JVC AV-27D503/R, AV-27D503/S Service Manual

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Page 1

SERVICE MANUAL

COLOR TELEVISION

AV-27D503

BASIC CHASSIS

AV-27D503

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

SAFETY PRECAUT IONS

! FEATU RES ････････････････････････････････ ! HOW TO IDENTIFY MODELS ････････････････････････････････ !

FUN CTIONS ････････････････････････････････

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

SERVICE ADJUSTMENTS

PARTS LIST ････････････････････････････････

★ STAND ARD CIRCUIT DIAGRAM ････････････････････････････････

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

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

････････････････････････････････

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

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

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

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

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

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

････････････････････････････････

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

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

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

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

･･････････････････････････････ 2

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

････････････････････････

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

･･･････････････････････････････････

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

････････････････････ 4

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

･･････････････････････････････････

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

･･････････････････････

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

････････････････････････････････････ 31

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

･････････････････ 2- 1

･･････････････････････････････････

･･･ 4

･･････

･･ 4

････

･･････････････ 6

････････････････････････････

No.519 46

May 2002

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V-27D503

SPECIFICATIONS

Items Contents

Dimensions (W××××H××××D) 29-5/8 ”×23-1/4”×19- 1/2”

(752 mm×591mm×49 4mm)

Mass 71 .3Ibs (32 .4kg)

TV System and Color system

TV RF Sy stem

Color Sy st em

Sound System

TV Receiving Channels and Frequency

VL B and

VH Ba nd

UH F Ba nd

CATV Receiving Channels and Frequency

Low Band

Hi gh B and

Mid Band

Super Band

Hyper Band

Ul tra Ba n d

Sub Mid Band

TV/CATV Total Channel

Intermediate Frequency

Video IF Carrier

Sound IF Carrier

Color Sub Carrier 3.5 8 M Hz

Power Input 12 0V A C, 60Hz

Power Consumption 12 3W

Picture Tube 27” (68cm ) m easured di agonal l y, Full S quare Hi gh V ol ta ge 29 kV±1.3 kV (at zero beam cur r ent)

Speaker 2”×4-3/4 ” ( 5×12 c m) Oval type ×2

Audio Power Output 5W+5W

Input termi nals

INPUT1 Video

S-Video

Audio (L,R)

INPUT2 Video

Component (Y,Pb,Pr)

Audio (L,R)

INPUT3 Video

(Front) Audio (L,R)

Audio Output 50 0mV rm s(-4dBs)

AV Compu link EX Input 3.5 mm mini jac k Antenna terminal 75Ω (VHF/U H F ) Terminal, F-T ype Con nector

Remote Control Uni t RM-C251 (A A/R6/UM-3 batter y×2)

CCIR(M)

NTSC-M BTS C (Multi Channel S ound )

(02～06) 5 4M Hz～88 MHz (07～13) 1 74M Hz～216MH z

(14～69 ) 4 70M H z～80 6MHz

(02～06, A-8) by (02～06 &01 ) (07～13) b y (07 ～13) (A～1) by (14 ～22 ) (J～W) by (23～36) (W+1～W+ 28) by (37 ～64 ) (W+29～W +84) by (65 ～12 5) (A8, A4～A1) by (01, 96～99)

18 0 Chan nel s

45 .75 MH z

41 .25 MH z (4.5M Hz)

1V p- p 75Ω (RCA pin jack) Y :1 Vp-p p os itive ( neg ative sync pro vided , when terminated with 7 5Ω) C: 0. 286Vp- p ( bur st s ig nal , when t ermin ated wi th 7 5Ω)

50 0mV rm s (-4dBs) , Hi gh I mpe dance (RC A pi n jack) 1V p- p 75Ω (RCA pin jack) Y: 1 Vp-p p os itive ( negat ive sync p rovided, whe n ter mi nat ed wit h 75Ω)

PB/PR: 0.7Vp-p 75Ω

50 0mV rm s (-4dBs) , Hi gh I mpe dance (RC A pi n jack)

1V p- p 75Ω (RCA pin jack)

50 0mV rm s (-4dBs) , Hi gh I mpe dance (RC A pi n jack)

Low Im pedan ce (40 0Hz wh en m odul ated 100 %) (R CA pin jack)

(54MHz～80 4MHz)

De sign & speci f icatio ns ar e su bje ct t o cha n ge w itho ut notice .

No.51946

Page 3

SAFETY PRECAUTIONS

V-27D50

1. The desi gn of t his p ro du ct c ont ai ns spec i al h ar dw ar e, man y ci rcu its and c o mp on ent s s peci al l y for saf ety pur p oses. F or continued protection, no changes should be made to the origina l des ign u nless a uth or i zed in wri ting by t he man ufactu re r.

Replacem en t par ts m ust be id ent ic al t o t hos e used in th e origina l circui t s. S er vic e s ho ul d be perf or me d b y qu ali fied p ers onnel o nly.

2. Al te rati on s of th e des i g n o r circu itr y of the p rodu cts s hou ld n ot b e m ad e. A ny de sign alte ra tions or ad di ti o ns will vo id th e

manufacturer's warranty and will further relieve the manu fac t urer of resp ons ibi lit y f or pe rs ona l i n ju r y or p r ope rt y d am age r esult ing t heref rom .

3. M an y e lectrical an d mec h an ic al pa rt s in th e produ cts h ave sp ecial s af ety-r elat ed charact eris tic s. Th ese charac teri sti cs ar e

oft en not e vid en t fr om visu al in spe ction no r can t he prote cti on aff orde d by th em n ecess ar ily be o bta ined b y usi ng replac ement compon ent s rated for h ig her vo l tag e, wa ttage, etc. Replacem en t pa rt s wh ic h h ave t hes e sp ec ial s afet y ch aracter istics a re i d entifi e d in th e par ts l ist of S ervic e man ua l.

Electrical components having such features are identified by shading on the schematics and by (!!!!) on the parts list

in S erv ice manual. Th e us e of a su bst itu te re plac emen t whic h

does not have the same saf ety characteristics as the reco mmen ded replac emen t pa rt sho wn i n the pa rts lis t of Se rvi c e ma nu al m ay c ause sh ock, f ire, or o th er haz ards.

4. U se isola tio n tr an sf orme r when hot c hass is . The chassis and any sub-chassis con tained in s ome products are c onnect ed to on e side of th e AC p ow er l i ne . An i sola ti on tr ansf or m er of ad equ ate cap acity sh ould be inser t ed bet ween th e p rodu ct and t he AC p ow er s u pp ly p oi nt while p er for m i ng

an y ser vice on so me pr oducts when th e H OT ch assis is exp ose d.

5. Don't shor t between the LIVE side ground and ISOLATED

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

So m e mod el 's p ow er c irc ui t is par t ly dif feren t in the GND. Th e diff er enc e of t he GN D is s h ow n by th e LI VE : (") side GND, th e ISO LAT ED(NEU TRAL) : (#) side GND an d EAR T H : ( $) si de GND. Don 't sho rt be tw ee n t he LIVE s id e GN D a nd ISO LATE D(N EU TR AL) si de GN D or EART H si de GN D and never measure with a measuring apparatus (oscilloscope etc.)

th e LI VE s ide GND a nd ISO LATED( N EUTRA L) si d e G ND or EARTH sid e GND at the s ame time. If above note will not be kept, a fuse or any parts will be broken.

6. If any re pa ir h as b ee n mad e to th e c h assi s , i t i s re c om m end ed th at t he B1 se tti n g s h ou ld b e chec ked or ad jus te d (S ee

ADJUSTM ENT OF B 1 POW E R SUPPLY).

7. The hi g h v olt age a pplied t o the pictu re tu be mu st co nform wi th that specified in Service manual. Excessive high voltage can cau se an incr ease i n X- R ay e mi ssi on , arc in g an d possib l e com po nent d am ag e, th eref or e op er atio n un der ex cess ive hi gh

vol ta ge c ond it i ons sh ou ld be ke pt to a min i mu m, or sh ou ld be preve nt ed. I f seve re arc ing occu rs, r em ove th e AC p ower immediately and determine the cause by visual inspection (incor r ec t i nsta lla ti on , crac ked o r m el te d high vol tag e har ness, p oor s olde rin g, etc. ). T o ma in ta in the pr op er mi ni m um l e v el of

sof t X- R ay e miss ion , c om p one nts in th e hi g h vol tag e ci r cuitr y incl ud i ng the pi ctu r e tu be mu s t be the ex a c t r ep lac em en ts or alte rn at ives a ppr o ved b y th e ma nuf actu r er of th e c o mp l ete prod uct.

8. Do n ot c hec k high vol ta ge by d r awing a n ar c. U s e a hi gh vol ta ge m ete r or a hi gh volt age p ro be wi th a VT VM . Disch arge

th e p ictu r e tu be bef ore a tte mp ti ng meter co nne cti on , b y con nec ting a cl i p lead to th e gr ou nd frame a nd con n ec ti ng t he oth er e nd of t he lead th roug h a 10 kΩ 2W resist or to t he ano de

bu tto n.

