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AV-21F8
SERVICE MANUAL
COLOUR TELEVISION
BASIC CHASSIS
CL-M
AV-21F8(VT)
- +
- +
CONTENTS
s SPECIFICATIONS ........................................................................................................................... 2
s SAFETY PRECAUTIONS ................................................................................................................ 3
s FEATURES ...................................................................................................................................... 4
5 OPERATING INSTRUCTIONS (APPENDED) .............................................................................. 1-1
s SPECIFIC SERVICE INSTRUCTIONS ............................................................................................ 4
s SERVICE ADJUSTMENTS ............................................................................................................ 10
5 STANDARD CIRCUIT DIAGRAM (APPENDED) ......................................................................... 2-1
s PARTS LIST ................................................................................................................................... 27
No. 56036
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
No. 56036 1
Jun. 2000
AV-21F8
SPECIFICATIONS
Item Content
Dimensions (W × H × D) 619mm × 458mm × 486.5mm
Mass 22kg
TV RF System B / G, D / K, K1, M
Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC4.43
VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43
Receiving Frequency VHF (VL) 46.25MHz ~ 168.25MHz
VHF (VH) 175.25MHz ~ 463.25MHz
UHF 471.25MHz ~ 863.25MHz
CATV q Cable TVs of Mid (X-Z, S1-S10)
Super (S11-S20) & Hyper (S21-S41) bands receivable
Intermediate VIF Carrier 38.0MHz
Frequency 31.5MHz (6.5MHz)
SIF Carrier 32.5MHz (5.5MHz)
33.5MHz (4.5MHz)
Colour Sub Carrier Frequency PAL (4.43MHz), SECAM (4.40625MHz / 4.25MHz)
NTSC (3.58MHz / 4.43MHz)
Aerial Input Terminal 75 Unbalanced
Power Input Rating: AC110 ~ 240V, 50/60Hz Operating: AC90 ~ 260V, 50/60Hz
Power Consumption 110W (Max.) / 78W (Avg.)
Picture Tube Visible size : 51cm measured diagonally
High Voltage 28kV ± 1kV (at zero beam current)
Speaker 6cm × 12 cm Oval type × 2
Audio Output 5W + 5W
Input Video 1Vp-p, 75
Audio (L/R) 500mVrms (-4dBs), High impedance
Output Video 1Vp-p, 75
Audio (L/R) 500mVrms (4dBs), Low impedance
Remote Control Unit RM-C218-1C (Battery size : AA/R06/UM-3 × 2)
Design & specifications are subject to change without notice.
2 No. 56036
AV-21F8
SAFETY PRECAUTIONS
1. The design of this product contains special hardware, many 8. When service is required, observe the original lead dress. Ex-
circuits and components specially for safety purposes. For con- tra precaution should be given to assure correct lead dress in
tinued protection, no changes should be made to the original the high voltage circuit area. Where a short circuit has occurred,
design unless authorized in writing by the manufacturer. Re- those components that indicate evidence of overheating should
placement parts must be identical to those used in the original be replaced. Always use the manufacturer's replacement com-
circuits. Service should be performed by qualified personnel ponents.
only.
9. Isolation Check
2. Alterations of the design or circuitry of the products should not (Safety for Electrical Shock Hazard)
be made. Any design alterations or additions will void the After re-assembling the product, always perform an isolation
manufacturer's warranty and will further relieve the manufac- check on the exposed metal parts of the cabinet (antenna ter-
turer of responsibility for personal injury or property damage minals, video/audio input and output terminals, Control knobs,
resulting therefrom. metal cabinet, screw heads, earphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger of elec-
3. Many electrical and mechanical parts in the products have spe- trical shock.
cial safety-related characteristics. These characteristics are of- (1) Dielectric Strength Test
ten not evident from visual inspection nor can the protection The isolation between the AC primary circuit and all metal parts
afforded by them necessarily be obtained by using replace- exposed to the user, particularly any exposed metal part hav-
ment components rated for higher voltage, wattage, etc. Re- ing a return path to the chassis should withstand a voltage of
placement parts which have these special safety characteris- 3000V AC (r.m.s.) for a period of one second.
tics are identified in the parts list of Service manual. Electrical (. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance
components having such features are identified by shad- rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated
ing on the schematics and by (!) on the parts list in Ser- 200V or more, for a period of one second.)
vice manual. The use of a substitute replacement which does This method of test requires a test equipment not generally
not have the same safety characteristics as the recommended found in the service trade.
