JVC AV-21D41/BK, AV-21D71/VT Service Manual

A

A

SERVICE MANUAL

COLOUR TELEVISION

V-21D41
V-21D71

BASIC CHASSIS

[RM-C368]

AV-21D41
AV-21D71

[AV-21D41

/BK

/VT

/BK

]

CG

CONTENTS

SPECIFICATIONS



SAFETY PRECAUTIONS



FEATURES



MAIN DIFFERENCE LIST



FUNCTIONS



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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･･･････････････････････

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

･･･････････････････････

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･･･

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14
31

2-1

2
3
4
4
5
6

No. 51925

Dec. 2001

A

V-21D41

A

V-21D71

SPECIFICATIONS

ITEM

Dimensions(W×H×D)

Mass

TV RF System

Colour System

Picture Tube

High Voltage

Receiving Frequency

Intermediate
Frequency

CONTENT

AV-21D41

598mm×468mm×478mm

21kg

B/G, I, D/K B/G, I, D/K,M

RF Mode PAL / SECAM PAL / SECAM / NTSC3.58 / NTSC4.43

VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43

Visible size: 51cm measured diagonally

26.5kV±1.5kV(at zero beam current)

VHF (VL) 46.25MHz～168.25MHz

VHF (VH) 175.25MHz～463.25MHz

UHF 471.25MHz～863.25MHz

Cable TVs of Mid (X-Z, S1-S10)

CATV

VIF Carrier 38.0MHz

SIF Carrier

Super (S11-S20) & Hyper (S21-S41)
bands receivable

32.5MHz(5.5MHz)

31.5MHz (6.5MHz)

32.0MHz (6.0MHz)

/BK

32.5MHz(5.5MHz) / 33.5MHz (4.5MHz)

31.5MHz (6.5MHz)

32.0MHz (6.0MHz)

AV-21D71

/VT

Colour Sub Carrier Frequency

Power Input

Power Consumption

Speaker

Audio Output

Aerial Input Terminal

Input

Output

Headphone jack

Remote Control Unit

Rated Voltage AC110～240V, 50 / 60Hz

Video 1V(p-p), 75Ω (Front / Rear)

Audio

Video 1V(p-p), 75

Audio 500mV(rms) (-4dBs), Low impedance,

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

105W (Max) 68W(Avg)

5cm×12 cm, Oval type×2

5W (monaural), Bilingual 5W (monaural)

75Ω Unbalanced

500mV(rms) (-4dBs), High impedance,
RCA×2 (Front / Rear)

Ω

3.5mm mini jack

RM-C368
(Battery size : AA / R06 / UM-3×2)

RM-C367
(Battery size : AA / R06 / UM-3×2)

Design and specifications are subject to change without notice.

2

No. 51925

A

A

SAFETY PRECAUTIONS

V-21D41
V-21D71

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 electrical 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 (

The us e of a substitute replacement which does not

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.

) 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.51925

3

A

V-21D41

A

V-21D71

FEATURES

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

z

Wide range voltage (110V～240V) 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

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 / of contrast of the picture can be adjusted automatically to make the
optimum picture which is easy on the eye.

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

z

Built–in PICTURE BOOSTER circ uit newly, to amplif y the broadcasting wave in the area where wave is weak.

z

2

C bus control utilizes single chip ICs for IF, V/C, DEF. VSM PRESET, PRESET & TURBO TIMER.

I

z

SYSTEM BLOCK DIAGRAM

IC702

MEMORY

SCL2/SDA2

IC701

MICRO

COMPUTER

IC301

VIDEO/CHROMA

DECORDER

SCL1/SDA1

MAIN DIFFERENCE LIST







PARTS NAME AV-21D41/BK AV-21D71/VT

MAIN PW BOARD SCG-1303A-BK SCG-1304A-CK

POWER CORD QMPR010-200-E2 QMP40D0-200J5

FRONT CABINET LC11129- 006A-H LC11129- 009A-HK

TU001

TUNER

PICTURE TUBE A51LMV20X A51JSW51X07



DEG COIL QQW0006-001 CELD029-004J6(inc.DY)