9. W hen s e rvice is r equ i r ed, ob s er ve th e orig inal l ea d dress . Extra p r ecau ti on s h ou ld be giv en to assu r e cor re ct lea d dr es s in the hi gh volta ge c ir cu it ar ea . W her e a sh ort ci r cuit ha s occu rr e d, th ose c ompon en ts th at i nd ic ate ev i den c e of overheating should be replaced. Always use the

manu fac t urer 's r epl ace m ent com p onents.

10 . Isolation Check

(Safety for Electrical Shock Hazard)

Af ter r e- a s sembling th e pr od uct , always pe rf or m an is o l ation ch eck on th e expo sed m eta l p ar ts of th e c abi n et ( ant en na

ter m i na ls, vide o/a udio input and out put t er mi n al s, C on trol knobs, metal cabinet, screwheads, earphone jack, control sh afts, etc.) to be s ur e th e pr o duc t is saf e t o op er at e wi th out d ang er of elect ri ca l shoc k.

(1) Di electric Strength Test

The is olat ion b etwe en the AC primary c ircu it and al l m eta l parts exp osed t o the us er, par t icu l ar l y an y ex po sed metal p ar t h aving a re tur n pat h to the ch as sis sh ou ld w i ths t and a volta ge of 11 00V AC ( r .m .s.) f or a p eri od of on e sec ond.

(. . . . Withstand a volta ge of 1100 V A C (r.m.s.) to an applian ce

rate d up to 1 20V , and 3 000V AC ( r .m. s.) t o an appl i anc e ra ted 200V or more, for a period of one second.) Thi s m eth od of test r e qu ires a t es t eq uip ment n ot g en er ally fou nd in t he servi c e t ra de.

(2) Leakage Current Check

Plug t he A C line cord direct ly i nt o th e AC ou tlet ( do not u s e a line is olation transf ormer during t his che ck.) . Using a " L eakage

Current Test er", m ea s ur e t he leakag e cur r en t fr om each exp ose d m eta l par t of th e c a bi ne t, p ar tic ul ar l y an y expo sed metal part having a retu rn path to t he ch assis, to a kn own good ea rt h gr o und ( water p ipe, etc.) . A ny l ea k ag e c ur r en t must not

exce ed 0.5m A AC ( r .m. s.) . Howev e r, in t ro pical a rea, this m ust no t e xc eed 0 .2m A AC (r.m.s.).

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

Plug t he A C line cord direct ly i nt o th e AC ou tlet ( do not u s e a line isolation transformer during this check.). Use an AC

vol tm et er h av i ng 100 0 ohm s per vol t or m ore s en s iti vity in the follo win g ma nne r. Connec t a 1 50 0Ω 1 0W resi s tor pa ralle l ed by a 0.15μ F AC-typ e cap acitor b etwe en an exp ose d m eta l p art and a k no wn go od earth gr ou nd (wate r pi p e, et c .).

Measu re th e A C vo ltag e acr os s th e r esist or wit h t he AC voltmeter. Move the res istor connection to each exposed metal part, particularly any exposed metal part having a return path to

th e ch assis , an d m ea sur e t he A C volta ge acr oss th e r esisto r. Now, reve rs e the plu g i n t he A C out let a nd r ep e at e ach measu rem ent. An y volta ge measu red m us t not exce ed 0.7 5V AC (r.m. s.) . This corresponds t o 0 .5 mA AC ( r.m.s.). Howev e r, in tr op ic al ar ea, this m ust n ot excee d 0.3V AC (r.m.s.). This corr esp on ds t o 0 .2mA A C (r.m.s.).

AC VOLT METER (HAVING 1000 Ω/V,

GOOD EARTH

GR OUND

11 . High voltage hold down circuit check.

Af ter rep ai r of th e high vol t age h ol d d own c i r cuit, th is ci rcu it sh all be c hec ked to op er ate cor rectly. See item "Ho w to check the high voltage hold down cir cuit".

This mark shows a fast operating fuse, the

letters indicated below show the r ati ng.

0.15μF AC-T YPE

1500Ω 10W

OR MOR E SENSIT IVITY)

PLACE THIS PROBE ON E A C H EX PO SE D

ME T AL PA RT

A V

No. 51946

Page 4

V-27D503

FEATURES

New ch assi s d esign ena bles use o f a m ai n b oard w it h simplifi e d

circuit ry.

3 LIN E Di g it al Comb f ilt er Im pr oved p ic ture qual it y .

Full-square CRT (cathode ray tube) reproduces fine textured

pictu re i n ev er y d et ail.

With AV COMPU LINK EX te rminal.

" Closed -c aptio n b r oad casts can be viewed . "

With AUD IO / VI DEO INP UT t erminal.

" S-VIDEO input terminal for taking best advantage of Super VHS. "

Au di o out put ter m i na l.

I2C bus control ut ilizes single chip ICs.

" Be caus e built-in the BBE ci rc uit impr oved th e sou nd of

conversation.

DVD dec k outp ut ca n i npu ts to c ompon en t v ideo sign al inpu t

terminal.

The hyper-su rround system marks a reproduction of the acoustic

eff ects in a the ate r with str o ng ap peal.

Bec aus e of bu ilt- i n 2 tu ner & P IP ci r cuit, displ ays p lur al pr og r am s

on th e scr e en at t he sam e ti me .

Built-in V-CHIP,V-CHIP CAN system

HOW TO IDENTIFY MODELS

How to recognize from the appearance of the model concerned is written below. Please distinguish from several con tents c u rr e ntly p rint ed on th e r at in g l a bel

Parts nam e

RATING L ABE L GQ3 0032 -0 01A-A

MODEL

AV-27D503/S AV-27D503/R

←←←←

INDICATED AV-27D503 INDICATED AV-27D503

INDICATED““““S””””

Ⅰ

FUNCTIONS (

■

FRONT PANEL

1 2

INPUT3 VIDEO terminal MENU button POWER button

INPUT3 AUD IO L terminal

INPUT3 AUD IO R termina l VOLU ME -/+ butto ns REMOTE CON TROL sens or

ⅠⅠ

4 5

)

6 7

CHANNE L - /+ bu tt ons

MENU O PER A T E / buttons

8 9

INDICATED

ON TIMER lamp

““““R””””

No. 51946

Page 5

Ⅱ

FUNCTIONS(

■■■■

REMOTE CONTROL UNIT (RM-C251)

ⅡⅡ

)

V-27D50

POWER key MENU key

EZ SURF key PI P keys

INPUT key CHANNEL keys

DISPLAY key LIGHT key

SLEEP TIMER key

HYPER SUR. key CH－/＋( /

VIDEO STATUS key EXIT/PIP OFF key

THEATER PRO key V C R CO N TRO L key

V-CH IP key

)keys

■■■■

REAR PANEL

BBE key VCR / DVD

MUTING key TV / CATV

VOL－/＋(

The CH-/+ and VOL-/+ keys operate CHANNEL and

NOTE

VOLUME normally.

Thes e keys are also used to navigate MENU system.

▼/▲)

keys

sw it ch

switch

8 9

INPUT 1 A UDIO R t erm inal INPUT 2 AUDIO L/MONO terminal COMPONENT Y terminal

INPUT 1 AUDIO L/MONO terminal INPUT 2 VIDEO terminal COMPONENT PB terminal

INPUT 1 VIDEO terminal AUDIO OUT R terminal COMPONENT PR terminal

INPUT 1 S-VIDEO

INPUT 2 AUDIO R terminal AV COMPULINK EX terminal

11 12

AUDIO OUT L terminal VHF / UHF terminal

No. 51946

Page 6

V-27D503

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVE THE REAR COVER

U np lug the po we r plu g.

!!!! "

1. Rem ove th e 12 screws marked

2. Remove the rear c over t oward you.

* When r ei nst al l in g th e re ar c o v er , c ar efu lly pu s h it i nw ar d af ter

inserting the chassis into the rear c over groove.

as sh ow n i n F ig .2.

REMOVING THE CHASSIS

" After removing the rear cover.

1. Slight l y r aise th e bo th si des o f th e c hassi s by ha nd a nd remov e

the 2 claws marked #

th e ch assi s fr o m t he front cabinet .

2. Dr aw th e chas sis b ackwar d alo ng th e r ai l m ar ked

the arrow direction marked (If nec ess ar y , take off the w ire cl am p, c onn ec t or’s e tc .)

* When con ducti n g a chec k with p ower s u ppl i ed , b e sure t o

con firm th at the CRT earth wire is c onn ec te d t o t he CRT

SOCKET PW B and th e M AIN P W B.

# ( Fig. 1 and Fig .2) un der th e bo th sid es of

$$$$

(Fig.1) in

%%%%

(Fig.2.).

REMOVING THE TE RMINAL BOARD

After removing the rear cover.