replacement part shown in the parts list of Service manual may (2) Leakage Current Check
cause shock, fire, or other hazards. Plug the AC line cord directly into the AC outlet (do not use a
line isolation transformer during this check.). Using a "Leakage
4. Don't short between the LIVE side ground and ISOLATED Current Tester", measure the leakage current from each ex-
(NEUTRAL) side ground or EARTH side ground when re- posed metal part of the cabinet, particularly any exposed metal
pairing. part having a return path to the chassis, to a known good earth
Some model's power circuit is partly different in the GND. The ground (water pipe, etc.). Any leakage current must not exceed
difference of the GND is shown by the LIVE : (#) side GND, 0.5mA AC (r.m.s.).
the ISOLATED (NEUTRAL) : (") side GND and EARTH : ($) However, in tropical area, this must not exceed 0.2mA AC
side GND. Don't short between the LIVE side GND and ISO- (r.m.s.).
LATED (NEUTRAL) side GND or EARTH side GND and never q Alternate Check Method
measure with a measuring apparatus (oscilloscope etc.) the Plug the AC line cord directly into the AC outlet (do not use a
LIVE side GND and ISOLATED (NEUTRAL) side GND or line isolation transformer during this check.). Use an AC volt-
EARTH side GND at the same time. meter having 1000 ohms per volt or more sensitivity in the fol-
If above note will not be kept, a fuse or any parts will be bro- lowing manner. Connect a 1500 10W resistor paralleled by a
ken. 0.15µF AC-type capacitor between an exposed metal part and
a known good earth ground (water pipe, etc.). Measure the AC
5. If any repair has been made to the chassis, it is recommended voltage across the resistor with the AC voltmeter. Move the
that the B1 setting should be checked or adjusted (See AD- resistor connection to each exposed metal part, particularly any
JUSTMENT OF B1 POWER SUPPLY). exposed metal part having a return path to the chassis, and
measure the AC voltage across the resistor. Now, reverse the
6. The high voltage applied to the picture tube must conform with plug in the AC outlet and repeat each measurement. Any volt-
that specified in Service manual. Excessive high voltage can age measured must not exceed 0.75V AC (r.m.s.). This corre-
cause an increase in X-Ray emission, arcing and possible com- sponds to 0.5mA AC (r.m.s.).
ponent damage, therefore operation under excessive high volt- However, in tropical area, this must not exceed 0.3V AC (r.m.s.).
age conditions should be kept to a minimum, or should be pre- This corresponds to 0.2mA AC (r.m.s.).
vented. If severe arcing occurs, remove the AC power immedi-
ately and determine the cause by visual inspection (incorrect AC VOLTMETER
installation, cracked or melted high voltage harness, poor sol- (HAVING 1000/V,
dering, etc.). To maintain the proper minimum level of soft X- OR MORE SENSITIVITY)
Ray emission, components in the high voltage circuitry includ-
ing the picture tube must be the exact replacements or alterna-
tives approved by the manufacturer of the complete product.
7. Do not check high voltage by drawing an arc. Use a high volt- 0.15µF AC-TYPE
age meter or a high voltage probe with a VTVM. Discharge the
picture tube before attempting meter connection, by connect- PLACE THIS PROBE
ing a clip lead to the ground frame and connecting the other ON EACH EXPOSED
1500 10W METAL PART
end of the lead through a 10k 2W resistor to the anode but-
ton. GOOD EARTH GROUND
No. 56036 3
AV-21F8
FEATURES
q New chassis design enables use of an interactive on-screen control.
q Wide range voltage for AC power input.
q With AUDIO / VIDEO INPUT & OUTPUT terminals.
q MUTING button can reduce the audio level to zero instantly.
q Functional remote control to operate TV set (for channel select, volume control, power ON/OFF, etc.) from a distance.
q I2C bus control utilizes single chip ICs for IF, V/C (Video/Chroma) and VSM (Video Status Memory).
q By means of AUTO PROGRAM, the TV stations can be selected automatically and the TV channels can also be rearranged
automatically.
q Built-in ECO MODE (ECONOMY, ECOLOGY)
In accordance with the brightness in a room, the brightness and/or contrast of the picture can be adjusted automatically to
make the optimum picture which is easy on the eye.
q Built-in ON TIMER & RETURN +.
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the AC power cord.
2. Remove the 6 screws marked "A" and 2 screws marked "B".
3. Withdraw the rear cover backward.
REMOVING THE MAIN PW BOARD
q After removing the rear cover.
1. Slightly raise both sides of the Main PW Board by hand and
withdraw it backward.