DEF YOKE CE20336-00A



REAR COVER GG10130-005A-H GG10130-005A-HK



INST BOOK LCT1031- 001A-H LCT1032-001A



4

No. 51925

×

A

A

FUNCTIONS

■■■■

FRONT CONTROL

①

②

[AV-21D71/VT]

①③

②

④⑤

⑥⑦

⑧⑨ ⑩

HEADPHONE jack

①

VIDEO/AUDIO INPUT terminal

②

MENU buttons

③

CHANNEL －/＋ buttons

④

VOLUME －/＋ buttons

⑤

ECO sensor

⑥

REMOTE CONTROL sensor

⑦

ON TIMER lamp

⑧

POWER lamp

⑨

MAIN POWER button

⑩

V-21D41
V-21D71

■■■■

REAR TERMINAL

①

■■■■

REMOTE CONTROL UNIT

①
②

③

④
⑤

⑥

⑦

⑧

⑨
⑯

⑩

⑱

⑪
⑫

⑬

⑭

⑮

⑰

[RM-C368GY]

②
④

⑤

③

ANT Terminal

①

VIDEO INPUT Terminal

②

VIDEO OUTPUT Terminal

③

AUDIO INPUT Terminal

④

AUDIO OUTPUT Terminal

⑤

ECO SENSOR key

①

COLOUR SYSTEM key

②

SOUND SYSTEM key

③

TV/VIDEO key

④

Key

⑤ Ⅰ/Ⅱ

[Only for AV-21D41/BK(RM-C368)]

OFF TIMER key

⑥

CHANNEL SCAN key

⑦

RETURN＋key

⑧

DISPLAY key

⑨

CHANNEL key

⑩

POWER key

⑪

PICTURE MODE key

⑫

Number (CH.) key

⑬

⑭ －/－－

MUTING key

⑮

MENU key

⑯

MENU ▲/▼ key

MENU －/＋ key

VOLUME－/＋ key

⑰

PICTURE BOOSTER

⑱

[AV-21D41/VT(RM-C368) ONLY]

key

No. 51925

5

A

V-21D41

A

V-21D71

SPECIFIC SERVICE INSTRUCTIONS

DISASSEMBLY PROCEDURE

REMOVING THE REAR COVER

1. Unplug the power plug.

2. As shown in figure, remove the

marked

3. Withdraw the rear cover t oward you.

.

B

REMOVING THE MAIN PW BOARD

After removing the rear cover.

z

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

2. Withdraw the MAIN 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 same steps when removing the other hand speaker.

screws marked A and a screw

7

screws marked C.

4

CHECKING THE MAIN PW BOARD

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

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

2) Erect the PW Board vertic ally so that you can easily check 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 cable tie used for tying the wires together.
Should it be inadvertently removed, be sure to tie the wires with a
new cable tie.

6

No. 51925

A

A

FRONT CABINET

V-21D41
V-21D71

This exploded view described about AV­21D41/BK. Although AV-21D71/VT is slightly
different from this illustration, when if you
disassemble the AV-21D71/VT, you can do it

as same as this illustration.

C

SPEAKER

CRT SOCKET PWB

MAIN PWB

SPEAKER

C

REAR COVER

POWER CORD

B

A

No. 51925

7

A

V-21D41

A

y

V-21D71

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 outlet.

(2) Replace ICs

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

(3) Power on

Connect the power plug to the 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) W hile the SERVICE MENU is displayed, again press the

PICTURE MODE

screen of Fig. 2 will be displayed.

4) Check the setting values of the SYSTEM CONSTANT SET of Table 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 of T able 3, and reset where

necessary.