1. Rem ove th e 4 screws ma rked

2. W hen you pu l l ou t th e T E RMIN AL BOARD, i t ca n b e re mo ved .

"&"&

(Fig.2)

"'"'

REMOVING THE SPEAKER

" After removing the re ar cover and chassis.

1. R em ove t he 4 screws ma rked *"

2. Follow th e s ame s t eps when r em ovin g t he oth er h and spe ake r.

*"(Fig.2.)

*"*"

CHECKIN G THE MAIN PW BOARD

1. To ch eck the ba cks ide of t he MA IN PW Boar d.

(1) Pull out the ch assis. ( Refer to REMOVIN G TH E CHAS SIS ). (2) Erect the chassis vertically so that you can easily check the

backside of the MAIN PW Board.

[CAUTION]

• When erect ing th e ch assi s, be caref ul so th at the r e will be n o

con tact in g with ot her P WB.

• Before turning on power, make sure t hat the CRT earth wire and

oth er c o nn ecto rs are p ro perly c o nn ecte d.

WIRE CLAMPIN G AND CABLE T Y ING

1. Be sure t o clamp th e wir e.

2. Never rem o ve th e cable ti e used f or tyi ng the w i re s to gethe r.

Sh oul d it be i n adv e rt ent l y rem ove d, be su r e to tie the wires with a n ew c able tie.

FRONT CABINET

CHASSIS

MAIN PWB

REMOVING THE FRONT CONTROL PW BOARD

After removing the re ar cover and ch assis.

1. Rem ove t he 2 screws marked

2. Then r emo ve the FRONT CONTROL PWB.

((((

(Fig.2).

REMOVING THE FRONT AV IN PW BOARD

After removing the re ar cover and ch assis.

1. Rem ove t he 2 screws marked

2. Then r emo ve the FRONT AV IN PW B.

))))

(Fig.2 .).

Fig. 1

No. 51946

Page 7

FRONT CABINET

V-27D50

PICTURE TUBE

SP EAKER

REAR COVER

AV SELECTOR PWB

CLAW

CRT SOCKET PWB

FRONT CONTROL PWB

FRONT AV IN PWB

FRONT AV IN P WB

CHASSIS

PIP PW B

TUNER

POWER CORD

CLAW

MAIN PWB

FBT

AV JAC K

TERMINAL BOARD

Fig.2

No. 51946

Page 8

V-27D503

C BUS

)

SYS0

MEMORY IC REPLACEMENT

1. Memory IC

This TV uses me mor y IC . Thi s m em or y IC st ores d ata f or pr oper o pera tion of the vide o and deflec ti o n cir cuits.

When r ep la c ing t he mem or y IC , be s ur e to us e an IC co nta ini ng th is ( i ni ti a l value ) d at a.

2. Memory IC replacement procedure

(1) Power off

Switch off th e pow er an d di s con nec t th e p ow er c o rd fro m t he out let.

(2) Replace the memory IC

Be sure t o use a memory I C written with the initial settin g data.

(3) Power on

Con nect th e power cord to th e o utlet and switch on the power.

(4) Con fir m th e sy st em const an t value

12 .S YSTEM ( SYS ) do not a djust nor m al l y.

The adjustment should not be done without signal.

! Ho w t o ent er t he SY ST EM (SYS ).

1) Press the SL EEP TIMER ke y and se t SL EEP TIMER f or 「0 min」.

2) Be fore di sap pe ar th e displ a y of S LEE P TIM ER set tings , si mu l tan eous ly

press th e DISP LAY key an d VIDEO STA TUS ke y of th e rem ot e c ont rol un it.

3) The SER V ICE M ENU s cree n of Fig.1 i s d isp layed .

4) While the SERVICE MENU is displayed, select t he SYSTEM(SYS) item

wi t h ME NU ▼/▲ (CH-/+) keys, and the MENU / (VOL-/+) keys is

pressed, the screen will be displayed as shown in Fig.2.

5) Refe r to the SY ST EM (SY STEM CONST A NT) TAB LE 1 a nd ch eck t he

setting items. If the value is different, select the setting item with the ME NU ▼ / ▲ (C H -/ +) keys and adj u s t the sett in g with th e

MENU / (VOL-/+) keys. (The letters of the selected item are

displayed in yellow. )

6) W hen adjustment has co mp le te d, t he v al ues sto re in to m emor y IC

automatically

7) Press the EX IT key t wice to r eturn th e n orm al scr een.

SETTING N o

SE RVICE MENU

SERVICE MENU

1.V/C(S) 2.DEF(D)

3. SOUND(A) 4 .OTHERS( F)

5.PIP(PIP) 6.3L Y/C(LYC)

7.LOW LIGHT 8.HIGH LIGHT

9.RF AFC 10.VCO

12.SYSTEM(SY

11.I2

SELECT BY OPERATE BY EXIT BY

Fig.1

12 .SY STEM(SY S

SETTING ITEM

1 VIDE

Fig.2

EXIT

***

SETTING VAL UE

Verifi ed

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

(5) Rec eiv e channel setting

Refe r to the OPERA TING IN S TRUCTIONS ( USER'S GUID E) and set th e r ec e i ve ch annel s ( Cha nn els Pres et) as des crib ed.

DISPLAY

(6) User settin gs

Check th e us er s ett ing it ems ac c ordi ng to TABL E 2 .

SLEEP

TIMER

Wher e thes e d o not agree, r ef er to th e OP ERATIN G I NSTRUC TION S

(USER'S GU IDE) an d s et t he it ems as des crib ed.

VIDEO

STA TUS

MENU ▼/▲

EXI T

(7) SERVICE MENU setting

Ve rif y what to s et i n th e SER VI CE M EN U , and s et what ever is

MENU /

necessary. (Fig. 1) Ref er to the SERV ICE ADJUSTMENT f or setting.

No. 51946

Page 9

TABLE 1 (System Constant setting)

No Setting item Variable range

SY S01 VIDEO 0～4 3 SY S02 PIP 0～1 1

SY S03 3D Y/ C 0～1 0 SY S04 Y CV 0 ～1 1 SY S16 EZ SURF 0～1 1

SY S05 CCD P CHK 0～1 1 SY S17 ID D ISP 0～1 1 SY S06 PUR ITY 0 ～1 0 SY S18 COMP U LINK 0～1 1 SY S07 VM 0 ～1 0 SY S19 CCD 0～1 1 SY S08 NOISE CR 0～1 0 SYS20 VCHIP 0～1 1 SY S09 CLR TEM P 0～1 1 SY S10 THEATE R 0 ～1 1

SY S11 THEATE R PRO 0～1 1

SY S12 BBE 0～1 1

Initial setting

value

No Settin g ite m Variabl e ra nge

SYS 13 HYP S URR

SY S14 16:9 MD

SY S15 HYP S CA N

SY S21 VCH IP CA

SY S22 JVC LOGO

SY S23 CMP IN

SY S24 CXA1 87 5

0～1 0～1

0～1

0～1 0～1

0～1

TABLE 2 (User setting)

Setting item Setting value Setting item Setting value

Use remo t e co ntrol ler ke ys

POWE R OFF DISPLA Y OF F

CHANNEL Cable-02 VIDEO STATUS DYNAMIC

VOL UME 10 SLEEP TIMER 0

TV/VIDEO TV PIP SOURCE Cable-04

HYPE R SURROUND OF F PIP POS ITION Left lo wer side

BB E ON

V-27D50

Initial setting

value

Settings of MENU

PICTURE MODE INITIAL SETUP MODE

STANDARD

TINT CENTER FRONT PANELLOCK OFF

COLOR CEN TER V2 COMPONENT -I N NO

PICTURE CENTER AUTO SHUT O FF OFF

BRIGHT CEN TER

DETAIL CENTER

COLOR TEMPERATURE LOW

DY N AMI C

TINT CENTER

COLOR CENTER +8

PICTURE

BRIGHT CENTER

DETAIL CENTER +10

COLOR TEMPERATURE HIGH XDS ID ON

NOISE MUTING ON

SOUND MODE CLOCK / TIMERS MODE

BASS CEN TER SE T CLOC K TIME ZON E : PACI FIC

TR EBL E CENTER

BALANCE CENTER

MTS ST ERE O

CENTER

LA NG U AGE

CLOS ED CAPTIO N

AUTO TUNER SET UP TUNER MODE : CABLE

CHANNE L SU MM AR Y Unn ecess ary to set

V-CHI P

SET LOCK CODE

ON/OFF TIMER

ENG

OFF CAPTION : CC1 TEXT : T1

OF F

SET TV RATING S : ALL CLEAR

SET MOVIE RATINGS : ALL CLEAR

UNRATED : VIEW

(000 0) U nn ec es sary to set

D.S.T : ON NO

No. 51946

Page 10

V-27D503

SERVICE ADJUSTMENTS

ADJUSTMENT PREPARATION:

1. Yo u c an ma ke the nec es sary adjust me nts f or t his u nit wi th

eit her the R emot e Co ntrol Unit or W ith the adjust m e n t

tool s and parts as given below.

