JVC AV16N81/VT, AV-16N81G/VT, AV-20N81/VT, AV-21D81/VT Service Manual

A

A

A

A

SERVICE MANUAL

COLOUR TELEVISION

AV-21D81

/VT

V-21D81
V-20N81
V-16N81

V-16N81G

BASIC CHASSIS

CL-M

[AV-20N81
[AV-16N81

[AV-16N81G

AV-20N81
AV-16N81

AV-16N81G

/VT

]

/VT

]

/VT

]

/VT

/VT

/VT

[AV-21D81

/VT

]

CONTENTS

SPECIFICATIONS



SAFETY PRECAUTIONS



FEATURES



FUNCTIONS



MAIN DIFFERENCE LIST



SPECIFIC SERVICE INSTRUCTIONS



SERVICE ADJUSTMENTS



PARTS LIST



★

OPERATING INSTRUCTIONS

★

STANDARD CIRCUIT DIAGRAM

1

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

COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.

･････････････････････････････

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17
33

2-1

2
3
4
5
7
8

No. 51902

Dec. 2001

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

SPECIFICATIONS

ITEM

Dimensions(W×H×D)

Mass

TV RF System

RF Mode

Colour System

VIDEO Mode

Picture Tube

High Voltage

Receiving

Intermediate
Frequency

Colour Sub Carrier Frequency

VHF (VL) 46.25MHz～168.25MHz

VHF (VH) 175.25MHz～463.25MHz

UHF 471.25MHz～863.25MHz

CATV

VIF Carrier 38.0MHz

SIF Carrier

AV-21D81

598mm×468mm×478mm

21kg

B/G, D/K, M (W /O system I)

PAL / SECAM
NTSC3.58 / NTSC4.43

PAL / SECAM
NTSC3.58 / NTSC4.43

Visible size: 51cm measured
diagonally

28.0kV±1.0kV(at zero beam
current)

Cable TVs of Mid (X-Z, S1-S10)
Super (S11-S20) & Hyper (S21­S41) bands receivable

32.5MHz(5.5MHz)

33.5MHz(4.5MHz)

31.5MHz (6.5MHz)

32.0MHz (6.0MHz)

PAL (4.43MHz),
SECAM(4.40625MHz/4.25MHz)
NTSC (3.58MHz / 4.43MHz)

/VT

CONTENT

AV-20N81

619mm×458mm×488mm 518mm×391.5mm×403mm

19kg 13kg

Visible size: 48cm measured
diagonally

26.5kV±1.0kV(at zero beam
current)

/VT

AV-16N81

Visible size: 38c m measured
diagonally

23.0kV±1.0kV(at zero beam
current)

/AV-16N81G

/VT

/VT

Power Input

Power Consumption

Speaker

Audio Output

Aerial Input Terminal

Input

Output

Remote Control Unit

Rated Voltage AC110～240V, 50 / 60Hz

Operated Voltage AC90～260V, 50 / 60Hz

110W (Max) / 78W (Avg) 89W (Max) / 67W (Avg)

5cm×12 cm, Oval type×25cm

5W +5W (Playb ack Ster eo)

75Ω Unbalanced

Video 1V(p-p), 75Ω (Front / Rear)

500mV(r ms) (-4dBs), High

Audio

Video 1V(p-p), 75

Audio

impedance,
RCA×2 (Front / Rear)

Ω

500mV(r ms) (-4dBs), Low
impedance,

RCA×1

RM-C378
(Battery size : AA / R06 / UM-3

2)

×

Design and specifications are subject to change without notice.

9 cm, Oval type×2

×

2

No. 51902

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SAFETY PRECAUTIONS

V-21D81
V-20N81
V-16N81

V-16N81G

1. The design of this product cont ains special hardware, many
circuits and components specially for safety purposes. For
continued protection, no changes should be made to the original
design unless authorized in writing by the manufacturer.
Replacement parts must be identic al to those used in the original
circuits. Service should be performed by qualified personnel
only.

2. Alterations of the design or circuitry of the products should not be
made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the manufacturer
of responsibility for personal injury or property damage resulting
theref rom.

3. Many electric al and mechanical parts in the products have
special safety-related characteristics. These characteristics are
often not evident from visual inspection nor can the protection
afforded by them necessarily be obtained by using replacement
components rated for higher voltage, wattage, etc. Replacement
parts which have these special safety characteristics are
identified in the parts list of Service manual.

components having such features are identified by shading
on the schematics and by (
manual.

have the s ame safety characteristics as the recommended
replacement part shown in the parts list of Service manual may
cause shock, fire, or other hazards.

The us e of a substitute replacement which does not

) on the parts list in Service



Electrical

4.

Don't short between the LIVE side ground and ISOLATED
(NEUTRAL) side ground or EARTH side ground when
repairing.

Some model's power circuit is partly different in the GND. The
differenc e of the GND is shown by the LIVE : () side GND, the
ISOLATED(NEUTRAL) : () side GND and EARTH : () side
GND. Don't short between the LIVE side GND and
ISOLATED(NEUTRAL) side GND or EARTH side GND and
never meas ure with a measuring apparatus (oscilloscope etc.)
the LIVE side GND and 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
that the B1 setting should be checked or adjusted (See
ADJUSTMENT OF B1 POWER SUPPLY).

6. The high voltage applied to the pictur e tube must conform with
that specified in Service manual. Excessive high voltage can
cause an incr ease in X-Ray emission, arcing and possible
component damage, therefore operation under excessive high
voltage conditions should be kept to a minimum, or should be
prevented. If severe arcing occurs, remove the AC power
immediately and det ermine the caus e by visual inspection
(incorrect installation, cr acked or melted high voltage harness,
poor soldering, etc.). To maintain the proper minimum level of
soft X-Ray emission, components in the high volt age circuitry
including the picture tube must be the exact replacements or
alternatives approved by the manuf acturer of the complete
product.

7. Do not check high voltage by dr awing an arc. Use a high voltage
meter or a high voltage probe with a VTVM. Discharge the
picture tube before attempting meter connection, by connecting
a clip lead to the ground frame and connecting the other end of
the lead through a 10k: 2W resistor to the anode button.

8. W hen service is required, observe the original lead dress. Extra
precaution should be given to assure correct lead dress in the
high voltage circuit area. W here a short circuit has occurred,
those components that indicat e evidenc e of overheating should
be replaced. Always us e the manufacturer's replacement
components.

9.

Isolation Check
(Safety for Electrical Shock Hazard)

After re-assembling the product, always perf orm an isolation
check on the exposed metal parts of the cabinet (antenna
terminals, video/audio input and output terminals, Control knobs,
metal c abinet, screwheads, earphone jack, c ontrol shafts, etc.)
to be sure the product is safe to operate without danger of
electr ic al shoc k.

(1)

Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts
exposed to the user, particularly any expos ed metal part having a
return path to the chass is should withstand a voltage of 3000V
AC (r.m.s.) for a period of one second.