For setting, refer to the

key and the

PICTURE MODE

key of the REMOTE

DISPLAY

key simultaneously, then the SYSTE M CONST ANT 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.DEF 4.VSM PRESET

5.PRESET

6.TURBO TIMER OFF

1-6 SELECT DISP : EXIT

******

***********

***** **

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

**********

*** ** **

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

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

**.***

****

** ***

** ***** ***

***

******

Fig.1

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 1

COLOUR :
BILINGUAL :
TUNER : MU
ECO SENSOR : YES
LANGUAGE :

: SELECT

/

- / + : OPERATE DISP : EXIT

*****

*****

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

****

********

****

****

********

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 2

B/B SOUND : OFF
LOCK : 180
COLOUR AUTO : NO
QSS : MINT
ALC : NO
TEXT RATE : 20

: SELECT

/

- / + : OPERATE DISP : EXIT

ⅠⅠⅠⅠ

ⅡⅡⅡⅡ

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

AV-21D41/BK

ONLY

PICTURE

MODE ke y

NUMBERS ke

SYSTEM CONSTANT-

SYSTEM CONSTANT SET 3

AMP TUNER : YES
VNR : NO
TEXT TABLE : CYL

: SELECT

/

- / + : OPERATE DISP : EXIT

ⅢⅢⅢⅢ

Fig.2

DISPLAY key

MENU

key

－/＋

MENU

▼/▲

key

[RM-C368]

8

No. 51925

A

A

SETTING OF SYSTEM CONSTANT SET

A

V-21D41
V-21D71

Setting item Setting contents

COLOUR

BILINGUAL

TUNER

ECO SENSOR

LANGUAGE

B/B SOUND

LOCK

COLOUR AUTO

QSS

ALC

TEXT RATE

AMP TUNER

VNR

TEXT TABLE

MULTI.

YES NO

MA

MU

YES NO

AV-21D41/BK AV-21D71/VT

E/T

YES 10

E

ON OFF

240 250

～

YES NO

MINT MQSS

YES NO

10 20 40 80

YES

YES

RA CYL

NO

NO

PALTRIPLE

E/V

AV-21D41/BK AV-21D71/VT

TRIPLE MULTI

YES

MU

YES

E

E/T

OFF

180

NO

MINT

NO

20

YES

NO

CYL

NO

MU

YES

E/V

OFF

180

NO

MINT

NO

20

YES

NO

CYL

Table 1

USER SETTING VALUES

Setting item Setting value Setting item Setting value

MAIN POWER SW OFF PICTURE MODE (VSM) BRIGHT

THAI

SUB POWER ON LANGUAGE

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

BILINGUAL MODE

OFF TIMER OFF ( show : 00 ) PICTURE BOOSTER OFF

About 10 ECO SENSOR OFF

TV VNR OFF

[AV-21D41/BK only]

Ⅰ

CHILD LOCK OFF

Table 2

VIET

[AV-21D71/VT]

[AV-21D41/BK]

No. 51925

9

A

V-21D41

A

V-21D71

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

2. DRIVE

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT

7. SECAM BL ADJ.

8. SHARP

(Do not adjust)

9. AMP T. SHARP

3. DEFLECTION

Setting item Variable range

1. VER. POSITION

2. HOR. POSITION

RED

GREEN1. CUT OFF

BLUE

RED

BLUE

TV

VIDEO(BK/VT)

TV

VIDEO

Variable

range

-128～+127

-128～+127

-127～+127

-63～+63

-63～+63

-63～+63

-31～+31

-32～+31

-32～+31

-04 ～ +03

-16 ～ +15

Initial setting value

PAL SECAM NTSC 3.58 NTSC 4.43

-50

+ 0

+ 0

+ 0

+ 0

+ 0

-7(Fixed)

+15(Fixed)

-12 -12 -12 -12

fv : 50Hz MODE fv : 60Hz MODE

- 1 - 3

+ 3 + 3

-50 -50 -50

+ 0+ 0+ 0

+ 0+ 0+ 0

+ 0+ 0+ 0

+ 0+ 0+ 0

+ 0 + 0

+ 8 + 0/+4

+ 0

-7(Fixed) -7(Fixed) -7(Fixed)

+15(Fixed) +15(Fixed) +15(Fixed)

Initial setting value

+ 0 + 0

3. VER. HEIG HT

4. VER. LINE ARIT Y

5. VER. SCURVE

6. HOR. VCO ADJUST

(Do not adjust)

4. VSM PRESET

VSM preset

VSM mode

Setting item

TINT

COLOUR

BRIGHT

AV-21D41/BK +30 +19 +14

CONT.

