No. 52025
Jun. 2002
AV-20N3
AV-20NMG
3
AV-20NMG3
B
1
COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.
AV-20N3/AV-20N3
/D
AV-20NMG3/AV-20NMG3B
/AV-20NMG3
/-A
CONTENTS
!
SPECIFICATIONS
････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････････････････････
･･････････････････････････････････････････････････････････
･････････････････････････････
2
!
SAFETY PRECAUT IONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････････････････････････
･･････････････････････････････････････････････
･･･････････････････････ 3
!
FEATURES････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････
･･････
･･･ 4
!
FUNCTIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･･････････････････････････････････
････
･･ 5
!
MAIN DIFFERENCE LIST ････････････････････････････････
････････････････････････････････････････････････････････････････
･･･････････････････････････････････････････････････････
･･････････････････････････････････････････････
･･･････････････････････ 7
! SPECIFIC SERVICE INSTRUCTIONS ････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････
･･････････････････････････
･････････････ 8
!
SERVICE ADJUSTMENTS
････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････････････････････････
･･････････････････････････････････････････
･････････････････････
15
!
PARTS LIST ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････････････････････
･････････････････････････････････
･･
･ 33
★ OPERATING INSTRUCTIONS
★ STANDARD CIRCUIT DIAGRAM ････････････････････････････････
････････････････････････････････････････････････････････････････
････････････････････････････････････････････････
････････････････････････････････
････････････････ 2-1
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
CG
[
RM-C36 4G Y ]
[ RM-C364 ]
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
2
SPECIFICATIONS
CONT ENTS
ITEM
AV - 20 N3
AV - 20 N3
/D
AV-20NMG3
AV-20NMG3B
AV-20NMG3
/-A
Dimen sio ns(W
×
H
×
D) 619mm
×
458mm
×
488mm
Mass
19kg
TV RF Syst em B/ G, I, D/ K B/ G, I, D/ K, M
RF Mode PAL / SECAM PAL / SECAM / NTSC3.58 / NTSC4 .43
Colour System
VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4 .43
Pi ctur e Tube
Visible size: 48cm measured diagonally
High Voltage 26.5kV
±
1.5kV(at zero beam current)
Receiving Frequency
VHF (VL) 46.25MHz
～
168.25MHz
VHF (VH) 175.25MHz
～
463.25MHz
UHF 471.25MHz
～
863.25MHz
CATV
Cable TVs of Mid ( X-Z, S1-S10)
Super (S11-S20) & Hyper (S21-S41)
bands recei vable
VIF Carrier 38.0MHz
Intermediate
Frequen cy
SIF Carrier
32.5MHz (5.5MHz)
31.5MHz (6.5MHz)
32.0MHz
(6.0MHz)
32.5MHz(5.5MHz) /33.5MHz (4.5MHz)
31.5MHz (6.5MHz)
32.0MHz
(6.0MHz)
Colou r Sub C arrier Freq uen cy
PAL (4.43MHz),
SECAM (4.40625MHz / 4.25MHz)
NTSC (3.58MHz / 4.43MHz)
Power Input Rated Voltage
AC110
～
240V, 50 / 60Hz
Power Co nsu mption
90W (Max) / 60W(Avg)
Speaker
5cm
×
12 cm, O val type
×
2
Audio Output
3W (monaural )
Aer ial In put Terminal
75
Ω
Unbalanced
Input
Video 1V(p-p), 75
Ω
(Front / Rear )
Audio
500mV(rms) (-4dBs), High impedance,
RCA
×
2 (Front / Rear)
Output
Video 1V(p-p), 75
Ω
Audio 500mV( rms) (-4dBs), Low impedance,
Headphone jack
3.5mm mini jack
Remote Control Unit
RM-C364GY
(Battery s ize : AA / R06 / UM-3
×
2)
[AV-20NMG3 / AV-20NMG3
/-A]
: RM-C364G Y
[AV-20NMG3B]
: RM-C364
(Battery s ize : AA / R06 / UM-3
×
2)
Design and specifications are subject to change without notice.
No.52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
3
SAFETY PRECAUTIONS
1. The d esign of th is pr od uct con tains sp ecial hard ware, ma ny
circuit s and components specially for safety purposes. For
con tinu ed prot ection , no chan g es sh ou ld b e ma de to the o rig inal
d esign unless a uth or ized in writin g by the ma nu fact ur er .
Replacem en t p ar ts m ust b e id ent ic al to thos e u sed in th e origin al
circu it s. S ervice sho uld b e p erformed by qu alif ied p ers onnel
on ly.
2. Alte ration s of t he design or cir cuitry of t he pr od ucts sh ould not be
made. Any design alterations or additions will void the
manu fact urer's warra nt y and will f urth er relieve t he manu factu rer
of r esp onsibility for per so na l injury or p rop erty d amag e result ing
th er efrom.
3. M an y e lectr ical an d m echanica l parts in th e pr od ucts have
special safety-related characteristics. T hese characteristics are
oft en no t e viden t f rom visua l insp ection n or ca n t he pro tect ion
aff orde d by th em nece ssarily be ob tain ed b y u sing rep lacemen t
compo ne nts ra ted f or hig he r voltage, watt ag e, etc. Rep lacemen t
p arts wh ic h ha ve th ese sp ecial s afet y ch ar act erist ics ar e
identified in the parts list of Servic e manual. El ec trical
components having su ch features are identified by shading
on the sche matics and by (!