2. Adjustment with the Re mote Control Unit is ma de on t he

bas is of t h e initial sett in g v al ues, howev er, t he ne w s etti ng

values which set the screen to its optimum condition may

differ f rom the init ia l s ettings.

3. M ake sure t hat AC p ower i s tu r ned on c orrec tly.

4. T ur n on t he powe r for set and test equ ipm ent bef ore us e, an d

start th e adjus tme nt p r oced ur es aft er waitin g at l east 30

min ute s.

5. U nl ess other wis e spec if ied, prep ar e th e m ost s uitab le rece ptio n

or inp ut sign al for adjust ment.

6. N ever t ouc h an y ad ju stmen t p arts w hi ch ar e n ot sp ecified in th e

list for t hi s adjus tm ent - va r i abl e r es istors, tr a ns fo rmer s ,

condensers, etc.

7. Pr es etti ng b efore adj us tm en t.

Unl es s oth er w is e spec if i ed in th e ad justm en t instruct ions,

pres et t he f ollowing function s wi th the rem ote co ntr ol u nit:

User mode position

MENU ITEM PRES ET

VIDEO STATUS DYNAMIC

H YPE R S U RRO U ND OF F

TINT, COLOUR , BRIGHT

CENTER

PICTURE,DETAI L

BA SS, TREBLE, BA LA NCE CEN TER

ADJUSTMENT EQUIPMENT

1. DC voltmeter (or digital voltmeter)

2. Oscilloscope

3. Si gn al g en er ator (P attern g en erat or) ［NTSC］

4. Remote control unit

5. TV a ud io m ulti pl e x sign al ge ne rator .

6. Frequ enc y cou nte r

ADJUSTMENT ITEMS

Adjustment item Adjustment item

B1 POW E R SUPPL Y

VCO SUB C O LOR

MAIN VCO

SUB V CO " PIP CIRCUIT

RF AGC WHITE BALANCE

" FOC U S DISPLA Y POS ITION

" DEFLECTION " MTS CIRCUIT

V.HEIGHT, V.CENTER INPUT CIRCUIT

H.POS ITION SEP AR ATIO N

WHITE BA LAN CE

Low Light PURITY

High Ligh t STAT IC

SUB CONTRAST

SUB T I NT

PU R I T Y / CO NV ER GE NCE

MTS ST E RO

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

DISPLAY

SLEEP

TIMER

VIDEO

TAT

▲

▼/

EXI T

SUB B RIGHT D YN AM IC

No. 51946

Page 11

ADJUSTMENT LOCATIONS

(

)

V-27D50

FRONT CONTROL PWB

I C7701

CN 700 7

POWER MENUVOL CH

PIP PWB

I C4101

CN 007

T 4111

FRONT

FRONT AV IN PWB

CRT SOCKET PWB

TP-R

CN 300 4

TP-G

TP-E( )

SOLDER S IDE

TP-B

CN 300 5

CN 30E2

CR T EART H

(BRAIDED ASS'Y)

MAIN PWB

FRONT

TOP

FRONT

AV SEL E CTOR PW B

CN 001

CN 002

CN 003

PIP PWB

T 111

IC10 1

IC70 2

IC20 1

TUNER

CN 004

S421

F 901

V CENTER SW

DEG .

CR T EART H

(BRAIDED ASS'Y)

HV T

HV THV T

UPPE R : F OC US LOWER : SC REEN

TP-E ( )

B1 (TP-9 1)

No. 51946

Page 12

V-27D503

BASIC OPERATION OF SERVICE MENU

1. Operate the SERVICE MENU with the REMOTE CONTROL UNIT.

2. In general , basic setting (adjustments) items or verifications are perfor med in the SERV ICE MENU.

(1) V/C (S) ･････････････････････ This se t the s etting valu es (adjustment values) of th e VIDEO/ CHROMA circuits .

(2) DEF (D) (3) SOUND (A) ･････････････････ This set the s ettin g values (a djustme nt va lues) of th e AUDIO circuit.

(4) OTHERS (F) (5) PIP (PIP) ･･･････････････････ This set the s ettin g values(ad justment values) of the PICTURE-IN-PIC TU RE circ uit.

(6) 3L Y/C (LYC) ････････････････ T hi s is us ed when th e 3L Y/C MOD E is verified . [Do not adjust]

(7) LOW LIGHT (8) HIGH LI GHT ････････････････ T hi s se ts th e s etti ng values ( a djust ment values ) of the W HITE BALANCE ci r c uit

(9) RF AFC (10) VCO ･･･････････････････････ Thi s is us ed when th e IF VCO is a djust ed .

(11) I2C BU S (12) SY ST EM (SYS) ･･････････････ This i s us ed w hen the S YSTE M is ve r if i ed. [Do not adjust]

3. Basi c Op era tions of th e SERVI CE M EN U (1) Ho w to enter the SERVICE MENU.

(2) SERVICE MENU screen selection

････････････････････

････････････････

･･･････････････････････････

･････････････････

････････････････････

Press the SLE EP TIMER ke y and set the SLE EP TIM ER for ｢0 MIN ｣ .

Then press the DI SPLAY key and VI DE O STATU S key of

the remote contr ol u nit at the same time to ent er the SE RV ICE MENU sc r een s h ow n i n figu r e.

Press th e MENU ▼ / ▲ ( CH-/+) key to select any of the

following items. (The l e tte rs of the s elect ed it ems are di sp layed in ye llo w. )

This se t th e s etting valu es (adjustme nt values) of th e DEFLECTIO N circuit.

This is us ed when the OT HERS MODE i s ver ified. [Do not adjust]

(PIP i s me ans as P icture I n P ictur e)

Thi s se ts th e s etting va lu es (a dj ust me nt val ues ) of t he W HIT E BALANC E ci r cuit.

This is us ed when the RF AFC MODE is verified. [Do not adjust]

Thi s is us ed w hen ON/O FF of t he I2C BUS CTRL is set. [Fixed ON]

SERVIC E MENU

1.V/C(S) 2.DEF(D)

3.SOUND(A) 4.OTHERS(F)

5.PIP(PIP) 6.3L Y/C(LYC)

7.LOW LIGHT 8.HIGH LIGHT

9.RF AFC 10.VCO

11.I2C B US 12 .SYSTEM(SYS)

SELECT BY OPERATE BY EXIT BY

EXIT

(3) Enter the any setting ( adjustment ) mode

" 1.V/C (S), 2.DEF (D), 3.SOUND (A), 4.OTHERS (F),

5. PIP ( P) , 6 .3L Y/C ( LYC) , 7.LOW LIG HT, 8. HI GH LIGHT, and I2C BUS an d 12.SYSTEM (SYS) mode

1) If select an y of 1.V/C (S) / 2.DEF (D) / 3.SOUND (A)

/ 4.OT HERS (F) / 5.PIP ( PIP ) / 6.3L Y/C ( LYC) /

7.LOW LIGHT / 8. HIGH LIG HT / 1 1.I2C BUS /12.SY ST E M ( SY S) items, and the

MENU / (CH-/+) key is pressed from SERVICE MENU ( MAIN MENU ), the each screens will be displayed as shown in figure page later.

2) The n the sett in gs or v er i fi cati on s can b e p erfor m ed

" 9. RF AF C , 10.V CO mode

1) If select th e 9.RF AFC / 10.VCO items, and the

ME NU▼/▲( CH-/+ ) key i s press ed fr om SE RV IC E

MENU(MAIN MENU), the screen will be displayed

as shown in figure page later.

2) The n MENU / (VOL- /+ ) key is pr ess ed, t he RF

AFC SU B mo de , VCO S UB mod e scr ee n is displayed.

3) The n t he VCO setting c an be performed and

RF AFC verifications can be perf ormed

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

DISPLAY

SLEEP TIMER

VIDEO

TAT

▲

▼/

EXI T

No. 51946

Page 13

SERVICE MENU FLOW CHAR T

SERVICE MENU (M AIN MENU)

1.V/C(S ) 2.DEF(D)

3.SOUN D(A) 4.OTHERS(F )

5.PIP (PIP) 6 .3 L Y/C(L YC)

7.LOW LIGHT 8.HIGH LIGHT

9.RF AFC 10.VCO

11.12C BUS 12.SYSTEM(SYS)

SE L E CT BY OPERATE BY EXIT BY EX I T

V-27D50

SE RV IC E M EN U

1.V/C ( S)

R F 4 : 3 S T D L O W

S0 1 BR IG H T

2.DEF(D)

R F 4 : 3 S T D L O W

D 01 V FR EQ

3.SOUND(A)

A 01 IN L EVE L

***

7.LOW LIGH T

BRIGHT

***

*** ***

8.HIGH LIG HT

***

9.RF AFC MAIN

TOO HIGH GOOD T OO LOW T U NE R M AI N

AF G O N FIN E

DO not ad ju st

9.RF AFC SUB

TOO HIGH GOOD T OO LOW T U NE R SU B

AF G O N

FIN E

4.OTHERS( F)

F0 1 OS D POSI

5.PIP(PIP)

PI P01 BRI G HT

6.3L Y/C(LYC)

LYC01 MODE

***

T U NE R MA IN HI G H L EV EL REFERENCE LEVEL

LOW LEVEL SY N C NO

11.I2C BUS

I2 C BU S ON

12.SY ST EM ( SY S)

SY S01 VIDE O IN

***

10.VCO SUB 10.VCO M A IN

T U NE R S UB HI G H L EV EL

REFERENCE LEVEL LOW LEVEL SY N C N O

DO not ad ju st

No. 51946

Page 14

V-27D503

(4) Setting method

1) ME NU▼/▲(CH-/+) key

Select t he SETTIN G IT EM .

