. 51944

Page 17

ADJUSTMENTS

CHECK ITEM

Item

Check of B1 Power Supply

Measuring

instrume nt

Signal generator

DC v o l tm et er

Remote control unit

Test point Ad justment part Description

TP-91(B1) TP-E(####)

[X connector on POWER

DE F PW B ]

1.R G B BL K 1. Recei ve a an y broa dca s t.

2. Pu sh t he “ZOOM ” ke y an d s elect the FULL mode .

3. Select 2 . V/ C from the SER VICE MENU.

4. Select 1 . RGB BLK w ith f un ction UP / DOW N key.

5. Press the functi on +( ) key to fin d th e cut off screen (Black screen).

6. Con nect a D C voltmet er t o T P- 9 1(B 1) a nd TP-E(#).

7. Make sure t hat th e volt age is DC139.9 ±2.0V.

8. Press the functi on – ( ) key t o return t o s ervice m enu..

V28CH1EUS V28CH1EUB

Check of High Volt age

Check of VCO

Signal generator

DC volunteer

Remote control unit

IF S ERVIC E MENU

1. VCO

2. ATT ON/OFF

1-2 : SELECT

TO O HI GH ABOVE REF JUST REF BELOW REF TO O LO W

VCO(CW)

MAI N

CRT anode

Chass is GND

i : EXIT

****

MHz

i : EXIT

1.R G B BL K 1. Recei ve a an y broa dca s t.

2. Pu sh t he “ZOOM ” ke y an d s elect the FULL mode .

3. Select 2 . V/ C from the SER VICE MENU.

4. Select 1 . RGB BLK w ith f un ction UP / DOW N key.

5. Press the functi on +( ) key to fin d th e cut off screen (Black screen).

6. Connect a DC voltmeter t o CRT ANODE and chassis GND.

7. Make sure t hat th e volt age is DC 31.0 kV .

+1kV

-1.5kV

8. Press the functi on – ( ) key t o return t o s ervice m enu.

1. VC O " U nd er n orm a l c ondi ti ons, no ad just ment is r e quired .

" Conf irmat ion adjus t me nt.

1. Select 1 .IF from the SERVICE MENU.

2. The n se lect 1 .VCO from th e IF S ERVICE MEN U.

3. Rec eive any bro adc ast.

4. C heck t he ar r ow () posi ti on be tween th e A BOVE REF. and

(Do not move)

BE LOW REF .

No. 51944

Page 18

V28CH1EUS

V28CH1EUB

ADJUS TMENT OF FOCUS & SCREEN

Item

DAd j ust men t of

FOCUS

Measuring

instrume nt

Signal generator

HVT

Test point Ad justment part Description

FOCUS VR

SCREEN VR

FOCUS VR [In HVT]

1. Rec eive a cross -hatc h sign al. S elect FULL mode .

2. Whi l e w atc hing th e scr een , a djust th e F OC US VR to m ake th e

ver ti cal and ho rizo ntal l ines as f in e a nd sha rp as possi b l e.

3. Make sur e that when the sc re en i s d ar ke ned , the lines re ma in

in good focus.

Ad justment of SCREEN

Signal

generator

SCREEN VR [In HVT]

1 Press a w h ole b lack si gn al 2 Press the ZOOM key and select the FULL mode.

3 Se lect 2. V/ C from the SERVICE MENU. 4 T ur n t he SCR EEN V R c lockwis e f r om th e f ul l co unt er

V/C

PAL

cl ockw is e p osition and s t op it a t th e po i nt w h er e “ CLOW ” stat us (mark e d in Fi g.) c h ang es f ro m 1 t o 0 to 1 ( wh ich i s

1. RGB BLK

ind icated at th e 3rd colu mn from the right.)

5 The n tur n th e SCREEN V R cou nt ercl o ckw is e, and st op wh ere

- / +

: STORE i : EXIT

0 0 0 0 0 1 0 0

CLOW

status

th e “ C LOW ” stat us ch an ges 1 t o 0

＊ “C LOW ” : c ontr o l loopou t of win do w.