!!
! ) on the parts list in Service
manual. The us e of a sub stitu te rep la cemen t which do es n ot
h ave th e same saf ety ch ar act er ist ics as t he reco mmen de d
replac ement part shown in the p arts list of S er vice man 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 erenc e of the G ND is sho wn b y th e LIV E : ( ") side GND, the
ISO LATE D(NEUTRAL) : (#) side G ND and EARTH : ($) side
GND. Do n't shor t b et ween the LIV E sid e GND an d
ISO LATE D(NEUTRAL) side GND or EARTH side GND and
n ever mea sure wit h a m ea sur ing a ppa ratus (oscillo scop e etc.)
th e LI VE sid e GND an d IS OLA TED(NE UTRAL ) side 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.
5. If any repair has been made to the chassis, it is recommended
th at t he B1 set ting shou ld b e ch ecke d or adju ste d (See
ADJUSTMENT OF B1 POW E R SUPPL Y).
6. The high voltage app lie d t o th e pictu re tu be mu st con form wit h
th at sp ecified in S ervice man ual. E xcessive h igh vo lt ag e ca n
cau se an incre ase in X-Ray emission , arcing an d possib 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 occurs, remove t he AC power
immed iately an d de termine th e ca use b y visua l insp ect ion
(in corr ect installat ion, cracke d or melted high vo lt age harn ess,
p oor so ld ering, et c.). To maint ain the p rope r min imu m le vel of
sof t X-Ray emission, c omp on en ts in the high voltag e circuitry
including t he pict ure tu be must b e t he e xact rep laceme nts or
alte rnat ives ap prove d b y th e ma nuf act urer of th e c omplet e
prod uct.
7. Do n ot c hec k high volt ag e b y dr awing an arc. Use a high volt ag e
meter or a hig h v oltage prob e wit h a V TVM. Discha rg e th e
picture tube before attempting meter connection, by connecting
a clip le ad to the grou nd f rame a nd c onn ecting th e oth er end of
the lead through a 10kΩ 2W resisto r to the an od e b utt on .
8. W hen se rvice is requ ire d, obser ve th e origina l lea d dr ess. E xtra
prec aut ion sh ould b e g ive n t o assure corr ect lea d dress in th e
high voltag e circuit a rea. W here a s hort circuit h as occu rre d,
th ose comp on ent s that indicate evidence of ove rhea ting sho uld
b e re place d. A lways u se th e ma nuf act urer's rep lacemen t
components.
9. Isolation Check
(Safety for Electrical Shock Hazard)
Af ter re-ass emb lin g the p r odu ct, always perf orm an isolat ion
ch eck on the expo sed metal p ar ts of t he cabin et ( a nte nn a
ter minals, video /au dio inpu t and ou tpu t t ermin als, Con trol kn obs,
metal cabin et, scr ewhe ad s, ea r ph one jack, con tr ol shaf ts, etc.)
to be su re th e p r odu ct is s af e t o o pe rate withou t d an ger of
elect rical shoc k.
(1) Dielectric Strength Test
The iso lation be tween the A C prima ry circu it an d all metal p arts
exp ose d t o th e us er, p articularly an y exp os ed met al part h aving a
return 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 hstand a vo lt ag e of 1 10 0V A C ( r .m. s.) t o an ap plianc e
rated up to 12 0V , an d 3 00 0V AC ( r .m. s.) to an ap plian ce r at ed
200V or more, for a period of one second.)
This method of test requires a t est equipment n ot generally found
in t he servic e trad e.
(2) Leakage Current Check
Plug th e A C lin e c ord d irect ly into th e A C ou tlet (d o n ot use a lin e
isolatio n tr ansf or m er du ring this ch eck.) . Usin g a " Lea kag e
Current Tester", me asure th e lea kag e cu rre nt f rom each exp osed
metal p art of the cabine t, p art icu larly any e xpos ed metal 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
grou nd (wa ter pip e, e tc.) . Any leaka ge curr en t must not e xceed
0.5mA AC (r.m.s.).
However, in tropic al ar ea , th is must no t exce ed 0.2 mA AC
(r.m.s.).
"
""
" Alte rnate Che ck Met hod
Plug th e A C lin e c ord d irect ly into th e A C ou tlet (d o n ot use a lin e
isolatio n tr an sfor m er during t his check.) . Use an AC vo lt me ter
h aving 100 0 oh ms per volt or m or e sens it ivity in th e fo llowing
mann er. Con nec t a 1 500Ω 10W res ist or para lle le d b y a 0 .1 5µF
AC-type c apa cit or bet ween an expo sed met al pa rt a nd a kno wn
g ood ear th gro un d (water pipe , etc.). Meas ure th e A C vo lt ag e
across th e res ist or with the AC vo ltmeter. Move th e resistor
con nec tion to e ach exp ose d metal part, p art icular ly a ny exp osed
metal p art havin g a r etu rn pat h to t he ch assis, an d m easu re th e
AC voltage ac ro ss the res ist or. No w, re verse th e plu g in th e AC
ou tlet and re pe at eac h mea suremen t. Any volt ag e measu re d
must not exc eed 0.75V AC (r.m.s.). This c orresponds to 0 .5mA
AC (r.m.s.).