2) MENU / (VOL-/+)key Setti ng (adjust) the SET TIN G VA LUE of t he SETTING ITEM.

When the key is r el ea sed th e SET T I NG VAL UE w ill b e st or ed (memorized).

3) EX IT key

Retu rn s to the p revious scr een .

(5) Releasing SERVICE MENU

1) Af ter r etu rni ng to t he SE RV ICE MENU up on c o mp l etion of th e s etti n g (adjus tment) wo rk, pr ess t he EXI T key ag ain.

★ The s etti ng s f or L OW LIGHT and H I GH L IGHT ar e des c ribe d in th e

WHITE BA LAN CE pag e of ADJU STMENT .

★ The sett ing f or VC O are d escr i bed i n th e IF VC O pa ge o f

ADJUSTM ENT.

SETTING N o

RF 4 : 3 STD LOW

SETTING ITEM

1.V/C (S)

RF 4 : 3 STD LOW

D01 V F REQ

2.DEF (D)

***S01 BRIG HT

SETTING VAL UE

***

A01 IN LEVEL ***

3.SOUND (A)

No. 51946

Page 15

V-27D50

INITIAL SETTING VALUE OF SERVICE MENU

1. Adjustment of the SERVICE MENU is made on the basis of the ini tial setting va lu es ; ho wev er, the new setting values whic h set the screen in its optim um condition may differ from the initial setting.

2. Do no t c hange the initial Setting Values of the Setting (Adjustment) items not listed In “ADJUSTMENT”.

" V / C M O DE

Initial setting value

RF EXTERNAL (S,CV) COMPONENTNo Setting item Variable range

STANDARD THEATER STANDARD THEATER STANDARD THEATER

S01 BRIGH T

S02 PICTURE

S03 COLO R

S04 TIN T

S05 DETAIL

S06 BRIGH T + -

S07 PICT +-

S08 COLOR +-

S09 TIN T+ -

S10 D ETAIL + -

No Setting item Variable range

S11 R CUT OFF 0～255 30 - -- - -- - -- - -- - -- - -- - -S12 G CUT OFF 0～2 55 30 --- - -- - -- - -- - -- - -- - --

S13 B CU T OF F 0～2 55 30 - -- - -- - -- - -- - -- - -- - -S14 R D RIVE 0～1 27 64 - -- - -- - -- - -- - -- - -- - --

S15 B D R IVE

S16 R C UT+- - 128～+127---0000--------S17 G CUT+- -128～+127---0000---------

S18 B CUT+-

S19 R D RV +- - 128～+127 --- +5 +12 +7 0 - -- --- - -S20 B DRV+- -128～+127 --- +6 -25 -9 0 --- --- ---

S21 NTSC MA T 0～3 33112211 S22 BLACK S T 0 ～3 1 --- 1 --- --- --- --- ---

S23 DCRE ST 0～1 1 --- 1 --- --- --- --- ---

S24 DCRSW 0～1 1 --- 1 --- --- --- --- ---

0～127 64 - -- - -- - -- --- - --

0～1 27 55 - -- - -- - -- --- - -0～127 55 - -- - -- - -- 60 - --

0～1 27 64 - -- - -- - -- 67 - --

0～63 37 - -- 35 - -- 40 ---

-128 ～+127 --- +1 0 --- -1 ---

-128 ～+1 27 --- - 10 0 --- 0 - --

-128～+127 --- -3 -2 --- --- ---

-128 ～+127 --- -3 -2 --- --- ---

-128 ～+127 --- 0 --- --- --- ---

Initial setting value

RF /EXT (S, C V)

STANDARD THEATER STANDARD

LOW HIGH LOW HIGH LOW HIGH LOW HIGH

0～127 64 - -- - -- - -- - -- - -- - -- - --

-128 ～+127---0000---------

--- c a n n ot be ad ju s tm ent

COMPONENT

THEATER

No Setting item Variable range

S25 ASY SHR P 0 ～7544 S26 BPF FO 0～10 0 ---

S27 KILR OFF 0～10 0 --S28 KILR SEN 0 ～11 1 ---

RF EXTERNAL (S,CV) COMPONENT

No.51946

Initial setting value

Page 16

V-27D503

No Setting item Variabl e ra nge Initial se tting v al ue

S29 RGB MUTE 0～1 0 S30 BLUE B 0 ～1 0

S31 VIDEO SW 0 ～3 3

S32

RGB ABCL

S33

OSD A BL

S34 OSD C ON T 0～63 10 S35 SUB CONT 0～15 8

S36 AB L GAIN 0～3 0 S37 ABL PNT 0～3 3 S38 Y G AMMA 0～3 1

S39 Y MU TE 0～1 0 S40 SV M GAIN 0 ～3 0

S41 SVM PH 0～3 0

S42 WPL 0～1 0 S43 COL GMM 0 ～1 0 S44 V1 GAI N 0～7 4

S45 AGC A DJ 0～127 63

S46 VMOFF DE -128～+127 0 S47 APC CL K 0～1 1

DE F MO D E

No Setting item Variable range

D01 V FREQ 0～30 3 D02 AFC GAI N 0～30 2 D03 H POSI 0～31 16 ---

D04

H POSI+-

D05

V PHASE 0～70 ---

D06

V P H+- - 128 ～+127 --- 0

D07

V S IZE

D08

V S IZE+ - - 128 ～+127 --- 0

D09

V CENTER 0～63 32 ---

D10 V CENT+-

D11

V S CORR

D12

V S CO+-

D13

V LIN

D14

V L IN +- -128～+127 --- 0

D15

H SIZE 0～63 32 ---

D16

H SIZE +- - 128～+127 --- 0

D17

WVMT TOP 0～30 0

D18

WVMT BTM 0～3

D19

EWCR TOP

D20

EWCR T+-

D21

EWCR BTM 0～31

D22

EWCR B+ -

D23

EW P ARA

D24

EW PRA+-

D25

V E HT 0～70 ---

D26

V E HT+-

D27

H EHT

D28

H EHT+ - -128～+127 --- 0

D29 TRAPEZ 0～63 32 --D30

TR APE Z+-

D31

V A GC 0～10 0

D32

BLANK SW

D33

VRMP BI

0～1 0～1

-128 ～+127 --- 0

0～+127 60 ---

-128 ～+127 --- 0 0～15

-128 ～+127 0～15

0～31

-128 ～+127

-128 ～+127 0～63

-128 ～+127

0～7

-128 ～+127

0～1 0～1

0 0

--- c a n n ot be ad ju s tm ent

Initial setting value

RF EXTERNAL (S,CV)

8---

--- 0 12 ---

16 ---

--- 0

16 ---

--- 0 32 ---

--- 0

--- 0 0---

--- 0

00 00

No.51946

Page 17

SOUND MODE

No Setting item Variabl e ra nge Initial se tting v al ue

A01 IN LE VEL 0 ～15 10

A02 LOW SEP 0～63 32

A03 HI SE P 0～63 32 A04 SAPC 0 ～1 0

A05 BBE BA SS - 128 ～+127 0 A0 6 BB E TRE -128 ～+127 -3

V-27D50

OTHERS MODE (Do not adjust)

No Setting item Variabl e ra nge Initial se tting v al ue

F01 OSD P OSI 0～15 50

F02

OSD PREQ

F03

CCD POSI

F04

CCD FREQ

F05

OSD CONT

F06 PUR WBCK 0～1 0

F07

PUR CONT

F08

SN T YP E

F09 YCSN TM 0～255 5 F10 YCSN E 0～255 5

F11 YCSN F 0～255 16

F12

YCSN G

F13

VNR CHK

F14 VCSN TM 0～255 5

F15 VCSN 1 0～63 0

F16 VCSN 2 0～63 7

F17

VCSN 3

F18

VCSN ST P

F19 VN DAT A -128～+127 +8 F20 VM D AT B -128～+127 -4

F21 VM D AT C -128～+127 -10

F22 VM D AT D -128～+127 -16 F23 VM D AT E 0～1 1 F24 VMOFF TY 0～2 0

F25 YC V MOFF 0～255 25 5 F26 EZSF T M 0～255 40 F27 XDSID TM 0～255 15

F28 FM TRAP 0～1 1

0～15 0～15

0～15 0～63

0～63

0～2

0～63

0～255

0～63

0～255

Setti ng item ca n not di spla

90 40

8 0

21 10

" 3L Y / C MODE (Do not adjust)