ERVICE MODE SCREEN

VSM PR ES ET AD JUS T SET TIN G

Item

Setting of VS M PRESET

Setting item

VSM preset mod e

COOL +130 -11+1 0-17-9 0

Measuring

instrume nt

Remote control unit

Test point Ad justment part Description

1. C ONT .

2. BR IG HT

3. SHARP

4. COLOUR

5. HUE

6. W DR R

7. W DR G

8. W DR B

1. Select 5.VS M P RESET fr om th e S ERVICE ME NU.

2. Select CO OL with the MENU key of t he remote con trol unit.

3. Adjust the FUNCTION UP/DOWN and -/+ key to bring the set

val u es of 1.C ON T ～ 8. WDR B to the values shown in the

tabl e.

4. Pr ess the MENU key a nd memoriz e th e s et value.

5. Respectively s elect the VSM PRESET mode for NORMAL and

WARM, an d m ake si milar a djust ment as i n 3 abo ve.

6. Pr ess the MENU key a nd memoriz e th e s et value.

∗ Refer to OPERATING INSTRUCTIONS for the PICTURE

MO DE.

1.CONT. 2.BRIGHT 3.SHARP 4.COLOUR 5.HUE 6.WDR R 7.WDR G 8.WDR B

NORMAL 00-1100000

WARM -13 0 -11 -1 0 +4 0 0

SE TT ING VAL UES OF VSM PRESET

No. 51944

Page 19

VIDEO / CHR OMA CIRCUIT ADJUSTMENT

The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.

V28CH1EUS V28CH1EUB

Setting item

(Adjustment item)

2. V/C PAL SE CAM NT SC

1.R G B BL K

2.WDR R 0

3.WDR G 0

4.WDR B (Do not adjust) -12

5. BR IG HT 0

6.CONTRAST 0

7.COLO UR 000

8. HUE +20

9.SHARP (Do not adjust) +7

Initial set ting v al ue

11.VID AG C (Do not adjust) 0

12.SY C SLI +7

13.A MOVIE +1

No. 51944

Page 20

V28CH1EUS

V28CH1EUB

Item

Ad j ust men t

of WHITE

BALANCE

(High Light)

Measuring

instrume nt

Signal

generator

Remote control unit

Test point Ad justment part Description

2. W DR R

3. W DR G

4. W DR B (Do not adjust)

" Se t th e P ICT URE MODE to NORMAL.

1. Recei ve a bl ack a nd white sign al (col o ur of f).

2. Select 2 .V/C f r om the SERVICE M ENU.

3. Modif y 2. W DR R and 3.W DR G da ta t o ad just t he w hite balance ( high light ).

4. Pr ess the MENU key a nd mem oriz e th e s et va lue.

5. Cha nge th e c ontrast an d brig htn ess with the remot e c ontr o l

up & dow n from lo w– light t o h igh–light a nd c heck t hat the tr ack ing of the w h it e bal an ce is g oo d.

Ad j ust men t of

SUB BRIGHT

Ad j ust men t

of SUB CONT.

Remote control unit

Remote

control unit

5. BR I G HT 1. Rec eive any broadc ast.

2. Se lect 2 .V/C f r om the SE RVICE M ENU.

3. Select 5 .BRIGHT with th e FU NCTI ON UP /DOWN key.

4. Set the initial setting value with the FUNCTION -/+ key.

5. If the brigh tn ess is n ot th e b est wi th the i n itia l se tting value ,

make fine adjustment until you get the best brightness.

6. Press the ME NU key a nd mem oriz e th e s et va lue.

6.CO NT. 1. Rec eive any bro adc ast.

2. Se lect 2 .V/C f r om the SE RVICE M ENU.

3. Select 6.CONT with t he FUNCTION UP/DOWN key.

4. Set the initial setting value with the FUNCTION - / + key.

5. If the con tr ast is n ot the be st with t he initial s e tting va lue, ma ke

fine adjustment until you get the best contrast.