However, in tropica l are a, this must not exceed 0.3V AC ( r.m. s.).
This corresponds to 0.2mA AC (r.m.s.).
0.15μF AC-T YPE
1500 Ω 10W
GOOD EARTH GROUND
PLACE THIS PROBE
ON E A CH EX PO SE D
ME T AL PA R T
AC VOLTMETER
(HAVING 1000 Ω/V,
OR MORE SENSITIVITY)
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
4
FEATURES
"
New chassis design en ables us e of an int eractive on-scree n c ont rol.
"
Wide ran ge volt age (1 10V ～240V) AC power input.
" With AUDIO / VI DE O INPUT & OUTPUT terminal.
"
MUTING but ton can red uce the a udio level to zero inst ant ly.
" Funct ion al remote co ntrol t o o pera te T V set (f or ch ann el se lect, volume c ontrol, p ower ON/OFF, etc. ) f rom a d ist anc e.
"
I
2
C bus control ut ilizes single chip ICs for IF, V /C, DEF. V SM PRES ET, PRESET & S ETUP TOUR.
" By m e ans of AUTO PROGRA M, th e TV s tatio ns c an b e s electe d aut omatica lly a nd the TV cha nn els can also b e rear r an ge d a ut om atically.
" Built-in ECO MODE (ECONOMY, ECOLOGY)
In accord anc e with th e brig ht ness in a r oo m, the bright ness and / of con tr ast of th e p icture can b e a djust ed au tom at ic ally to m ake th e
op timum pictu re which is eas y on the e ye.
"
Built – in ON TIMER, RETURN + & CHILD LOCK.
SYSTEM BLOCK DIAGRAM
IC301
VIDEO/CHROMA
DECORDER
IC702
MEMORY
TU001
TUNER
IC701
MICRO
COMPUTER
SCL1/SDA1
SCL2/SDA2
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
5
FUNCTIONS
■
FRONT PANEL
■
REAR TERMINAL
MENU buttons
CHANNEL
－
/
＋
buttons
VOLUME
－
/
＋
bu tto ns
AI ECO sensor
RE MO TE CONTROL s ens or
ON TIMER lamp
POWER lamp
MAIN POWER button
A/V INPUT t erminal
HE ADPHONE jack
1
2
3
4
5
6
7
8
9
10
10 9 1 2 3 4 5 6
7
8
ANT Terminal
VIDEO INPUT Terminal
VIDEO OUTPUT Terminal
AUDIO INPUT T erminal
AUDIO OUT PUT Terminal
1
2
3
4
5
2
3
4
5
1
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
6
■
REMOTE CONTROL UNIT
E xce pt f or d if ference in bo dy co lour, t he Remote Cont r ol
Unit RM-C3 64G Y and RM-C36 4 h ave exa ctly th e sa me
Func tions.
ECO SENSOR ke y
SOUND SYSTEM key
COLOUR SYSTEM ke y
TV/VIDEO key
OFF TIMER key
CHA NNEL SCAN k ey
RETURN＋key
DISPLAY key
CHANNEL key
POWER key
PICTURE MODE key
Number (CH.) key
－/－－key
MUTING key
MENU key
MENU ▲/▼ key
MENU －/＋ key
VOL UME－/＋ key
RM-C364GY : AV-20N3 / AV-20N3
/D
/ AV-20NMG3 / AV-20NMG3
/-A
RM-C364 : AV-20NMG3B
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
7
MAIN DIFFERENCE LIST
Part Name
Model Name
Main PWB Remote Control Unit Front Cabinet Rating Label
AV-20N3 SCG-1403A-H2
RM-C364GY-1H LC10438-027A-H LC2 0377-010B-H
AV-20N3
/D
SCG-1425A-H2
AV-20NMG3 SCG-1422A-H2
LC10438-029A-H
AV-20NMG3B
RM-C364-1H LC10438-033A-H
AV-20NMG3
/-A
RM-C364GY-1H LC10438-029A-H LC2 0413-002B-H
Part Name
Model Name
Picture Tube Inst Book Digest Manual
AV-20N3
A48LWX10X LCT1188- 001A-H LCT1189- 001A-H
AV-20N3
/D
AV-20NMG3 A48LDD095X LCT1196- 001A-H LCT1197- 001A-H
AV-20NMG3B
AV-20NMG3
/-A
Item
Model Name
TV RF System
Co l our Sy st em
[RF Mode]
Interm edi ate
Frequency
[SIF Carri er ]
OSD Language
AV-20N3 B/G, I, D/K PAL / SECAM
32.5MHz (5.5MHz)
31.5MHz (6.5MHz)
32.0MHz (6.0MHz)
E / R
AV-20N3
/D
E / C / M / I
AV-20NMG3 B/G, I, D/K,M
PAL / SECAM
NTSC3.58 / NTSC4.43
32.5MHz (5.5MHz)
33.5MHz (4.5MHz)
31.5MHz (6.5MHz)
32.0MHz (6.0MHz)
E / R / A / P
AV-20NMG3B
AV-20NMG3
/-A
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
8
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unp lu g t he po we r plu g.
