JVC AV25BT6 Schematic

B

SERVICE MANUAL

COLOUR TELEVISION

AV25BT6ENS

AV25BT6ENB

AV-25BT6ENS
AV-25BT6EN

CONTENTS

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

SAFETY PRECAUT IONS

!

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

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

SPECIFIC SERVICE INSTRUCTIONS

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

★

OPERATING INSTRUCTIONS

★

STAND ARD CIRCUIT DIAGRAM

1

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

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

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

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

････････････････････････････････

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

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

･･･････････････････････････････････

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

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

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

････････････････････････････････

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

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

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

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

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

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

････････････････････････････････

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

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

COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

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

････････････････････････････････････ 21

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･･･ 5

･･････

･･･････････････････････ 5

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･････････････････････ 10

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2- 1

4

6

No.520 56
Jul. 200 2

A

V-25BT6ENS

A

V-25BT6ENB

SPECIFICATIONS

Content

ITEM

Dimensions ( WxHxD) 69 cm x 5 4 cm x 47 cm

Weight 27 kg

TV RF System B/G

Colour Syst em

Teletext System Fast ext / Toptext

Stere o Sy st em German + NICAM

Tuning System Fr equenc y Synt hes iz er T un in g S ystem

Numb er Of CH me mory pos ition 10 0 ch

Receiving Frequency

Intermediate Fr equency

Colour Sub Carrier Frequency PAL (4.43MHz), SECAM (4.43MHz), NTSC (3.58MHz/4.43MHz)

Aerial Input Terminal 75 Ohm U n bala nced

Power Input AC 2 20V ~ 240V, 50H z

Power Consumption 135W(Max.) 1.8W (stand by)

Pictur e Tube Visi bl e size : 59cm ( M eas u r ed d iago na lly)

Hi gh Vo l t ag e 30 .45kV

Speake r 5.7 X 16 cm Oval type X 2

Au dio Output 10W + 10W

Input

Output

Remote Control Unit VE -3 00 17763 (R M-C11 00) , Batte ry s ize :AA /R 06 dry b att er y x 2

TV Mode PA L

Video Mode PAL / NTSC 3 .58 / NTSC 4 .43

VHF (VL) 46 .25 MH Z ~ 1 68. 25MH z

VHF (VH) 17 5.2 5MH z ~ 46 3.2 5MHz

UHF 47 1.2 5MH z ~ 863.2 5MH z

CATV S01-S 4 1 & S7 5- S79

VIF Carrier 38 .9 MHz

32.4 MHz (6.5 MHz)

SIF Carrier

Vide o 1Vp-p, 75 Ohm

S/V ideo

Au di o (L/R)50 0 mV r ms, High I mp edance

Vide o 1 Vp -p, 75 Ohm

Au di o (L/R)50 0 mV r ms, L ow Imped ance

Rear Sid e

Front Side AV 3 ( Vid eo/A ud i o)

Front Side Hea dph on e jac k (S ter e o mi ni jack 3.5∅)

Rear Sid e

32.9 MHz (6.0 MHz)

33.4 MHz (5.5 MHz)

Y: 1Vp -p Posi ti v e
C: 0. 286Vp -p

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

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

AV1 (V ideo/Au dio)Output Terminal

AV2 ( V ideo /Au dio) ( S electe d T V, AV1 o r AV3 )

AV-2 5BT 6EN S (S ilver)
AV -2 5BT 6EN B (Bl a ck )

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

2

No.52056

A

V-25BT6ENS

A

V-25BT6ENB

■■■■21-pin Euro connector (SCART socket) : AV1 / AV 2

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

Pin

Signal Designation Matching Value AV-1 AV-2

No .