6. Press the ME NU key a nd mem oriz e th e s et va lue.

No. 51944

Page 21

V28CH1EUS

V28CH1EUB

Item

Ad j ust men t

of SUB CO LOUR

Measuring

instrume nt

Remote

control unit

ⅠⅠⅠⅠ

Test point Ad justment part Description

7.COLO UR (PAL～～～～NT S C)

PAL COLOUR (PAL COLOUR)

CH. key

SECAM COLOUR

( OK ) k ey

NTSC COLO UR

[Method of adjustm ent without measuring instrument]

1. Rec eive PAL broad cas t.

2. Se lect 2 .V/C f r om the SE RVICE M ENU.

3. Select 7 .COLOUR with th e FU NCTIO N UP/DOWN key.

4. Set the initial setting value for PAL COLOUR with the

FUNCTION - or + k ey.

5. If t he co lour is no t the bes t with th e in iti al set va lue, ma ke

fine adjustment until you get the best colour.

6. Press the ME NU key a nd mem oriz e th e s et va lue.

(SECAM COLO UR)

1. Rec eive a SECAM b roadc ast.

2. M ake fi n e a dj ustm e nt of SE CA M COLOUR in the s am e

manner as for abo ve.

(NTSC 3.58 COLOUR)

1. Input a NTSC 3.58MHz C OMPOSITE VIDEO si g nal f r om th e EXT t erminal.

2. Make s imil ar f ine ad jus tm en t of NT SC 3.58 COLO UR in th e sam e mann er as f or a bo ve.

FUNCTION k

　　( INFORM ATI ON ) keyi

REMOTE CONTROL KEY

(NTSC 4.43COLOUR)

1. When NTSC 3.58 COLOUR set, NTSC 4.43 COLOUR will automatically set.

No. 51944

Page 22

V28CH1EUS

(+)

(-)

(A)

V28CH1EUB

Item

Ad j ust men t

of SUB CO LOUR

Measuring

instrume nt

Signal

generator

Ⅱ

ⅡⅡ

Oscilloscope

Remote control unit

Test point Ad justment part Description

TP-47B

####

TP-E( [CRT

SOCKET PWB ]

7.COLO UR (PAL～～～～NT S C)

)

PAL COLOUR (PAL COLOUR)

SECAM COLOUR

[Method of adjustm ent using measur ing instrument]

1. Rec eive a PAL fu ll f i eld co lour b ar si gn al (75% w hite ).

2. Se lect 2 .V/C f r om the SE RVICE M ENU.

3. Select 7 .COLOUR with th e FU NCTI ON UP/DOW N key.

4. Set the initial setting value of PAL COLOUR with the

FUNCTION - or + k ey.

5. Con nect the osc illosc ope be tw ee n T P -4 7B and T P- E( #).

6. Ad just PAL COLO UR an d b r ing th e valu e of (A) in the illustration to the values as shown given billow (Voltage

diff er enc e betwee n wh ite ( W ) and b lu e ( B) ) .

7. Press the ME NU key a nd mem oriz e th e s etti n g value.

VOLTAGE (W-B) +8V

(SECAM COLO UR)

1. Rec eive a SECAM fu ll field co lour bar si gn al ( 75% white) .

2. Set the initial setting value of SECAM COLOUR with the

FUNCTION - /+ ke y.

3. Adju st SE C AM CO LOU R an d b ri n g t he va lu e of (A) in the

illu strati on t o th e values as s hown g iven b ill ow (Volt ag e diff er enc e betwee n wh ite ( W ) and b lu e ( B) ) .

4. Press the ME NU key a nd mem oriz e th e s etti n g value.

WCyMgB

NTSC COLO UR

VOLTAGE (W-B) +7V

(NTSC 3.58 COLOUR)

1. Input a NTSC 3.58 MHz C OMPOSITE VIDEO si gnal (full fi eld

colo ur bar with 75% w hit e) from the EXT t ermina l.

