JVC AV-21F9 User manual

No. 56037 1
AV-21F9
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
BASIC CHASSIS
CM-II'
SERVICE MANUAL
COLOUR TELEVISION
AV-21F9(NS)
COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD. No. 56037
Aug. 2000
AV-21F9
+
+
−
−

AV-21F9
No. 560376
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, re-
fer 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 SYS-
TEM CONSTANT SET screen will be displayed. (See
Fig. 2.)
3) Check whetherthe setting valuesof the SYSTEMCON-
STANT SET are the same as those indicated in Table
1. If the value is different, select the setting item with
the MENU akey, 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
Fig. 1
(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, per-
form adjustment referring to "SERVICEADJUSTMENTS".
SERVICE MENU
1. IF
4. DEF
6. CENTER
7.TURBOTIMER OFF
2.V/C 3. AUDIO
5.VSM PRESET
SERVICE MENU
1-7 : SELECT DISP : EXIT
✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
DISPLAY POWER
MENU
+
+
−
−
LIVE
SPATIAL
CHANNEL VOLUME
SYSTEM
COLOUR SOUND MUTING
PICTURE MODE
RETURN+
ECO SENSOR OFF TIMER
123
456
78
0
9
-/--
MENU
MENU
MENU
+
PICTURE
MODE
DISPLAY
MENU
−
TV/VIDEO
CHANNEL SCAN
I/II
1.COLOUR AUTO : NO
2. COLOUR : MULTI
3. ECO SENSOR :YES
4. BASS : NO-SB-ON
5. VOL LIMITER : YES
6.TEXT : NO
SYSTEM CONSTANT - I
SYSTEM CONSTANT SET 1/3
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
SYSTEM CONSTANT - II
SYSTEM CONSTANT SET 2/3
−/+: OPERATE DISP : EXIT
− / + : OPERATE DISP : EXIT
13. ALC : YES
14. BBE : NO
SYSTEM CONSTANT - III
SYSTEM CONSTANT SET 3/3
− / + : OPERATE DISP : EXIT
Fig. 2
a: SELECT
a: SELECT
a: SELECT

No. 56037 7
AV-21F9
Setting item Setting value Setting item Setting value
SUB POWER ON TREBLE CENTER
CHANNEL POSITION 1 POSITION BASS CENTER
Refer to OPERATING BALANCE CENTER
INSTRUCTIONS VNR OFF
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
USER SETTING VALUES Table 2
CHANNEL PRESET
SETTING OF SYSTEM CONSTANT SET Table 1
Setting item Setting contents Setting value
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

AV-21F9
No. 560378
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.)
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.
Do not adjust.
Do not adjust.
Do not adjust.

AV-21F9
No. 5603710
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
MEASURING INSTRUMENT
AND FIXTURES
1. DC voltmeter (or Digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator)
[PAL / SECAM / NTSC]
4. Remote control unit
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 is 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.
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 con-
dition can be different from the initial setting values.
3. Make surethat connection iscorrectly made toACpowersource.
4. Turnon the powerof theTV and measuringinstrumentfor warm-
ing up for at least 30 minutes before starting adjustment.
5. If the receive or input signal is not specified, use the most ap-
propriate 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.
Function
PICTURE MODE (VSM)
COLOUR/BRIGHT/CONT./SHARP
VNR
TREBLE/BASS/BALANCE
LIVE SPATIAL
ECO SENSOR
Setting value
BRIGHT
See "VSM Preset"
on page 23.
OFF
CENTER
OFF
OFF
ADJUSTMENT/CHECK ITEMS
Adjustment/Check item Page
B1 POWER SUPPLY Check 14
FOCUS Adjustment 14
IF CIRCUITAdjustment 14
V/C (VIDEO/CHROMA) CIRCUITAdjustment 15
DEFLECTION CIRCUIT Adjustment 21
VSM PRESET Adjustment 23
AUDIO Adjustment 23
CENTER Adjustment 23
PURITY, CONVERGENCE Adjustment 24

No. 56037 11
AV-21F9
3. BASIC OPERATION IN 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.)
(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 akey........................ 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.
SERVICE MENU
1. IF
4. DEF
6. CENTER
7.TURBOTIMER OFF
2.V/C 3. AUDIO
5.VSM PRESET
SERVICE MENU
1-7 : SELECT DISP : EXIT
✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
Fig. 1