AV-21D71/VT +30 +15 +11

AV-21D41/BK +20 +20 +15

SHARP

AV-21D71/VT +15 +15 +12

10

-64 ～ +63

-32 ～ +31

-32 ～ +31

-63 ～ +62

BRIGHT STANDARD SOFT

+15 +15 +15

+15 +15 +15

+15 +15 +15

-35 + 1

+15 - 1

-32 + 0

+ 0 + 0

No. 51925

A

A

5. PRESET

The items in the following table, it is no requirement for adjustment.

If values had changed by the miss operation, set the initial setting values in the following table.

V-21D41
V-21D71

Colour System

1. C TRAP FIX

2. SHARP PEAK

3. ABL

4. GAMMA

5. Y. DELAY TIME

6. BLACK EXP START

7. C-BPF

8. CW / SCP

9. VIF DET LEVEL

11. IF AGC MIN

12. VIF AGC

13. VIF PMOD

(Do Not Adj ust)

Setting item

TV

VIDEO

TV

VIDEO

Initial setting value (Fixed value)

PAL SECAM NTSC 3.58 NTSC 4.43

111 1

000 0

111 1

000 0

022 3

020 2

3

＋

110 0

111 1

000 0

000 0

000 0

000 0

000 0

3

＋

3

＋

3

＋

19. VNR

20. RGB LIM

21. RGB LIMIT LEVEL

23. TEXT H. POSITION

24. READ DATA

Sound System

10. SIF DET LEVEL

14. SIF BPF BW ADJUST

15. SIF TRAP FO ADJUST

16. SIF TRAP FO ADJUST 2

17. SIF -TRAP

18. SIF -BPF

22. SIF SW

(Do Not Adj ust)

Setting i tem B/G I D/K M

15 15 15 15

111 1

222 2

-3 -3 -3 -3

0

＋

000 0

000 0

000 0

000 0

111 0

0

＋

00 1

0

＋

0

＋

No. 51925

11

A

V-21D41

A

V-21D71

REPLACEMENT OF IC301 (IF VIDEO/CHROMA DECODER)

For the IC301(IF V/C DECODER) of this model, all data are written in the micro-comput er. So, write the data in the micro­computer in accordance with the following procedures before starting adjustment.

REPLACING PROCEDURE S

Turn the power off.

(1)

Replace the IC301 with a new one.

(2)

While pressing

(3)

data is written in the micro-computer immediately.

LOCATIONS OF FRONT PANEL BUTTONS AND LAMPS

MENU

button and

button on the front cabinet simultaneously, turn the power on. When the power is turned on, the

VOL+

1

2 3

MENU buttons

①

CHANNEL －/＋ buttons

②

(MENU －/＋ buttons)

VOLUME －/＋ buttons

③

(MENU －/＋ buttons)

ECO sensor

④

REMOTE CONTROL sensor

⑤

ON TIMER lamp

⑥

POWER lamp

⑦

MAIN POWER button

⑧

4 5

[AV-21D71/VT]

7 8

6

12

No. 51925

A

A

REPLACEMENT OF CHIP COMPONENT

CAUTIONS



1. Avoid heating for more than 3 seconds.

2. Do not rub the electrodes and the resist parts of the pattern.

3. When removing a chip part, melt the s older adequately.

4. Do not reuse a chip part after removing it.

SOLDERING IRON



1. Use a high insulation soldering iron with a thin pointed end of it.

2. A 30w soldering iron is recommended f or easily removing parts.

REPLACEMENT STEPS



How to remove Chip parts

1.

Resistors, capacitors, etc.



(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

2. How to install Chip parts

Resistors, capacitors, etc.



(1) Apply solder to the pattern as indicated in the figure.

V-21D41
V-21D71

(2) Shift with tweezers and remove the chip part.

Transistors, diodes, variable resistors, et c.



(1) Apply extra s older to each lead.

SOLDER

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove
the chip part.

SOLDER

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the
chip part.

Transistors, diodes, variable resistors, et c.



(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead

A

C

(4) Then solder leads

as indicated in the figure.

A

B

and C.

B

A

B

Note : After removing the part, remove remaining solder fr om

thepattern.