2. Set th e i nitial s etting val ue of N T SC 3 .58 COLO UR wit h th e

FUNCTION - /+ ke y.

3. Adjus t NTS C 3 .5 8 C OLO UR a nd bring th e val u e of ( A) in the

illustration to the values as shown given billow (Voltage diff er enc e betwee n wh ite ( W ) and b lu e ( B) ) ..

4. Press the ME NU key a nd mem oriz e th e s etti n g value.

VOLTAGE (W-B) 0V

(NTSC 4.43COLOUR)

1. When NTSC 3.58 COLOUR set, NTSC 4.43 COLOUR will

automatically set.

No. 51944

Page 23

V28CH1EUS

(B)

(-)

(+)

V28CH1EUB

Item

Ad j ust men t of

SUB HUE ⅠⅠⅠⅠ

Measuring

instrume nt

Remote control unit

Test point Ad justment part Description

8.HUE [Method of adjustment without measuring instrument]

NTSC 3.58 HUE [NTSC 3. 58 HUE]

1. Input a N TSC 3.5 8 MHz C OM POSI T E V IDEO si gn al (f ul l fi e ld colo ur bar with 75% w hit e) from the EXT t ermina l.

2. Se lect 2 .V/C f r om the SE RVICE M ENU.

3. Select 8. HUE with t he FUNCTION UP/DOW N key.

4. Se t the initia l sett ing va lue of N TSC 3. 58 HUE wi th th e FUNCTION - /+ ke y.

5. If you cannot get the best hue with the initial setting value, make fine adjustment until you get the best hue.

6. Press the ME NU key a nd mem oriz e th e s et va lue.

NTSC 4.43 HUE (NTSC 4.43 HUE)

1. W hen NTS C 3.58 i s s et , NTSC 4.4 3 will be automat ic ally s et at

the respective values

Ad j ust men t

SUB HUE

ⅡⅡⅡⅡ

Signal

generator

Oscilloscope

Remote control unit

CyMgB

TP-47B

####

TP-E( [CRT

SOCKET PWB]

8. HUE [Method of adjustment using measuring instrument]

)

NTSC 3.58 HUE [NTSC 3.58 HUE]

1. Input a N TSC 3.5 8 MHz C OM POSI T E V IDEO si gn al (f ul l fi e ld

colo ur bar with 75% w hit e) from the EXT t ermina l.

2. Se lect 2 .V/C f r om the SE RVICE M ENU.

3. Select 8. HUE with t he FUNCTION UP/DOW N key.

4. Se t the initia l sett ing va lue of N TSC 3. 58 HUE wi th th e FUNCTION - or + k ey.

5. Con nect the osc illosc ope be tw ee n T P -4 7B and T P- E( #)

6. Adjus t N TSC 3. 58 H UE t o br i ng the val u e of (B) in the

illustration t o -1V (voltage difference between white (W) and magenta (Mg)).

7. Press the MENU key and memorize the s ettin g value

NTSC 4.43 HUE (NTSC 4.43 HUE)

1. When NTSC 3.58 COLOUR s et, NTSC 4.43 COLOUR will automatically set.

No. 51944

Page 24

V28CH1EUS

(Do not adjust)

V28CH1EUB

DEFLECTION CIRCUIT ADJUSTMENT

There are 4 aspect modes ( ①①①①FULL, ②②②②PANORAMIC, ③③③③ SUBTIT LE , ④④④④COMPRES) of the a djustme nt ( 1 ) 100 H z i mod e, ( 2 ) 1 20 Hz i mode ･･････

･･････ depending upon the kind of signals ( vertical frequency 100Hzi / 120Hzi ).

････････････

When the 100 Hz FULL mode has be en establ ished, the se ttin g of other mode s will be done automatically.

Ho wever, if the picture quality has not been optimized, adjust each mod e again, respectively.

