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

AV-21F9

Item Test point Adjustment part

Adjustment Remote DELAY POINT
of DELAY control unit (AGC TAKE-OVER)
POINT

Setting
(Adjustment)
item

DELAY POINT
(AGC TAKE-OVER)

Measuring
instrument

Variable Initial setting
range value

0 ~ 63 19

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

2. Select 1. IF from the SERVICE MENU.

3. Select 2. DELAY POINT by pressing the 2 key on the remote
control.

4. Adjust the MENU − or + key until video noise disappears.

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

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

Description

V/C (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 adjust the screen to the optimum condition can be different from the initial setting values.

● Do not change the initial setting values of the setting (adjustment) items not listed in "ADJUSTMENT".

[SUB MENU 2. V/C]

Colour system Variable Initial setting value

Setting item range PAL SECAM NTSC 3.58 NTSC 4.43

1. CUT OFF (R / G / B) −128 ~ +127 0 b b b

2. DRIVE (R / B) −128 ~ +127 0 b b b

3. BRIGHT −128 ~ +127 +19 b b b

4. CONT. −42 ~ +42 −4 b b b

5. COLOUR −60 ~ +68 +11 +3 +5 0

6. TINT TV / VIDEO −64 ~ +63 +12 / −4 −4 / −4

7. BLACK OFFSET (R-Y / B-Y) −8 ~ +7 +4 / +2

8. SHARP TV / VIDEO −32 ~ +31 −7 / +1 b b b

9. TEXT (RGB) CONT. −128 ~ +77 +30 b b b

10. B.S.OFF 0 ~ +1 0 b b b

11. B.S.POINT 0 ~ +7 +5 b b b

12. DC TRAN RATE 0 ~ +7 +3 b b b

13. APA-CON FO/SW 0 ~ +3 +1 b b b

14. VSM PHASE 0 ~ +3 +2 b b b

15. VSM GAIN 0 ~ +3 +1 b b b

16. CLL SW 0 ~ +1 +1 b b b

17. CLL LEVEL 0 ~ +3 +2 b b b

18. ABL POINT 0 ~ +7 +2 b b b

19. ABL GAIN 0 ~ +7 +2 b b b

20. Y-DL (TV / VIDEO / S) 0 ~ +7 +2 / +4 / +2 +3 / +3 / +2 +4 / +4 / +2 b

21. P.ACL SW 0 ~ +1 +1 b b b

22. WPL SW 0 ~ +1 0 b b b

23. Y GAMMA 0 ~ +1 0 b b b

: Do not adjust.

No. 56037 15

AV-21F9

Item Test point Adjustment part

Measuring
instrument

Adjustment ● Signal 1. CUTOFF (R)
of WHITE generator CUTOFF (G)
BALANCE CUTOFF (B)
(Low light) ●Remote

control SCREEN VR
unit (In HVT)

V/C 50Hz

1. CUTOFF

a : SELECT

− / + : OPERATE

PAL

(R)

✽ ✽✽

(G)

✽ ✽✽

(B)

✽ ✽✽

DISP : EXIT

REMOTE CONTROL UNIT

H.LINE OFF

12 3

H.LINE ON

R. CUTOFF ( )

R. DRIVE ( )

R. CUTOFF ( )

R. DRIVE ( )

4

789

56

G. CUTOFF ( )
B. CUTOFF ( )

B. DRIVE ( )

B. CUTOFF ( )
B. DRIVE ( )

G. CUTOFF ( )

Description

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

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

3. Select 1. CUTOFF (R), (G) and (B) with MENU a key, and
set each value to initial setting value with 4 ~ 9 keys on the
remote control unit.

4. Press the 1 key on the remote control unit to produce a single
horizontal line.

5. Turn the SCREEN VR fully counterclockwise, then slowly turn
it clockwise to where a red, blue, or green colour is faintly vis­ible.

