JVC AV-21RM4SE User manual

SERVICE MANUAL
COPYRIGHT © 2005 Victor Company of Japan, Limited No.YA080B
2005/3
COLOUR TELEVISION
YA080B20053AV-20RM4SE, AV-21RM4SE,
AV-21RM4SN, AV-21RM4SP
DIFFERENCE LIST
PRINTED WIRING BOARD PARTS LIST
MAIN P.W. BOARD ASS'Y
Supplementary
The following items for the AV-20RM4SE, AV-21RM4SE, AV-21RM4SN and AV-21RM4SP were changed
partly.
Therefore, this service manual describes only the items which differ from those of the AV-20RM4SE, AV-
21RM4SE, AV-21RM4SN and AV-21RM4SP service manual.
For details other than those described in this manual, please refer to the AV-20RM4SE, AV-21RM4SE, AV-
21RM4SN and AV-21RM4SP service manual (No.52056, 2005/2).
Ref. No. Part No. PART NAME DESCRIPTION
BEFORE AFTER
TU201 VE-30009637 VE-30033888 TUNER Non compatible

1-2 (No.YA080B)
SECTION 1
PRECAUTION
Please refer to "AV-20RM4SE, AV-21RM4SE, AV-21RM4SN and AV-21RM4SP (No.YA080)" about this section.
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Please refer to "AV-20RM4SE, AV-21RM4SE, AV-21RM4SN and AV-21RM4SP (No.YA080)" about this section.
SECTION 3
DISASSEMBLY
Please refer to "AV-20RM4SE, AV-21RM4SE, AV-21RM4SN and AV-21RM4SP (No.YA080)" about this section.
SECTION 4
ADJUSTMENT
4.1 SETTING VALUES OF OPTION ITEMS
When a previous TUNER (VE-30009637) is replaced by a new TUNER (VE-30033888), it should be adjusted to the setting values in
the table below. If the TUNER of the model with the new TUNER (VE-30033888) is replaced, there is no need for adjustment.
4.1.1 SETTING VALUE OF SETTING ITEM
Make sure not to change the values that are not in the table below. If those values are changed, the unit will not operate normally.
Item
Setting value
BEFORE AFTER
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
F1H 0000100100001011
F1L 1001001001010010
F2H 0001101100011101
F2L 1000001000000010
BS1 0000001100000001
BS2 0000011000000010
BS3 1000010100001000
CB 1000111010001110

(No.YA080B)1-3
4.1.2 HOW TO ENTER THE SERVICE MODE
(1) Press the [INFORMATION] key and [MUTING] key
simultaneously, and the SERVICE MENU screen will be
displayed. (Fig.1)
Fig.1
4.1.3 HOW TO SELECT THE SETTING ITEM
While the SERVICE MENU screen is displayed, press the []/[]
key and select the setting item.(Fig.2)
Fig.2
4.1.4 HOW TO CHANGE THE SETTING VLUE
(1) After selecting the correct 8-bit option line, by using the
dedicated number on the number key (0,1,2,3,4,5,6,7) you
can change that bit from 0 to 1 or vice versa.
Example:
Initially an option with values: "00000000"
Press "0" button: "00000001"
Press "0" button again: "00000000"
4.1.5 HOW TO STORE OF SETTING VALUE
(1) The setting value will be stored auto matically when
release the REMOTE CONTROL UNIT keys.
SECTION 5
TROUBLESHOOTING
Please refer to "AV-20RM4SE, AV-21RM4SE, AV-21RM4SN and AV-21RM4SP (No.YA080)" about this section.
JVCAK30/37 B23
OSD 080
IF1 004
IF2 069
IF3 004
IF4 031
AGC 042
VLIN 031
RGBH 007
VSOF -20
VPOF -05
> 0 3 AVL *
SERVICE MENU
JVCAK30/37 B23
NIP 018
SCP2 018
SEC2 017
F1H 00001101
F1L 00010010
F2H 00010010
F2L 00010010
BS1 00010010
BS2 00010010
BS3 00010010
> 0 3 76543210
00000000
Bit 7
Bit 6 Bit 4 Bit 2 Bit 0
Bit 5 Bit 3 Bit 1
MUTING key
REMOTE CONTROL UNIT key NAME
INFORMATION key
FUNCTION
[ ]/[ ] key
MENU key
FUNCTION
[ ]/[ ] key

(No.YA080B)
AV & MULTIMEDIA COMPANY VIDEO DISPLAY CATEGORY 12, 3-chome, Moriya-cho, kanagawa-ku, Yokohama, kanagawa-prefecture, 221-8528, Japan
Victor Company of Japan, Limited
VPT
Printed in Japan

No. 52056
AV- 25BT6ENS
AV- 25BT6EN
B
1CO PYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
Jul. 2002
AV25BT6ENS
AV25BT6ENB
CONTENTS
!SPECIFICATIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････････････････････
･･････････････････････････････････････････････････････････
･････････････････････････････ 2
!SAFETY PRECAUT IONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････････････････････････
･･････････････････････････････････････････････
･･･････････････････････ 4
!FEATURES････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････
･･････
･･･ 5
!MAIN DIFFERENCE LIST ････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････････････････････････
･･････････････････････････････････････････････
･･･････････････････････ 5
!SPECIFIC SERVICE INSTRUCTIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････
･･････････････････････････
･････････････ 6
!SERVICE ADJUSTMENTS ････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････････････
･･････････････････････････････････････････
･････････････････････ 10
!PARTS LIST ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････
･･
･21
★
OPERATING INSTRUCTIONS
★
ST ANDARD CIRCUIT DIAGRAM ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････
････････････････････････････････
････････････････2- 1
SERVICE MANUAL
COLOUR TELEVISION