(. . . . Withstand a voltage of 1100V AC (r.m.s.) to an applianc e

rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated
200V or more, for a period of one second.)
This method of test requires a test equipment not gener ally found
in the s ervice trade.

(2)

Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line
isolation transformer dur ing this check.). Using a " Leakage
Current T ester", measure the leakage current from each exposed
metal part of the cabinet, particularly any exposed metal part
having a return path to the chassis, to a known good earth
ground (water pipe, etc.). Any leakage c urrent must not exceed

0.5mA AC (r.m.s.).
However, in tr opical area, this must not exceed 0.2mA AC
(r.m.s.).

Alternate Check M ethod

zzzz

Plug the AC line cord directly into the AC outlet (do not use a line
isolation transformer during this check. ). Use an AC voltmeter
having 1000 ohms per volt or more sensitivity in the f ollowing
manner. Connect a 1500: 10W resistor paralleled by a 0.15PF
AC-type capacitor between an expos ed metal part and a known
good earth ground (water pipe, etc.). Measure the AC voltage
across the resistor with the AC voltmeter. Move the resistor
connection to each exposed metal part, particularly any exposed
metal part having a return path to the chassis, and measure the
AC voltage across the resist or. Now, reverse the plug in the AC
outlet and repeat each measurement. Any voltage meas ured
must not exceed 0.75V AC (r.m.s.). This corresponds to 0.5mA
AC (r.m.s.).
However, in tr opical area, this must not exc eed 0.3V AC (r.m.s.).
This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER

0.15μF AC-T YPE

1500

GOOD EARTH GROUND

:

(HAVING 1000
OR MORE SENSITIVITY)

10W

/V,

:

PLACE THIS PROBE
ON EACH EXPOSED
METAL PART

No.51902

3

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

FEATURES

New chassis design enables use of an interactive on-screen control.

z

Wide range voltage (R ated 110V～240V,Operated 90V～260V) AC power input.

z

With AUDIO / VIDEO INPUT & OUTPUT terminal.

z

MUTING button can reduce the audio level to zero instantly.

z

Functional remote control to operate TV set (for channel select, volume control, power ON/OFF, etc.) from a distance.

z

2

C bus control utilizes single chip ICs for IF, V/C, VSM PRESET.

I

z

By means of AUTO PROGRAM, the TV stations can be s elected automatically and the TV channels can als o be rearranged automatically.

z

Built-in AI ECO (ECONOMY, ECO LOGY) sensor.

z

In accordance with the brightness in a room, the brightness and / or contrast of the picture can be adjust ed automatically to make the
optimum picture which is easy on the eye.

Built - in ON TIMER, RETURN + & CHILD LOCK.

z

SYSTEM BLOCK DIAGRAM

IC702

MEMORY

SCL2/SDA2

IC701

MICRO

COMPUTER

IC201

VIDEO/CHROMA

DECORDER

SCL1/SDA1

TU001

TUNER

4

No. 51902

A

A

A

A

FUNCTIONS

A

FRONT PANEL

■

( AV-21D81 )

V-20N81

AV-16N81/AV-16N81G

MENU buttons

①

CHANNEL －/＋ buttons

②

VOLUME －/＋ buttons

③

ECO sensor

④

REMOTE CONTROL sensor

⑤

ON TIMER lamp

⑥

POWER lamp

⑦

MAIN POWER button

⑧

A/V INPUT terminal

⑨

V-21D81
V-20N81
V-16N81

V-16N81G

REAR TERMINAL

■

①

②③④⑤ ⑦⑧⑨① ⑥

②
④

⑤

⑥
⑦

③

AV-20N81
AV-16N81/AV-16N81G

ANT Terminal

①

VIDEO INPUT Terminal

②

VIDEO OUTPUT Terminal

③

AUDIO LEFT INPUT Terminal

④

AUDIO RIGHT INPUT Terminal

⑤

AUDIO LEFT OUTPUT Terminal

⑥

AUDIO RIGHT OUTPUT Terminal

⑦

No. 51902

5

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

REMOTE CONTROL UNIT(RM-C378)

■

DISPLAY key

①

MENU key

②

MENU ▲/▼ key

MENU －/＋ key

LIVE SPATIAL key

③

CHANNEL －/＋ key

④

SOUND SYSTEM key

⑤

COLOUR SYSTEM key

⑥

TV / VIDEO key

⑦

PICTURE MODE key

⑧

CHANNEL SCAN key

⑨

RETURN+ key

⑩

POWER key

⑪

VOLUME －/＋key

⑫

MUTING key

⑬

NUMBER (CH.) key

⑭

⑮ －/－－

⑯

⑰

⑱

key

OFF TIMER key

ECO SENSOR key

PICTURE BOOSTER key

6

No. 51902

A

A

A

A

MAIN DIFFERENCE LIST

V-21D81
V-20N81
V-16N81

V-16N81G



Part Name

MAIN PW B SCL-1299A-CK SCL-1295A-CK SCL-1296A-CK

CRT SOCKET PWB SCL-3012A-CK SCL-3013A-CK

FRONT CABINET LC11129- 010A-HK LC10438- 026A-HK GG10021-004A GG10021-005A



POWER KNOB GG30019-001B-H LC30663- 003A-H LC30616- 004A-H



CONTROL KNOB GG20006-001A-H LC20318-003A-H LC20292-004A-H



E.E.WINDOW GG30020-001A-H LC30664- 001B-H LC30617- 001C-H



JVC MARK CM48125-009 CM48006-007-C LC40606-003A

PICTURE TUBE A51JSW 51X07 A48JLL91X01 A38JLL91X13



SPEAKER QAS0032-001 CEBSS12D-04KJ2 CEBSS09D-03KJ2

REAR COVER GG10130-010A-HK LC10448- 001B-HK LC10618- 001A



PACKING CASE GG10007-021A-E GG10007-020A-E GG10007-018A-E GG10007-019A -E

RATING LABEL GG20016-008A-E GG20016-006A-E GG20016-005A-E GG20001-030A-H



Model Name

AV-21D81

/VT

AV-20N81

/VT

AV-16N81

/VT

AV-16N81G

/VT

SERIAL LABEL GG40015-001A-E CM43936-001

Dimension (W×H×D) 598mm×468mm×478mm 619mm×458mm×488mm 518mm×391.5mm×403mm

Mass 21kg 19kg 13kg

Picture T ube

High Voltage 28.0kV±1.0kV 26.5kV±1.0kV 23.0kV±1.0kV

Power Consumption 110W (Max) / 78W (Avg) 89W (Max) / 67W (Avg)

Speaker

Visible size: 51cm
measured diagonally

5cm×12 cm, Oval type×25cm

Visible size: 48cm
measured diagonally

Visible size: 38cm
measured diagonally

9 cm, Oval type×2

×

No. 51902

7

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

2. As shown in figure, r emove the
screws marked

2

3. Withdraw the rear cover toward you.

$$$$

.

screws marked

7

REMOVING THE PW BOARD

After removing the rear cover.

z

1. Slightly raise the both sides of the PW BOARD by hand.

and remove the PWB stopper marked

2. W ithdraw the PW BOARD backward.

(If necessary, take off the wire clamp, connectors etc.)

from the front cabinet.