" The adjustment usi ng the remote control unit is made on the basis of the initial setting values. "

The setting values which adj ust the screen to the optimum condition can be different from the initial setti ng values.

Ini tial setti ng v alue ( 1/2) 　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊

Setting item Ad justment name

1. V- SH IF T Ve rt ic al cent er -006 -006 00 00 0000

2. V- SIZ E Ve rt ic al he ight -006 -001 + 003 00 00

3. H-CEN T H or izont al ce nte r -014 + 002

4. H-S IZE Hor i zont al width +007 - 003

5. TRAPEZ Trap ezoi da l disto rt ion c orr ec ti on -016 - 010 00 00 0000

6. EW -PIN Si de pin cor rection -045 00 00 0000 00 00

7. CO R-P IN Cor ne r Pi n -005 00 00 +002 00 00

8. CO R-UP Corne r P in c orr ect i on Up si de - 003 - 004 + 005 0000

9. CO R-L O Cor ne r P in c orrect ion Low s id e -007 - 003 - 002 00 00

10 .AN GL E An gl e c orre ction 00 00 0000 0000 0000

11 .BOW Bo w-sh ape d dis tortio n corr ec t io n 0000 00 00 0000 0000

12.V- S.CR

13 .V- LIN

(Do not a dju st)

Ve rt ic al heig ht c or r ection -007 00 00 +013 00 00

Ve rt ic al Lin ear i ty -003 -002 00 00 0000

Ini tial setti ng v alue ( 2/2)

Setting item Ad justment name

1. V- SH IF T Ve rt ic al cent er +012 - 002 00 00 00 00

2. V- SIZ E Ve rt ic al height +009 0000 - 011 0000

3. H-CEN T Horiz ont al cente r 0000 00 00 00 00 00 00

4. H-S IZE Hor i zont al width 00 00 0000 00 00 00 00

5. TRAPEZ Tr ap ez oida l disto rt i on correc ti on -001 00 00 0000 00 00

6. EW -PIN Side pin correc ti o n -001 00 00 0000 00 00

7. CO R-P IN Cor ne r P i n -005 00 00 00 00 00 00

8. CO R-UP C or ne r P i n c orrect ion U p side + 009 0000 0000 00 00

9. CO R-L O Cor ne r P i n c orrect i on Lo w s id e +005 00 00 00 00 00 00

10 . AN GL E An gl e c orre ction 0000 00 00 00 00 0000

11 . BOW Bo w- sh ape d dis tortio n correct io n 00 00 0000 0000 00 00

12. V-S. CR

(Do not a dju st)

13 . V- L IN

(Do not a dju st)

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊

Initial set ting v al ue

FULL PANORAMIC

10 0Hzi 12 0Hzi 100Hzi 12 0Hzi

-003 00 00

-004 00 00

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　＊

Initial set ting v al ue

SUBTITLE COMPRESS

10 0Hzi 12 0Hzi 100Hzi 60 P

Ve rt ic al heig ht c or r ection +003 0000 0000 00 00

Ve rt ic al Lin ear i ty -027 00 00 00 00 0000

: Fixed value

No. 51944

Page 25

Item

Ad j ust men t of V-SHIFT

Measuring

instrume nt

Signal generator

Remote

control unit

Test point Ad justment part Description

1. V- S HI FT [FULL mode]

1. Receiv e a cir cle p att ern si g nal of ve rt ic al fr eq ue ncy 5 0H z.

2. Selec t 4 .DEF f rom t he SERVI CE M ENU.

3. Select 1 .V-SHIFT wi th t he FUNCTION UP/DOW N key.

4. Ad just V-S HIFT to make A = B .

5. Check the ad justmen t value ab o ve in o ther zo om mo de . If it is a

wrong adjustment, re-adjust in PANORAMIC mode and adjust

by 1.V-SHIFT.