No.52056
A
V-25BT6ENS
A
V-25BT6ENB
2
SPECIFICATIONS
Content
ITEM AV -25BT 6EN S ( S ilve r)
AV -2 5BT 6EN B ( Bla ck )
Dimensions ( WxHxD) 69 cm x 54 cm x 47 cm
Weight 27 kg
TV RF System B/G
TV Mode PA L
Colour Sy st em Video Mode PA L / NTSC 3 .58 / NTSC 4.43
Teletext System Fast ext / Toptext
St ere o Sy st em German + NICAM
Tuning System Frequ enc y Synt hes iz er Tun in g S ystem
Nu mb er Of CH me mory position 10 0 ch
VHF (VL) 46 .25 MHZ ~ 1 68. 25 MHz
VHF (VH) 17 5.2 5M Hz ~ 46 3.2 5M Hz
UHF 47 1.2 5M Hz ~ 86 3.2 5M Hz
Receiving Frequency
CATV S01- S 4 1 & S7 5- S79
VIF Carrier 38 .9 MHz
32.4MHz (6.5MHz)
32.9MHz (6.0MHz)
Intermediate Fr equency SIF Carrier
33.4MHz (5.5MHz)
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 ~ 24 0V, 50Hz
Power Consumption 135W(Max.) 1.8W (stand by)
Picture Tube Vi si ble size : 59cm ( M easu r ed d iago na lly)
Hi gh Volt ag e 30 .45kV
Spe ake r 5.7 X 16 cm Oval type X 2
Au dio Output 10W + 10W
Video 1V p- p, 75 Ohm
S/V ideo Y: 1Vp - p P osi tive
C: 0. 28 6Vp -p
Input
Au dio
(
L/R
)
50 0 mV rms, H igh I mp eda nce
Video 1 Vp-p, 75 O hm
Output Au dio
(
L/R
)
50 0 mV rms, L ow Imp ed anc e
AV 1 ( Vi d eo/A ud i o/RGB)
Rear Side AV 2 (Vid eo/A udio/S-VHS)Input Terminal
Front Side AV 3 ( Vi d eo/A ud i o)
Front Side Hea dph on e jac k (S ter e o m ini jack 3.5∅)
AV1 (V ideo /Au dio)Output Ter minal
Rear Side AV2 ( V i deo /Au di o) ( S electe d TV, AV 1 o r AV3 )
Remote Control Unit VE -3 00 177 63 (RM- C11 00) , Ba tte r y size :AA /R 06 dry b att er y x 2
Design & sp eci fications ar e subje ct to cha nge wi thou t notice.

No.52056
A
V-25BT6ENS
A
V-25BT6ENB
3
■
■■
■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
No . Signal Designation Matching Value AV-1 AV-2
1 AU DIO R o ut put 50 0m Vrms( Nom ina l),L ow im pe dan ce ○
(TV OUT)
○
(TV/LINE OUT)
2 AUDIO R input 500mVrms(Nominal),High impedance ○○
3 AU DIO L o utp ut 50 0m Vrms( Nom ina l),L ow im pe dan ce ○
(TV OUT)
○
(TV/LINE OUT)
4 AUDIO G ND ○○
5 GND (B) ○○
6 AUDIO L input 500mVrms(Nominal), High impedance ○○
7Binput 70 0mVB-W, 75Ω○ NC
8FUNCTON SW
(SLOW SW) Low : 0-3V, High : 8-12V, High impedance ○NC
9 GND (G) ○○
10 - NC -
11 G i n put 70 0m VB-W, 7 5Ω○ NC
12 -NC -
13 GND (R) ○○
14 GND (YS) ○NC
15 R / C input R : 700mVB-W, 75Ω
C : 300mVP-P , 75Ω
○
(R/C)
○
(only C)
16 Ys in put L ow : 0 – 0. 4, H ig h : 1 - 3 V, 75 Ω○NC
17 GND(VIDEO output) ○○
18 GND(VIDEO input) ○○
19 VIDEO ou tpu t 1V S-W (Negative going sync), 75Ω○
(TV)
○
(TV/LINE OUT)
20 VIDEO / Y input 1VS-W (Negative going sync), 75Ω○○
21 COMMON G ND ○○
[Pin assignment]