&&&&

REMOVING THE SPEAKER

After removing the rear cover.

z

1. As shown in figure, remove the

2. Follow the s ame steps when removing the other hand speaker.

screws marked

4

%%%%

####

.

and the

CHECKING THE PW BOARD

1. To check the back side of the PW Board.

1) Pull out the PW Board. (Refer to REMOVING THE MAIN PW
Board)

2) Erect the PW Board vertic ally s o that you can easily c heck the
back side of the PW Board.

[CAUTION]

When erecting the PW Board, be careful so that there will be no

z

contac ting with oth er PW Boar d.

Before turning on pow er, make sur e that the CRT earth wire and

z

other connector are properly connected.

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.

2. Never remove the c able tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires with a
new cable tie.

8

No. 51902

A

A

A

A

■■■■

AV-21D81

FRONT CABI.

CRT SOCKET

PWB

SPEAKER

PW BOARD

C

（×

（×4））））

（×（×

V-21D81
V-20N81
V-16N81

V-16N81G

SPEAKER

POWER

CORD

REAR

COVER

（×

（×4））））

（×（×

C

D

PWB

STOPPER

B

（×

（×2））））

（×（×

A

（×

（×7））））

（×（×

No. 51902

9

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

2. As shown in figure, r emove the
screws marked

2

3. Withdraw the rear cover toward you.

$$$$

.

screws marked

6

REMOVING THE PW BOARD

After removing the rear cover.

z

1. Slightly raise the both sides of the PW BOARD by hand.

2. W ithdraw the PW BOARD backward.

(If necessary, take off the wire clamp, connectors etc.)

REMOVING THE SPEAKER

After removing the rear cover.

z

1. As shown in figure, remove the

2. Follow the s ame steps when removing the other hand speaker.

screws marked

2

CHECKING THE PW BOARD

1. To check the back side of the PW Board.

1) Pull out the PW Board. (Refer to REMOVING THE MAIN PW
Board)

2) Erect the PW Board vertic ally s o that you can easily c heck the
back side of the PW Board.

[CAUTION]

When erecting the PW Board, be careful so that there will be no

z

contac ting with oth er PW Boar d.

Before turning on pow er, make sur e that the CRT earth wire and

z

other connector are properly connected.

%%%%

####

.

and the

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.

2. Never remove the c able tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires with a
new cable tie.

10

No. 51902

A

A

A

A

■■■■

AV-20N81

V-21D81
V-20N81
V-16N81

V-16N81G

FRONT CABI.

SPEAKER

SPEAKER

REAR

COVER

C

(

××××

2)

POWER

CORD

CRT SOCKET

PWB

PW BOARD

C

(

2)

××××

(

2)

××××

B

A

(

6)

××××

No. 51902

11

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

2. As shown in figure, r emove the

screws marked

2

3. Withdraw the rear cover toward you.

$$$$

.

screws marked

5

REMOVING THE PW BOARD

After removing the rear cover.

z

1. Slightly raise the both sides of the PW BOARD by hand.

and remove the PWB stopper marked

2. W ithdraw the PW BOARD backward.

(If necessary, take off the wire clamp, connectors etc.)

from the front cabinet.

&&&&

REMOVING THE SPEAKER

After removing the rear cover.

z

1. As shown in figure, remove the

2. Follow the s ame steps when removing the other hand speaker.

screws marked

4

%%%%

####

.

and the

CHECKING THE PW BOARD

1. To check the back side of the PW Board.

1) Pull out the PW Board. (Refer to REMOVING THE MAIN PW
Board)

2) Erect the PW Board vertic ally s o that you can easily c heck the
back side of the PW Board.

[CAUTION]

When erecting the PW Board, be careful so that there will be no

z

contac ting with oth er PW Boar d.

Before turning on pow er, make sur e that the CRT earth wire and

z

other connector are properly connected.

WIRE CLAMPING AND CABLE TYING

1. Be sure to clamp the wire.

2. Never remove the c able tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires with a
new cable tie.

12

No. 51902

A

A

A

A

■■■■

AV-16N81 / AV-16N81G

FRONT CABI.

CRT SOCKET

PWB

SPEAKER

PW BOAR D

V-21D81
V-20N81
V-16N81

V-16N81G

(

4)

××××

C

SPEAKER

REAR

COVER

POWER

CORD

C

(

4)

××××

D

PWB

STOPPER

B

(

2)

××××

(

5)

××××

A

No. 51902

13

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

REPLACEMENT OF MEMORY ICs

1. MEMORY ICs

This model uses memory ICs. This memory IC data are for proper operation of the video and deflection circ uits.
When replacing memory ICs, be sure to use ICs written with the initial values of data.

2. PROCEDURE FOR REPLACING MEMORY ICs

(1) Power off

Switch the power off and disconnect the power plug from the wall outlet.

(2) Replace ICs

Be sure to use memory ICs written with the initial data values.

(3) Power on

Connect the power plug into the wall outlet and switch the power on.

(4) Check and set SYSTEM CONSTANT SET

It must not adjust without adjustment signals.

・・・・

1) Press the

DISPLAY

CONTROL UNIT simultaneously.

2) The SERVICE MENU screen of Fig. 1 will be displayed.

3) While the SERVICE MENU is displayed, again press the

PICTURE MODE

screen of Fig. 2 will be displayed.

4) Check the setting values of the S YSTEM CONSTANT SET of T able 1 If the
value is different, s elect the setting item with the

the correct value with the

5) Press the

DISPLAY

(5) Receive channel of setting

Refer to the

(channels preset) as described

(6) User Setting

Check the user setting value of Table 2, and if setting value is different, set

the correct value.

For setting, refer to the

(7) Setting of SERVICE MENU

Verify the setting items of the SERVICE MENU, and reset where necessary.

For setting, refer to the

key and the

PICTURE MODE

key of the REMOTE

DISPLAY

key simultaneously, and the SYSTEM CONSTANT SET

▼/▲key, and set

MENU

- / + key.

MENU

key twice, and return to the normal screen.

OPERATING INSTRUCTIONS

OPERATING INSTRUCTIONS

SERVICE ADJUSTM ENTS

and set the receive channels

.