1 AUDIO R o utput 50 0m Vr ms(Nomina l) ,L ow impe dan ce

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

3 AUDIO L outp ut 50 0m Vr ms(Nomina l),L ow i m pe dance

4 AUDIO G ND

5 GND (B) ○○

○

(TV OUT)

○

(TV OUT)

○○

○

(TV/LINE OUT)

○

(TV/LINE OUT)

6 AUDIO L input 500mVrms(Nominal), High impedance

B-W

7B input

FUNCTON SW

8

(SLOW SW)

9 GND (G)

10 - NC -

11 G in put

12

- NC -

13 GND (R)

14 GND (YS) ○ NC

15 R / C input

16 Ys i n put L ow : 0 – 0.4, Hig h : 1 - 3 V, 75 Ω○NC

17 GND(VIDEO output)

18 GND(VIDEO input) ○○

19 VID EO outpu t

20 VIDEO / Y inp ut 1V

70 0m V

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

70 0m V

R : 700mV
C : 300mV

1V

, 75Ω○

B-W

, 75Ω○

B-W

, 75Ω

P-P

, 75Ω

S-W

(Negative going sync), 75Ω

S-W

(Negative going sync), 75Ω○○

○○

NC

○

○○

○○

○

(R/C)

○○

○

(TV)

NC

NC

○

(only C )

○

(TV/LINE OUT)

21 COMMON G ND

○○

[Pin assignment]

No.52056

3

A

V-25BT6ENS

A

V-25BT6ENB

SAFETY PRECAUTIONS

1. The design of th is prod uct con ta in s sp eci al har d ware , many
circuit s and components specially for saf ety purposes. For
con tinu ed pr ot ecti on , n o chan g es sh ould b e ma de to the o rig i nal

d esign un less a uth or ized in writi n g by th e manu fac t urer .
Replacem ent p arts m ust b e i d entic al to thos e u sed in th e or i gi n al
ci rcu its. Se r v ic e s h ou ld be pe rf or me d b y qua li fi e d per so nn el
on ly.

2. Alte r ation s of the desi g n or circui tr y of t he prod ucts s h oul d not be
made. Any design alterations or additions will void the
manu fac t urer 's warra nt y and will f urth er r el i eve t he ma nufac tu rer
of r esp onsib ili ty for per s o na l injury or pr operty d am ag e res ul t ing
th erefr om.

3. Man y e l ectr ical an d mech ani c a l p ar ts i n th e pr od ucts ha v e
special safety-related chara cteristics. T hese characteristics are
oft en no t e vi den t f r om v i sua l insp ecti on nor ca n t he pro tect io n
aff orde d by th em nece ssarily be ob tain ed b y u s in g r ep l ac em en t
com po nents rated for hig he r vo l tag e, watt age, etc . R ep lac em en t

p arts whic h have th ese sp ecial s afet y ch ar act erist ics ar e
ide ntified in the parts list of Ser vic e manua l. El ectric al

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

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

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

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

Some model's power circuit is partly different in the GND. The
diff er enc e of the GND is sh ow n b y th e LI VE si de G ND, th e
ISO LATE D(N EU TR AL) sid e GND and EARTH side GND. Don' t
sh ort b etw ee n the L IVE side GND a nd IS OLATE D(NEUTR AL)

si de GN D or EARTH si de GND an d ne v er meas ure with a
measu rin g app aratu s (osc illosc ope et c.) th e LIV E sid e GND an d
ISOLATED(NEUTRAL) side GND or EARTH side GND at the
same time.
If above not e will not be kept, a fuse or any parts will be broken.

5. If any repair has been made to the chassis, it is recommended
th at t he B1 set ting shou l d b e c h ec ked or adju ste d ( Se e
ADJUSTM ENT OF B 1 POW E R SUPPLY).