No. 51925

C

13

A

V-21D41

A

V-21D71

SERVICE ADJUSTMENT

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 mode position

PICTURE MODE (VSM) BRIGHT

VNR OFF

COLOUR / BRIGHT
CONT. / SHARP

BLUE BACK OFF

OFF TIMER OFF

ECO SENSOR OFF

AUTO SHUT OFF OFF

CENTER

MEASURING INSTRUMENT AND FIXTURES

1. DC voltmeter (or digital voltmeter)

2. Oscill oscope

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

4. Remote contr ol unit

ADJUSTMENT ITEMS

Adjustment item

B1 POWER SUPPLY VIDEO/CHROMA circuit adjustment

FOCUS adjustment DEFLECTION. circuit adjustment

IF circuit adjustment VSM PRESET setting

PURITY / CONVERGENCE adjustment

[ For AV-21D41/ BK only ]

14

No. 51925

A

V-21D41

A

V-21D71

BASIC OPERATION OF SERVICE MENU

The adju stment using SERVICE MENU

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.DEF

･････････････････････

4.VSM PRESET

5.PRESET

6.TURBO TIMER

･････････････

･････････････････

････････････

Key operation of the SERVICE MENU

[Enter to SERVICE MENU]

Press the

DISPLAY

key and the

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

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

[Do not adjust]

.

For quick setting the TIMER count value, adjustable not only by minuets but also by second.

[Should be OFF]

PICTURE MODE

.

key of the REMOTE CONTROL

[Exit from SERVICE MENU]

When complete the adjustment work, press the

DISPLAY

key to return to the
SERVICE MENU.
And then press the

DISPLAY

key again, return to the nor mal screen.

[Select from SER VICE M ENU]

In SERVICE MENU, press the number (1～6) key of the remote control unit, to select

any of the adjustment items.

SERVICE MENU

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.TURBO TIMER OFF

1-6 SELECT DISP : EXIT

******

***********

***** **

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

**********

*** ** **

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

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

**.***

****

** ***

** ***** ***

***

******

AV-21D41/BK

ONLY

Fig.1

PICTURE

MODE ke y

NUMBERS key

DISPLAY key

MENU

key

－/＋

MENU

▼/▲

key

[RM-C368GY]

No. 51925

15

A

V-21D41

A

V-21D71

[Method of setting]

1. IF

[1. VCO]

1 Key

①

1 Key

②

The VCO (CW ) screen will be displayed a allow mark when the AFC voltage is at a certain level.

③

DISPLAY Key

④

[2. DELAY POINT]

1 Key

①

2 Key

②

MENU -/+

③

DISPLAY Key

④

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

･････････････････

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

･････････････････････

･････････････････

Select

Select

When this is pressed twice, you will return to the

Select

Select

Set (adjust) the setting values of the setting items.

When this is pressed twice, you will return to the

.

1.IF

1.VCO

.

1.IF

2.DELAY POINT

.

SERVICE MENU

SERVICE MENU

.

.

2.V/C, 3.DEF

2~4Key

①

MENU ▼/▲ Key

②

MENU -/+

③

DISPLAY Key

④

6.TURBO TIMER

By pressing the 6 key, you can change the ON or OFF (

①

and

4.VSM PRESET

･･･････････････････････

･･････････････

･････････････････････

･･････････････････

Select one from

Select s etting items.

Adj us t t he values of t he items .

When this is press ed, return to the

If it is ON, the timer in TIMER mode changes from 1 minute into 1 sec temporarily.
(It is easier to checks the Operation of TIMER)
If you turn the TV power off, this setting becomes OFF automatically.

2. V/C, 3. DEF

should be OFF

and

4. VSM PRESET

SERVICE MENU

).

.

.

16

No. 51925

A

A

SERVICE MENU FLOW CHART

V-21D41
V-21D71

SERVICE MENU

SERVICE MENU

1.IF 2.V/C

3.DEF 4.VSM PRESET

5.PRESET

6.TURBO TIMER O FF

1-6 SELECT DISP : EXIT

******

****** *****

***** **

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

**********

*** ** **

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

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

6.TURBO TIMER

** ***

** ***** ***

OFF

ON /

**.***

****

OFF

(By pressing 6-key)

***

******

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)

* *

* *

* *

SUB MENU 3. DEF

***.*

VCO (CW)

TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST
VCO ADJUST
FINE

DELAY POINT UHF

AGC TAKE-OVER

*
*
*

- / + : OPERATE DISP : EXIT

*

MHz

***(**)

***(**)

***(**)***(**
***(**)

***(**)

***(**)***(**

DISP : EXIT

*

*

)
)

DEF

1. VER. POSITION

50Hz

: SELECT

/

- / + : OPERATE DISP : EXIT

PAL

***

SUB MENU 4. VSM PRESET

BRIGHT

TINT
COLOUR
BRIGHT
CONT.
SHARP

: SELECT

/

- / + : OPERATE DISP : EXIT

*

*

*

*

*

*

*

*

*

*

SUB MENU 5. PRESET

PRESET

1. C-TRAP FIX

PAL

***

DO NOT AD JUST

50Hz

: SELECT

/

- / + : OPERATE DISP : EXIT

No. 51925

B/G

17

A

V-21D41

A

V-21D71

ADJUSTMENT LOCATIONS

MAIN PWB

POWER

SW

F901

CRT SOCKET PWB

TOP

TP-47G/R

TP-47R/G

U

IC701

TP-47B

(SOLDER SIDE)

T

TP-E

E1

A/V INPUT

IC702
MEMORY IC

CRT EARTH WIRE
(BRAIDED ASS'Y)

Headphone

FRONT

DEG

PW

S

TU001

ANTENA T erminal

VIDEO / AUDIO I/O T erminal

IC301

T

S1

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

HV

U

HVT

UPPER:FOCUS
LOWER:SCREEN

18

No. 51925

A

A

ADJUSTMENTS

B1 POWER SUPPLY

V-21D41
V-21D71

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)

Signal
generator

Remote
control unit

VCO (CW)

TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST
VCO ADJUST
FINE

DISP : EXIT

ADJUSTMENT AT THIS POINT IS USEL ESS

***.*

*

MHz

***(**)

***(**)

***(**)***(**
***(**)

***(**)

***(**)***(**

)
)

ADJUSTMENT POINT

1. VCO

YELLOW

Do no t adjust

TOO HIGH

ABOVE REFERENCE

JUST REFERENCE

BELOW REFERENCE

TOO LOW

Please us e the correct proofed signal generator about the
generating frequency.

1. Input the PAL full colour bar signal.

2. Select 1.IF from the

3. Press 1 key and select

4. Select

5. Press

VCO ADJUST

MENU

SERVICE MENU

1.VCO

with

MENU

-/+ key until the colour of the characters TOO

HIGH changes blue to yellow. Then gradually press the

.

.

▲/▼ key.

MENU

-/+ key until the TOO LOW changes yellow. At this time, confirm
that the value of

6. Select

7. Press

AFT ADJUST

MENU

VCO ADJUST

with

-/+ key until the characters JUST REFERENCE

is near +00.

MENU

▲/▼ key.

changes blue to yellow.

8. Press the

DISPLAY

key three times to return to normal screen.

No. 51925

19

A

V-21D41

A

V-21D71

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 t he setting items as shown bellow

table.

5. Then adjust the MENU - or + key until video noise dis appears.

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)

NTSC 3.58

OTHER

48

0～127

43

20

No. 51925

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 “ADJUSTM ENT”.

V-21D41
V-21D71

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

GB

1. CUT OFF (R)

G.CUTOFF( )

B. CUTOFF( )

B. DRIVE( )

9

B. CUTOFF( )

B. DRIVE( )

G.CUTOFF( )

CUT OFF (G)

CUT OFF (B)

SCREEN VR

[IN HVT]

▲

▲

▲

▲

▲

▲

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

-50

-50

-50

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

3. 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)

* *

*

Adjustment item

2. DRIVE

No. 51925

R

B

Variable

range

-128～+127

-128～+127

Initial setting

value

+0

+0

21

A

V-21D41

A

V-21D71

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

3. 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.

22

SECAM COLOUR

NTSC 3.58 COLOUR

NTSC 4.43 COLOUR

No. 51925

1. Receive a SECAM broadc ast.

2. Make fine adjustment of SECAM COLOUR as same step as

previously.