2. As sh own in f igure , remove t he 6 screws marked
!
!!
!
an d a
screw marked "
""
".
3. W ithdr a w t he rear co ver to ward you.
REMOVING THE MAIN PW BOARD
" After removing the rear cover.
1. Slight ly raise t he bo th sid es of t he MAIN PW BOARD by ha nd .
2. W ithdr a w t he MAIN PW B OARD b ackward.
(If n ecess ary, take off the wire clam p, c onnect ors etc. )
REMOVING THE SPEAKER
"
After removing the rear cover.
1. As sh own in figu r e, remove th e 2 screws marked
#
##
#
.
2. Follow th e s ame st eps wh en removing th e other ha nd sp eak er .
CHECKIN G THE MAIN PW BOARD
1. To ch eck the ba ck side of th e PW B oard.
1) Pu ll out the MA IN PW Bo ard. (Ref er to RE MO VING THE MAIN
PW B oard)
2) Erect th e PW Board ve rt ic ally so that you ca n easily ch eck th e
b ack side of th e PW B oard.
[CAUTION]
" When e recting th e PW Board, be car ef ul s o t hat th ere will b e n o
con tact ing with ot her PW Board.
" Before turning on power, make sure that the CRT earth wire and
oth er conne cto r are p rope rly c onnect ed.
WIRE CLAMPING AND C ABLE T YING
1. Be sure t o clamp th e wire.
2. Never remo ve th e c able tie use d f or tying th e wire s to ge ther.
Sh ould it be inad ver te ntly r emove d, b e su re to tie th e wires wit h a
new cable tie.
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
9
CRT SOCKET
PWB
FRONT CABI.
POWER
CORD
SP EAKE R
SP EAKE R
MAIN PWB
C
C
REAR
COVER
B
A
(×
××
×2)
(×
××
×1)
(×
××
×6)
(×
××
× 2)
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
10
REPLACEMENT OF MEMORY ICs
1. MEMORY ICs
This mod el u ses memory I Cs. This me mo ry IC da ta are f or pro per oper a tion of th e vide o a nd d eflect ion circuits.
When rep lacing me mory ICs, be su re to us e ICs writ ten with t he initial va lu es of dat a.
2. PROCEDURE FOR REPLACING MEMORY ICs
(1) Power off
Switch the power of f and disco nn ect t he powe r plu g f rom t he wall out let.
(2) Replace ICs
Be sure to use memory ICs written with the initial data values.
(3) Power on
Connect th e p ower plu g int o t he wall ou tlet and switch t he po we r on .
(4) Check and set SYSTEM CO NSTANT SET
・
・・
・ It must not adjust without adjustment signals.
1) Pr ess t he DI SPLAY ke y and th e PICTURE MODE key of the REMOTE
CONTROL UNIT simultaneously.
2) The SERVICE MENU screen of Fig. 1 will be displayed.
3) While th e SE RV ICE MENU is displayed , again press the DI SPLAY key and
PICTURE MODE ke y simultaneo usly, an d t he S YSTEM CONSTA NT SE T
screen of Fig. 2 will b e displa ye d.
4) Check th e sett in g valu es of the SYS TEM CONSTA NT SET of T able 1 If th e
value is diff erent, select th e s etting ite m with the MENU ▼/▲key, and set
th e co rrect valu e with t he MENU - / + k ey.
5) Pr ess the DI SPLAY ke y twice, and retu rn t o th e n orm al scree n.
(5) Receive channel of setting
Refer to the OPERATI NG I NST RUCTIONS an d set th e r ece ive cha nn els
(chan ne ls pr eset) as describe d
(6) User Setting
Check t he us er s ettin g valu e of Tab le 2, and if se tting value is dif feren t, set
th e co rrect valu e.
For se tting, ref er to the OPERATI NG INSTRUCTIO NS.
(7) Setting of SERVICE MENU
Ve rif y the set ting it ems of th e SE RVICE MENU, and reset whe re n ecessa ry.
For se tting, ref er to the SERVICE ADJUSTMENTS.
S
ERVI
C
E MEN
U
1.IF 2.V
/C
3.DEF 4.VSM PRESET
5.PRESET
6.SETUP TOUR OFF
1-6 SELECT DISP : EXIT
******
************
****** *****
**********
***** **
****
**
.
