JVC AV-20N3 User manual

No. 52025

Jun. 2002

AV-20N3

AV-20NMG

3

AV-20NMG3

B

1

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

/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

MAIN PWB

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

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

/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

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JVC AV-20N3 User manual

JVC AV-20N3 User manual

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