No.52056
A
V-25BT6ENS
A
V-25BT6ENB
4
SAFETY PRECAUTIONS
1. T he d esi gn of th is pr od uct con ta in s sp eci al hard wa re , ma ny
circuits and components specially for saf ety purposes. For
con ti nu ed prot ection , n o chan g es sh ou ld b e ma de to the o rig inal
d esi gn un l ess a uth or ized in writi n g by th e ma nu fact urer .
Rep lacem en t p ar ts m ust b e id ent ic al to thos e u sed in th e or igin al
ci rcu it s. Se r vic e sh ou ld be pe rf or me d b y q ua lifi e d per so nn el
on ly.
2. Alte r ation s of t he desig n or cir cuitr y of t he pr od ucts sh oul d not be
made. Any design alterations or additions will void the
m anu fact ur er's w arra nt y and will f ur th er relieve t he ma nu factu r er
of r esp onsi b il ity for per so na l injury or p r op erty d am ag e resul t in g
th er efr om .
3. M an y e lectr ical an d m ech ani ca l p ar ts in th e pr od ucts ha ve
special safety-related characteristics. T hese characteristics are
oft en no t e vi den t f r om vi sua l insp ecti on n or ca n t he pro tect io n
aff or de d by th em nece ssar ily b e ob tain ed b y u sin g r ep lacem en t
com po ne nts ra ted f or hig he r vo ltag e, watt ag e, etc. Rep lacem en t
p arts wh ic h ha ve th ese sp eci al s afet y ch ar act er ist ics are
identified in the parts list of Servic e manual. El ec tric al
components having su ch features ar e identified by shading
on the sche matic s and by (!
!!
!) on the parts list in Service
manual. The us e of a sub sti tu te rep la cem en t which do es n ot
h ave th e sam e saf ety ch ar act er ist ics as t he r eco mm en de d
r eplac em ent part sh ow n in th e p ar ts l ist of S er vi ce m an ual m ay
cause shock, fire, or other hazards.
4. Do n't short between the LIVE side ground and ISOL ATED
(NEUTRAL) side ground or EARTH side ground when
repairing.
Some model's power circuit is partly different in the GND. The
diff er enc e of the GND i s sh own b y th e LI VE side G ND, th e
ISO LATE D( NEUTRAL) side GND a nd EA RTH side GN D. Don' t
sh ort b etwee n the L IVE si de GND a nd IS OLATE D(NEU TR AL)
side GND or EA RTH side GND and ne ver meas ure with a
m easu r in g app ar atu s ( osc illosc ope et c.) th e LIV E sid e GN D an d
ISOLATED(NEUTRAL) side GND or EARTH side GND at the
same time.
If above note will not be kept, a fuse or any parts will be broken.
5. If any repair has been made to the chassis, it is recommended
th at t he B1 set ting shou l d b e ch ecke d or adju ste d ( Se e
ADJU STM ENT OF B 1 POW E R SU PPLY).
6. T he hi gh vol ta ge app lie d t o th e pi ctu r e tu be mu st con for m wit h
th at sp ecifi ed in S ervice man ual. E xcessi ve h igh vo lt ag e ca n
cau se an incr e ase i n X- Ray em ission , ar ci ng an d possib le
component damage, therefore operation under excessive high
voltage conditions should be kept to a minimum, or should be
prevent ed. If s evere arc in g occurs, rem ove t he AC power
immed iate l y an d de ter mine th e ca use b y vi sua l i nsp ect io n
( in corr ect in stal lat i on, cr acke d or m elte d high vo lt age harn ess,
p oor so ld er ing, et c.) . To m aint ai n the p r ope r min imu m l e vel of
sof t X- Ray em ission, c omp on en ts i n th e high vol tag e ci rcui tr y
incl ud ing t he pict ur e tu be must b e t he e xact r ep lacem e nts or
alte rn at i ves ap pr ove d b y th e ma nuf act ur er of th e c omplet e
pr od uct.
7. Do n ot c hec k high volt ag e b y drawing an ar c. Use a high volt ag e
m eter or a hi g h v ol tag e prob e wit h a V T VM. D ischa rg e th e
picture tube before attempting meter connection, by connecting
a clip le ad to th e gr ou nd f ra me a nd c onn ecti n g th e oth er end of
the lead through a 10kΩ2W resisto r to the an od e b utt on .
8. W hen se r vice i s r equ ire d, ob ser ve th e or igina l lea d dr ess. E xtr a
pr ec aut i on sh ou ld b e g i ve n t o assur e cor rect l ea d dr ess i n th e
hig h voltag e cir cui t a r ea. W her e a s hor t circui t h as occu rr e d,
th ose co mp on ent s tha t i ndica te evide nce of ove rhea ting sho uld
b e r e place d. A lwa ys u se th e ma nuf act ur er's rep lacem en t
components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
Af ter re- ass emb lin g th e p r odu ct, always per f orm an isol at io n
ch eck on the expo sed me tal p ar ts of t he cabin et ( a nte nn a
ter m ina ls, vid eo /au di o inpu t and ou tpu t t ermin als, Con tr ol kn obs,
metal cabinet, screwheads, earphone jack , control shafts, et c.)
to be su re th e p r odu ct is s af e t o o pe r ate with ou t d an ger of
elect rical shoc k.
(1) Dielectric Strength Test
The iso l ati on be tween the A C pr im a ry circu it an d al l me tal p ar ts
exp ose d t o th e us er , p ar ti cul arly an y e xp os ed met al p art h avi ng a
r etu rn p ath to t he chass is sho uld withs tan d a volt age of 3 000 V
AC (r.m.s.) for a period of one second.
( . . . . W it hstan d a vo lt ag e of 1 10 0V A C (r .m. s.) t o an ap plianc e
r ate d up to 12 0V , an d 3 00 0V AC ( r.m. s.) to an ap pli an ce r at ed
200V or more, for a period of one second.)
This method of test requires a test equipment not generally found
in t he ser vic e tr ad e.
(2) Leakage Current Check
Pl ug th e A C lin e c ord d irect l y in to th e A C ou tlet ( d o n ot use a lin e
isol atio n tr ansf or mer du r in g thi s ch eck.) . Usi n g a " Lea kag e
Cur rent Teste r", me asur e th e lea kag e cu rre nt f rom each exp osed
m etal p ar t of the ca bine t, p art icu l arly any e xpos ed me tal p ar t
h aving a re turn pa th to t he ch assis , t o a kn own go od ea rt h
gr ou nd (wa ter pi p e, e tc.) . An y l eaka ge cur ren t m ust n ot e xceed
0.5mA AC (r.m.s.).
Howeve r, i n tr op ic al ar ea , th is mu st no t exce ed 0.2 mA AC
(r.m.s.).
"
""
"Alte rnat e Che ck M ethod
Pl ug th e A C lin e c ord d irect l y in to th e A C ou tlet ( d o n ot use a lin e
isol atio n tr an sfor mer during t hi s che ck.) . Use an AC vo lt me ter
h avi ng 1 00 0 oh ms pe r volt or m ore sens it ivi ty in th e fo llowing
m ann er. C on nec t a 1 50 0Ω10W res ist or par a ll e le d b y a 0 .1 5µF
AC -type c apa cit or bet we en an expo sed met al pa rt a nd a kno wn
g ood e arth gr o un d ( wa ter pipe , etc.) . M eas ur e th e A C vo lt ag e
acr oss th e res ist or w ith th e AC vo l tm eter . M ove th e r esistor
con nec ti on to e ach exp ose d me tal par t, p art i cular ly a ny exp osed
m etal p ar t havin g a r etu rn pat h to t he ch assi s, an d m easu r e th e
AC voltag e ac ro ss the r es ist or . No w, re ver se th e pl u g in th e AC
ou tl et and r e pe at eac h mea sur em en t. An y volt ag e me asu re d
mu st not exc eed 0.7 5V AC (r.m.s.). This c orresponds to 0.5mA
AC (r.m.s.).
However, in tropical area, this mu st n ot exceed 0 .3V AC ( r.m.s.).
This corresponds to 0.2mA AC (r.m.s.).
0.15μF AC-T YPE
1500 Ω10W
GOODEARTH GROUND
PLACE THIS PROBE
ON E A CH EX PO SE D
ME T AL PA RT
ACVOLTMETER
(HAVING 1000 Ω/V,
OR MOR E SENSIT IVITY)