No Setting item Variabl e ra ng e Init ial setting v al ue

LYC01 MO DE 0～7 4

LYC02

LYC03

LYC04 LYC05CBVNLR

LYC06 GSEL0 0～1 0

LYC07 LYC08

LYC09 TRAP 0～1 0 LYC10 CHTRAP 0～1 0

LYC11 CBPF 0～1 0 LYC12 ENHOFF 0～1 0

VE NH

PDSO FF

GSEL1 COR

0～7 0～1

0～1

0～15

0～1 0～3

Se tting i tem ca n n ot di spla y

0 2

0 0

No.51946

Page 18

V-27D503

PIP MODE

No Setting ite m Variabl e range Initial setting value

PIP01 BRIGHT 0～15 0

PIP 02 PIP 03

PIP 04 PIP 05

PIP06 G CUTOFF 0～15 0

PIP 07 PIP 08

PIP 09 G DR IVE 0～255 65

PIP 10 B DR IVE 0～255 65 PIP11 L POSI 0～255 22

PIP 12 PIP 13

PIP 14 LWR PO SI 0～127 11 PIP 15 PICT L CK 0～1 1

PIP16 SELDEL 0～15 0

PIP 17 PIP 18

PIP 19 AGC 0～15 7

PIP 20 BLKINVB 0～1 0

PIP 21 BLKINVR 0～1 0 PIP22 VSPDEL 0～31 0

PIP23 VSPISQ 0～1 1 PIP24 RGBIN 0～1 0 PIP 25 FR SEL 0～1 1

PIP26 OUTFOR 0～1 0 PIP 27 UVPO LAR 0～1 0

PIP28 MAT 0～1 1 PIP 29 YCOR 0 ～1 1

PIP 30 XFR EQF 0～1 1

PIP31 WTCHDG 0～1 1 PIP 32 COLO N 0 ～1 0 PIP33 ACQNEW 0～1 0

PIP 34 DST DET 0～1 1 PIP 35 CRL BEO K 0～1 0

PIP 36 FC BEOK 0～1 0 PIP 37 NOC RI D 0 ～1 0

PIP 38 NON SED 0 ～1 0 PIP 39 PIP ADJ 0～15 4 PIP40 BRI EXT -128～+127 0

PIP 41 PCT EX T -128 ～+127 0 PIP 42 TN T EXT -128～+127 0

PIP 43 COR EXT - 128～+127 0

PIP44 R-D EXT -128～+127 0 PIP 45 G-D EXT - 128 ～+127 0

PIP 46 B-D EXT -128～+127 0 PIP47 BRT COMP -128 ～+127 0

PIP48 PCT COMP -128～+127 0 PIP49 TNT COMP 0～63 40 PIP50 COR C OMP 0～15 5

PIP51 R-D COMP -128～+127 0

PIP52 G-D COMP -128～+127 0 PIP53 B-D COMP -128～+127 0

PICTURE TINTI

COKOR R CUTOFF

B CUTOFF R DRIVE

R POSI UPR POSI

AGCFIX AGCADST

0～75 0～63

0～15

0～255

0～127

0～1 0～1

30 42

6 0

15 12

1 0

No.51946

Page 19

■

)

ADJUSTMENTS

B1 POWER SUPPLY

Item

Check of B1 POWER

SUPP LY

Measuring

instrume nt

DC Volt met er 【【【【B1 】】】】

ADJUS TMENT OF VCO

Test point Adjustment part Description

1. Recei v e th e blac k- a nd -w hi t e sign al. ( c olo r off )

Connector

TP-91 TP-E(#)

2. Con nect the D C voltm et er to 【B1 】co nne ctor 【1】pin (TP-91) an d TP -E (#) ( B1 connect or【3】pin ).

3. Confirm that the voltage is DC134V±2V.

V-27D50

Item

MAIN VCO adjus tme nt

TUNER MAIN HIGH LEVEL

REF ERE NCE L EVEL LOW LEVEL

SYNC NO

Measuring

instrume nt

Signal

generator

Test point Adjustment part Description

10.VCO MAIN

CW TRANSF.(T111 [MAIN PWB]

GREE N

" It must not adjust witho ut signal.

1. Se le ct a r eceiva bl e broa dcast .

2. Push the MENU▼/▲(CH- /+ ) key, an d selec t th e 10 .VCO

mod e from th e S ERVICE MENU.

3. Push t he MENU / (CH-/+) key, and select MAIN

4. Conf ir m t hat the co lo r ch an ge from ｢HIGH LEVEL｣ to ｢LOW LEVEL ｣ b y CW TR AN SF T11 1 at M AIN PW B, and ch eck th e

｢

SYNC : YES｣.

5. Adjust until ｢REFFERENCE LEVEL｣ mark tu rn s gre en.

And th en con firm t hat th e ｢SY NC : YES｣ ag ain.

SUB VCO adjus tme nt

TUNER SUB HIGH LEVEL REF ERE NCE L EVEL

LOW LEVEL SYNC NO

10.VCO S UB SUB

CW TRANSF.(T4111) [PIP PWB]

GREE N

No. 51946

1. Recei v e a black a nd white sign al ( color off).

2. Push the MENU ▼ /▲ ( CH-/+ ) key, an d s el ec t th e 10 .VC O

mod e from th e S ERVICE MENU.

3. Push t he MENU / (CH-/+) key, and select SUB

4. Conf ir m t hat the co lo r ch an ge from ｢HIGH LEV EL ｣ to ｢LOW LEVEL ｣ b y SUB CW TRANSF T41 11at PIP P W B, and c he ck the ｢SYNC : YE S｣.

5. Adjust until ｢REFFERENCE LEVEL｣ mar k tu rn s gr e en. And th en con firm t hat th e ｢SY NC : YES｣ ag ain.

Page 20

V-27D503

ADJUS TMENT OF RF AGC

Item

RF. AGC adjus tme nt

S45 AGC ADJ 0～127 63

Measuring

instrume nt

Settin g ite m Va riabl e

Test point Adjustment part Description

range

ADJUS TMENT OF FOCUS

Item

FOCUS adjus tme nt

Measuring

instrume nt

Signal generator

Test point Adjustment part Description

S45 AGC ADJ 1. R eceiv e th e b r oadcast.

2. Select S45 AGC ADJ of th e V /C MODE.

3. Pr ess the MUT IN G ke y an d t urn of f c ol or .

4. Wi th the MENU k ey to get the nois e in th e scre en pi c tu re

Initial setting

value

FOCUS VR [In HVT]

(zer o s id e of set ting v alu e) .

5. Press the MENU key several times and step wh en noise

disa ppe ars from th e s creen ( a t th at time, no t to i nc rease th e value too much)

6. Cha nge to oth er c h an ne ls a nd make sur e t hat th ere I s n o irregularity.

7. Press the MUTING key and get color out.

1. Recei v e th e cross -hatch sign al.

2. Whi l e loo king at t he scr ee n, adj u s t th e F OC U S VR to the

vertical and horizontal lines will be clear and in fine detail.

3. Make sur e t hat th e p ict ur e is in f oc us even whe n t he scr ee n

g ets d ar k en ed.

ADJUS TMENT OF DEFLECTION C IRCUIT

Item

V. HEIG HT V. CENTER adjus tme nt

Screen size

(90%)

H. P OSITI ON adjus tme nt

Measuring

instrume nt

Signal generator

Screen si ze

Picture size (100%)

Signal generator

Test point Adjustment part Description

D05 V P HAS E D07 V SI ZE

V. CENTER SW (S14 21) [MAIN PWB]

D03. H POSITION 1. Recei ve th e cross -hatch sign al.

Pictu re size

(10 0%)

1. Rec ei ve th e cross -hatch sign al.

2. Ad ju s t t he CENTER SW S1421 to become the signal center ag re e with the C R T verti cal c ent er .

3. T he n adjust th e D07 V SIZE to t he vert ic al sc re en s ize of th e scr een to p to 9 2%. ( B ott om of sc r ee n i s to be loc ate d wi th in

the 83% ～93% range ).

No Se tting it e m Variabl e

range

D05 V PHASE

D07 V SIZE 0～127 60

2. Adjust H. POSITION of left-right center with D 03 . H POSI TION.

3. Adjust by H POSITION to symme trical

0～7

Initial setting

value

No Se tting it e m Variabl e

range

D03 H. POS ITIO N

0～31

Initial setting

value

No. 51946

Page 21

ADJUS TMENT OF WHITE BALANC E

Item

WHITE BALANCE (Low Light) adjus tme nt

Measuring

instrume nt

Signal generator

BRI GHT

***

Test point Adjustment part Description

[LOW LIGHT]

***

R CUTOFF (S11) G CUTOFF (S12) B CUTOFF (S13)

BR IG HT (S 01)

SCREEN VR

[ in HVT]

V-27D50

1. Recei v e th e bl ac k an d w h it e sign al ( colo r off ).

2. Se lect t he [LOW LIGHT] MOD E f r om th e SE RVIC E MENU.

3. Set the initial setting value of “R CUTOFF”, “G CUTOFF” “B CUTOFF” and BRIGHT.

4. Disp l ay a si ng le horiz o nta l lin e by p r es sing t he ①①①① key of the

remote control unit.