6. Pres s the MENU key a nd mem or iz e th e s et va lue.

V28CH1EUS V28CH1EUB

Ad j ust men t of V-SIZE

Screen size

Scr e en

size

Picture size 100%

ASPECT MODE FULL PANORAMIC SUBTITLE

SCREEN SCREEN

TOP

SCREEN SCREEN

BOTTOM

　　　　　　　　　　　　　　　　　 [ SCREEN SIZE ]

92 % 87 % 70 % 92 % 87 % 70%

92 % 87 % 83 % 92 % 87 % 83%

[ SCREEN SIZE ]

2.V-SI ZE 7. R eceiv e a cross -hatc h sign al.

8. Select 2.V-SIZE and set the initial setting value.

9. Ad just V-S IZ E a nd make s ure t hat the ve rt ic al scr een siz e of

10 . Pr ess the MENU key a nd m em or iz e the s et value.

12. Press the MENU key and memorize the s et value

Picture

size

10 0%

th e p ict ure s ize is i n t he bel l ow t abl e.

11 . Input a NT SC V IDEO si gn al (6 0H z) fr om the E XT ter m i nal,

an d make s u r e t hat the v er ti cal s cr een s iz e is i n t he t ab le

below.

No. 51944

Page 26

V28CH1EUS

V28CH1EUB

Item

Ad justment of

H.CENTER

Ad j ust men t

of H.S IZ E

Measuring

instrume nt

90 %

Test point Ad justment part Description

3. H-CENT. 13 . Recei ve a c ir cle p atter n s ig nal.

14. Select 3.H-CENT and set the initial setting value. 15 . Ad ju s t H- CE NT to ma ke C=D.

16 . Pr ess the MENU key a nd m em or iz e the s et value.

90 %

4. H- SIZ E 17. Receive a circle pattern signal.

18. Select 4.H-SIZE and set the initial setting value. 19 . Ad ju st H-S IZE an d m ake sur e th at t he horiz on tal scr ee n size

20 . Press the MENU key a nd mem oriz e th e s et va lue. 21 . Inp ut a NTSC VIDEO signal ( 60 Hz) fr om t he E XT ter m inal,

22 . Press the MENU key a nd mem oriz e th e s et va lue.

of th e pict ur e si ze is i n th e bel l ow t abl e .

an d make sur e th at t he h ori zo nt al sc r een siz e of the eac h ASPECT mode is in the below table.

AS PE CT

MODE

H SI Z E

Ad justment of EW-PIN

FULL PANORAMIC SUBTITLE

92 % 95 %

[ SCREEN S IZE ]

6.E W-PI N 23 . Selec t 6 .EW-PIN an d s et t he i nitial s etti ng valu e

Straight

92 %

24 . Adju st E W - PIN and m ak e th e 2 nd.vert ic al lines at the left a nd

right ed ges of the sc r ee n st ra i ght . Als o m ake s ur e th at the 3r d vertical lines are straight.

25 . Pr ess the MENU key a nd m em or iz e the s et value.

No. 51944

Page 27

V28CH1EUS

V28CH1EUB

Item

Ad j ust men t

of TRAPEZ

Ad justment of COR. UP/LO

Straight Straight

Measuring

instrume nt

Signal generator

Remote control unit

Signal generator

Remote control unit

Test point Ad justment part Description

5. TR APEZ 26 . Recei ve a cr oss -h atc h signal.

27. Select 5.TRAPEZ with the FUNCTION UP/DOWN key.

28. Set the initial sett ing value of T RAPEZ with th e FUNCT ION

- or + key.

Parallel

7.COR-PIN

8.COR-UP

9.COR-LO

29 . Adju st TRAP EZ an d bring th e VER TICAL l in es at the righ t

an d lef t edges o f the sc re en pa ra llel .

30 . Press the ME NU key a nd mem oriz e th e s et va lue.

31. Select 8.COR-UP with the FUNCTION UP / DOW N k ey.

32. Set the init ial setting value of COR.-UP with the FUNCTION

- or + key.