No.52056
A
V-25BT6ENS
A
V-25BT6ENB
5
FEATURES
1. It is a remote controlled color television.
2. 10 0 pr og ram s fr om VHF, UHF b an ds or cab le cha nn els can be
pres et.
3. It c an tun e c abl e cha nn el s.
4. C ont ro llin g th e TV is ver y easy by i ts m en u dr ive n s yst em .
5. It h as tw o Eu r ocon n ector s ockets fo r exte r nal de vice (such as
vi de o r eco rd er, vid eo ga mes , a udi o set, e tc.)
6. F ront AV Inp ut avai la ble.
7. St ereo s ou nd s ys tems (Germ an + Nic am) are a vailable.
8. Full fu nction Tele text (Fast ext, Toptext ).
9. It i s possib le to con nec t h ead ph on e.
10. Direct channel acc ess.
11 . AP S ( Aut om at ic P r ogr amming Syste m).
12 . Al l pr og rams ca n b e nam ed .
13 . For war d o r bac kw ard au to ma ti c tu ning .
14 . Au tom at ic sou nd mu te wh en no tr an smission .
15 . 5 minu tes aft er the bro adc asti ng ( cl osed own) , the TV s witch es
itself aut om atica lly t o st and - by m od e.
16. Child Lock.
MAIN DIFFERENCE LIST
!
!!
!MODEL No.
Parts Name
AV -2 5B T 6 ENS
(Silver)
AV -2 5B T 6 ENB
(Bl ack )
!POW E R BUTTO N VE -2 00 435 32 VE -2 00 009 03
!FRON T CA BIN ET VE -2 00 464 46 VE -2 00 041 31
!FUNCT ION B UTTO N VE -2 00 435 45 VE -2 00 037 30
!REAR COVE R VE -2 00 925 23 VE -2 01 015 75
CAR TON BOX VE -5 00 284 94 VE -5 00 285 07
!RATING L ABE L VE -2 01 021 34 VE -2 01 021 64

No.52056
A
V-25BT6ENS
A
V-25BT6ENB
6
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. R emove th e 8screws marked A.
2. R emove th e 2screws marked B.
3. W i thdr a w t he r ear co ver to wa rd you .
REMOVING THE MAIN PWB ASS’Y
"After removing the rear cover .
1. Yo u c an pull o ut t he MAIN PWB ASS’Y.
REMOVING THE HEADPHONE PWB ASS’Y
"After removing the rear cover.
1. R emove th e 1screw marked C.
2. R emove th e HEA DP HO NE PW B AS S’Y & BRACK ET.
REMOVING THE SPEAKER
"After removing the rear cover.
1. R emove th e 4screws marked D.
2. Remove th e SP EAK ER.
REMOVING THE FRONT CONTROL PWB
"After removing the rear cover.
"Remove th e MAIN PW B AS S’Y.
1. Rem ove the 4screws marked E a nd r emove th e FRON T
CONTROL PWB.
REMOVING THE POWER SW
"After removing the rear cover .
"Remove th e MAIN PW B AS S’Y.
"Remove the 2screws marked F, and remove th e POW ER SW.
REAR COVER
BRACKET
S
PEAKER
FR
O
NT
CO
NTR
O
L PWB
MAINPWB
C
E
HEADPHONE
PWB
D
C
RT
FRONT CABINET
POW ER S W
F
A
AV
TERMINAL
BOARD
B