6. Use keys 4 ~ 9 on the remote control unit and adjust the other
2 colours to where the single horizontal line appears white.

7. Turn the SCREEN VR to where the single horizontal line glows
faintly.

8. Press the 2 key to return to 1. CUTOFF screen.

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

Setting (Adjustment) Variable Initial setting
item range value

R −128 ~ +127 0

1. CUT OFF G −128 ~ +127 0
B −128 ~ +127 0

Adjustment ● Signal 2. DRIVE (R)
of WHITE generator DRIVE (B)
BALANCE
(High light) ● Remote

control
unit

V/C 50Hz

2. DRIVE

a : SELECT

− / + : OPERATE

PAL

✽ ✽✽

(R)
(B)

✽ ✽✽

DISP : EXIT

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

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

3. Select 2. DRIVE (R) / (B) with MENU a key, and set each
value to initial setting value with 4 and 7 keys, or 6 and 9 keys
on the remote control unit.

4. Use the keys 4 and 7 or 6 and 9 to produce a white screen.

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

Setting (Adjustment) Variable Initial setting
item range value

R −128 ~ +127 0

2. DRIVE
B −128 ~ + 127 0

No. 5603716

AV-21F9

Item Test point Adjustment part

Adjustment Remote 3. BRIGHT
of control unit
SUB
BRIGHT

Adjustment Remote 4. CONT.
of control unit
SUB CONT.

Adjustment Remote 5. COLOR
of control unit
SUB
COLOUR-I PAL COLOUR

Measuring
instrument

Description

1. Receive any broadcast.

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

3. Select 3. BRIGHT with the MENU a key.

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.

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

1. Receive any broadcast.

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

3. Select 4. CONT. with the MENU a key.

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.

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

[Method of adjustment without measuring instrument]

(PAL COLOUR)

1. Receive a PAL broadcast.

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

3. Select 5. COLOUR with the MENU a key.

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.

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

SECAM COLOUR

NTSC 3.58 COLOUR

(SECAM COLOUR)

1. Receive a SECAM broadcast.

2. Make fine adjustment of SECAM COLOUR in the same way
as for "PAL COLOUR".

(NTSC 3.58 COLOUR)

1. Receive a NTSC 3.58MHz broadcast.

2. Make similar fine adjustment of NTSC 3.58 COLOUR in the
same way as for "PAL COLOUR".

(NTSC 4.43 COLOUR)

When adjustment is done for NTSC 3.58 COLOUR, appropriate
values are automatically set for NTSC 4.43 COLOUR.

No. 56037 17

AV-21F9

Item Test point Adjustment part

Measuring
instrument

Adjustment ● Signal TP-47G 5. COLOUR
of SUB generator TP-E (

""

")

""

COLOUR-II [CRT

● Oscillo- SOCKET PAL COLOUR

scope PWB]

● Remote

control
unit

B

Mg

R

(A)

Cy

Y

W

G

(−)
0V
(+)

SECAM COLOUR

Description

[Method of adjustment using measuring instrument]

(PAL COLOUR)

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

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

3. Select 5. COLOUR with the MENU a key.

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

− or + key.

5. Connect the oscilloscope between TP-47G and TP-E.

6. Adjust PAL COLOUR to set the value (A) in the figure to +12V

(W & G).

(SECAM COLOUR)

1. Receive 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 set the value (A) in the figure to
+9V (W & G).

NTSC 3.58 COLOUR

No. 5603718

(NTSC 3.58 COLOUR)

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

2. Set the initial setting value of NTSC 3.58 COLOUR with the
MENU − or + key.

3. Adjust NTSC 3.58 COLOUR to set the value (A) in the figure
to +12V (W & G).

(NTSC 4.43 COLOUR)

When adjustment is done for NTSC 3.58 COLOUR, appropriate
values are automatically set for NTSC 4.43 COLOUR.