***
******
***
*** ** **
*** ** ***** ** **
*** ** ** ** ***
** ***** ***
** ***
Fig.1
Fig.2
SY STEM CONSTANT-
Ⅰ
ⅠⅠ
Ⅰ
COL OUR :
BILINGUAL : N O
TUNE R : MU
ECO SENSOR : YES
LANG U AGE :
SYSTEM CONSTANT SE T 1
***
***
:
S
ELE
C
T
- / + : OPERATE DISP : EX IT
/
SY STEM CONSTANT- Ⅱ
ⅡⅡ
Ⅱ
B/B SOUND :
LOCK : 180
CO
L
OU
R A
U
T
O
:
QSS : MINT
ALC : NO
TEXT R ATE : 2 0
SYSTEM CONSTANT SE T 2
***
: SELECT
- / + : OPERATE DISP : EX IT
/
***
SY STEM CONSTANT- Ⅲ
ⅢⅢ
Ⅲ
AMP T UNER : NO
VNR : YES
TEXT TABLE : CYL
VOLUM PWM : POS
SYSTEM CONSTANT SET 3
: SELECT
- / + : OPERATE DISP : EXIT
/
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
MENU
▼
/
▲
key
MENU
－
/
＋
key
DISPLAY
key
PICT URE
MO DE ke y
NUMBERS
key
E xce pt f or d if ference in bo dy co lour, t he Remote Cont r ol
Unit RM-C3 64G Y and RM-C36 4 h ave exa ctly th e sa me
Func tions
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
11
SE TTING OF SY STEM CONSTANT SET
Setting value
Setting item Setting contents
AV-20N3 AV-20N3
/D
AV-20NMG3 AV-20NMG3B AV-20NMG3
/-A
COLOUR
TRIPLE MULTI.
BILINGUAL
NO
TUNER
MU
AI ECO S ENSOR
YE S
LA NG UA GE
E/R
E/C/M/I E/R/A /P
B/B SOUND
OFF
ON
LO CK
YES 10 20 ～ 230
250 240
18 0
COLOUR AUTO
NO
YE S
QSS
MI NT
ALC
NO
TEXT RA TE
10 20 40 80
20
AMP TUNER
NO
VNR
YE S
TEXT TABLE
CYL
VOL UM PW M
POS
Table 1
US ER SE TTING V ALUES
Setting item Setting value Setting item Setting value
SUB POWER ON LANGUAGE ENGLISH
CHA NNEL PO SITIO N 1 PO SITIO N CHA NNEL P RESET Refe r t o OPE RATING I NS TRUCTION
VOL UME About 10 AI ECO SENSOR OFF
TV/VIDEO
TV VNR OFF
ON SCREEN DI SPLAY
POSITION INDICATIO N AUTO SHUTOFF OFF
COLOUR SYSTEM PAL ON TIMER PR1 0:00
SOUND SYSTEM B / G BLUE BACK OFF
OFF TIMER OFF OSD.Shows 00 CHILD LOCK OFF
PICTURE MODE (VSM) BRIGHT
Table 2
YE S NO
YE S
NO
ON OFF
YE S NO
MI NT MQ SS
YE S NO
YE S NO
YE S NO
A
RA
CYL
MU
MA
MUL TI. PA LTRIPLE
POS NEG
E/R/A /P
E
/
R
E/C/M/I
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
12
INITIAL SETTING VALUE OF SERVICE MENU
1. Ad justment of the SE RVICE M ENU is m ade on the bas is of the initial s etti ng values ; howev er, t he new se tting va lues w hi ch
set the screen in its optimum condition may differ from the initial setting.
2. Do no t change the initial Setting Values of the Setting (Adjustment) items not listed In “ADJUSTMENT”.
2. V/C
Initial setting value
Colour sy stem
Setting item
Variabl e
range
PA L SE C AM NT SC 3.5 8 NT SC 4.4 3
RED
GREEN1. CUT OFF
BL UE
-128 ～+127
-50
RED
2. DRI VE
BL UE
-128 ～+127
+ 0
3. BR IG HT
-127～+127
+ 0
4. CONT .
-63 ～+63
+ 0
5. COLOUR -63
～
+63 + 0
TV
+ 0 + 0
AV -20N3
AV -20N3
/D
+0 - 2
6. TINT
VI DE O
AV -2 0N MG 3
AV -2 0N MG 3B
AV -2 0N MG 3
/-A
-63 ～+63
+8 - 2
7. SECAM BL ADJ. -31
～
+31
+ 0
TV - 8(Fixed)
8. SHARP
Do Not Ad j.
VI DE O
-32
～
+31
+15
(
Fixed
)
3. DEFLECTION
Initial setting value
Setting item Variable range
fv : 50Hz MODE fv : 60Hz MODE
1. VER. POS ITION -04 ～ +03 - 2 - 3
2. HOR. POSITION
-16 ～ +15
+1 + 4
3. VER. HEIGHT
-64 ～ +63
-40 + 0
4. VER . L INE AR IT Y
-32 ～ +31
+13 - 3
5. VER. SWCURVE
-32 ～ +31
-32 + 0
6. H OR. VC O ADJ UST
Do Not Ad j.
-63 ～ +62
+ 0 + 0
4. VS M PRE SE T
VS M
p
r ese t
VSM mode
Setting item
BRIGHT STANDARD SOFT
TINT SE TTING VA LUE +15
COLOUR SETTING VA LUE +15
BR IG HT SE TTING VA LUE +15
CONT . SE TTING VA LUE +30 +15 +11
SHARP SE TTING VA LUE +15 +12
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
13
5. PRESE T
The items in the following table, it is no requirement for adjustment.
If values had changed by the mi ss operation, set the initial setting values i n the fol lowing table .