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
7
REPLACEMENT OF CHIP COMPONENT
!CAUTIONS
1. Avoid heating for more than 3 seconds.
2. D o n ot ru b t he elect ro des an d t he r esi st p ar ts of th e p att er n.
3. W hen r em oving a c hi p par t, m elt th e s ol der ad equ ate l y.
4. D o n ot r euse a ch i p p ar t afte r re mo vi ng it .
!SOLDERING IRON
1. Use a hig h ins ulatio n s oldering iron with a t hin po in ted e nd of it .
2. A 3 0 w s olderi ng i ron is r ec om m end ed for easily r em ovi ng p ar ts.
!REPLACEMENT STEPS
1. How to remove Chip parts
#Resi st ors, ca pa cit ors , et c .
( 1) As sho wn i n th e fi gure, p ush th e pa rt wi th tw ee zer s a nd
alte rn at el y m elt th e solde r at each en d.
( 2) Sh if t wi th tweeze rs an d r emo ve th e ch ip p art.
#Tran s ist ors, d iodes , va ria bl e r es ist or s, et c.
( 1) Ap pl y e xt ra so ld er to ea ch le ad .
( 2) As sho wn i n th e fi gure, p ush th e pa rt wi th tw ee zer s a nd
alte rn at el y m elt the sol d er at e ach le ad . Shift and remove
th e ch ip part .
Note : After removing the part, remove remaining solder from
the pattern .
2. How to install Chip parts
#Resi st ors, ca pa cit ors , et c .
(1) Apply solder to the p attern as indic ated in the fig ure.
( 2) Gr asp th e ch i p p art w it h t w eez ers and p lace it on th e
sol d er. Th en h eat and me lt th e so ld er at b oth e nds of the
chip part.
#Tran s ist ors, d iodes , va ria bl e r es ist or s, et c.
(1) Apply solder to the p attern as indic ated in the fig ure.
( 2) Gr asp th e ch i p p art w it h t w eez ers and p lace it on th e
solder.
(3) First s older lead Aas indicated in t he figure .
( 4) The n so ld er l e ads Band C.
SOLD E R SOLD E R
A
B
C
A
B
C

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
8
SERVICE MENU SELECT KEY
MEMORY IC REPLACEMENT
1. Memory IC
This model use a memory IC.
This me mo ry I C st or es d ata for pr op er op er ati o n of the vid eo
an d d ef l ection circu it s.
When replacing, be sure to use an IC containing this (initial
value) data.
2. Memory IC replacemen t procedure
(1) Power off
Sw itch of f t he p ow er an d discon nec t th e po we r co rd fr om
the wall outlet.
(2) Replace the memory IC
Init ial value must be entered into the new IC.
(3) Power on
Con nect th e po w er cord t o t he wa ll o ut le t an d s witch on t he
power.
(4) SERVICE MENU setting
1) Press MENU key and, while the displayed MENU
screen, press 4, 7, 2, 5 key on th e r em ote co ntr ol u ni t or
press MUTING key and INFORMATION key at the
simultaneously.
2) The SERV IC E MEN U scr ee n of Fig.1 i s d isp l ayed .
3) Ve rif y wh at to set in th e SER V IC E MENU, and set
what ever is n ece ssar y ( Fi g.1 ). Ref er to th e SE RV IC E
ADJUSTMENT for settin g.
4) Press the STANDARD key to exit SERVICE MENU.
(5) Receive channel setting
Refer to the OP ERATING I NSTRUCTIO NS (US ER’S
GU ID E) a nd s et th e r ece ive ch an nel s ( Chan n el s P r eset ) as
described.
( 6) U ser se ttings
Check th e us er sett in g it em s acc or ding to aft er pa ge .
W here th ese d o no t a gr ee, r efer to t he OPE RA TIN G
INSTRUCT IONS (USER’S GUIDE) and set the it ems as
described.
Fig.1
SE RV ICE MENU
Fig.2
VALUE
SELECT(－)
VALUE
SELECT(＋)
NUMBER
ITEM
SELECT(▲)
ITEM
SELECT(▼)
MENU
FUNCTION
POWER
MU T I NG
INFORMATION
COLOUR
k
ey
STANDARD

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
9
SETTING OF THE LAST MEMORY FOR SHIPMENT
■
■■
■USER SETTING VALUES
Setting Item Setting Value Setting Item Setting Value
SOUND MENU FEATURE MENU
BA LANCE CENTER SL EEP TIME R OFF
BA SS ↑CHILD LOCK OFF
TREBL E ↑LA NG UA GE ENGL ISH
MODE STEREO AV-2 OUTPUT TV
EFFECT OFF
PICTURE MENU INSTALL
BRIGHTNESS PROGRAMME
CONTRAST BAND
COLOUR CHANNEL
SHARPNES S SE ARCH
HUE (only NTSC)
Thes e ad j ust a re aut om atica lly
restored when AP S b it in Service
menu is set .
The pr oc edu r e f or se tti ng AP S
bit is described bellow. FINE TUNING
PICTURE MODE AUTO STORE
Refer to t he INSTRUCTI ON
BOO K
■
■■
■SETTING APS BIT IN SERVICE MENU
1) En ter ser vice me nu in TV m ode b y pr essing “ INFOR MA TION ” a nd “ MUTI NG” ke ys simu ltan eou sly. S er vic e M en u wi ll ap pea r.
2) Se le ct TX1 (TEL ETEXT OPTIO N) b y pr essi n g Up /D own keys o n r emot 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 c ontrol unit to exit s ervice mode.
NOTE : DO NOT TURN OFF THE TV BY USING POWER BUTTON ON THE FRONT PANEL.