AV-21F9

Item Test point Adjustment part

Measuring
instrument

Adjustment Remote 6. TINT
of control unit
SUB TINT-I

NTSC 3.58 TINT

Description

[Method of adjustment without measuring instrument]

(NTSC 3.58 TINT)

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

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

3. Select 6. TINT with the MENU a key.

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.

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

(NTSC 4.43 COLOUR)

When adjustment is done for NTSC 3.58 TINT, appropriate val­ues are automatically set for NTSC 4.43 TINT.

Adjustment ● Signal TP-47G 6. TINT
of generator TP-E (

""

")

""

SUB TINT-II [CRT

● Oscillo- SOCKET
scope PWB] NTSC 3.58 TINT

● Remote
control
unit

B

Mg

R

(B)

Cy

W

G

Y

(−)
0V
(+)

[Method of adjustment using measuring instrument]

(NTSC 3.58 TINT)

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

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

3. Select 6. TINT with the MENU a key.

4. Set the initial setting value of NTSC 3.58 with the MENU − or
+ key.

5. Connect the oscilloscope between TP-47G and TP-E.

6. Adjust NTSC 3.58 TINT to set the value (B) in the figure to

+10V (W & Cy).

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

(NTSC 4.43 TINT)

When adjustment is done for NTSC 3.58 TINT, appropriate val­ues are automatically set for NTSC 4.43 TINT.

No. 56037 19

AV-21F9

Item Test point Adjustment part

Measuring
instrument

Adjustment Remote
of BLACK control unit
OFFSET-I
(SECAM) 7. BLACK OFFSET

(R-Y)
(B-Y)

REMOTE CONTROL UNIT

BLACK &
WHITE OFF

BLACK &
WHITE ON

R-Y ( )

R-Y ( )

12 3

4

789

56

B-Y ( )

B-Y ( )

Adjustment ● Signal 35 PIN (R-Y)
of BLACK generator 36 PIN (B-Y)
OFFSET-II IC 201 on
(SECAM) ● Oscillo- MAIN PWB 7. BLACK OFFSET

scope (R-Y)

(B-Y)

● Remote

control
unit

[R-Y]

Flat Flat

(b)(a)

Description

[Method of adjustment without measuring instrument]

1. Receive a SECAM broadcast.

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

3. Select 7. BLACK OFFSET with the MENU a key.

4. Set the initial setting value for BLACK OFFSET (R-Y) and (B­Y) with 4 and 7 or 6 and 9 keys on the remote control unit.

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

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

[Method of adjustment using measuring instrument]

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

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

3. Select 7. BLACK OFFSET with the a key.

4. Connect the oscilloscope between pin 35 of IC 201 and TP-E.

5. By using 4 and 7 keys on the remote control unit, adjust the
BLACK OFFSET (R-Y) so that the waveform changes from
(a) to (b) as shown in the figure.

6. Connect the oscilloscope between pin 36 of IC 201 and TP-E.

7. By using 6 and 9 keys on the remote control unit, adjust the
BLACK OFFSET (B-Y) so that the waveform changes from
(c) to (d) as 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 DISPLAY key twice to return to the normal screen.

[B-Y]

Flat

(c) (d)

Flat

No. 5603720

AV-21F9

DEFLECTION CIRCUIT ADJUSTMENT

● There are 2 modes of adjustment (initial setting value) — 50Hz mode and 60Hz mode — depending upon the kind of signals (vertical
frequency 50Hz / 60Hz).

● When adjusted in 50Hz mode, 60Hz mode will be automatically set.

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.