.

key and

SERVICE MENU

1.IF 2.V/C

3.VSM PRESET

1-3 SELECT DISP : EXIT

******

***********

***** **

************

**********

*** ** **

*** ** **** ***

*** ** ***** ** **

**.***

****

** ***

** ***** ***

Fig.1

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 1/3

1.INCH : 21

2.COLOUR : MULTI

3.VIDEO INPUT : 1

4.ECO SENSOR : Y ES

5.SUPER BASS : NO

: SELECT
: OPERATE DISP : EXIT

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 2/3

6.SPATIALIZER : YES

7.VOL LIMITER : YES

8.B/B SOUND : NO

9.TEXT : NO

10.COLOUR AUTO : NO

: SELECT
: OPERATE DISP : EXIT

SYSTEM CONSTANT-

***

******

ⅠⅠⅠⅠ

ⅡⅡⅡⅡ

ⅢⅢⅢⅢ

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

SYSTEM CONSTANT SET 3/3

11.LANGUAGE : E/V

12.TUNER : MU

13.AMP TUNER : YES

14.VNR : NO

: SELECT
: OPERATE DISP : EXIT

Fig.2

14

No. 51902

A

A

A

A

SETTING OF SYSTEM CONSTANT SET

Setting item Setting contents Setting value

V-21D81
V-20N81
V-16N81

V-16N81G

1. INCH

2. COLOUR

3. VIDEO INPUT

4. ECO SENSOR

5. SUPER BASS

6. SPATIALIZER

7. VOL LIMITER

8. B/B SOUND

9. TEXT

10.COLOUR AUTO

11.LANGUAGE

12.TUNER

13.AMP TUNER

14.VNR

21 14 29 25

MULTI

3

1

YES NO

YES NO

YES NO

YES NO

YES NO

YES NO

YES NO

E/V

MU

YES NO

YES

E

MA

NO

21

PALTRIPLE

MULTI

1

YES

NO

YES

YES

NO

NO

NO

E/V

MU

YES

NO

Table 1

USER SETTING VALUES

Setting item Setting value Setting item Setting value

MAIN POWER SW OFF PICTURE MODE (VSM) BRIGHT

SUB POWER ON LANGUAGE VIET

CHANNEL POSITION 1 POSITION CHANNEL PRESET Refer to OPERATING INSTRUCTION

VOLUME

TV/VIDEO

ON SCREEN DISPLAY POSITION INDICATION AUTO SHUTOFF OFF

COLOUR SYSTEM PAL ON TIMER PR1 0:00

SOUND SYSTEM B / G BLUE BACK OFF

OFF TIMER OFF ( shown : 00 ) TREBLE CENTER

LIVE SPATIAL OFF BASS CENTER

CHILD LOCK OFF BALANCE CENTER

PICTURE BOOSTER OFF

About 10 ECO SENSOR OFF

TV VNR OFF

Table 2

No. 51902

15

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

INITIAL SETTING VALUE OF SERVICE MENU

1. Adjustment of the SERVICE MENU is made on the basis of the initial setting values ; however, the new setting values which
set the screen in its optimum condition may differ from the initial setting.

2. Do not change the initial Setting Values of the Setting (Adjustment) items not listed In “ADJUSTMENT”.

2. V/C

Colour system

Setting item

1. CUT OFF

2. DRIVE

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT

7. BLACK OFFSET

8. SHARP

9. TEXT(RGB)CONT.

(Do Not Adj.)

RED

GREEN

BLUE

RED

BLUE

TV

VIDEO

R-Y

B-Y

TV

VIDEO

(Do Not Adj.)

Initial setting value

PAL SECAM NTSC 3.58 NTSC 4.43

+00

+00

+03

-05

+28 +21 +22 -02

+02 -02

+00 +00

+02

-02

+10(AV-21D81)
+05(AV-20N81)
+05(AV-16N81)
+05(AV-16N81G)
+08(AV-21D81)
+03(AV-20N81)
+03(AV-16N81)
+03(AV-16N81G)

+15

10. H CE NTER

11. V HEIGHT

12. V LI N

13. V. S-CR

14. V CENTER

15.AM P T . SHARP

3. VSM PRESET

VSM preset

VSM mode

Setting item

SETTING VALUE +15

TINT

COLOUR

BRIGHT

CONT.

SHARP

SETTING VALUE +15

SETTING VALUE +15

SETTING VALUE +30

SETTING VALUE +15

-10 -08

-04 +04

+02 -04

-40 +20

+00

-15

BRIGHT STANDARD SOFT

+19(AV-21D81/AV-20N81)
+24(AV-16N81/AV-16N81G)

+11(AV-21D81/AV-20N81)

+17(AV-16N81/AV-16N81G)

+12(AV-21D81/AV-20N81)
+10(AV-16N81/AV-16N81G)

16

No. 51902

A

A

A

A

SERVICE ADJUSTMENTS

BEFORE STARTING SERVICE ADJUSTMENT

1. There are 2 way of adjusting this TV: One is with t he
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 values. The setting values
which adjust the screen t o its optimum condition may differ
from the initial setting values.

3. Make sure that connection is correctly made to AC power
source.

4. Turn on t he power of the set and equipment before use, and
start the adjustment procedures after waiting at least 30 minutes.

5. Unless otherwise specified, prepare the most suitable rec eption
or input signal for adjustment.

6.

Never touch any adjustment parts, which are not specified
in the list for this adjustment VRs, transforms, cond ensers,
etc.

7. Preparation for adjustment
Unless otherwise specified in the adjustment instructions, preset
the following functions with the REMOTE CONTROL UNIT.

User menu preset value

PICTURE MODE (VSM) BRIGHT

VNR OFF

TINT / COLOUR / BRIGHT /
SHARP / CONT.

BLUE BACK OFF

OFF TIMER OFF

ECO SENSOR OFF

AUTO SHUT OFF OFF

V-21D81
V-20N81
V-16N81

V-16N81G

MENU ITEM PRESET VALUE

CENTER

MEASURING INSTRUMENT AND FIXTURES

1. DC voltmeter (or digital voltmeter)

2. Oscill oscope

3. Signal generator (Pattern generator) [PAL / SECAM / NTSC]

4. Remote c ontrol unit

ADJUSTMENT ITEMS

Adjustment item

B1 POWER SUPPLY V/C (Video / Chroma) circuit adjustment

FOCUS adjustment

IF circuit adjustment PURITY / CONVERGENCE adjustment

VSM PRESET setting

No. 51902

17

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

BASIC OPERATION OF SERVICE MENU

The adju stment using SERVICE MENU

z

The following adjustment items use the SERVICE MENU in the series of the adjustment. The adjustments are made on the basis of the
initial s etting values. The adjustment values which adjust the screen to the optimum c ondition can be diff erent from the initial setting values.
With the SERVICE MENU, various settings c an be made, and they are broadly classified in the following items of s ettings.

1.IF

･･･････････････････････

2.V/C

･･････････････････････

3.VSM PRESET

Key operation of the SERVICE MENU

z

[Enter to SERVICE MENU]

Press the
UNIT simultaneously. Then ent er the SERVICE MENU mode as shown in Fig.1.

DISPLAY

････････････

key and the

Adjustment of the IF circuits.
Adjustment of the VIDEO/CHROMA circuit.
Adjustment of the initial setting values of VSM condition as STANDARD, SOFT and BRIGHT.
(VSM : Video Status Memory)

SERVICE MENU

PICTURE MODE

key of the REMOTE CONTROL

SERVICE MENU

[Exit from SERVICE MENU]

When complete the adjustment work, press the
SERVICE MENU.
And then press the

[Select from SER VICE M ENU]

In SERVICE MENU, press the number (1～3) key of the remote control unit, to select

any of the adjustment items.

[Method of setting]

1. IF

[1. VCO]

1 Key

①

1 Key

②

The VCO (CW ) screen will be displayed a allow mark when

③

the AFC voltage is at a certain level.

DISPLAY Key

④

will return to the

[2. DELAY POINT]

1 Key

①

2 Key

②

MENU -/+

③

DISPLAY Key

④

will return to the

DISPLAY

･･････････････････
･･････････････････

･･････････････････
･･････････････････

･･････････････

key again, return to the nor mal screen.

Select

1.IF

Select

1.VCO

･･････････

･･････････

When this is pressed twic e, you

Select

1.IF

Select

2.DELAY POINT

Set (adjust) the setting values

of the setting items.

When this is pressed twic e, you

DISPLAY

.

SERVICE MENU

.

SERVICE MENU

key to return to the

.

.

.

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

1.IF 2.V/C

3.VSM PRESET

1-3 SELECT DISP : EXIT

******

***********

***** **

************

**********

*** ** **

*** ** **** ***

*** ** ***** ** **

** ***

** ***** ***

Fig.1

**.***

***

****

******

and

2.V/C

①

3. VSM PRESET

②
③

setting items.

④

the

18

3.VSM PRESET

2,3Key

･････････････････

MENU ▼/▲ Key

MENU -/+

DISPLAY Key

･･････････････

･･･････････

･･･････

Select one from

Select s etting items.

Adj us t t he s etting valu es of the

When this is press ed, return to

SERVICE MENU

2. V/C

.

and

.

No. 51902

A

A

A

A

SERVICE MENU FLOW CHART

V-21D81
V-20N81
V-16N81

V-16N81G

SERVICE MENU

SERVICE MENU

1.IF 2.V/C

3.VSM PRESET

1-3 SELECT DISP : EXIT

******

***********

***** **

************

**********

*** ** **

*** ** **** ***

*** ** ***** ** **

**.***

****

** ***

** ***** ***

***

******

SUB MENU 1. IF

IF

1. VCO

2. DELAY POINT

1-2 : SELECT DISP : EXIT

SUB MENU 2. V/C

V/C PAL

1. CUTOFF

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

(R)
(G)
(B)

***.*

VCO (CW)

TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW

DELAY POINT UHF

AGC TAKE-OVER

- / + : OPERATE DISP : EXIT

*

MHz

DISP : EXIT

*

*

Setting item

1. CUTOFF

2. DRIVE

* *

*

* *

*

* *

*

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT

7. BLACK OFFSET

8. SHARP

9. TEXT(RGB)CONT.

10. H CENTER

11. V HEIGHT

12. V LIN

13. V. S-CR

14. V CENTER

15. AMP T. SHAR P

(R/G/B)

(R/B)

(P/S/N)

(TV/VI DEO)

(R-Y/B-Y)

(TV/VIDEO)

SUB MENU 3. VSM PRESET

BRIGHT / STD / SOFT

BRIGHT

TINT
COLOUR
BRIGHT
CONT.
SHARP

/ :SELECT

- / + : OPERATE DISP : EXIT

*

*

*

*

*

*

*

*

*

*

SUB VSM

Setting item

TINT

COLOUR

BRIGHT

CONT.

SHARP

No. 51902

19

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

ADJUSTMENT LOCATIONS

TOP

POWER

SW

CRT SOCKET PWB

TP-47G

MAIN PWB

F901

(SOLDER SIDE)

U

TP-47B

TP-E

E1

T

CRT EARTH WIRE
(BRAIDED ASS'Y)

A/V INPUT

FRONT

IC701

DEG

PW

S

TU001

ANT. Terminal

A/V IN&OUTPUT Terminal

IC702

MEMORY IC

IC201

VCO(CW)

T

T101

1Pin TP-91(B1)
2Pin NC
3Pin X-ray1
4Pin X-ray2
5Pin TP-E( )

1

S

HV

U

HVT

UPPER:FOCUS
LOWER:SCREEN

20

No. 51902

A

A

A

A

ADJUSTMENTS

B1 POWER SUPPLY

V-21D81
V-20N81
V-16N81

V-16N81G

Item

Check of
B1 Power

Measurin g
instrument

Signal
generator

Supply

DC Volt­meter

FOCUS ADJUSTMENT

Item

Adju stment
of FOCUS

Measurin g
instrument

Signal
generator

IF CIRCUIT ADJUSTMENT

Item

Measurin g
instrument

Test point Adjustment part Description

TP-91 (B1)

TP-E (

)



1. Input a whole black signal.

2. Connect a DC voltmeter to TP-91(B1) and TP-E ().

3. Make sure that the voltage is DC114.5±1.5V.

Test point Adjustment part Description

FOCUS VR

[In HVT]

1. Input a cross-hatch signal.

2. While watching the screen, adjust the FOCUS VR to make the

vertical and horizontal lines as fine and sharp as possible.

3. Make sure t hat when the screen is darkened, the lines r emain in

good focus.

Test point Adjustment part Description

Adju stment
of VCO(CW)

VCO (CW)

TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW

ADJUSTM ENT AT THI S POINT IS USEL ESS

Signal
Generator

Remote
control unit

V

L

V

L:*****

VLV

L

DISP : EXIT

ADJUSTMENT POI NT

1. VCO
T101

(VCO.TRANSF.)

YELLOW

TOO HIGH

ABOVE REFERENCE

JUST REFERENCE

BELOW REFERENCE

TOO LOW

Please use signal generator which is correct proof about the

●

sending frequency.

1. Input the PAL full c olour bar (210.25MHz) signal.

2. Select 1.IF from the

SERVICE MENU

3. Press 1 key and select

4. T urn the c or e of

VCO (CW) TRANSF. (T101)

1.VCO

.

.

on PW BOARD

5. until the c olour of the characters “TOO HIGH” displayed on the
screen changes from blue to

yellow

.

6. Then slowly turn the core of VCO (CW ) TRANSF.(T101)
counter-clockwise until the colour of the characters “ABOV E
REFERENCE” changes from blue to

yellow

.

7. Further slowly turn the c ore of VCO(CW ) TRANSF.(T101) until
the colour of the characters “BELOW REFERENCE” changes
from blue to

yellow

.

8. Press the DISPLAY key three times to return to normal screen.

No. 51902

21

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

Item

Adju stment

of DELAY

POINT

(AGC)

Measurin g

instrument

Signal
generator

Remote
control unit

DELAY POINT UHF

AGC TAKE-OVER

- / + : OPERATE DISP : EXIT

Test point Adjustment part Description

*

DELAY POINT

(AGC TAKE-OVER)

*

1. Input a black and white signal (colour off).

2. Select

3. Select

control unit.