Colour Sy stem Do No t Adjust
Initial setting value (Fixed value)
Setting item
PA L SE CAM NT SC 3.5 8 NT SC 4.4 3
1. C TRAP FIX 1 1 1 1
2. SHARP PEAK 0 0 0 0
3. ABL 1 1 1 1
4. GAMMA 0 0 0 0
TV 0 2 2 3
5. Y. DELAY TIME
VI DE O 0 2 0 2
6. BL ACK EX P START
＋3 ＋3 ＋3 ＋3
TV 1 1 0 0
7. C-BPF
VI DE O 1 1 1 1
8. CW / SCP 0 0 0 0
9. VIF DET LEVEL 0 0 0 0
11. IF AGC MIN 0 0 0 0
12 . VIF AGC 0 0 0 0
13. VIF PMOD 0 0 0 0
19 . VNR 15 15 15 15
20 . RGB LIM 1 1 1 1
21. RGB LIMIT LEVEL 2 2 2 2
23. TEXT H. POSITION -3 -3 -3 -3
24. READ DATA
Sound System D o No t Adju s t
Setting item B/G I D/K M
10. SIF DET LEVEL ＋0 ＋0 ＋0 ＋0
14. SIF BPF BW ADJUST
＋
0
＋
0
＋
0
＋
0
15. SIF TRAP FO ADJUST ＋0 ＋0 ＋0 ＋0
16. SIF TRAP FO ADJUST 2 ＋0 ＋0 ＋0 ＋0
17. SIF -TRAP 0 0 0 0
18. SIF -BPF 1 0 0 0
22 . SIF S W 0 1 1 1
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
14
REPLACEMENT OF IC301 (IF V/C DECODER)
" For the I C301(I F V /C DECODER) of this model, all data are written in the micr o-computer. So, wri te the data in the micro-
computer in accordance with the following procedures before starting adjustment.
PROCEDURES
(1) Tur n t he POWE R O FF.
(2) Replace t he IC30 1 with a n ew o ne .
(3) While pressing MENU bu tto n a nd VO L+ bu tto n ON the FRO NT CABINE T s imult ane ous ly, t urn th e POW ER O N. Wh en the POW ER is
turned ON, th e dat a is writ ten in the micro-co mputer immediately.
LOCATIONS OF FRONT PANEL BUTTONS AND LAM PS
MENU buttons
CHANNEL ･ / ･ buttons
(ME NU ･ / ･ butt ons)
VOLUME
－
/
＋
buttons
(MENU
－
/
＋
bu tto ns)
AI ECO sensor
REMOTE CONTROL sens or
ON TIMER lamp
POWER lamp
MAIN POW ER button
MENU buttons
CHANNEL －/＋buttons
(ME NU －/＋buttons)
VOLUME
－
/
＋
buttons
(MENU
－
/
＋
bu tto ns)
AI ECO sensor
REMOTE CONTROL sens or
ON TIMER lamp
POWER lamp
MAIN POW ER button
1
2
3
4
5
6
7
8
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
15
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
1. There ar e 2 w ay of adjus ti ng t hi s TV: One i s wi th the
REMOTE CONTROL UNIT and the other is the conventional
method using adjustment parts and components.
2. The adjustment with the REMOTE CONTROL UNIT is made
on the basis of the initial setting v alues. The setting values
which adjust the screen to its optimum condition may differ
from the initial setti ng val ues.
3. M ake s ure th at conn ect ion is c orrect ly made t o AC p ower
source.
4. Turn on t he p ower of th e se t and eq uipmen t bef ore us e, an d
start t he ad justmen t pr oc edure s af ter waitin g at least 30 min ute s.
5. Unless ot herwise spec if ied, p rep are th e mo st suita ble rec eptio n
or inp ut sign al for adjust ment.
6. Nev er touc h a ny adjus tme nt parts, whi ch ar e not spe cified
in t he li st f or thi s adjustme nt VRs , t ra nsfor ms, c ondenser s,
etc.
7. Pr ep ar atio n f or ad justmen t
Unless otherwise specified in the adjustment instructions, preset
the following functions with the REMOTE CONTROL UNIT.
User mode position
PICTURE MODE (VSM) BRIGHT
VNR OFF
TINT / COLOUR / BRIG HT
CONT. / SHARP
CENTER
BLUE BA CK OFF
OFF TIMER OFF
AI ECO S ENSOR OFF
AUTO SHUT OFF OFF
MEASURING INSTRUMENT AND FIXTURES
1. DC voltmeter (or digital voltmeter)
2. Oscilloscope
3. Sign al g ener at or (P att ern g en erat or) [ PAL / S ECAM / NTS C]
4. Remote control unit
ADJUSTMENT ITEMS
Ad justment item Ad justment item
B1 POWE R SUPPLY
DEFLECTION circuit adjustment
FOCUS adjustment VSM PRESET s etting
IF circ uit adjust ment
PURITY/ CO NV ERGENCE adjus tment
V/C (Video / Chroma) circuit adjustment
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
16
BASIC OPERATION OF SERVICE MENU
"
The adjustment using SERVICE MENU
The f ollowing adjus tment it ems u se t he SE RV ICE MENU in the ser ies of the adju stment . The ad ju stment s ar e m ade on the bas is of the
initial se tting valu es. Th e ad justment valu es which ad ju st t he screen to th e o ptimum co ndit ion c an b e diffe re nt from th e in itia l sett ing va lues.