6. The hi gh vol ta ge app lie d t o th e pi ctu r e tu be mu s t c on form wit h
th at sp ecifi ed i n S ervi ce man ual . E xc essi ve h i gh volt ag e c a n
cau se an i ncr e ase i n X- R ay em iss i on , arci ng an d possi b le
component damage, therefore operation under excessive high
voltage conditions should be kept to a minimum, or should be

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

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

7. Do not c hec k hi gh volt ag e by dr aw i ng an arc. Use a hi gh volt age
meter or a hig h v oltag e pr ob e wit h a V TVM . Discha rg e th e

picture tube before attempting meter connection, by connecting
a cl i p le ad to th e gr ou nd f rame a nd c onn ecti n g th e oth er end of
the lead through a 10kΩ 2W resi s to r to the anod e butt on .

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

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

9. Isolation Check

(Safety for Electrical Shock Hazard)

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

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

(1) Dielectric Strength Test

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

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

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

(2) Leakage Current Check

Plug th e AC l in e c ord d irect ly into the A C ou tlet ( d o not use a lin e
isol ati o n transf orm er du r ing this ch eck.). U sin g a " Lea kag e
Current T este r", me as ur e th e l ea k ag e cu rr e nt f rom eac h ex p os ed
metal p ar t of the cabine t, p art icu lar ly any e x pos ed me tal p art
h aving a re turn pa th to the ch assis , to a kn own go od ea rt h

grou nd (w a ter pip e, e tc.). An y l eaka ge c ur r en t must n ot e xceed

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

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

Plug th e AC l in e c ord d irect ly into the A C ou tlet ( d o not use a lin e
isol ati o n tran sfor m er dur i ng this c he c k.). Use an AC vo lt meter
h aving 1 00 0 oh ms pe r vol t or mor e s ens it i vity i n th e fo llowi ng
mann er . C on nec t a 1 50 0Ω 10W res ist or par a lle le d b y a 0 .1 5µF

AC-type c apa cit or bet ween an expo sed met al pa rt and a kno wn
g ood e ar th gr o und (water pi pe , etc.) . M eas ur e th e A C volt ag e
acr os s th e res ist or wi th th e AC vo l tm eter. Move th e r es i stor

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

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

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

0.15μF AC -T YPE

PLACE THIS PROBE

1500 Ω 10W

GOOD EARTH GROUND

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

4

No.52056

A

A

FEATURES

V-25BT6ENS
V-25BT6ENB

1. It is a remote controlled color television.

2. 10 0 prog r am s fr om VH F, UHF b an ds or cab l e cha nn els can be

pres et.

3. It c an tun e cable cha nn el s.

4. Cont ro l lin g th e TV i s ver y eas y by i ts m en u dr i ve n s yst em .

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

6. F r ont AV Inp ut avai l a ble.

7. St ereo s ound s ystem s ( Ger m an + Nic am ) ar e a vailab le.

8. Full fu ncti o n Tele text (Fast ext, Topte xt).

9. It i s possi b le to connec t head ph on e.

10. Direct channel access.

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

14 . Au tom at ic sou nd mu te when no tran smiss i on .
15 . 5 minu tes aft er the br o adc asti ng ( c l osed own) , the TV s witc h es

16. Child Lock.

MAIN DIFFERENCE LIST

!!!!

Parts Name

!

POW E R BUTTO N VE -2 00 43532 VE -2 00 00903

MODEL No.

AV -2 5 B T 6 EN S

(Silv er)

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

AV -2 5 B T 6 EN B

(Bl ack )

! FRON T CABIN ET VE -200 46446 VE -2 00041 31

!

FU NCTION B UTTO N VE -2 00 43545 VE -200 03730

! REAR C OVE R VE -2 00 92523 VE -201 01575

CARTON BOX VE -500 28494 VE -5 00 28507

! RAT IN G L ABE L VE -2 01 02134 VE -201 02164

No.52056

5

A

V-25BT6ENS

A

S

C

V-25BT6ENB

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Rem ove th e 8 screws marked A.

2. Rem ove th e 2 screws marked B.

3. W ithdr a w t he r ear c o ver to wa rd y ou .

REMOVING THE MAIN PWB ASS’Y

" Af ter removing the rear cover .