4. Set the setting values of the setting items as shown bellow table.

5. Then adjust the MENU - or + key until video nois e disappears.

6. Turn to other channels and make sure that there are no

irregularities.

from the SERVICE MENU.

1. IF

2. DELAY POINT

by pressing the 2 key on the remote

Setting Item Variable range Initial setting value

DELAY POINT

(AGC TAKE OVER)

0～127

20

22

No. 51902

A

A

A

A

VIDEO / CHROMA CIRCUIT ADJUSTMENT

The setting (adjustment) using the REMOTE CONTROL UNIT is made on the basis of the initial setting values.

The setting values which adju st the screen to the optimum condition can be different from the initial setting values.

Do not change the initial setting values of the setting items not listed in “ADJUSTMENT”.

V-21D81
V-20N81
V-16N81

V-16N81G

Item

Adju stment

of WHITE

BALANCE

(Low light)

Measurin g
instrument

Test point Adjustment part Description

Signal
generator

Remote
control unit

V/C PAL

* *

1. CUTOFF

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

(R)
(G)
(B)

*

* *

*

* *

*

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

CUTOFF OFF

(H.LINE OFF)

CUTOFF ON

(H.LINE ON)

R. CUTOFF( )

R. CUTOFF( )

▲

R. DRIVE( )

▲

▼

R. DRIVE( )

▼

123

4

7

R

56

8

9

GB

1. CUT OFF (R)

CUT OFF (G)

CUT OFF (B)

SCREEN VR

[IN HVT]

G.CUTOFF( )

B. CUTOFF( )

B. DRIVE( )

B. CUTOFF( )

B. DRIVE( )

G.CUTOFF( )

▲

▲

▲

▲

▲

▲

1. Input a black and white signal (colour off).

2. Select

(R), (G) and (B) .

OFF

from the SERVICE MENU, then select

2. V/C

1. CUT

3. Set each value to initial setting value with 4～9 keys of the

remote c ontrol unit.

4. Press the

key of the remote control unit to show the single

1

horizontal line on scr een.

5. Turn the

SCREEN VR

fully counter-clockwise, then slowly turn it

clockwis e to where one of a red, blue or green colour is faintly

visible.

6. Use keys

of the remote c ontrol unit and adjust the other 2

4～9

colours which except the appeared c olour to where the single

horizontal line appears white.

7. Turn the

SCREEN VR

to where the single horizontal line glows

faintly.

8. Press the

9. Press the

1. CUT OFF

key to turn off the single horizontal line.

2

DISPLAY

Adjustment item

key twice to return to the normal screen.

Variable

range

-128～+127

R

-128～+127

G

-128～+127

B

Initial setting

value

+00

+00

+00

Adju stment

of WHITE

BALANCE

(High light)

Signal
generator

Remote
control unit

2. DRIVE (R

DRIVE (B)

)

1. Input a black and white signal (colour off).

2. Select

0. Select

from the SERVICE MENU.

2. V/C

2. DRIVE (R) / (B)

with MENU ▼/▲ key, and set each

value to initial setting value with 4 and 7 or 6 and 9 keys of the

remote c ontrol unit.

4. Use the keys

and 7 or 6 and 9 to produce a white screen

4

5. Press the DISPLAY key twice to return to the nomal screen.

V/C PAL

* *

*

2. DRIVE

50Hz

/ :SELECT

- / + : OPERATE DISP : EXIT

(R)
(B)

* *

*

No. 51902

Adjustment item

2. DRIVE

R

B

Variable

range

-128～+127

-128～+127

Initial setting

value

+00

+00

23

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

Item

Adju stment

of

SUB BRIGHT

Adju stment

of

SUB CONT.

Adju stment

of

SUB
COLOUR

ⅠⅠⅠⅠ

Measurin g

instrument

Remote
control unit

Remote
control unit

Remote
control unit

Test point Adjustment part Description

3. BRIGHT

4. CONT.

5. COLOUR [Method of adjustment without measuring instrument]

PAL COLOUR

1. Receive any broadc ast.

2. Select

3. Select

4. Set the initial setting value with the MENU - or + key.

5. If the brightness is not the best with the initial set value, make

fine adjustment until you get the best brightness.

1. Receive any broadc ast.

2. Select

0. Select

4. Set the initial setting value with the MENU - or + key.

5. If the contrast is not the best with the initial set value, make fine

adjustment until you get the best contrast.

1. Receive a PAL broadcast.

2. Select

3. Select

4. Set the initial setting value for PAL COLOUR with the MENU

- or + key.

5. If the colour is not the best with the initial set value, make fine

adjustment until you get the best colour.

from SERVICE MENU.

2. V/C

3. BRIGHT

2. V/C

4. CONT

2. V/C

5. COLOUR

with the MENU ▼/▲key.

from SERVICE MENU.

. with the MENU ▼/▲key.

from the SERVICE MENU.

with the MENU ▼/▲ key.

24

SECAM COLOUR

NTSC 3.58 COLOUR

NTSC 4.43 COLOUR

No. 51902

1. Receive a SECAM broadc ast.

2. Make fine adjustment of SECAM COLOUR as previously.

1. Receive a NTSC 3.58MHz broadc ast.

2. Make similar fine adjustment of NTSC 3.58 COLOUR as

previously.

When NTSC 3.58 adjustment completed, NT SC 4.43 will be

automatically set at the respective values.

A

V-21D81

A

A

A

V-20N81
V-16N81

V-16N81G

Item

Adju stment

of SUB
COLOUR

ⅡⅡⅡⅡ

Measurin g

instrument

Signal
generator

Oscillo­scope

Remote
control unit

Test point Adjustment part Description

TP-47G

TP-E (



[CRT SOCKET
PWB]

5. COLOUR [Method of adjustment using measuring instrument]

)

PAL COLOUR

1. Input a PAL full field colour bar signal (75% white).

2. Select

3. Select

from SERVICE MENU.

2. V/C

5. COLOUR

with the MENU ▼/▲ key.

4. Set the initial setting value of PAL COLOUR with the MENU

- or + key.

5. Connect the oscillosc ope between TP-47G and TP-E ().

6. Adjust PAL COLOUR to bring the value of

to the values as shown given billow.

(Voltage difference between (W) and (G))

Model Voltage(W-G)

AV-21D81

AV-20N81

AV-16N81

AV-16N81G

/VT

/VT

/VT

/VT

in the illustration

(A)

+5V

+7V

+7V

+7V

SECAM COLOUR

NTSC 3.58 COLOUR

1. Input a SECAM full field colour bar signal (75% white).

2. Set the initial setting value of SECAM COLOUR with the MENU

- or + key.

3. Adjust SECAM COLOUR to bring the value of

(A)

in the

illustration to the values as shown given billow.