With th e S ERVICE ME NU, var ious s ett in gs c an be made , and they ar e br oa dly classifie d in the f ollo win g ite ms of s ettin gs.
1.I F ････････････････････ ･･･ Adju stmen t of th e IF circuits.
2.V /C ･･･････ ･････････････ ･･ Ad ju stmen t of the VIDEO /CHRO MA circuit.
3.DEF ･･･････ ･･････････････ Adjustment of th e DEFLECTION circ uit.
4.V SM PRES ET ･･･････ ･････ Adjustmen t of th e init ia l sett ing value s of VSM co nd it ion as STA NDA RD, SOFT a nd BRIGHT.
(VSM : Video Status Memory)
5.PRESET
･･･････ ･･････････
Adju stmen t of th e RF circ uit [Do not adjust].
6. SETUP TOUR OFF ･･･････ It s hould b e able to select m ode (LANGUAG E a nd AUTO CH PRESE T)..
[Shou ld be OFF].
"
Key operation of the SERVICE MENU
[Enter to SERVICE MENU]
Press the DI SPLAY key and the PICTURE MODE key of the REMOTE CONTROL
UNI T simult an eou sly. Th en ent er the S ERVICE ME NU mod e as sh own in Fig.1 .
[Exit from SERVICE MENU]
When com plete th e ad just ment wor k, pr ess th e DI SPLAY key to return t o th e
SERVICE MENU.
An d then press th e DI SPLAY ke y ag ain, r eturn to th e n or m al screen .
[ Se lec t from SE R VICE M E NU ]
In SERVI CE M ENU, pr ess t he n umber (1 ～6) ke y of th e rem o te c ont ro l un it , to se lect
an y of th e ad justmen t ite ms.
The colo urs which se lected ite m ch aract ers a re ch ang ed .
SE RVICE MENU
SE RV ICE ME NU
1.IF 2.V/C
3
.DEF 4.V
S
M PRE
S
ET
5.PRESET
6.SETUP TOUR OFF
1-6 SELECT DISP : EXIT
******
************
***********
**********
***** **
****
**
.
***
******
***
*** ** **
*** ** ***** ** **
*** ** **** ***
** ***** ***
** ***
Fig.1
KEY ASSIGNMENT OF REMOTE CONTROL UNIT
MENU
▼/▲ key
MENU
－
/
＋
key
DI SP L A Y k e y
PICT URE
MO DE ke y
NUMBERS
key
Exce pt f or diff erenc e in bod y colo ur, t he Re mo te Control Uni
t
RM-C36 4G Y an d RM-C3 64 ha ve e xactly t he same Fu nctio ns.
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
17
[Method of setting]
1. IF
[1. VCO]
① 1 K ey ･･･････ ･････････････ ･････ Select 1.IF.
② 1 K ey ･･･････ ･････････････ ･････ Select 1.VCO
③ The VCO (CW) screen will be displayed a allow mark when the AFC voltage is at a certain level.
④ DISPLA Y K ey･･･････ ･･･････････ As you press this key twice, you will return to the SE RVICE ME NU.
[2. DELA Y POINT]
① 1 K ey･･･････ ･････････････ ･････ Select 1.IF.
② 2 K ey･･･････ ･････････････ ･････ Se lect 2.DELAY P OINT.
③ ME NU - /+ K ey ･･･････ ･･････････ Set (adjust) the setting values of the s ettin g ite ms.
④ DISPLAY Key･･････････････････ W hen th is is pr esse d t wice, you will ret urn t o t he SE RV ICE MENU.
2.V /C, 3.DEF and 4 .V SM PRES ET
① 2~4Key ････････････････････ ･･･ Select one from 2. V/C, 3. DE F an d 4. VSM PRE SET.
② MENU ▼/▲ Key ･･･････ ･･･････ Select s etting items.
③ MENU -/+ Key ･･･････ ･･････････ Adju st th e va lues of t he items.
④ DISPLA Y K ey ･･･････ ･･･････････ When this is pr esse d, re turn t o t he SE RVICE MENU.
6.SE TUP TOUR
① B y p ressing the 6 key, you can ch ang e t he ON or OFF ( should be OFF).
(Should be OFF)
%･
If it is ON, th en you turn th e TV po wer off , wh en you are t urn t he TV p ower o n a ga in.
The JVC’s logo will be shown about 15 seconds automatically.
② MENU -/+ Key ･･･････ ･･････････ Select Language.
③ MENU ▼ Key･･･････ ･･････････ Auto Se arch.
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
18
SERVICE MENU FLOW CHART
SE RVICE MENU
IF
1. VCO
2. D ELAY POI NT
1-2 : SELECT DISP : EXIT
SU B M E NU 1. I F
VCO (CW)
***.**
MH z
TOO HIGH
ABOVE REF ERENCE
JUS
T REFEREN
C
E
BELOW REFERENCE
TOO LOW
AFT ADJUST
** *(* *)
** *(* *)** *(* *)
** *(* *)
VCO ADJUST
** *(* *)
** *(* *)** *(* *)
** *(* *)
FINE
DISP : EXIT
DELAY POINT UHF
AGC TAKE-OVER
**
- / + : OPERATE DISP : EXIT
6
.