33 . Adjus t CO R- UP, a nd b ri n g th e str ai gh t lin e at th e up per

corner.

34. Select 9.COR-LO with the FUNCTION UP / DOWN key.

35. Set the initial setting value of COR-LO with the FUNCTION

- or + key.

36 . Ad just COR- LO, an d b ring t he straight line at the low co rner . 37 . Press the ME NU key a nd mem oriz e th e s et va lue.

38 . If th e e xtream upper & lower corners ar e a l ittl e p in or barrel

ch ose 7.C OR -P IN an d adju st.

39. Press the MENU key and memorize the s et value

Ad j ust men t

of ANGLE

Fig. A

10. ANGLE •

No. 51944

In case where th ere is a para l lelogrammi cal d ist or ti on of

images on th e scr e en.( FigA )

40. Select 10.ANGLE with the FUNCTION UP / DOWN key.

41 . Ad just ANGE L, and b ri n g t he VERTIC AL lines str aight..

42 . Press the ME NU key a nd mem oriz e th e s et va lue.

Page 28

V28CH1EUS

V28CH1EUB

Item

Ad justment of BOW

Ad justment of V-S.CR &

V. LI NE AR IT Y

Measuring

instrume nt

Test point Ad justment part Description

11.B OW

Fig. B

12.V- S.CR

13.V- LIN

TOP

In case w here there is a b ow- shaped distortion of images on the

•

screen. (Fig.B)

43. Select 1 1.B OWwith th e FU NCTIO N UP/DOWN key.

44 . Ad just BO W , an d bri n g t he VERTIC AL lines str aight. 45 . Press the ME NU key a nd mem oriz e th e s et va lue.

Wh en the vertical linearity has been deteriorated rem arkably,

•

perform the following steps.

46 . Receiv e a cross -hatc h sign al.

47. Se lect 13.V-LIN with t he FUNCTION UP/ DOW N k ey.

48. Set the initial setting value of 13.V-LIN with t he FUNCTION

- / + key.

49. Select 12.V-S.COR with t he FUNCT ION U P / DOW N key.

50. Set the initial setting value of 12.V-S.COR with the FUNCTION

- / + key.

51 . Adju st 13 .V- LI N and 12 .V- S.COR so that th e s pac es of ea ch

line on TO P, CENTE R and BO TT OM bec ome u ni fo rm .

NO T E :D o not ad just PA NO RAM IC & SUBTITLE mode.

CENTER

BOT TOM

At first the adjustment in 100Hz FULL mode should be done, th en th e d at a for th e ot he r asp ect mo de is corr ec t ed in the

resp ec ti ve val ue a t t he s am e ti m e. A nd co nfirm th e d eflec ti o n ad justm en t i n itia l se tting va lue i n 12 0H z (NT SC EXT mod e)

FU LL m od e. If the adju stmen t in 10 0Hz eac h aspect mode h as b een don e and sto red, th e data f or th e s ame as pect m od es in

12 0Hz i s cor re cte d i n th e res pect ive v a lue. Only t he da ta fo r th e oth er as pect mod e i n 12 0Hz i s co rr ect ed f or its elf.

No. 51944

Page 29

AUDIO CIRCU IT ADJUSTMENT

Do not tou ch 3. AUDIO a dj ust me nt of the SER V ICE M ENU as it re quire s no adj ustm en t.

If values ha d ch an ge d for the s o me r eas on, set th e i nitial val ues in th e f ollowi ng table.

3. AUDIO(D o not adjust)

Setting item Variable range fixed value

1. ER R LI M IT 00 H～FFH 0AH

2. A2 ID THR 00 H～FFH 19H

V28CH1EUS V28CH1EUB

No. 51944

Page 30

V28CH1EUS

V28CH1EUB

No. 51944

JVC AV28CH1EUB, AV28CH1EUS Service Manual

AV28CH1EUS AV28CH1EUB

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

MAIN DIFFERENCE LIST

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS