JVC AV-21F9 Service Manual

SERVICE MANUAL

COLOUR TELEVISION

AV-21F9(NS)

AV-21F9

AV-21F9

BASIC CHASSIS

CM-II'

++−

−

CONTENTS

■ SPECIFICATIONS ........................................................................................................................... 2

■ SAFETY PRECAUTIONS ................................................................................................................ 3

■ FEATURES ...................................................................................................................................... 4

★ OPERATING INSTRUCTIONS (APPENDED).............................................................................. 1-1

■ SPECIFIC SERVICE INSTRUCTIONS ............................................................................................ 4

■ SERVICE ADJUSTMENTS........................................................................................................... .10

★ STANDARD CIRCUIT DIAGRAM (APPENDED) ......................................................................... 2-1

■ PARTS LIST................................................................................................................................... 27

COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD.

No. 56037 1

No. 56037
Aug. 2000

AV-21F9

REPLACEMENT OF MEMORY IC

1. MEMORY IC

This TV uses the following memory IC.

Memory IC: IC1702 on MAIN PW Board

The memory IC memorizes data for correctly operating the
video and deflection circuits. When replacing the memory IC,
be sure to use the same type IC written with the initial values
of data. In other words, use the specific IC listed in "PRINTED
WIRING BOARD PARTS LIST". For its mounting location, re­fer to "ADJUSTMENT LOCATIONS".

2. PROCEDURE FOR REPLACING MEMORY IC

(1) Power off

Switch the power off and unplug the power cord from the
wall outlet.

(2) Replacing the memory IC

Replace the memory IC with new one. Be sure to use the
memory IC written with the initial data values.

(3) Power on

Plug the power cord into the wall outlet and switch the
power on.

(4) Check and setting of SYSTEM CONSTANT SET:

1) Press the DISPLAY key and the PICTURE MODE key
on the remote control unit simultaneously.
The SERVICE MENU screen will be displayed. (See
Fig. 1.)

2) In the SERVICE MENU, press the DISPLAY key and
PICTURE MODE key simultaneously. Then, the SYS­TEM CONSTANT SET screen will be displayed. (See
Fig. 2.)

3) Check whether the setting values of the SYSTEM CON­STANT SET are the same as those indicated in Table

1. If the value is different, select the setting item with
the MENU a key, and set the correct value with
the MENU − / + key.

4) Press the DISPLAY key twice to return to the normal
screen.

(5) Receive channel setting

Refer to the OPERATING INSTRUCTIONS and set the
receive channels (channels preset).

NAME OF REMOTE CONTROL KEYS

POWER

+

MENU

−

+

VOLUME

MUTING

123

456

7809

-/--

MENU
MENU

MENU

+

DISPLAY

MENU

PICTURE
MODE

DISPLAY

−

−

LIVE

SPATIAL

CHANNEL

SYSTEM

COLOUR

SOUND

TV/VIDEO

I/II

PICTURE MODE

RETURN+

CHANNEL SCAN

ECO SENSOR OFF TIMER

(6) User setting

Check the user setting values in Table 2, and if setting
value is different, set the correct value.
For setting, refer to the OPERATING INSTRUCTIONS.

(7) Setting of SERVICE MENU

Verify the setting for each setting item in the SERVICE
MENU. (See Table 3.) If readjustment is necessary, per­form adjustment referring to "SERVICE ADJUSTMENTS".