5. Turn t he scr een VR a l l the way t o t he left.

6. Turn th e s creen V R gra du all y t o the righ t from th e l eft u ntil eith er o ne of the red, blu e o r g r een co l ors appea rs f aintl y.

7. Adju s t th e tw o c ol or s whic h d id no t a ppe ar until th e s i ng l e h orizo ntal l in e t hat is di spla yed bec omes w hit e using the ④④④④ to

⑨⑨⑨⑨ keys o f th e re mo te c ontrol un it .

8. Turn th e scr ee n VR u ntil the s i ng l e hor i zon tal li n e i s di spla yed

fain tly.

9. Pr es s the ②②②② key to cancel the single horizontal line mode.

10 . Ad jus t th e BR IG HT lev el to bec om e th e blac k c ompon en t

shines white slightly.

11 . C onf irm that whet her the co l or i ng r edi e nt of R ,G, or B is vi s i ble

to th e b l ack c o mp one nt, w hich shine s whi te slightly

12 . When the c ol o r in gr ed ient can be seen , t wo colors o ther tha n a

visible color are adjusted, and it is made to look white.

13. Return the value of BRIGHT to initial s etting value.

REMOTE CONTRO L UNIT

H. LI NE ON EX I TH. LI NE OFF

1 2 3

R CU TOFF B CUTOFFG C UTO FF

●

③③③③

The

EX IT key is the cancel key for the W HITE BALANCE.

No Setting item

Variabl e

range

Initial setting

value

S11 R CUT OFF 0～255 30

S12 G CUT OFF

S13 B CUT OFF

S01 BRIG HT

987

0～255

0～127

No.51946

Page 22

V-27D503

WHITE BALANCE (High Light) adjus tme nt

Signal generator

[HIGH LIGHT]

***

R DRI VE ( S1 4) B DR I VE ( S1 5)

1. Recei v e th e bl ac k-a nd -w hit e sign al ( color off ).

2. Se lect t he [HIGH LI GH T] M ODE in the SE RVIC E MENU.

3. Set the initial setting value of “R DRI VE” and “B DRIVE” with

④④④④, ⑥⑥⑥⑥, ⑦⑦⑦⑦

the

4. Ad ju st th e screen unti l i t b ecom es w h it e usi ng th e

⑨⑨⑨⑨

an d

keys of the r emot e contr o l uni t.

●The ③③③③ EX IT key is the cancel key for the W HITE BALANCE.

Settin g ite m Va riabl e

S14 R DRI VE

⑨⑨⑨⑨

and

k eys of the rem ot e contr o l uni t.

Remote Control Unit

①

key : H.LINE ON

②key : H.LINE OFF ③key : E XIT ④key : R DRIVE ▲ ⑥

key : B DRIVE

⑦key : R DRIVE ▼ ⑨key : B DRIVE ▼

▲

range

0～127

④④④④, ⑥⑥⑥⑥, ⑦⑦⑦⑦

Initial setting

value

SUB BRI GHT adjus tme nt

No Se tting it e m Variabl e

S01 BRIG HT

SUB CONT RAST

adjus tme nt

No Se tting it e m Variabl e

range

0～127

range

S15 B DRIVE

S0 1. BR I G HT 1. R eceive the b road cast.

2. Select S0 1. BRI G HT of th e V /C MODE.

3. Set the in it ial s etting valu e o f the S01. BRIGH T with t he

MENU / (VOL-/+) key.

4. If the brightness is not the best with the initial setting value,

make fine a dj ustm en t of th e S01. BRIGHT unt il you ge t the

Initial setting

value

S02. PICTURE 1. R eceiv e the b road cast.

Initial setting

value

op ti mu m br i ght ness .

2. Select S0 2 . PI CT URE of the V/C M ODE.

3. Set th e i n itial s e tti ng v alu e of th e S0 2. PICT URE with the MENU / (VOL-/+) key.

4. If the contrast is not the best with the initial setting value, make fin e adj ust me nt of th e S02. PICTURE until you get the

optimum contrast.

0～127

S02 PICTU RE

0～127

No.51946

Page 23

V-27D50

Item

adjus tme nt

Measuring

instrume nt Signal generator

Remote

control unit

generator

Oscilloscope

Remote

control unit

Test point Adjustment part Description

[ Method of adjustment without measuring instrument ]SUB COLOR

1. Recei v e th e b r oad cast.

2. Select S03. COLOR of the V/C M ODE.

3. Set the initial setting value of the S03. COL OR wit h the

MENU / (VOL-/+) key.

4. If t he c ol or i s n ot t he best with th e I nitial s e tti ng v alu e, m ak e

fin e a djust ment of the S0 3. COLOR unt il you get t he o ptimum color.

S03 COLOR 0～127 55

[ Method of adjustment using measuring instrum ent ]Signal

1. Se t 9.RF AFC t o OF F wi th SER VI CE M ENU

2. R eceive the b road cast.

3. Select S03. COLOR of the V/C M ODE.

4. Set the initial setting value of the S03. C OL OR wi t h t he

MENU / (VOL-/+) key.

5. C on nec t the osc illosc ope be twee n TP-B and TP-E.

6. Ad ju s t C OL OR and b ri n g the valu e of

7. C ha nge back 9.R F AFC t o ON with SERV ICE MEN U.

Setting item

th e vo lt age sh ow n in th e table be llo w.

Variabl e

TP-B TP-E(#### )

[CRT SOCKET

PWB]

S03. COLOR

9.RF AFC

range

Initial setting

value

(A)

in the illustration to

W-B

Models

AV-27 D5 03/ S + 15V

AV-27 D5 03/ R +18V

(A)

(－)

(＋)

No. 51946

Volt age

Page 24

V-27D503

(B)

(－)

Item

SUB TINT adjus tme nt

Measuring

instrume nt

Signal

generator

Remote

control unit

generator

Oscilloscope

Remote

control unit

Test point Adjustment part Description

[ Method of adjustment without measuring instrument ]

1. Recei v e th e b r oad cast.

2. Select S04. TINT of the V/C M ODE.

3. Se t the initi al s etti ng v al u e of t he S04. TI NT with the MENU / (VOL-/+) key.

4. If the ti n t is not th e bes t with the initia l set ting val u e, m ake fine ad justmen t of th e S04. T INT u ntil yo u g et t he optim um ti nt.

Setting item

S04 TINT

[ Method of adjustment using measuring instrum ent ]Signal

1. Se t 9.R F AFC t o OF F wi th SERVI CE MENU.

2. R ec eive the b r oad cast.

3. Select S04. TINT of the V/C M ODE.

4. Se t the initia l s ettin g value of th e S0 4. T I NT with the MENU / (VOL-/+) key.

5. Con nect the os c illosc ope be tw ee n TP-B and TP-E.

6. Ad ju st TI NT an d bring th e valu e of (B) in th e il lustration to the

voltage shown in the table bellow.

7. C ha nge back 9.RF AFC t o ON w ith SERV ICE MENU.

Variabl e

0～127

TP-B TP-E(#### )

[CRT

SOCKET

PWB]

S04. TI NT

range

Initial setting

value

CyG

BRY

(＋)

W-Mg Models

AV-27 D5 03/ S + 6V

AV-27 D5 03/ R +7V

Volt age

No. 51946

Page 25

ADJUS TMENT OF PIP CIRCUIT

(

)

Item

PIP WHIT E BALANCE

adjust ment

HIGH LIGHT

Measuring

instrument

Signal

generator

Test point Adjustment part Description

PIP 08 R DRIVE

PIP 10. B DRIVE

V-27D503

1. Recei ve the bl ack- and-white signal .(Color of f)

2. Sel ec t the PIP 08 R DRIVE, PIP 10. B DRIVE of th e P IP SE RV I CE MO DE .

3. Set the corr espon ding initial s et ting valu es wit h th e

MENU / (VOL-/+) key.

4. Ad jus t the PIP 08 R DRI VE, PI P 10. B DRIVE un til t he scr een beco mes white.

PIP DISPLA Y POSITI ON

adjust ment

Signal

generator

PIP screen

PIP 1 1 L POSI

PIP 1 2 R POSI

PIP 1 3 UPR POSI

PIP 1 4 LWR POS I

Setting item

PIP 0 8 R DRIV E

PIP 1 0 B DRIVE

1. Recei ve the bl ack- and-white signal .(Color of f)

2. Sel ec t t he PIP 11 L POSI of the P IP SER VIC E M ODE.

3. Set th e initial set ting value of the PIP 1 1 L POSI with the MENU / (VOL-/ +) key.

4. Ad jus t t he PIP 11 L POSI so t hat the position of th e P IP screen

edg e of upper w ill be at Y1 as s hown.