1. Yo u c an pull o ut the MA IN PW B ASS’Y.

REMOVING THE HEADPHONE PWB ASS’Y

" Af ter removing the rear cover.

1. Rem ove th e 1 screw marked C.

2. Remove th e H EA DP HO NE PWB AS S’Y & BRACK ET.

REMOVING THE SPEAKER

"

1. R em ove th e 4 screws marke d D.

2. Remove the SP EAK ER.

REMOVING THE FRONT CONT ROL PWB

" After removing the rear cover.
"

1. R em ove the 4 screws marked E a nd r em ov e th e FR ONT

REMOVING THE POWER SW

"
" Rem ove the M AIN PW B AS S’Y.

"

MAIN PWB

After removing the rear cover.

Remove th e M AIN PW B AS S’Y.

CONTROL PWB.

After removing the rear cover .

Remove the 2 screws marked F, and remove th e POW ER SW.

A

B

PEAKER

F

POWER S W

RT

AV

TERMINAL

BOARD

D

REAR COVER

E

FRONT CONT ROL PWB

C

BRACKET

HEADPHONE
PWB

FRONT CABINET

6

No.52056

A

A

REPLACEMENT OF CHIP COMPONENT

! CAUTIONS

1. Avoid heating for more than 3 seconds.

2. Do n ot ru b the elect ro des an d the r esist p arts of the p att ern.

3. W hen r em oving a chip par t, mel t th e s older ad equately.

4. Do n ot reuse a ch ip p ar t afte r re mo v ing it .

! SOLDERING IRON

1. Use a hig h i ns ulatio n s ol der i ng i r on with a thi n poin ted e nd of it.

2. A 3 0 w s older i ng iron is r ec ommend ed for easily r em oving p ar ts.

!

REPLACEMENT STEPS

1. How to remove Chip parts

# Resi st ors, ca pa cit o rs , etc .

(1) As s ho wn in th e figure, pus h the pa rt with tw ee zer s a nd

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

V-25BT6ENS
V-25BT6ENB

2. How to install Chip parts

# Resi st ors, ca pa cit o rs , etc .

(1) Apply sold er to the patt ern as ind ic ated in the fig ure.

(2) Sh if t w i th tw eeze rs and r em ove th e c h i p p art.

#

Trans ist ors, diodes , varia bl e r esistor s, etc.

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

SOLDE R

(2) As s ho wn in th e figure, pus h the pa rt with tw ee zer s a nd

alte rn at ely m elt the sold er at e ach l e ad . Shift and r em ove

the chip p art.

SOLDE R

(2) Gr asp th e ch i p p art wit h t weez ers and p l ace it on th e

sol d er . Th en h eat and me lt the so lder at b oth e nds of the
chip part.

#

Trans ist ors, diodes , varia bl e r esistor s, etc.

(1) Apply sold er to the patt ern as ind ic ated in the fig ure.

(2) Gr asp th e ch i p p art wit h t weez ers and p l ace it on th e

solder.

(3) First s older lead A as indicated i n t he figu re.

A

B

C

(4) The n so ld er l e ads B and C.

A

B

Note : After removing the part, remove remaining solder from

the p atte rn.

No. 52056

C

7

A

V-25BT6ENS

A

VALUE
VALUE

ITEM
MENU

MU T I NG

INFORMATION

COLOUR k

V-25BT6ENB

MEMORY IC REPLACEMENT

1. Memory IC

This model use a memory IC.
Thi s me mo r y I C st or es d ata for pr op er op er ati o n of the vid eo

an d d ef lecti on c ircu it s.

When replacing, be s ure to use an IC containing this (initial
valu e) data.

2. Memory IC rep lacemen t procedure

(1) Power off

Switch of f t he p ow er an d dis con nec t th e power co rd from
the wall outlet.

(2) Replace the memory IC

Init ial value m ust be entered into the n ew IC .