[SUB MENU 4. DEF]

Setting item Adjustment name Variable range

Initial setting value

50Hz 60Hz

2. V-SHIFT Vertical center −32 ~ +31 0 0

3. V. SIZE Vertical height −64 ~ +63 +5 −1

4. H-CENT Horizontal center −16 ~ +15 −12 −9

7. V-S. CR Vertical height correction −64 ~ +63 0 +1

10. V-LINE Vertical linearity −16 ~ +15 +1 −2

Item Test point Adjustment part

Measuring
instrument

Adjustment ● Signal 2. V-SHIFT
of generator 3. V-SIZE
V-SHIFT &
V-SIZE ● Remote

control
unit

[ fv : 50Hz mode]

1. Receive a circle pattern signal of vertical frequency 50Hz.

2. Select 4. DEF from the SERVICE MENU.

3. Select 2. V-SHIFT with the MENU a key.

4. Set the initial setting value of 2. V-SHIFT with the MENU − / +
key.

Description

5. Adjust V-SHIFT to make "A = B" with the MENU − / + key.

A

6. Receive a cross-hatch signal.

7. Select 3. V-SIZE with the MENU a key.

8. Set the initial setting value of 3. V-SIZE with the MENU − / +
key.

9. Adjust V-SIZE and make the vertical screen size 92% of the
picture size with the MENU − / + key.

Screen size

Screen

size

92%

Picture size 100%

B

Picture
size
100%

(to be continued)

No. 56037 21

AV-21F9

Item Test point Adjustment part

Measuring
instrument

Adjustment 4. H. CENT
of
H. CENTER

CD

Adjustment 7. V-S.CR
of 10. V-LINE
V-S.CR &

V-LINE

TOP

CENTER

Description

10. Receive a circle pattern signal.

11. Select 4. H-CENT with the MENU a key.

12. Set the initial setting value of 4. H. CENT with the MENU − / +
key.

13. Adjust H. CENT to make "C = D" with the MENU − / + key.

● When the vertical linearity has been deteriorated remark­ably, perform the following steps.

14. Receive a cross-hatch signal.

15. Select 7. V-S.CR with the MENU a key.

16. Set the initial setting value of 7. V-S.CR with the MENU − / +
key.

17. Select 10. V-LINE with the MENU a key.

18. Set the initial setting value of 10. V -LINE with the MENU − / +
key.

19. Adjust V-S.CR and V-LINE so that the spaces of each line on
TOP, CENTER and BOTTOM become uniform.

BOTTOM

20. Make sure that the adjustment is properly done on the screen
of 60Hz mode.

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

[NOTE]

● When adjust in 60Hz mode, only 60Hz mode is adjust.

No. 5603722

VSM PRESET ADJUSTMENT

AV-21F9

Item Test point Adjustment part

Measuring
instrument

Setting of Remote 1. TINT
VSM control unit 2. COLOUR
PRESET 3. BRIGHT

4. CONT.

5. SHARP

SUB MENU 5. VSM PRESET

VSM PRESET BRIGHT

1. TINT

✽✽✽

a : SELECT

− / + : OPERATE

DISP : EXIT

Description

(VSM PRESET)

1. Select 5. VSM PRESET from the SERVICE MENU.

2. Select BRIGHT with the PICTURE MODE key.

3. Adjust the MENU a key and MENU − or + key to reset the
set values of 1. TINT ~ 5. SHARP to the values shown in the
table.

4. Respectively select the VSM PRESET mode for SOFT and
STANDARD, and make similar adjustment as in 3 above.

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

[Setting Values for SUB MENU 5. VSM PRESET]

VSM preset
VSM mode BRIGHT STANDARD SOFT
Setting item

1. TINT

SETTING VALUE

2. COLOUR

SETTING VALUE

3. BRIGHT

SETTING VALUE

4. CONT.

SETTING VALUE

5. SHARP

SETTING VALUE

0

0

0

+15 +4 −4

0

bb

b

bb

bb

b

bb

bb

b

bb

bb

b −3

bb

bb

b

bb

bb

b

bb

bb

b

bb

: Do not adjust.

AUDIO ADJUSTMENT

● Do not adjust 3. AUDIO (1. ERROR LIMIT, 2. A2 ID THR, 3. SOUND SYSTEM) in the SERVICE MENU as it requires no adjustment.