Voltage difference between (W) and (G))

Model Voltage(W-G)

AV-21D81

AV-20N81

AV-16N81

AV-16N81G

/VT

/VT

/VT

/VT

+7V

+10V

+13V

+13V

1. Input a NTSC 3.58 full field colour bar signal (75% white).

2. Set the initial setting value of NTSC 3.58 COLOUR with t he

MENU - or + key.

3. Adjust NTSC 3.58 COLOUR to bring the value of

(A)

in the

illustration to the values as shown given billow.

(Voltage difference between (W) and (G))

Model Voltage(W-G)

AV-21D81

AV-20N81

AV-16N81

AV-16N81G

/VT

/VT

/VT

/VT

+5V

+7V

+8V

+8V

NTSC 4.43 COLOUR

When NTSC 3.58 is set, NTSC 4.43 will be automatic ally set at the

respective values.

No. 51902

25

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

Item

Adju stment
of TINT

ⅠⅠⅠⅠ

Adju stment
of TINT

ⅡⅡⅡⅡ

Measurin g

instrument

Signal
generator

Remote
control unit

Signal
generator

Oscillo­scope

Remote
control unit

Test point Adjustment part Description

6. TINT [Method of adjustment without measuring instrument]

1. Input a NTSC 3.58 full field colour bar signal (75% white).

2. Select

3. Select

4. Set the initial setting value of NTSC 3.58 with the MENU - or

+ key.

5. If you cannot get the best tint with the initial setting value, make

fine adjustment until you get the best tint.

When NTSC 3.58 is set, NTSC 4.43 will be automatic ally set at the

respective values.

1. Input a NTSC 3.58 full field colour bar signal (75% white).

2. Select

3. Select

4. Set the initial setting value of NTSC 3.58 with the MENU - or

+ key.

5. Connect the oscillosc ope between TP-47G and TP-E. ().

6. Adjust NTSC 3.58 TINT to bring the value of

illustration to the values as shown given billow.

(Voltage difference between (W) and (Cy))

from SERVICE MENU.

2. V/C

with the MENU ▼/▲ key.

6. TINT

from SERVICE MENU.

2. V/C

with the MENU ▼/▲ key.

6. TINT

TP-47G

TP-E (



[CRT
SOCKET
PWB]

NTSC 3.58 TINT

NTSC 4.43 TINT

6. TINT [Method of adjustment using measuring instrument]

)

NTSC 3.58 TINT

(B)

in the

NTSC 4.43 TINT

Model Voltage(W-G)

AV-21D81

AV-20N81

AV-16N81

AV-16N81G

When NTSC 3.58 is set, NTSC 4.43 will be automatic ally set at the

respective values.

/VT

/VT

/VT

/VT

+5V

+7V

+8V

+8V

26

No. 51902

A

V-21D81

A

A

A

(

)

)

)

)

V-20N81
V-16N81

V-16N81G

Item

Adju stment
of BLACK
OFFSET

(SECAM)

of BLACK
OFFSET

(SECAM)

ⅠⅠⅠⅠ

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

123

4

789

ⅡⅡⅡⅡ

[R-Y]

Measurin g

instrument

Remote
control unit

56

Signal
generator

Oscilloscope

Remote

control unit

Test point Adjustment part Description

BLACK OFFSET ON

BLACK OFFSET OFF

35 PIN (R-Y)
36 PIN (B-Y)
IC-301 ON
MAIN PWB

(a) (b)

7. BLACK
OFFSET

R-Y (

B-Y (

R-Y

B-Y (

▲

▲

7. BLACK
OFFSET

(R-Y)

(B-Y)

▲

▲

(R-Y)

(B-Y)

***

***

***

***

[Method of adjustment without measuring instrument]

1. Receive a SECAM broadcast.

2. Select 2. V/C from SERVICE MENU.

3. Select 7. BLACK OFFSET with the FUNCTION UP/DOWN key.

4. Set the initial setting value for BLACK OFFSET (R-Y) and (B-Y)

with

and 7 or 6 and 9 keys of the remote c ontrol.

4

5. If the picture is not the best with the initial setting value,
makefine adjustment until you get the best picture.

6. Press the MENU key and memorize the setting value.

[Method of adjustment using measuring instrument]Adju stment

1. Receive a SECAM COLOUR bar s ignal (full field c olour bar
75% white).

2. Select 2. V/C from SERVICE MENU.

3. Select 7. BLACK OFFSET with the FUNCTION UP/DOWN key.

4. Connect the oscilloscope between

().

5. By using

OFFSET (R-Y) so that it bec omes the waveform changes from
(a) to (b) shown in the figure.

6. Connect the oscilloscope between

7. By using

OFFSET (B-Y) s o that it becomes the waveform changes from
(c) to (d) shown in the figure.

8. If the picture is not the best with the adjusted picture, make fine
adjustment until you get the best picture.

9. Press the MENU key and memorize the setting value.

and 7 keys of the remote control, adjust the BLACK

4

and 9 keys of the remote control, adjust the BLACK

6

pin of IC-301 and TP-E

35

pin of IC-301 and TP-E.

36

[B-Y]

(c) (d)

No. 51902

27

A

V-21D81

A

A

A

g

V-20N81
V-16N81
V-16N81G

Item

Adju stment

of

V HEIG HT



Screen

size

92%

Measurin g

instrument

Signal
generator

Remote
control unit

Picture size 100%

Test point Adjustment part Description

1. Input a circle pattern signal.

2. Select

3. Select

4. Set the initial setting value with the MENU - / + key.

5. As shown in F ig.1, adjust
screen size

remote c ontrol unit.

from SERVICE MENU.

2.V/ C.

11.V HEIGHT

of the picture size with the MENU - / + keys of

92%

with the MENU ▼/▲ key.

Screen size

Fi

.1

11. V HEIGHT

Picture
size
100%

V HEIGHT

and make the vertic al

Adju stment

of



H CENTER

Signal
generator

Remote
control unit

HH'

Fig.2

10. H CE NTER

6. Input a circle pattern signal.

7. Select

8. Set the initial setting value of

9. Adjust

10. H CENTER

/ + key.

10. H CENTER

the MENU - / + key.

with the MENU ▼/▲ key.

to make

10. H CE NTER

as shown in Fig.2 with

H=H’

with the MENU -

28

No. 51902

A

V-21D81

A

A

A

V-20N81
V-16N81

V-16N81G

Item

Adju stment

of V LIN. &

V. S-CR

Measurin g

instrument

Signal
generator

Remote
control unit

Fig.3

Test point Adjustment part Description

When the vertical linearity has been deteriorated

12. V LI N.

13. V. S-CR

TOP

CENTER

BOTTOM

●●●●

remarkably, perform the following steps.

10. Input a cross-hatch signal.

11. Select

12. Set the initial s etting value of

13. Select

14. Set the initial s etting value of

15. Adjust

.

Make sur e that the adjustment is properly done on the screen of

60Hz mode.

[NOTE]

z

z

z

12. V LIN.

key.

13. V. S-CR

key.

12. V LIN.

line as shown in Fig.3 on

become uniform.