SERVICE MENU

SERVICE MENU

1. IF

2. V/C 3. AUDIO

4. DEF

5. VSM PRESET

6. CENTER

7. TURBO TIMER OFF

1-7 : SELECT DISP : EXIT

✽✽✽✽✽✽✽✽ ✽✽✽✽✽

✽✽✽ ✽✽✽✽✽

✽✽.✽✽✽✽

✽✽.✽✽✽✽

Fig. 1

SYSTEM CONSTANT - I

SYSTEM CONSTANT SET 1/3

1.COLOUR AUTO : NO

2. COLOUR : MULTI

3. ECO SENSOR : YES

4. BASS : NO-SB-ON

5. VOL LIMITER : YES

6.TEXT : NO

a: SELECT

− / + : OPERATE

DISP : EXIT

SYSTEM CONSTANT - II

SYSTEM CONSTANT SET 2/3

7. MSP : YES

8. LANGUAGE : E/R/A/F

9. EW-PIN IC : NO

10. B/B OFF MUTE : OFF

11. LED : 2

12. D/K NICAM : YES

a: SELECT

− / + : OPERATE

DISP : EXIT

SYSTEM CONSTANT - III

SYSTEM CONSTANT SET 3/3

13. ALC : YES

14. BBE : NO

a: SELECT

− / + : OPERATE

DISP : EXIT

Fig. 2

No. 560376

SETTING OF SYSTEM CONSTANT SET

Table 1

Setting item Setting contents Setting value

AV-21F9

1. COLOUR AUTO NO

2. COLOUR MULTI

3. ECO SENSOR YES

4. BASS NO-SB-ON

5. VOL. LIMITER YES

6. TEXT NO

7. MSP YES

8. LANGUAGE E/R/A/F

9. EW-PIN IC NO

10. B/B OFF MUTE OFF

11. LED 2

12. D/K NICAM YES

13. ALC YES

14. BBE NO

YES NO
MULTI. TRIPLE PAL
YES NO

YES-BB YES-BB-SB YES-SB

NO-SB-OFF NO-SB-ON YES-BA

YES NO
YES NO
YES NO NO-A2
E/R/A/F E/A/F E/A E/F
YES NO
ON OFF
23
YES NO
YES NO
YES NO

USER SETTING VALUES

Table 2

Setting item Setting value Setting item Setting value

SUB POWER ON TREBLE CENTER
CHANNEL POSITION 1 POSITION BASS CENTER

CHANNEL PRESET

VOLUME Appropriate sound volume OFF TIMER OFF
TV/VIDEO TV AUTO SHUTOFF OFF
ON SCREEN DISPLAY POSITION NUMBER DISPLAY ECO SENSOR OFF
COLOUR SYSTEM AUTO PAL LANGUAGE ENGLISH
SOUND SYSTEM B / G ALC HIGH
BILINGUAL MODE STEREO BLUE BACK OFF
PICTURE MODE (VSM) BRIGHT ON TIMER PR1 0:00
LIVE SPATIAL OFF CHILD LOCK OFF

Refer to OPERATING BALANCE CENTER
INSTRUCTIONS VNR OFF

No. 56037 7

AV-21F9

SERVICE MENU SETTING ITEMS

Table 3

Service menu Setting item

1. IF 1. VCO

2. DELAY POINT

2. V / C 1. CUTOFF(R/G/B)

2. DRIVE(R/B)

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT

7. BLACK OFFSET(R-Y/B-Y)

8. SHARP

9. TEXT(RGB)CONT.

10. B.S. OFF

11. B.S. POINT

12. DC TRAN RATE

13. APA-CON FO/SW

14. VSM PHASE

15. VSM GAIN

16. CLL SW

17. CLL LEVEL

18. ABL POINT

19. ABL GAIN

20. Y-DL(TV/VIDEO/S)

21. P. ACL SW

22. WPL SW

23. Y GAMMA

Do not adjust.

Service menu Setting item

3. AUDIO 1. ERROR LIMIT

2. A2 ID THR

3. SOUND SYSTEM

4. DEF 2. V-SHIFT

3. V-SIZE

4. H-CENT

7. V-S. CR

10. V-LINE

5. VSM PRESET 1. TINT
(BRIGHT/STD/SOFT) 2. COLOUR

3. BRIGHT

4. CONT.

5. SHARP

6. CENTER ADJUST TREBLE
BASS

7. TURBO TIMER ON/OFF
Should be set to OFF.
(When you turn the TV power off, the
Turbo Timer is automatically set to
OFF.)