5. Adju s t the cor r espon di ng m odes of PIP 12～PIP 14 with the

sam e s teps as 2～4 a bove.

No .

Setting item

Variable

range

0～255

Variable

range

Initial setting

value

Initial setting

value

Y1 Y2

PIP 1 1 L POSI (Y 1)

PIP 1 2 R POSI ( Y2 ) 0～25 5 15

PIP 1 3 UP R POS I (X 1) 0～12 7 12

PIP 1 4 LWR POSI (X2) 0 ～12 7 11

0～25 5

No.51946

Page 26

V-27D503

ADJUS TMENT OF MTS CIRCUIT

Item

MTS IN PUT LEVE L

che ck

MTS

SE PARATIO N adjus tme nt

Measuring

instrume nt

TV audio

mult iplex signal generator

Oscilloscope

Test point Adjustment part Description

A01 IN LEV EL 1. Se lec t t he A01 IN LEVEL of the SOUND MODE.

2. Verif y that the A01 IN LEVEL is set at its initial s etting value.

No Se tting it e m Va riab l e

A01 IN LEVEL

R OUT

L OUT [AUDIO OUT]

A02 LOW SEP.

A03 HI SE P.

1. Inp ut th e ste reo L s igna l (30 0H z) f r om the TV au di o m ul ti pl e x

si gn al g ene r ator t o the ant enna term in al .

2. Connect an oscilloscope to R OUT pin of the AUDIO OUT, and disp lay on e c ycle p ort ion of t he 300H z si g nal.

3. Se lec t t he A02 LOW SEP. of the SOUND MODE.

4. Set the initial setting value of the A02 LOW SEP. with the

MENU / (VOL-/+) key.

5. Ad jus t t he A02 LOW SE P. so that the stroke element of the

300Hz signal will bec ome minimum.

6. Cha nge the con nect ion of th e os cil lo scop e t o L OUT pi n of th e

AUDIO O UT , and enl ar ge the vol t age ax is.

7. Cha nge t he sig nal to 3 kHz, an d si milarly a dj us t t he A0 3 H I

SE P.

range

0～15

Initial setting

value

L- Chann el signal wave form

1 cycle

R-C hannel crosstalk por ti on

Mi n i m u m

Setting item

A02 L OW SEP .

A03 HI SE P.

Variabl e

range

0～63

0～63 32

Initial setting

value

No. 51946

Page 27

ADJUSTMENT OF PURITY / CONVERGENCE

PURITY ADJUST MENT

1. Dem ag ne tize CRT w it h t he dema gn etizer.

V-27D50

2. L oose n the r e tain er scr ew of th e d eflec tion y oke .

3. Rem ove th e wed ges.

4. Inp ut a g r een rast er sign al fr om the si gn al ge nerat or , an d tur n

th e scr een t o gr een r aste r.

5. Move the deflection yoke backward.

6. Bring t he lo ng l ug of th e p urity m agnets on the sho rt lu g a nd p osition t he m horizon tall y. ( F ig. 2)

7. Ad ju st t he ga p be tween two l ug s so that th e GREEN RAS TER will come into the center of the screen. (Fig.3)

8. M ove the deflec t ion y oke for w ar d, a nd fix the pos iti o n of th e deflection yoke so that the whole screen will bec ome green.

9. Ins ert th e we dg e t o th e t op s ide of the def lect ion yo ke so that it will not move.

CR T

P/ C MA GN ETS

WEDGE

DEFLECTION

P / C

MAGNET S

P : PURITY M AGN E T 4 : 4 P OLES (con ver gen c e m agn ets) 6 : 6 P OLES (con ver gen c e m agn ets)

Fig.1

PURITY MAG NETS

YOKE

10 . Inp ut a cross hat ch sig na l.

11 . Ve rif y that th e scre en is hor i z on tal.

12 . Inp ut r ed and b l ue r ast er sign al s, a nd m ak e sur e tha t purity is

prop er l y ad juste d.

Long lug

Short lug

(FRO NT VIEW )

Bring the long lug over the short lug and position them horizontally.

Fig.2

GREEN RASTER

CEN TER

Fig.3

No. 51946

Page 28

V-27D503

STAT IC CONVERGENCE ADJUSTMENT

1. Inp ut a cr oss hatch s ig na l.

2. Us in g 4 - po le c on v er ge nc e m agn ets , ove rlap t he re d and bl u e

lines i n th e cen ter of th e screen (Fig. 1) a nd tu rn the m to mag ent a (r ed/ blue ).

3. U s ing 6- p ol e con verge nce ma gn ets, ove rla p th e m age nta

(red/b l ue) an d gree n lines in t he c ent er of th e s creen an d tu rn them to white.

4. Rep eat 2 and 3 ab ove, an d ma ke best c onver ge nce.

DYNAMIC C ONVERGENCE ADJUSTMENT

1. Move th e d ef lec tion yok e u p an d d own and o verlap th e lin es in

the periphery. (Fig . 2)

2. M ove th e deflec ti on yoke left to ri gh t and over lap the lines i n the

p erip her y. (Fi g. 3)

3. Rep eat 1 and 2 ab ove, an d ma ke best c onver ge nce.

(FRO NT VIEW )

BLUE

GREEN

RED

Fig.1

GREEN

BLUERED

RED

GREEN

BLUE

●

After ad justmen t, f ix the wed ge at the origin al p osition .

Fas t en the r eta in er s crew of th e d ef lecti on yoke . Fi x the 6 magn ets with g lue.

(FRO NT VIEW )

GREEN

RED

BLUE

GREEN REDBLUE

Fig.2

Fig.3

BLUE

GREEN

RED

RED GREEN

BLUE

GREEN

RED

No. 51946

Page 29

HOW TO CHECK THE HIGH VOLTAGE HOLD DOWN CIRCUIT

1. HIGH VOLT AGE HOLD DOWN CIRCUIT

After repairing the high voltage hold down circuit.

Thi s ci r cuit sh all b e ch ecked to op erat e co rrect ly .

2. CHECKING OF THE HIGH VOLTAGE HOLD DOWN CIRCUIT

(1) Turn the power sw ON. (2) As shown in figure bellow, set the resistor (between【S1 】co nne ctor 【2】&【3】).

(3) Make sure t hat the sc r ee n p ic ture di sap pe ar s .

(4) Temporarily unplug the power cord. (5) Remove the resistor (between【S1 】co nne ctor 【2】&【3】).

(6) Ag ai n pl ug the p ower co rd , m ake sur e tha t th e nor m al p ict ure is d isplaye d on t he s cree n.

RESISTOR AV-2 7D50 3/S ,R : 2 4.7 kΩ±

V-27D50

Ω±0.5% 1/4W

Ω±Ω±

D551

R557

No. 51946

Page 30

V-27D503

REPLACEMENT OF CHIP COMPONENT

CAUT IONS

1. Avoid heating for more than 3 seconds.

2. Do n ot rub t he el ec t ro des an d t he r esis t p arts of the p att er n.

3. W hen rem ovi ng a c hi p par t, m el t th e s older ad equate ly.

4. Do n ot reuse a ch i p p ar t afte r re mo ving it .

! SOLDERING IRON

1. Use a hig h i ns ulatio n s older i ng iron with a t hin po in ted e nd of it .

2. A 3 0w s oldering i r on is r ecommend ed for easil y r em oving par ts.

! REPLACEMENT STEPS

1. How to remove Chip parts

$$$$ Resi st o rs, capacit ors , etc

(1) As sh own in the f ig ur e, pu sh th e pa rt w ith tw ee zer s and

alte rn at ely melt the s ol de r at eac h end.

(2) Sh if t with tweeze rs and r em ove th e c h i p p art.

$$$$ T rans isto rs, d io des , va ria bl e r esist or s, etc

(1) Ap pl y e xt ra so ld er to eac h le ad .

SOLDE R SO LD ER

2. How to install Chip parts

$$$$

Resi st o rs, ca pacit o rs , etc

(1) Apply solder to th e patt ern a s i ndicated in the fi g ure.

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

The n hea t and me lt th e so lder a t both ends of t he chi p part.

$$$$ T ran s isto rs, dio d es , va ria bl e r esist or s, etc

(1) Apply solder to th e patt ern a s i ndicated in the fi g ure. (2) Grasp the ch ip p art wit h t weeze rs and p lace it on the s o l der .

(3) First s older lead A as indica ted in t he figure.

(2) As sh own in the f ig ur e, pu sh th e pa rt w ith tw ee zer s and

alte rn at ely melt th e sol d er at each le ad . S hi ft an d r em ove the chip part.

Note : A fte r re moving t he part, r emove rem ain ing solder fr o m the

pattern.

(4) The n solder le ads B and C.

No.51946

JVC AV-27D503/R, AV-27D503/S Service Manual

CONTENTS

SPECIFICATIONS

SAFETY PRECAUTIONS

FEATURES

HOW TO IDENTIFY MODELS

SPECIFIC SERVICE INSTRUCTIONS

SERVICE ADJUSTMENTS