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
10
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You ca n ma ke t he ne ce ssa ry adjust me nts f or t his unit wit h
either the Remote Control Unit or With the adjustment tools
and par ts as given below.
2. Ad justment with the Remote Control Unit is made on the
basis of the initial setting values, however, the new setting
values which set the screen to its optimum condition may
diffe r from the initial settings.
3. M ake sure t hat AC p ower i s tu r ned o n c orrec tly.
4. Turn on th e power for s et an d test eq uip me nt bef or e use , and
sta rt t he ad j ustm en t p r oced ur es aft er waiting at l east 30 m in ut es.
5. Unless o the r wise s pec if i ed, prep ar e t he mo st su it ab le r ecep tion
or inp ut sign al for adj ust m ent.
6. Never tou ch any ad j ustm en t p ar ts wh ic h ar e n ot sp ecified i n t he
list for this adjustment - variable resistors, transformers,
condensers, etc.
7. Pr es etting b efor e ad justm en t.
Unless ot her wise spec if ied i n t he a djustm e nt instr uct ions, p r ese t
th e f ol lo w in g f un cti ons w ith th e r e mo te c ont ro l un it :
BRIGHTNES S
CONTRAST
COLOUR
SHARPNES S
CENTER
ADJUSTMENT EQUIPMENT
1. DC voltmeter (or digital voltmeter)
2. Si gn al g en er at or (P att er n g en er at or) ［PAL/SECAM/NTSC］
3. Remote control unit
ADJUSTMENT ITEM
!SCREEN A DJUST MENT
!OSD HORIZONTAL PO SITION ADJ USTMENT
!IF ADJUSTMENT
!AGC A UTO MATI CA LL Y A DJUSTM ENT
!DEFLECTIO N CIRCUIT ADJUSTMENT
!GEO MET RY ME NU AD JUS TME NT
!WHITE BALANCE ADJUSTMENT
VOL
（＋）
（＋）（＋）
（＋） （－）
（－）（－）
（－）
PROG
/Ch.
（＋）
（＋）（＋）
（＋） （－）
（－）（－）
（－）
ME NU
LE D REMOCON
RECEIVER
IC501
MI CO M
IC502
ME MO R Y IC
TUNER AV -1 AV -2
FBT
UPPER : FOCUS VR
LOWE R : SCREEN VR
VIDEO R L
FRONT
TOP
AUDIO.
SCART
jack SCART jack
MAIN PARTS LOCATIONS

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
11
BASIC OPERATION SERVICE MENU
■
■■
■HOW TO ENTER THE SERVICE MENU
1) Press the MENU key.
2) ME NU sc re en of fi g.1 w ill b e d ispl a ye d
3) W hile the ME NU scr ee n is di sp layed , p r ess th e 4,7 ,2, 5 ke y or
INFORMA TION key and MUT ING key s imultaneously.
4) The SERVICE MENU screen of (Fig.2) will be displayed.
■SEL ECTION OF ADJUSTMENT ITEMS
1) Enter th e SER VICE ME NU
2) Press the FUNCTION / key and select the ADJUSTMENT
ITEM.
3) Press the FUNCTION / ke y an d s et t he SETTI NG VALUE.
■HOW TO EXIT SERVICE MODE
1) Press the ST ANDARD Key on REMOTE CONTROL UNIT.
■HOW TO ENTER THE GEOMETRY MENU
"This m o del is bu ilt- in GEO ME TR Y MEN U f or ge om et ry
adjustment.
1) Enter th e SER VICE ME NU
2) Press the GREEN key, geometry menu appears (Fig. 3).
3) Press the FUNCTION / key and select the ADJUSTMENT
ITEM.
4) Press the FUNCTION / ke y an d s et t he SETTI NG VALUE.
MENU SC RE EN
Fi
g
.1
"FUNCTION OF COL OUR key
RED key :
It sw itch es th e AV L t o ON o r OFF mo de on ser vic e
m enu . AV L wo rd is visible o n s er vi ce m en u wh en
AV L is o n.
GR EE N k ey :
It s witch es t o GE OMETRY a djust menu . G eom et r y
of th e p ict ur e i s a djust ed in th is m enu .
YELLOW key :
It s witch es t o VE RT ICAL S CAN DISABLE mode.
It i s us eful t o a dj ust scr een volt age .
BL UE ke y :
It is used to a djust AGC an d I F au to m ati cally on
ser vi ce me nu.
REMOTE CONTROL UNIT key NAME
NUMBER key
FUNCTION
key
AV key MENU key
COLOUR key
STANDARD
key
MENU
SOUND
PICTURE
FEATURE
INSTALL
PROGRAM
SE RV ICE MENU
Fi
g
.2
ADJUSTMENT ITEM SETTING VALUE
Fi
g
.3
VSIZ 023
VPOS 028
VSCO 000
VCCO 008
HSIZ 007
HPOS 039
HPIN 015
GEOME TRY
GEOME TRY MEN U
ADJUSTMENT ITEM SETTING VALUE
INFORMA TION
key