1. Receive a NTSC 3.58MHz broadc ast.

2. Make similar fine adjustment of NTSC 3.58 COLOUR as same

step as previously.

When NTSC 3.58 adjustment completed, NT SC 4.43 will be

automatically set at the respective values.

A

V-21D41

A

V-21D71

Item

Adju stment

of SUB
COLOUR

ⅡⅡⅡⅡ

W

Measurin g

instrument

Signal
generator

Oscillo­scope

Remote
control unit

Y

Cy

Test point Adjustment part Description

TP-47G/R

TP-E (



[CRT SOCKET
PWB]

Mg

5.COLOUR [Method of adjustment using measuring instrument]

)

R

PAL COLOUR

B

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

2. Select

3. Select

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

- or + key.

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

6. Adjust PAL COLOUR to bring the value of

to the value given bellow table. (Voltage diff erence between

(W) and (G))

from SERVICE MENU.

2. V/C

5. COLOUR

Model Name PAL COLOUT

with the MENU ▼/▲ key.

(－)

0V

AV-21D41/BK

(A)

(＋)

AV-21D71/VT

G

in the illustration

(A)

+14V

+10V

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

illustration to the value given bellow table. (Voltage difference

between (W) and (G))

Model Name

AV-21D41/BK

AV-21D71/VT

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

illustration to the value given bellow table. (Voltage difference

between (W) and (G))

Model Name

AV-21D41/BK

SECAM COLOUR

+8V

+9V

NTSC 3.58 COLO UR

+11V

(A)

(A)

in the

in the

AV-21D71/VT

NTSC 4.43 COLOUR

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

respective values.

No. 51925

+9V

23

A

V-21D41

A

V-21D71

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/R and TP-E. ().

6. Adjust NTSC 3.58 TINT to bring the value of

illustration the value given bellow table. (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/R

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

W

Model Name NTSC3.58 TINT

B

R

Mg

(－)

0V

Y

Cy

G

(B)

(＋)

NTSC 4.43 TINT

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

respective values.

AV-21D41/BK +11V

AV-21D71/VT +9V

24

No. 51925

A

V-21D41

A

V-21D71

Item

of SECAM

BLACK

OFFSET

KEY ASSIGNMENT OF REMOTE CONTROL UNIT

Measurin g

instrument

Remote
control unit

Signal
generator

Test point Adjustment part Description

COLOUR

ON

12 3

COLOUR

OFF

7.SECAM

BL ADJUST

[Method of adjustment without measuring instrument]Adju stment

1. Input a SECAM full field colour bar signal.

2. Select

3. Select

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

5. Switch the ①key (c olour OFF) and ②key (colour ON) on the

remote c ontrol unit and make sure that there is no colour on the

black and white screen.

6. If the black and white screen is not best with the initial setting

value, make fine adjustment until you get the best black and

white screen.

7. While watching the screen, adjust the value to be the s ame

colour between ON & OFF by ten key on the remote control

unit.

8. Press the DISPLAY key twice to return to the normal screen.

from SERVICE MENU.

2. V/C

7. SECAM BL ADJUST

with ▼/▲MENU key.

4

7

56

8

9

No. 51925

25

A

V-21D41

A

g

V-21D71

DEFLECTION CIRCUIT ADJUSTMENT

There are 2 modes of adjustment (setting value) ------ ① 50Hz mode and ② 60Hz mode ----- depending upon the kind of signals

z

(vertic al frequency 50Hz / 60Hz).

When adjusted in mode ① , mode ② will be automatic ally set.

z

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

The setting values which adjust the scr een to the optimum condition can be differ ent from the initial setting values.

Item

Adju stment

of

V.HEIGHT



&

V.POSITION

Screen

size

92%

Measurin g

instrument

Test point Adjustment part Description

Signal
generator

Remote
control unit

SUB MENU 3. DEF

DEF

1. VER. POSITION

50Hz

: SELECT

/

- / + : OPERATE DISP : EXIT

Screen size

1.VER. POSITION

3.VER. HEIGHT

PAL

***

Picture
size
100%

1. Input a circle pattern signal.

2. Select

3. Select

from SERVICE MENU.