[SUB MENU 3. AUDIO]

Setting item Variable range Initial setting value (fixed)

1. ERROR LIMIT (Do not adjust.) 00H ~ FFH 100H

2. A2 ID THR (Do not adjust.) 00H ~ FFH 14H

3. SOUND SYSTEM (Do not adjust.) — —

: Do not adjust.

CENTER ADJUSTMENT

● Do not adjust 6. CENTER (TREBLE, BASS) in the SERVICE MENU as it requires no adjustment.

[SUB MENU 6. CENTER]

Setting item Initial setting value (fixed)

TREBLE (Do not adjust.) +2
BASS (Do not adjust.) 0

: Do not adjust.

No. 56037 23

AV-21F9

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 ON
TIMER 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

Over-current protection

Details of detection

An over-current on the low B 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 5 seconds
after the power is turned on, the SUB POWER is turned off
immediately and the ON TIMER LED flashes.

Method of detection

The main microcomputer detects
the possible abnormality at 30­msec. 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.

DITTO

After about
5 seconds

Power on

Start of
detection

State of abnormality

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

DITTO

Detection of
an abnormality

Flashing ON TIMER LED

SUB-POWER OFF

[ Indication by the LED ]

Item LED flashing intervals Priority of detection

① Over-current protection At 0.2-second intervals 1

➁ CRT NECK protection At 1-second intervals 2

Note: In case of ① + ➁, the item ① will be indicated.

No. 5603726

STANDARD CIRCUIT DIAGRAM

AV-21F9

■ NOTE ON USING CIRCUIT DIAGRAMS

1. SAFETY

The components identified by the
critical for safety. For continued safety replace safety critical
components only with manufactures recommended parts.

2. SPECIFIED VOL T AGE AND W AVEFORM VALUES

The voltage and waveform values have been measured under the
following conditions.
(1)Input signal : Colour bar signal
(2)Setting positions of each knob/button and variable resistor

(3)Internal resistance of tester : DC 20kΩ/V
(4)Oscilloscope sweeping time : H ➞ 20µS/div

(5)Voltage values : All DC voltage values

* Since the voltage values of signal circuit vary to some extent

according to adjustments, use them as reference values.

3. INDICATION OF PARTS SYMBOL [EXAMPLE]

● In the PW board : R1209 ➞ R209

4. INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

● Resistance value
No unit : [Ω]
K: [KΩ]
M : [MΩ]

● Rated allowable power
No indication : 1/4 [W]
Others : As specified

● Type
No indication : Carbon resistor
OMR : Oxide metal film resistor
MFR : Metal film resistor
MPR : Metal plate resistor
UNFR : Non-flammable resistor
FR : Fusible resistor

* Composition resistor 1/2 [W] is specified as 1/2S or Comp.

(2)Capacitors

● Capacitance value
1 or higher : [pF]
less than 1 : [µF]

● Withstand voltage
No indication : DC50 [V]
AC indicated : AC withstand voltage [V]
Others : DC withstand voltage [V]

* Electrolytic Capacitors

47/50 [Example]: Capacitance value [µF]/withstand voltage [V]

!!

! symbol and shading are

!!

: Original setting position when
shipped

: V ➞ 5mS/div
: Others ➞ Sweeping time is

specified.

● Type
No indication : Ceramic capacitor
MY : Mylar capacitor
MM : Metalized mylar capacitor
PP : Polypropylene capacitor
MPP : Metalized polypropylene capacitor
MF : Metalized film capacitor
TF : Thin film capacitor
BP : Bipolar electrolytic capacitor
TAN : Tantalum capacitor

(3)Coils

No unit : [µH]
Others : As specified

(4)Power Supply

: B1
: 12V
: 9V
: 5V

* Respective voltage values are indicated.

(5)Test point

: Test point
: Only test point display

(6)Connecting method

: Connector
: Wrapping or soldering
: Receptacle

(7)Ground symbol

# : LIVE side ground
" : ISOLATED (NEUTRAL) side ground

: EARTH ground
: DIGITAL ground

5. NOTE FOR REPAIRING SERVICE

This model’s power circuit is partly different in the GND. The differ­ence of the GND is shown by the LIVE : (#) side GND and the
ISOLATED (NEUTRAL) : (") side GND. Therefore, care must be
taken for the following points.
(1)Do not touch the LIVE side GND or the LIVE side GND and the

ISOLATED (NEUTRAL) side GND simultaneously. If the above
caution is not respected, an electric shock may be caused.
Therefore, make sure that the power cord is surely removed from
the receptacle when, for example, the chassis is pulled out.

(2)Do not short between the LIVE side GND and ISOLATED (NEU-

TRAL) side GND or never measure with a measuring apparatus
(oscilloscope, etc.) the LIVE side GND and ISOLATED (NEU­TRAL) side GND at the same time. If the above precaution is
not respected , a fuse or any parts will be broken.

● Since the circuit diagram is a standard one, the circuit and
circuit constants may be subject to change for improvement
without any notice.

No. 56037 2-3

AV-21F9

CONTENTS

SEMICONDUCTOR SHAPES ........................................................... 2-4

BLOCK DIAGRAM ............................................................................ 2-5

CIRCUIT DIAGRAMS

MAIN PWB CIRCUIT DIAGRAM............................................................................................... 2-7

AV SW PWB CIRCUIT DIAGRAM ............................................................................................ 2-9

IF PWB CIRCUIT DIAGRAM................................................................................................... 2-11

CRT SOCKET PWB CIRCUIT DIAGRAM .............................................................................. 2-13

FRONT CONTROL PWB CIRCUIT DIAGRAM....................................................................... 2-15

PATTERN DIAGRAMS

FRONT CONTROL PWB PATTERN....................................................................................... 2-16

MAIN PWB PATTERN............................................................................................................. 2-17

AV SW PWB PATTERN........................................................................................................... 2-19

IF PWB PATTERN................................................................................................................... 2-20

CRT SOCKET PWB PATTERN............................................................................................... 2-21

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW

E
C
B

IC

BOTTOM VIEW

OUT
E
IN

CHIP IC

E

CB

IN E OUT

B

(G)C(D)E(S)

FRONT VIEW

1N

TOP VIEW

TOP VIEW

CHIP TR

C

E

CB

E

CB

1N

BE

TOP VIEWFRONT VIEW

1N

N

N

N

1

N

2-4 No. 56037

1

N

No. 56037 No. 560372-62-5

AV-21F9 AV-21F9

Q101

IF AMP

SF101

IC101
PIF/SIF/DET.

Q104

BUFFER

Q109

BUFFER

V.OUT

SIF

OUT

V.IN

V.IN

4

18

13

5

CF103

4.5

TRAP

CF106

6.0

TRAP

Q103

BUFFER

CF104 5.5
CF105 6.5

TRAP

Q107

BUFFER

IF PWB

TV.V

Q151

BUFFER

Q101

SIF AMP

SF101

SF102

Q105-Q107

AMP

Q302

BUFFER

RGB OUT

Q351
Q352
Q353

TU001

IF

SIF

60

48
46

47

45

43

39

38

40

35
37

29

28

26

13

14

16

7

8

10

9

11

1
2
4

SIF

TV.L

TV.R

2

3 5

10 11 125 7 8

C

Y

Y.IN

C.IN

V.OUT

R.OUT

L.OUT

Y.OUT

C.OUT

TV.V

V

L

R

IC401
VIDEO SW

V

L

R

LINE
OUT

V2

L2

R2

V1

L1

R1

S1

IN

S/VIDEO-1

(L)

(R)

10

1

IC601

SURROUND

3 (L) 11

5 (R) 6

IC602

VOL & TONE

IC301

COMB FILTER Y/C SW

C.OUT

Y.OUT

V.IN

DL301

17 (L)

16 (R)

L

LR

34 33

IC501

MULTI SOUND

PROCESSOR

IC101
P.IF / S.IF
SELECTOR

5

6

17

58

R

IC701
MICRO COMPUTER

IC201

V/C DEF.

PROCESSOR

RGB

12 13 14

45

42

Y

C

MAIN PWB

CRT SOCKET

PWB

R / G /B

AV SW PWB

IC702
MEMORY

IC681 AUDIO AMP

KEY

IND.

V

L

R

FRONT

IN

VIDEO-3

FRONT
CONTROL
PWB

SP01

L

L

R

L

R

113

6

8

OSD

IN

VIDEO-2

SP02
R

43

YC

V01

CRT

HEAD-

PHONE

IC604

ALC

3

8

1

19

T921

AC IN

D901

TO REG.

B1

NTSC COMB
FILTER

POWER

ECO SENSOR

No. 56037 2-7 No. 560372-8

AV-21F9 AV-21F9

MAIN PWB CIRCUIT DIAGRAM

AV SW PWB ASS’Y

FOR FRONT CONTROL PWB ASS’Y

PARTS

PARTS

AV­21F9-NS

AV­21F9-NS

FOR
CRT SOCKET
PWB ASS’Y

FOR
CRT SOCKET
PWB ASS’Y

No. 56037 No. 560372-62-5

AV-21F9 AV-21F9

2-102-9

AV SW PWB ASS'Y

SCM0Y208A-H2 (AV-21F9-NS)

No. 56037 2-7 No. 560372-8

AV-21F9 AV-21F9

2-122-11

PARTS

PARTS PARTS PARTS

AV-21F9

-NS

AV-21F9

-NS

AV-21F9

-NS

AV-21F9

-NS

No. 56037 No. 560372-62-5

AV-21F9 AV-21F9

2-142-13

PARTS

AV-21F9

-NS

FOR MAIN PWB ASS'Y

FOR
MAIN PWB
ASS'Y

SCM-3201A-H2 (AV-21F9-NS)

A51LMV20X

1-1

No. 56037

AV-21F9

OPERATING INSTRUCTIONS

2

Locations

Locations of remote control buttons

1

DISPLAY button p.21

2

MENU buttons

• MENU

/

buttons

• MENU –/+ buttons

3

LIVE SPATIAL button p.17

4

CHANNEL

/

buttons p.13

5

SOUND SYSTEM button

p.16

6

COLOUR SYSTEM button p.16

7

TV/VIDEO button p.15

8

Multi Sound button p.17

9

PICTURE MODE button p.16

0

CHANNEL SCAN button p.22

-

RETURN + button p.22

=

POWER button p.6,13,14

~

VOLUME –/+ buttons p.14

!

MUTING button p.17

@

Number buttons p.13

#

-/-- button p.13

$

OFF TIMER button p.21

%

ECO SENSOR button p.21

RM-C237 REMOTE CONTROL UNIT

DISPLAY

LIVE

SPATI AL

MENU

POWER

CHANNEL VOLUME

SYSTEM

COLOUR

OFF TIMER

TV/VIDEO

PICTURE MODE

CHANNEL SCAN

ECO SENSOR

SOUND MUTING

RETURN

I/II

123

456

78

0

9

-/--

=

~

!

@

#
$
%

-

0

9

8

7

6

5

4

3

2

1

3

1

MENU buttons p.26

• MENU button

• MENU –/+ buttons

2

CHANNEL

/

buttons p.14

3

VOLUME –/+ buttons p.14

Locations

Locations of front panel buttons and lamps

4

ECO sensor

5

Remote control sensor

6

ON TIMER lamp p.23

7

POWER lamp p.6,13,14

8

Main power button p.6,14

MENU

CHANNEL

VOLUME

POWER

ON TIMER

EXIT

12 3 5 7684