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
12
■ADJUSTMENT ITEM & INITIAL (Recommended) SETTING VALUE in the SERVICE MENU
ADJUSTMENT
ITEM DESCRIPTION INITIAL VALUE
OSD HORIZONTAL POSI TION OF OSD 082
IF1 IF COARS E ADJUSTMENT 00 4
IF2 IF FINE ADJUSTMENT 065
IF3 IF COARS E ADJUSTMENT FOR L-P RI ME 00 4
IF4 IF FINE A DJUS TME NT FO R L-PRIME 065
AGC AUTOMATIC GA IN CO NT RO L Automat ic ally
VLIN VERTICA L LINE ARITY Not used
RGBH RGB MODE HORIZONTAL SHIFT OFFSET 007
VSOF VERTICA L SIZE OFFSET for 60Hz -01
VP OF VE RTIC A L PO SITIO N OFFSET f or 60Hz -01
HSOF HORIZONTAL SIZE OFFSET for 60Hz +00
HPOF HORIZONTAL P OSI TION OFFSE T for 6 0Hz +00
HTOF HORIZONTAL TRAPEZOID OFFSET for 60Hz +01
W R W HITE PO INT ADJU STME NT FO R RE D 04 0
WG WHITE PO INT ADJUSTME NT FO R GREEN 04 0
WB WHITE PO INT ADJUSTME NT FO R BLUE 040
BR BIA S FOR RED 03 0
BG BIA S FOR G RE EN 03 1
APR AUTOMATIC RGB P EAK REGULATION THRESHOLD 010
BRI BRIGHTNES S 03 0
CON CONTRAST 035
COL COLOUR 038
SHR SHARP 006
HUE HUE 031
VOL VOL UME 015
WR-R WHITE PO INT ADJUSTMENT for RED (RGBmo de) 030
W G-R W HITE PO INT ADJUSTME NT for GR EE N (RGBmo de) 05 5
WB-R W HITE PO INT ADJUSTMENT for BL UE (RGBmode) 032
FMP 1 FM PRES CA LER W HE N AV L IS OFF Not used
NIP1 NIC AM PRES CALE R W HE N AV L IS OFF Not used
SCP1 SCART PRES CA LER W HE N AV L IS OFF Not used
SE C1 SE CA M PRE SCALE R W HE N AV L IS OFF Not used
FMP 2 FM PRES CA LER W HE N AV L IS ON 01 3
NIP2 NICAM PRESCALER WHEN AVL IS ON 016
SCP2 SCART PRES CA LER W HE N AV L IS ON 01 3
SE C2 SE CA M PRE SCALE R W HE N AV L IS ON Not used
F1H HIGH BYTE OF VHF1-VHF3 CROSS-OVER FREQUENCY 00001001
F1L LOW BYTE O F VHF1-VHF3 CROSS -O VER FREQ UE NCY 1001 0010
F2H HIGH BYTE OF VHF3-UHF CROSS-OVER FREQUENCY 00011011
F2L LOW BYTE O F VHF3- UHF CROS S-OVER FREQ UE NCY 10 00 00 10
BS 1 BA ND SW ITCHING B YTE FOR V HF1 00 0000 11
BS 2 BA ND SW ITCHING B YTE FOR V HF3 00 0001 10
BS 3 BA ND SW ITCHIN G B YTE FOR UHF 10 00 01 01
CB CON TR OL B YTE 10 00 11 10
OP1 PERIPHERAL OPTIONS 01110101
1/2

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
13
■ADJUSTMENT ITEM & INITIAL (Recommended) SETTING VALUE in the SERVICE MENU
"[GEOMETRY MENU]
ADJUSTMENT
ITEM
DE SC RIPTI ON INITIAL VALUE
OP2 RECEPTI ON STANDARD OPTIO NS 00 0010 01
OP3 VIDEO OPTI ONS 01101101
OP4 TV FE AT URE S 10 00 10 00
OP5 CHA N NE L T A BLES 00 00 00 00
TX1 TEL ETEXT O PTIONS 1001 0101
GEO M GEO MET RY OPTIO NS 00000000
OP8 PIP PR ES ET C HANGE 00 00 00 00
ADJUSTMENT
ITEM
DESCRIPTION INITIAL VALUE
VS IZ VE RTICA L S IZE f or 50Hz 030
VP OS VE RTICA L PO SITIO N for 5 0Hz 01 0
CSCO VERTICAL S-CORRECTION for 50Hz Not used
VCCO VERTICAL CORNER CORRECTION for 50Hz Not used
HSIZ HORIZONTAL SIZE for 50Hz Not used
HPOS HORIZONTAL POSI TION for 50Hz 035
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 f or 50Hz Not used
2/2

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
14
ADJUSTMENTS
■
■■
■SC REEN ADJUSTMENT
Item Measuring
instrument Test point Ad justment part Description
SCREEN
adjust me nt
Remote
control unit
SCREEN VR
[On the FBT]
1. En ter SE RVICE MENU .
2. Pr ess YEL LOW ke y to disab l e ve rt ic al s can .
3. Ad ju st SC REE N VR. on th e FBT a s th in as po ssib le.
4. Pr ess YEL LOW k ey ag ai n to en abl e ver tical sc an.
5. Press STANDARD key t o le ave s ervic e men u.
■
■■
■OSD HORIZONTAL POSITION ADJUSTMENT
Item Measuring
instrument Test point Ad justment part Description
HORIZONTAL
POS ITION O F
OSD
adjust me nt
Remote
control unit
OSD 1. En ter SE RVICE MENU.
2. Select OSD with FUNCTION ( / ) ke y
3. Adjust the OSD horizontal position with the FUNCTION ( / )
key, wh ic h shifts th e r ef er ence b ar o n the b ott om of th e
SE RV ICE M ENU ho r izo nta lly, s o th at th e OSD is po siti on ed on
th e scr e en c ent er . ( X=X’)
■
■■
■IF ADJUSTMENT
Item Measuring
instrument Test point Ad justment part Description
IF adjustment Remote
control unit
IF 1
IF 2
IF 3
IF 4
1. Receive a PAL colour bar pattern.
2. En ter SE RVICE MENU .
3. Select I F 1 with FUNCTION ( / ) key
4. Pr ess BLU E key d ur ing I F 1 i s h ig hligh ted , I F 1 an d IF 2 va l ues
ar e ad ju sted au tom at ic al ly b y sof twar e.
5. If th e st and ar d i s L- p rim e, IF 3 and I F 4 valu es ar e ad ju stm ent
au tom at ic ally when B LUE key is press ed durin g I F 1 is
hig hlig ht ed.
FBT
FOCUS VR
SCREEN VR
R
e
f
e
r
e
n
ce
ba
r
Sc
r
ee
n
s
iz
e
SE RV ICE MENU SCREEN
XX’