3. DEF.

1. VER. POSITION

with the MENU ▼/▲ key.

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

5. As shown in Fig.2, adjust V and V’ to be equal with the MENU -

/ + key.

6. Input a crosshatch signal.

7. Select

3. V. HEIGHT

with the MENU ▼/▲ key.

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

9. As shown in Fig.1, adjust
screen size

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

92%

VER. HEIGHT

and make the ver tical

remote c ontrol unit.

Adju stment

of

HOR.



POSITION

26

Picture size 100%

.1

Fi

Signal

2.HOR. POSITION

generator

Remote
control unit

HH"

V

V'

Fig.2

No. 51925

10. Input a circle pattern signal.

11. Select

2. HOR POSITION

with the MENU ▼/▲ key.

12. Set the initial setting value of

MENU - / + key.

13. As shown in Fig.2, adjust

2. HOR. POSITION

with the MENU - / + key.

2. HOR. POSITION

to make

with the

H=H"

A

V-21D41

A

V-21D71

Item

Adju stment

of VER. LIN.

& VER.

SCURVE

Measurin g
instrument

Signal
generator

Remote
control unit

Fig.3

Test point Adjustment part Description

4. VER. LIN.

5. VER. SCURVE

When the vertical linearity has been deteriorated remarkably,

perform the following steps.

14. Input a crosshatch signal.

15. Select

4. VER. LIN.

16. Set the initial s etting value of

with the MENU ▼/▲ key.

4. VER LIN.

key.

TOP

17. Select

5. VER. SCURVE

with the MENU ▼/▲ key.

18. Set the initial setting value of

MENU - / + key.

CENTER

BOTTOM

19. As shown in F ig.3, adjust

so that the spaces of each line at

BOTTOM

become uniform.

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

4. VER. LIN.

60Hz mode.

[NOTE]

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

z

fine straight line.

When adjust again, adjust 50Hz mode first.

z

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

z

with the MENU - / +

5. VER. SCURVE

and

5. VER. SCURVE

TOP, CENTER

with the

and

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

1. Select

4. VSM PRESET

2. Select BRIGHT with the PICTURE MODE key.

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

val ues of

TINT

table.

from the SERVICE MENU.

SHARP

～～～～

to the values shown in the below

4. Respectively select the VSM PRESET mode for SOFT and

STANDARD, and make similar adjustment as in 3 above.

BRIGHT STANDARD SOFT

TINT +15 +15 +15

*

*

*

*

*

*

*

*

*

*

COLOUR +15 +15 +15

BRIGHT +15 +15 +15

CONT

SHARP

AV-21D41/BK +30 +19 +14

AV-21D71/VT +30 +15 +11

AV-21D41/BK +20 +20 +15

AV-21D71/VT +15 +15 +12

No. 51925

27

A

V-21D41

A

V-21D71

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

28

No. 51925

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-21D41
V-21D71

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. 51925

29

AV-21D41
AV-21D71

SELF CHECK FUNCTIONS

1. Outline

This model has self check functions given below. When an abnormality has been detected, the SUB POWER is turned OFF and the LED
flashes to inform of the failure. An abnormality is detected by the signal input state of the control line connected to 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 B1 line is

detected.

CRT NECK protection Operation of CRT NECK

protection circuit.

3. Self check indicating function

When an abnormality has been detected at about 3seconds
after the power is turned on, the SUB POWER is turned off
immediately and the ON TIMER LED flashes.

The main microcomputer
detects the possible abnormality
at 20-msecond intervals and
judges the results in every 24
time. Of the 24 times, if NG is
detected more than 13 times, it
is judged that there is an
abnormality

DITTO DITTO

After about
3 seconds

Power on

Start of
detection

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 plug is taken out and
put in again.

Detection of an
abnormality

Flashing ON TIMER LED

SUB-POWER OFF

[ Indication by ON TIMER LED ]

Item LED flashing intervals

Over-current protection and CRT NECK protection At 0.24-second intervals

30

No. 51925

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

AV21D41BK-BK #3
AV21D71VT-CK #3

VP 0112
DP305155