S
ET
U
P T
OU
R
O
N
/
OFF
(
B
y
p
ressin
g
6-ke
y)
BRI GHT
TINT
COLOUR
BRI
G
HT
CONT.
SHARP
- / + : OPERATE DISP : EXIT
**
**
**
**
**
SUB ME NU 4. V SM PRES ET
/ :SELECT
DEF
- / + : OPERATE DISP : EXIT
***
SU B M E NU 3. D EF
/ :SELECT
50Hz
1. VER. POSITI ON
PAL
V/C PAL
1.
CU
T
O
FF
- / + : OPERATE DISP : EXIT
(
R
)
* **
(G)
* **
(B)
* **
50Hz
SU B M E NU 2. V /C
/ :SELECT
PRESET
1. C -T RAP FI X
- / + : OPERATE DISP : EXIT
***
50Hz
SUB ME NU 5. P RE SET
/ :SELECT
B/ G
PAL
S
ERVI
C
E MEN
U
1.IF 2.V/C
3.DEF 4.VSM PRESET
5.PRESET
6.SETUP TOUR OFF
1-6 SELECT DISP : EXIT
******
************
****** *****
**********
***** **
****
**
.
***
******
***
*** ** **
*** ** ***** ** **
*** ** ** ** ***
** ***** ***
** ***
O
FF
No. 52025
A
V-20N
3
A
V-20NMG3
A
V-20NMG3B
19
ADJUSTMENT LOCATIONS
S
1Pin TP-91(B1)
2Pin NC
3Pin X-ra
y
1
4Pin X-ra
y
2
5Pin TP-E
(
)
HVT
S
1
HV
U
IC301
MEMORY IC
IC702
IC701
F9 01
DEG
TU001
FRONT
TOP
MAIN PWB
CRT SOCKET PWB
(SOLDER SIDE)
TP-4 7G/R
E1
U
T
PW
UPPER:FOCUS
LOWER:SCREEN
TP-47R/G
TP-47B
TP-E
T
CRT EARTH WIRE
(BRAIDED ASS'Y)
No. 52025
A
V-20N3
A
V-20NMG3
A
V-20NMG3B
20
ADJUSTMENTS
B1 POWER SUPPLY
Item
Measuring
instrument
Test point Ad justment part Description
Check of
B1 Power
Supply
Signal
generator
DC Volt -
meter
TP-91 ( B1)
TP-E (#
##
#)
1. Input a wh ole black sig na l.
2. Con nect a DC vo lt meter t o TP-9 1(B1) a nd TP-E (#).
3. M ake sur e t hat th e volt ag e is DC1 16. 5±2.0 V.
FOCUS ADJUSTMENT
Item
Measuring
instrument
Test point Ad justment part Description
Ad just ment
of FOCUS
Signal
generator
FOCUS VR
[In HVT]
1. Input a cross-hatch signal.
2. While watchin g th e s cr een, ad ju st the FO CUS V R t o make the
vertical and ho rizo ntal lin es as f ine a nd sha rp as possib le.
3. M ake sur e th at when the scree n is d arken ed, the lines re main in
g ood focu s.
IF CIRCUIT ADJUSTMENT
Item
Measuring
instrument
Test point Ad justment part Description
●Please use signal generator which is correct proof about the
sen ding freq ue ncy.
Ad just ment
of VCO
(
CW
)
Signal
generator
Remote
control unit
1. VCO
1. Inp ut the PA L f ull colo ur b ar (2 10 .2 5MHz) sig nal.
2. Enter th e SERVICE MENU.
3. Select 1.IF f rom the SERV ICE MENU.
4. Press 1 ke y an d s elect 1. VCO.
5. Select VCO ADJUS T with MENU ▲/▼ key.
6. Press MENU -/+ k ey unt il th e co lour of t he c haract ers TOO
HIGH ch an ges b lu e to ye llo w. Th en g rad ually press th e MENU
-/+ key u ntil the TOO LOW ch ang es yellow. At this t ime, conf irm
th at t he valu e of VCO ADJUST is n ear +00 .
7. Select AFT ADJUST with MENU ▲/▼ key.
8. Press MENU -/+ key until the characters JUST REFERENCE
ch ang es b lue to yellow.
9. Press the DI SPLAY key three times to return to normal screen.
VCO (C W)
***.**
MHz
TOO HIGH
AB OVE REFEREN CE
JU ST REFER ENCE
BELOW R EFEREN CE
TOO LOW
AFT AD JUST
** *(* *)
** *(* *)** *(* *)
** *(* *)
VCO ADJUST
** *(* *)
** *(* *)** *(* *)
** *(* *)
FINE
DISP : EXIT
YE LLOW
D
o
n
ot
adjust
ADJUSTMENT AT THIS POINT IS USELESS
ABOVE REFERENCE
TOO HIGH
B EL O W RE F E RE NC E
JUS
T REFE RE N
C
E
TOO LOW
ADJUSTMENT POINT
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
/