(3) Power on

Connect th e pow er c or d t o the wa ll o utlet an d s witc h on t he

power.

SE RVICE MENU

Fig.1

SERVICE MENU SELECT KEY

(4) SERVICE MENU setting

1) Pr ess MENU key and, while the displayed MENU

screen, press 4, 7, 2, 5 key on th e rem ote co ntrol uni t or
press MUTING key and INFORMATION key at the

simult aneously.

2) The SER V ICE M ENU sc r ee n of F i g.1 is d isp l ay ed .

3) Ve rif y what to s et i n the SER V ICE M EN U , and set

what ever is nec e s sary (Fig.1 ). Ref er to th e SE RVICE
ADJU STM ENT for settin g.

4) Press the STANDARD key to exit SERVICE MENU.

(5) Rec eiv e channel setting

Refe r to the OPERATIN G I N STRUCTIO NS ( USER ’S

GUID E) a nd set th e rece ive ch an nel s (Chan n els Pr eset ) as
described.

(6) User se tt ing s

Check th e us er s ett ing it ems ac c ordi ng to aft er pa ge .
Wher e th ese d o not a gr ee, r efer to t he OPE RAT ING

INSTRUCTIONS (USER’ S GUIDE) and set th e items as
described.

ITEM
SELECT(▲)

SELECT(－)

FUNCTION

POWER

NUMBER

STANDARD

ey

SELECT(＋)

SELECT(▼)

Fig.2

8

No. 52056

A

A

SETTING OF THE LAST MEMORY FOR SHIPMENT

■■■■ USER SETTING VAL UES

Setting Item Setting Value Setting Item Setting Value

SOUND MENU FEATURE MENU

BA LANCE CEN TER SL EEP TIMER OFF

BA SS

↑

CHILD LO CK OFF

V-25BT6ENS
V-25BT6ENB

TR EBL E

MODE STEREO AV-2 OUTPUT TV

EFFECT OFF

PICTURE MENU INSTALL

BRIGHTNESS PROGRAMME

CONTRAST BAND

COLOUR CHANNEL

SHAR PNES S SE ARCH

HUE (only NTSC)

PICTURE MODE AUTO STO RE

■■■■

SETTING APS BIT IN SERVICE MENU

1) En ter s er vic e me nu i n TV m ode by pr essi ng “IN FOR MA T ION” a nd “ M UTI NG” ke ys s i mu ltan eously. S er vic e M en u will ap pea r.

2) Se le c t T X1 (TEL ET EXT OPT IO N) b y pr essi n g Up /D ow n keys o n r em ot e c ontr o l un it.

3) Press the 7 key on remote control unit to set APS bit. (After this, bit 7 of TX1 will be “1”)

4) Press STANDARD key on remote control unit to exit service mode.

NOTE : DO NOT TURN OFF THE TV BY USING POWER BUTTON O N THE FRO NT PANEL.

Thes e ad j us t a re aut om ati ca lly

restore d when AP S b it in Se rvice

menu i s set .

The proc edure f or s e tti ng AP S

bit is describe d bellow.

↑

LANG UAGE ENGLISH

Refe r to t he INSTRUCTI ON

BOO K

FINE TUNING

No. 52056

9

A

V-25BT6ENS

A

V-25BT6ENB

SERVICE ADJUSTMENTS

ADJUSTMENT PREPARATION:

1. You ca n ma ke t he ne ce ssa ry ad ju st me nts for t h is un it wit h
either the Remote Control Unit or With the adjustment tools

and parts as given below.

2. Adjustment with the Remote Control Unit i s made on the

basis of the initial setting va lues, however, the new setting
values which set the screen to its opti mum condition may

differ f rom the init ia l s ettings.

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

4. T ur n on the power for set an d test eq uip me nt bef or e use , and
start t he ad justmen t p roced ur es aft er w ai ti ng at least 30 minut es.