Adjust t o make both 50Hz & 60Hz are the same v. size and

fine straight line.

When adjust again, adjust 50Hz mode first.

When adjust in 60Hz mode, only 60H z mode is adjust.

with the MENU ▼/▲ key.

12. V LIN.

with the MENU ▼/▲ key.

13. V. S-CR

and

13. V. S-CR

TOP, CENTER

with the MENU - / +

with the MENU - / +

so that the spaces of each

and

BOTTOM

VSM PRESET SETTING

Item

Setting of

VSM

PRESET

Measurin g

instrument

Remote

control unit

BRIGHT

TINT
COLOUR
BRIGHT
CONT.
SHARP

/ :SELECT

- / + : OPERATE DISP : EXIT

Test point Adjustment part Description

TINT

COLOUR

BRIGHT

CONT.

SHARP

VSM PRESET

xxxx

VSM

*

*

*

*

*

*

*

*

*

*

Setting Item

TINT +15

COLOUR +15

BRIGHT +15

CONT +30

SHARP +15

1. Select

2. Select BRIGHT with the PICTURE MODE key.

3. Adjust the MENU ▼/▲ and MENU - or + key to bring the set

4. Respectively select the VSM PRESET mode for SOFT and

3. VSM PRESET

val ues of

table.

STANDARD, and make similar adjustment as in 3 above.

TINT

BRIGHT STANDARD SOFT

from the SERVICE MENU.

SHARP

～～～～

to the values shown in the below

←
←←
←←

+19(AV-21D81)
+19(AV-20N81)
+24(AV-16N81)

+24(AV-16N81G)

←

←

+11(AV-21D81)
+11(AV-20N81)
+17(AV-16N81)

+17(AV-16N81G)

+12(AV-21D81)
+12(AV-20N81)
+10(AV-16N81)

+10(AV-16N81G)

No. 51902

29

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

PURITY / CONVERGENCE ADJUSTMENT

PURITY ADJUSTMENT

1. Demagnetize CRT with the demagnetizer.

2. Loosen the retainer screw of the deflection yoke.

3. Remove the wedges.

4. Input a green raster signal from the signal generator, and turn
the screen to green raster.

5. Move the deflection yoke backward.

6. Bring the long lug of the pur ity magnets on the short lug and
position them horizontally. (Fig.2)

7. Adjust the gap between two lugs so that the GREEN RASTER
will come into the cent er of the screen. (Fig.3)

8. Move the deflection yoke forward, and fix the position of the
deflection yoke so that the whole screen will become green.

9. Insert the wedge to the top side of the deflection yoke so that it
will not move.

CRT

WEDGE

P : PURITY MAGNET
4 : 4 POLES
6 : 6 POLES

Fig.1

PURITY MAGNETS

DEFLECTION

YOKE

P

46

P / C

MAGNETS

P/C MAGNETS

y

(convergence magnets)
(convergence magnets)

10. Input a crosshatch signal.

11. Verify that the screen is horizontal.

12. Input red and blue raster signals, and make sure that purity is
properly adjusted.

Long lug

Short lug

(FRONT VIEW )

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

Fig.2

GREEN RASTER

CENTER

Fig.3

30

No. 51902

A

A

A

A

STATIC CONVERGENCE ADJUSTMENT

1. Input a crosshatch signal.

2. Using 4-pole convergenc e magnets, overlap the red and blue
lines in the center of the screen (Fig.1) and turn them to
magenta (red/blue).

3. Using 6-pole convergence magnets, overlap the
magenta(red/blue) and green lines in the center of the screen
and turn them to white.

4. Repeat 2 and 3 above, and make best convergence.

DYNAMIC CONVERGENCE ADJUSTMENT

1. Move the deflection yoke up and down and overlap the lines in
the periphery. (Fig. 2)

2. Move the deflection yoke left to right and overlap the lines in the
periphery. (Fig. 3)

3. Repeat 1 and 2 above, and make best convergence.

(FRONT VIEW )

(FRONT VIEW )

BLUE

GREEN

RED

RED

Fig.1

GREEN

V-21D81
V-20N81
V-16N81

V-16N81G

BLUE

RED

GREEN

BLUE

After adjustment, fix the wedge at the original position.

●

Fast en the r etainer screw of the deflection yoke.
Fix the 6 magnets with glue.

(FRONT VIEW )

GREEN

RED

BLUE

BLUE

GREEN RED

Fig.2

BLUE

Fig.3

GREEN

RED

RED
GREEN
BLUE

BLUE
GREEN
RED

No. 51902

31

A

V-21D81

A

A

A

V-20N81
V-16N81
V-16N81G

SELF CHECK FUNCTIONS

1. Outline

This model has self check functions given below. When an abnormality has been detected, the SUB POW ER is turned off and the LED
flashes to inf orm of the failure. An abnormality is detected by the signal input state of the c ontrol line connected t o the microcomputer.

2. Self check items

Check item Details of detection Method of detection State of abnormality

Over-current protection An over-current on the LOW B

line is detected.

The main microcomputer
detects the possible abnormality
at 30-msec. intervals and judges
the results in every 16 time. Of
the 16 times, if NG is detected
more than 9 times, it is judged
that there is an abnormality

When an abnormality has been
detected, the SUB-POWER is
turned off. While the SUB­POWER is being turned off, the
power key of the remote
controller is not operational until
the power code is taken out and
put in again.

CRT NECK protection Operation of Vertical deflection

circuit.

X-ray protection Operation of X-ray pr otection

circuit

3. Self check i ndicating function

At about 3 seconds after the power is turned on, the self-check

function starts.
In the case where an abnormalit y has been detected within the
subsequent 2 seconds, the LED flashes, but the SUB-POW ER
is not turned off.

When an abnormality has been detected at about 5 seconds

after the power is turned on, the SUB POW ER is turned off

immediately and the LED flashes.

[ Indication by LED ]

Item LED flashing intervals Priority of detection

Over-current pr otection Quikly (at about 0.25sec.) intervals 1

①

Power on

DITTO DITTO

DITTO DITTO

After about
3 sec.

Start of
detection

Detection of
an
abnormality

After about
5 sec.

SUB­POW ER
OFF

Flashing LED

CRT NECK protection / X-ray protection

②

Note : In case of ① + ②, the item ① is indic ated

[NOTE]

There are some different types of models with and without X-RAY PROTECTION.

X-RAY :
LED :

There are some kinds of LEDs. In the models equipped wit h LEDs flash (turn on and off) simultaneously. In the models with one

of the above LEDs, the LED flashes.

32

Slowly (at about 0.5s ec.) intervals 2

No. 51902

VICTOR COMP ANY OF J APAN, LIMITED

HOME AV NETWORK BUSINESS UNIT 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama, Kanagawa-prefecture, 221-8528, Japan

4

AV21D81VT-CK #3 AV20N81VT-CK #3

AV16N81VT-CK #3 AV16N81GVTCK #999

VP 0112
DP7058