AV-21F9
No. 5603712
SUB MENU SCREEN
Fig. 2
SERVICE MENU
VSM PRESET BRIGHT
1.TINT
✽✽✽
SUB MENU 5.VSM PRESET
a: SELECT
− / + : OPERATE DISP : EXIT
BRIGHT / STD / SOFT
Setting item
1.TINT
2. COLOUR
3. BRIGHT
4. CONT.
5. SHARP
CENTER ADJUST
TREBLE
✽✽
BASS ✽✽
SUB MENU 6. CENTER
a: SELECT
− / + : OPERATE DISP : EXIT
1.VCO
2. DELAY POINT
1-2 : SELECT DISP : EXIT
IF
SUB MENU 1. IF
VCO (CW) ✽✽✽.✽✽ MHz
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
DISP : EXIT
DELAY POINT
AGCTAKE-OVER
✽✽
−/+: OPERATE DISP : EXIT
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. DCTRAN 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
Setting item
PAL
1. CUTOFF (R)
✽ ✽✽
(G) ✽ ✽✽
− / + : OPERATE DISP : EXIT
(B)
✽ ✽✽
a: SELECT
V/C 50Hz
SUB MENU 2.V/C
Setting item
1. ERROR LIMIT
2. A2 ID THR
3. SOUND SYSTEM
−/+: OPERATE DISP : EXIT
a: SELECT
AUDIO
✽✽.✽✽ MHz
SUB MENU 3. AUDIO
1. ERROR LIMIT ✽✽✽
C AD BITS ✽✽✽✽✽✽✽✽
NICAM ERROR ✽✽ ✽✽
−/+: OPERATE DISP : EXIT
a: SELECT
DEF 50Hz
SUB MENU 4. DEF
2.V-SHIFT ✽✽✽
(✽✽)
50Hz / 60Hz
2.V-SHIFT
3.V-SIZE
4. H-CENT
7.V-S. CR
10.V-LINE
Setting item
1. IF
4. DEF
6. CENTER
7.TURBOTIMER OFF
2.V/C 3. AUDIO
5.VSM PRESET
SERVICE MENU
1-7 : SELECT DISP : EXIT
✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
7.TURBOTIMER
TURBOTIMER OFF
ON

AV-21F9
No. 5603714
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.
Measuring
Item Test point Adjustment part
instrument
Adjustment Remote VCO (CW)
of VCO (CW) control unit TRANSF.
[On IF PWB]
Description
●Under normal conditions, no adjustment is required.
1. Select 1. IF from the SERVICE MENU.
2. Press the 1key 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. counterclock-
wiseuntilthe characters "ABOVE REFERENCE"changesfrom
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.
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item Test point Adjustment part
instrument
Check of Signal TP-91 (B1)
B1 POWER Generator TP-E (""
""
")
SUPPLY [S1
DC Voltmeter connector]
Measuring
Item Test point Adjustment part
instrument
Adjustment Signal FOCUS VR
of FOCUS generator [In HVT]
FOCUS ADJUSTMENT
IF CIRCUIT ADJUSTMENT
Step
Screen display 123
TOO HIGH Yellow Blue Blue
ABOVE REFERENCE Blue Yellow Blue
BELOW REFERENCE Blue Blue Yellow
TOO LOW Blue Blue
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
VCO (CW) ✽✽✽.✽✽ MHz
DISP : EXIT
fv
YELLOW

No. 56037 15
AV-21F9
Measuring
Item Test point Adjustment part
instrument
Adjustment Remote DELAY POINT
of DELAY control unit (AGC TAKE-OVER)
POINT
Description
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 2key 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 irregu-
larities.
Setting Variable Initial setting
(Adjustment) range value
item
DELAY POINT 0 ~63 19
(AGC TAKE-OVER)
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".
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 −4b 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 / +1b 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.
[SUB MENU 2. V/C]

AV-21F9
No. 5603716
Measuring
Item Test point Adjustment part
instrument
Adjustment ●Signal 1. CUTOFF (R)
of WHITE generator CUTOFF (G)
BALANCE CUTOFF (B)
(Low light) ●Remote
control SCREEN VR
unit (In HVT)
Adjustment ●Signal 2. DRIVE (R)
of WHITE generator DRIVE (B)
BALANCE
(High light) ●Remote
control
unit
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 akey, and
set each value to initial setting value with 4~ 9keys on the
remote control unit.
4. Press the 1key 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 vis-
ible.
6. Use keys 4~ 9on 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 2key to return to 1. CUTOFF screen.
9. Press the DISPLAY key twice to return to the normal screen.
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 akey, and set each
value to initial setting value with 4and 7keys, or 6and 9keys
on the remote control unit.
4. Use the keys 4and 7or 6and 9to 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
R. CUTOFF ( )
G. CUTOFF ( )
H.LINE OFF
H.LINE ON
12 3
4
789
56
R. CUTOFF ( )
R. DRIVE ( )
R. DRIVE ( )
G. CUTOFF ( )
B. CUTOFF ( )
B. DRIVE ( )
B. CUTOFF ( )
B. DRIVE ( )
REMOTE CONTROL UNIT
Setting (Adjustment) Variable Initial setting
item range value
R−128 ~+127 0
1. CUT OFF G −128 ~+127 0
B−128 ~+127 0
PAL
1. CUTOFF (R)
✽ ✽✽
(G) ✽ ✽✽
− / + : OPERATE DISP : EXIT
(B)
✽ ✽✽
a: SELECT
V/C 50Hz
PAL
2. DRIVE (R)
✽ ✽✽
(B) ✽ ✽✽
− / + : OPERATE DISP : EXIT
a: SELECT
V/C 50Hz