5. U nl ess o the r wise s pec if i ed, prep are t he most s u it able recep tion
or inp ut sign al for adjust ment.

6. Nev er tou ch any ad j ustm en t p ar ts wh ic h ar e n ot sp eci fied i n the
list for t his adjustment - variable resistors, transformers,

condensers, etc.

7. Pr esetti ng before ad j ustm en t.

Unl es s ot her w i se spec if i ed i n t he adjustme nt i nstr uct i ons , p r ese t

th e f ollo w ing f uncti ons with th e re mo te c ont ro l un it :

BRIGHT NES S

CONTRAST
COLOUR

SHAR PNES S

CENTER

ADJUSTMENT EQUIPMENT

1. DC voltmeter (or digital voltmeter)

2. Si gn al g ener at or (P attern g en erat or) ［PAL/SECAM/NTSC］

3. Remote control unit

MAIN PARTS LOCATIONS

LE D

REMO CON
RECEIVER

IC50 2

ME MO RY I C

VIDEO R L

AUDIO.

IC50 1

MI CO M

ADJUSTMENT ITEM

!

SCR EEN A DJUST MENT

! OSD HORIZONTAL POSITION ADJ USTMENT
!

IF ADJU STMENT

! AGC AUTO MATI CALLY A DJUSTM EN T
!

DEFLECTION CI RCUIT ADJUSTMENT

! GEO MET RY ME NU ADJUSTME NT
!

WHITE BALANCE ADJUSTMENT

ME NU

（＋）

（＋） （－）

（＋）（＋）

PROG

/Ch.

（－）

（－）（－）

（＋）

（＋） （－）

（＋）（＋）

VOL

（－）

（－）（－）

TOP

FRONT

FBT

SCAR T

jack

TUNER

AV -1 AV -2

10

SCAR T

jack

UPPER : FOCUS VR
LOWE R : SCREEN VR

No. 52056

A

A

BASIC OPERATION SERVICE MENU

■■■■ HOW TO ENTER THE SERVICE MENU

1) Pr ess the MENU key.

2) ME NU s c reen of fig.1 will b e d ispla ye d

MENU SCRE EN

MENU

SOUND
PICTURE
FEATURE
INSTALL

PROGRAM

V-25BT6ENS
V-25BT6ENB

REMOTE CONTROL UNI T key NAME

NUMBER key

Fig.1

3) W hil e the ME NU scr ee n is disp lay ed , p r ess th e 4,7 ,2, 5 k e y or

INFORMATION key and MUTING key simultaneously.

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

SE RVICE MENU

ADJUSTMENT ITEM SETTING VALUE

Fig.2

■ SELECTION OF ADJUSTMENT ITEMS

1) Enter th e SER VIC E ME NU

2) Press the FUNCTION / key and select the ADJUSTMENT

ITEM.

3) Pr ess the FUNCTION / ke y and s et t he SETTI NG VALUE.

■ HOW TO EXIT SERVICE MODE

1) Pr ess the STANDARD Key on REMOTE CO NTROL UNIT.

■ HOW TO ENTER THE GEOMETRY MENU

"

Thi s m o del is buil t- i n GEO ME T R Y M EN U f or ge omet ry

adjustment.

1) Enter th e SER VIC E ME NU

2) Press the GREEN key, geometry menu appears (Fig. 3).

3) Press the FUNCTION / key and select the ADJUSTMENT
ITEM.

4) Pr ess the FUNCTION / ke y and s et t he SETTI NG VALUE.

GEOME TRY MEN U

INFORMATION
key

AV key

" FUNC TI ON OF COL O UR k ey

RED key :

It switch es th e AV L to ON o r OF F mode on servic e

menu . AV L wo rd i s visible o n s er vice m en u when
AV L is o n.

GREE N k ey :

It s witch es t o GE OM ETR Y adjust menu. G eomet ry

of th e p ict ure i s a dj ust ed in th is m enu.