Do not adjust.

Do not adjust.

Do not adjust.

No. 560378

AV-21F9

SERVICE ADJUSTMENTS

BEFORE STARTING SERVICE ADJUSTMENT

1. There are 2 ways for adjusting this TV: One is with the
REMOTE CONTROL UNIT and the other is the conventional
method using adjustment parts and components.

2. The setting (adjustment) using the REMOTE CONTROL
UNIT is made on the basis of the initial setting values. The
setting values which adjust the screen to the optimum con­dition can be different from the initial setting values.

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

4. Turn on the power of the TV and measuring instrument for warm­ing up for at least 30 minutes before starting adjustment.

5. If the receive or input signal is not specified, use the most ap­propriate signal for adjustment.

6. Never touch parts (such as variable resistors, transformers and
capacitors) not shown in the adjustment items of this service
adjustment.

7. Preparation for adjustment (presetting):
Unless otherwise specified in the adjustment items, preset the
following functions with the remote control unit.

PICTURE MODE (VSM)
COLOUR/BRIGHT/CONT./SHARP

VNR
TREBLE/BASS/BALANCE
LIVE SPATIAL
ECO SENSOR

Function

Setting value

BRIGHT
See "VSM Preset"
on page 23.

OFF

CENTER

OFF
OFF

MEASURING INSTRUMENT
AND FIXTURES

1. DC voltmeter (or Digital voltmeter)

2. Oscilloscope

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

4. Remote control unit

ADJUSTMENT/CHECK ITEMS

Adjustment/Check item Page

B1 POWER SUPPLY Check 14
FOCUS Adjustment 14
IF CIRCUIT Adjustment 14
V/C (VIDEO/CHROMA) CIRCUIT Adjustment 15
DEFLECTION CIRCUIT Adjustment 21
VSM PRESET Adjustment 23
AUDIO Adjustment 23
CENTER Adjustment 23
PURITY, CONVERGENCE Adjustment 24

BASIC OPERATION IN SERVICE MENU

1. TOOL OF SERVICE MENU OPERATION

Operate the SERVICE MENU with the remote control unit.

2. SERVICE MENU ITEMS

With the SERVICE MENU, various settings (adjustments) can be made, and they are broadly classified in the following items of settings:

● 1. IF ............................. For entering/adjusting the setting values (adjustment values) of the IF circuit.

● 2. V/C........................... For entering/adjusting the setting values (adjustment values) of the VIDEO/CHROMA circuit.

● 3. AUDIO ..................... For entering/adjusting the setting values (adjustment values) of the multiplicity sound circuit.

(Do not adjust the preset values.)

● 4. DEF ......................... For entering/adjusting the setting values (adjustment values) of the DEFLECTION circuit.

● 5. VSM PRESET ......... For setting the values of STANDARD, SOFT and BRIGHT (Do not adjust the preset values.)

(VSM: video status memory)

● 6. CENTER.................. For setting the CENTER ADJUST values of TREBLE and BASS. (Do not adjust the preset values.)

● 7. TURBO TIMER........ For quick setting the values of TIMER COUNT — adjustable not only by minutes but also by second. If it i s ON,

the time in TIMER mode changes from 1 minute into 1 second temporarily. (Applicable to OFF TIMER, ON
TIMER and AUTO SHUTOFF)

Note: When you turn the TV power off, the Turbo Timer is automatically set to OFF.

No. 5603710

AV-21F9

3. BASIC OPERATION IN SERVICE MENU

SERVICE MENU

(1) How to enter SERVICE MENU

Press the DISPLAY key and the PICTURE MODE key on
the remote control unit simultaneously.
The SERVICE MENU screen will be displayed. (See Fig. 1.)

SERVICE MENU

1. IF

2. V/C 3. AUDIO

4. DEF

5. VSM PRESET

6. CENTER

7. TURBO TIMER OFF

1-7 : SELECT DISP : EXIT

✽✽✽✽✽✽✽✽ ✽✽✽✽✽

✽✽.✽✽✽✽

✽✽✽ ✽✽✽✽✽

✽✽.✽✽✽✽

Fig. 1

(2) Selection of SUB MENU SCREEN

Press one of the keys 1 ~ 7 on the remote control unit, and select the SUB MENU SCREEN from the SERVICE MENU. (See Fig. 2 on
the next page.)

SERVICE MENU → SUB MENU 1. IF

2. V / C

3. AUDIO

4. DEF

5. VSM PRESET

6. CENTER

7. TURBO TIMER

(3) Method of Setting

*Once the setting values are set, they are memorized automatically.
*It must not adjust without inputting a signal.

1) 1. IF

[1. VCO]

(a) 1 Key ......................................... Select 1. IF.

(b) 1 Key ......................................... Select 1. VCO. (CW)

(c) VCO(CW) TRANSF. .................. Adjust VCO(CW) while watching the colour (yellow/blue) of the characters on the screen.

(d) DISPLAY Key ............................ When this is pressed twice, you will return to the SERVICE MENU.

[2. DELAY POINT]

(a) 1 Key ......................................... Select 1. IF.

(b) 2 Key ......................................... Select 2. DELAY POINT.

(c) MENU − / + Key......................... Adjust the setting value.

(d) DISPLAY Key ............................ When this is pressed twice, you will return to the SERVICE MENU.

2) 2. V/C, 3. AUDIO, 4. DEF, 5. VSM PRESET and 6. CENTER

(a) 2 ~ 6 Keys ................................. Select one from 2. V/C, 3. AUDIO, 4. DEF, 5. VSM PRESET and 6. CENTER.

(b) MENU a key........................ Select setting items.

(c) MENU − / + Key......................... Adjust the setting values of the setting items.

● Use the number keys on the remote control unit for setting of WHITE BALANCE and BLACK
OFFSET. For the setting, refer to each item concerned.

(d) DISPLAY Key ............................ When this is pressed, you will return to the SERVICE MENU.

3) 7. TURBO TIMER

(a) 7 Key ......................................... Each time you press the key, ON/OFF state of TURBO TIMER changes.

(Should be set to OFF.)

(4) Release of SERVICE MENU

After completing the setting, return to the SERVICE MENU by pressing the DISPLAY key, then again press the DISPLAY key to return
to the normal screen.

No. 56037 11

AV-21F9

SUB MENU SCREEN

SERVICE MENU

SERVICE MENU

1. IF

2. V/C 3. AUDIO

4. DEF

5. VSM PRESET

6. CENTER

7. TURBO TIMER OFF

1-7 : SELECT DISP : EXIT

✽✽✽✽✽✽✽✽ ✽✽✽✽✽

✽✽✽ ✽✽✽✽✽

✽✽.✽✽✽✽

✽✽.✽✽✽✽

SUB MENU 5. VSM PRESET

VSM PRESET BRIGHT

1. TINT

✽✽✽

a : SELECT

− / + : OPERATE

BRIGHT / STD / SOFT

Setting item

1. TINT

2. COLOUR

3. BRIGHT

4. CONT.

5. SHARP

DISP : EXIT

SUB MENU 1. IF

IF

1. VCO

2. DELAY POINT

1-2 : SELECT DISP : EXIT

SUB MENU 2. V/C

V/C 50Hz

1. CUTOFF

a : SELECT

− / + : OPERATE

PAL

✽ ✽✽

(R)
(G)

✽ ✽✽
✽ ✽✽

(B)

DISP : EXIT

VCO (CW)

TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW

AGC TAKE-OVER

− / + : OPERATE

Setting item

1. CUTOFF(R/G/B)

2. DRIVE(R/B)

3. BRIGHT

4. CONT.

5. COLOUR

6. TINT

7. BLACK OFFSET(R-Y/B-Y)

8. SHARP

9. TEXT(RGB)CONT.

10. B.S.OFF

11. B.S.POINT

12. DC TRAN RATE

✽✽✽.✽✽ MHz

DELAY POINT

DISP : EXIT

13. APA-CON FO/SW

14. VSM PHASE

15. VSM GAIN

16. CLL SW

17. CLL LEVEL

18. ABL POINT

19. ABL GAIN

20. Y-DL(TV ./VIDEO/S)

21. P.ACL SW

22. WPL SW

23. Y GAMMA

DISP : EXIT

✽✽

Setting item

SUB MENU 6. CENTER

CENTER ADJUST

TREBLE
BASS

✽✽
✽✽

a : SELECT

− / + : OPERATE

7. TURBO TIMER

TURBO TIMER

DISP : EXIT

OFF

ON

SUB MENU 3. AUDIO

AUDIO

✽✽.✽✽

1. ERROR LIMIT
C AD BITS
NICAM ERROR

a : SELECT

− / + : OPERATE

SUB MENU 4. DEF

DEF 50Hz

2. V-SHIFT

(✽✽)

a : SELECT

− / + : OPERATE

Fig. 2

MHz

✽✽✽
✽✽✽✽✽✽✽✽
✽✽ ✽✽

DISP : EXIT

✽✽✽

DISP : EXIT

Setting item

1. ERROR LIMIT

2. A2 ID THR

3. SOUND SYSTEM

50Hz / 60Hz

Setting item

2. V-SHIFT

3. V-SIZE

4. H-CENT

7. V-S. CR

10. V-LINE

No. 5603712

AV-21F9

ADJUSTMENTS

B1 POWER SUPPLY

Item Test point Adjustment part

Measuring
instrument

Check of Signal TP-91 (B1)
B1 POWER Generator TP-E (

""

")

""

SUPPLY [S1

DC Voltmeter connector]

FOCUS ADJUSTMENT

Item Test point Adjustment part

Adjustment Signal FOCUS VR
of FOCUS generator [In HVT]

Measuring
instrument

IF CIRCUIT ADJUSTMENT

Description

1. Receive a whole black signal.

2. Connect a DC voltmeter between TP-91 (B1) and TP-E (")
(between pins 1 and 5 of the connector S1).

3. Make sure that the voltage is DC113.3 ± 1.5V.

Description

1. Receive 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 that, when the screen is darkened, the lines remain
in good focus.

Item Test point Adjustment part

Measuring
instrument

Adjustment Remote VCO (CW)
of VCO (CW) control unit TRANSF.

[On IF PWB]

fv

YELLOW

Screen display

VCO (CW) ✽✽✽.✽✽ MHz

TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW

DISP : EXIT

Step

123
TOO HIGH Yellow Blue Blue
ABOVE REFERENCE Blue Yellow Blue
BELOW REFERENCE Blue Blue Yellow
TOO LOW Blue Blue

Description

● Under normal conditions, no adjustment is required.

1. Select 1. IF from the SERVICE MENU.

2. Press the 1 key to select 1. VCO.

3. Select a receivable broadcast channel with the CHANNEL key .

4. Turn the core of VCO(CW) TRANSF. until the colour of the
characters "TOO HIGH" displayed on the screen changes from
blue to yellow. (Step 1)

5. Then slowly turn the core of VCO(CW) TRANSF . counterclock­wise until the characters "ABOVE REFERENCE" changes from
blue to yellow. (Step 2)

6. Further slowly turn the core of VCO(CW) TRANSF. until the
colour of the characters "BELOW REFERENCE" changes from
blue to yellow. (Step 3)

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

8. Perform CHANNEL PRESET again, and make sure that each
broadcast is being received properly.

No. 5603714