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
15
■
■■
■AGC AUTOMATICALLY ADJUST MENT
Item Measuring
instrument Test point Ad justment part Description
AG C
AUTOMATIC-
AL LY
adjust me nt
& check
Remote
control unit
AG C 1. En ter SE RVICE MENU .
2. Receive a 60dBμV R F sign al l eve l.
3. Se lect AGC with the FUNCTI ON ( / ) key.
4. Pr ess BLU E ke y on th e r em ot e co ntr ol uni t.
5. Then the adjustment will be done automatically by software.
6. Se e th e AGC i ndica tor o n S ERVIC E MENU, it m ust b e “ 1”.
7. C heck th at p ict ur e i s nor mal a t 90 dB μV signal level.
■
■■
■DEFLECTION CIR CUIT ADJUSTMENT
Item Measuring
instrument Test point Ad justment part Description
R GB M ODE
HORIZONTAL
SHIFT
OFFSET
adjus tme nt
Signal
gener ator
Remote
control unit
RGBH 1. Input R/G/B circle pattern signal via video input terminal.
2. Press AV key on the remote control u nit, force t he TV t o RGB
mode.
3. En ter SE RVICE MENU .
4. Select RGBH with the FUNCTION ( / ) key.
5. Adjust RGBH wit h the FUNCTION ( / ) key u ntil the circle
p atter n is h or izo nt al ly ce nte r ed.( A=B)
6. C heck an d read ju st R GBH item if th e adjus tme nt b eco mes
imp rope r aft er som e oth er g eom et ric a dj ust m ents ar e d on e.
VERTICAL
SIZ E OFFSET
adjus tme nt
(60Hz)
Signal
gener ator
Remote
control unit
VS OF 1. R eceive a N TSC -M cr oss-hat ch pa tte r n of ve rt ic al fr equ en cy
60Hz.
2. En ter SE RVICE MENU .
3. Select VS OF with the FUNCTIO N ( / ) key.
4. Adjust VSOF with the FUNCTION ( / ) key until the
h orizo nt al blac k lines o n b ot h t he u pp er a nd low er p ar t of th e
p atter n bec ome ver y clos e to t he u pp er a nd l owe r hor izon tal
si des of pi ctu re size a nd ne ar ly ab ou t to di sa pp ear .
5. Check and readjust VSOF item if the adjustment becomes
imp rope r aft er som e oth er g eom et ric a dj ust m ents ar e d on e.
:11
IF INDICATOR AGC INDICATOR NONE
SE RV ICE MENU SCREEN
AB
Picture
size
10 0%
Scre en
size
Very clos e
Very clos e

No. 52056
A
V-25BT6ENS
A
V-25BT6ENB
16
Item Measurin
g
instruments Test
p
oint Ad justment part Description
VERTICAL
POSITION
OFFSET
Ad ju st men t
(60Hz)
Signal
gener ator
Remote
control unit
VPOF 1. Recei ve a N TSC -M circ l e p att er n of ve rti ca l fr equ en cy 6 0H z.
2. En ter SE RVICE MENU .
3. Select VP OF with the FUNCTIO N ( / ) key.
4. Adjust VPOF with t he FUNCTION ( / ) key until t he
pictu re is ver tical ly ce nte r ed. (C=D)
5. C heck an d read ju st verti cal positio n it em i f t he a djust me nt
b ecom es i mpr op er aft er some oth er ge om etr ic ad justm en ts
ar e do ne.
HORIZONTAL
POSITION
OFFSET
adjus tme nt
(60Hz)
Signal
generator
Remote
control unit
HPOF 1. R eceive a N TSC -M ci rc le pat ter n si gn al of ver tical fr eq uen cy
60Hz.
2. En ter SE RVICE MENU .
3. Select HPOF with the FUNCTION ( / ) key.
4. Adjust HPOF with the FUNCTION ( / ) key until the circle
p atter n is h or izo nt al ly ce nte r ed.( E=F)
5. C heck an d r ea djust a h orizo nt al po sit i on i t em i f t he adj u stme nt
b ecom es imp r ope r a fte r so me oth er ge ometr ic adj u stm en ts
ar e do ne.
HORIZONTAL
TRAPEZOI D
OFFSET
adjus tme nt
(60Hz)
Signal
generator
Remote
control unit
HT OF 1. Recei ve a N TSC-M cr oss-h atch pa tter n sign al of ve rtic al
fr eq ue ncy 6 0H z.
2. En ter SE RVICE MENU .
3. Select HTOF with the FUNCTION ( / ) key.
4. Ad just HTOF with t he FUNCTIO N ( / ) key u ntil both
len gth s of th e up per sid e an d lo wer sid e of the cl oss- h atch
p atter n b ecom e equ al .
5. Check a nd re adjus t HTOF it em if the adjus tm ent bec omes
imp rope r aft er som e oth er g eom et ric a dj ust m ents ar e d on e.
C
D
EF
Screen
Vertical
Center
Pallalel