YELLOW key :

It s witch es t o VE RT ICAL SC AN DISA BLE mode.
It i s us eful t o adj ust scr een volt age.

BL UE ke y :

It i s used to adj ust AGC an d I F au to matical l y on

ser v ice me nu.

STANDARD
key

COLOUR key

MENU key

FUNCTION
key

GEOME TRY

VSIZ 023
VPOS 028
VSCO 000

VCCO 008
HSIZ 007

HPOS 039
HPIN 015

ADJUSTMENT ITEM SETTING VALUE

Fig.3

No. 52056

11

A

V-25BT6ENS

A

V-25BT6ENB

■

ADJUSTMENT ITEM & INITIAL (Recommended) SETTING VALUE in the SERVICE MENU

ADJUSTMENT
ITEM

OSD HORIZONTAL P OSI TION OF OSD 082

IF1 IF COARS E ADJUSTM EN T 004

IF2 IF FINE ADJUSTMENT 065

IF3 IF COARS E ADJUSTM EN T FOR L- P RI ME 004

IF4 IF FINE A DJUST MENT FOR L-PRIME 065

AGC AUTOM ATIC GA IN CONT ROL Autom at ic ally

VLIN VERTICA L L INEARITY Not used

RGBH RGB MODE HORIZONTAL SHIFT OFFSET 007

VSOF VE RTICA L S IZE OF FSE T for 60Hz -01

VP OF VE RTICA L PO SITIO N OFFSET f or 60 Hz -01

HSOF HORIZONTAL SIZE OFFS ET for 60Hz +00

HPOF H ORIZONTAL POSI TION OFFSE T for 6 0Hz +00

HTOF HORIZONTAL TRAPEZOID OFFSET for 60Hz +01

WR WHITE PO INT AD JUST MENT FOR RE D 040

WG WHITE POINT ADJUSTME NT FOR GREEN 040

WB WHIT E POINT AD JUST ME NT FOR BLUE 04 0

BR BIA S FOR RED 030

BG BIA S FOR G RE EN 031

APR AUTOMATIC RGB PEAK REGULATION THRESHOLD 010

BRI BR IGH TNES S 030

CON CONTRAST 035

COL COLO UR 038

SHR SHARP 006

HUE HUE 031

VOL VOLUME 015

WR-R WHITE PO INT ADJU STMENT for RED (R GBm o de) 030

WG-R W H IT E PO INT ADJUST ME NT for GR EE N (RGBm o de) 055

WB-R W H ITE PO INT ADJU STMENT for BL UE (RGBmo de) 032

FMP 1 FM PR ES CA LER W H E N AV L IS OFF Not used

NIP1 NICAM PRES CALE R W H E N AV L IS OFF Not used

SCP1 SCAR T PRES CA LER W HE N AV L IS OFF Not used

SE C1 SECA M PR E SCALE R W H E N AV L IS OFF N ot used

FMP 2 FM PRES CA LER W HE N AV L IS ON 013

NIP2 NICAM PRESCALER WHEN AVL IS ON 016

SCP2 SCAR T PRES CA LER W HE N AV L IS ON 013

SE C2 SE CAM PRE SCALE R WH E N AV L IS ON Not used

F1H HIGH BYTE OF VHF1-VHF3 CROSS-OVER FREQUENCY 00001001

F1L LOW BYTE O F VHF1- VHF3 C ROSS -O VER FREQ UE NCY 10010010

F2H HIGH BYTE OF VHF3-UHF CROSS-OVER FREQUENCY 00011011

F2L LOW BYTE O F VHF3- UHF CROS S-OVER FR EQ UE NCY 10 00 00 10

BS 1 BA ND SW ITCHING B YT E F OR V HF 1 0000 00 11

BS 2 BA ND SW ITCHING B YT E F OR V HF 3 0000 01 10

BS 3 BA ND SW ITCHING B YT E F OR U H F 10 00 01 01

CB CONTR OL B YT E 10 00 11 10

OP1 PERIPHERAL OPTIONS 01110101

DESCRIPTION INITIAL VALUE

1/2

12

No. 52056

A

A

■

ADJUSTMENT ITEM & INITIAL (Recommended) SETTING VALUE in the SERVICE MENU

ADJUSTMENT
ITEM

OP2 R ECEPTI ON STANDAR D OPTIO NS 00001001
OP3 VIDEO OPTI ONS 0110 1101

OP4 TV FE ATU RE S 10 00 10 00

OP5 CHANNE L TA BLES 00 00 00 00

TX1 TEL ETEXT O PTIONS 10010101

GEOM GEO MET R Y OPTIO NS 0000 0000

OP8 PIP PRES ET CH ANGE 00 00 00 00

DESC RIPTI ON INITIAL VA LUE

" [GEOME TRY MENU ]

V-25BT6ENS
V-25BT6ENB

2/2

ADJUSTMENT
ITEM

VSIZ VERTICA L S IZE f or 50Hz 030

VP OS VE RTICA L POSITIO N for 5 0Hz 010

CSCO VERTICAL S-CORRECTION for 50Hz Not used

VCCO VERTICAL CORNER CORRE CT ION for 50Hz Not used

HSIZ HORIZONTAL SIZE for 50Hz Not used

HPOS HORIZONTAL POSITION for 50Hz 03 5

HPIN HORIZONTAL PINCUSHION for 50Hz Not used

HCCO HORIZONTAL CORNER CORRECTION for 50Hz Not used

HTRP HORIZONTAL TRAPEZOID for 50Hz Not used

VZSZ VERTICA L ZOOM S IZE for 50 Hz Not used

DESCRIPTION INITIAL VALUE

No. 52056

13

A

V-25BT6ENS

A

Screen size

V-25BT6ENB

ADJUSTMENTS

■■■■ SCREEN ADJUSTM ENT

Item

SCREEN

adjust me nt

■■■■ OSD HORIZONTAL POSITION AD JUSTMENT

Item

HORI ZONTAL

POSITION O F
OSD

adjust me nt

Measuring

instrume nt

Remote

control unit

Measuring

instrume nt

Remote

control unit

Test point Ad justment part Description

SCREEN VR

[On the FBT]

Test point Ad justment part Description

OSD 1. En ter SE R VIC E M ENU.

SE RVICE MENU SCREEN

1. En ter SE R VICE MENU .

2. Press YEL LOW ke y to disab l e ve rt ic al s can .

3. Ad ju st SC R EE N VR. on the F BT a s th in as pos sible.

4. Pr ess YELLOW k ey ag ai n to en able v er ti cal sc an.

5. Pr ess STANDARD key t o le ave s ervic e m en u.

FOCUS VR

SCR EEN VR

FBT

2. Select OSD with FUNCTION ( / ) key

3. Adjust the OSD horizontal position with the FUNCTION ( / )

key, wh ic h shifts th e ref er enc e bar on the b ott om of th e
SE RV ICE MENU ho r izo ntall y, s o th at the OSD is po sition ed on

th e scr een c ent er . ( X=X’)

■■■■

IF ADJUSTMENT

Item

IF adjustme nt R emot e

Measuring

instrume nt

control unit

Reference bar

XX’

Test point Ad justment part Description

IF 1

IF 2

IF 3

IF 4

1. Receive a PAL colour bar pattern.

2. En ter SE R VICE MENU .

3. Select I F 1 with FUNCTION ( / ) ke y

4. Pr ess BLUE k ey d ur i ng I F 1 is h ig hl i gh ted , I F 1 and IF 2 values
are ad ju s ted autom atic ally by sof twar e.

5. If the st and ar d i s L- p ri m e, IF 3 and I F 4 valu es are ad ju stm ent
au tom at ic al l y when B LU E key is press ed dur i n g I F 1 i s

highlight ed.

14

No. 52056