(If necessary, take off the wire clamp, connectors etc.)
REMOVING THE SPEAKER
q After removing the rear cover.
1. Remove the 2 screws marked "C".
2. Follow the same step for removing the other hand speaker.
CHECKING THE MAIN PW BOARD
To check the back side of the Main PW Board, follow the next steps.
1. Pull out the Main PW Board. (Refer to "REMOVING THE MAIN
PW BOARD".)
2. Erect the Main PW Board vertically so that you can easily check
its back side.
CAUTION:
q When erecting the Main PW Board, be careful so that there will
be no contacting with other PW Board.
q Before turning on power, make sure that all connectors are prop-
erly 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.
4 No. 56036
AV-21F8
FRONT CABINET
SPEAKER
C (×2)
CRT SOCKET PWB
MAIN PWB
SPEAKER C (×2)
REAR COVER
B (×2)
A (×6)
No. 56036 5
AV-21F8
REPLACEMENT OF MEMORY IC
1. MEMORY IC SERVICE MENU
This TV uses the following memory IC.
Memory IC: IC1702 on MAIN PW Board SERVICE MENU
The memory IC memorizes data for correctly operating the
video and deflection circuits. When replacing the memory IC, 1. IF 2. V/C
be sure to use the same type IC written with the initial values 3. VSM PRESET
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". 1-3 : SELECT DISP : EXIT
VVVVVVVV VVVVV VV.VVVV
2. PROCEDURE FOR REPLACING MEMORY IC VVV VVVVV VV.VVVV
(1) Power off
Fig. 1
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.
SYSTEM CONSTANT - I
(3) Power on SYSTEM CONSTANT SET 1/3
Plug the power cord into the wall outlet and switch the
power on. 1. INCH : 21
2. COLOUR : MULTI
3. VIDEO INPUT :1
(4) Check and setting of SYSTEM CONSTANT SET:
4. ECO SENSOR : YES
1) Press the DISPLAY key and the PICTURE MODE key 5. SUPER BASS : NO
on the remote control unit simultaneously.
The SERVICE MENU screen will be displayed. (See a: SELECT
Fig. 1.) - / + : OPERATE DISP : EXIT
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 SYSTEM CONSTANT - II
Fig. 2.)
3) Check whether the setting values of the SYSTEM CON- SYSTEM CONSTANT SET 2/3
STANT SET are the same as those indicated in Table
1. If the value is different, select the setting item with 6. SPATIALIZER : YES
7. VOL. LIMITER : YES
the MENU a key, and set the correct value with
8. B/B SOUND : NO
the MENU - / + key. 9. TEXT : NO
4) Press the DISPLAY key twice to return to the normal 10. COLOUR AUTO : NO
screen.
a: SELECT
(5) Receive channel setting - / + : OPERATE DISP : EXIT
Refer to the OPERATING INSTRUCTIONS and set the
receive channels (channels preset).
SYSTEM CONSTANT - III
(6) User setting
Check the user setting values in Table 2, and if setting SYSTEM CONSTANT SET 3/3
value is different, set the correct value.
11. LANGUAGE : E/V
For setting, refer to the OPERATING INSTRUCTIONS.
12. TUNER : MU
13. AMP TUNER : YES
(7) Setting of SERVICE MENU 14. VNR : NO
Verify the setting for each setting item in the SERVICE
MENU. (See Table 3.) If readjustment is necessary, per-
form adjustment referring to "SERVICE ADJUSTMENTS". a: SELECT
- / + : OPERATE DISP : EXIT
Fig. 2
6 No. 56036
AV-21F8
NAME OF REMOTE CONTROL KEYS
POWER
DISPLAY
DISPLAY MENU
MENU - - MENU + MENU +
LIVE
SPATIAL
MENU
CHANNEL - VOLUME +
SYSTEM PICTURE
COLOUR SOUND BOOSTER MUTING
TV/VIDEO 1 2 3
4 5 6
PICTURE MODE 7 8 9
PICTURE
MODE CHANNEL SCAN RETURN+ 0 -/--
ECO SENSOR OFF TIMER
SETTING OF SYSTEM CONSTANT SET
Table 1
Setting item Setting contents Setting value
RM-C234 REMOTE CONTROL UNIT
1. INCH 29 25 21 14 21
2. COLOUR MULTI. TRIPLE PAL MULTI
3. VIDEO INPUT 1 3 1
4. ECO SENSOR YES NO YES
5. SUPER BASS YES NO NO
6. SPATIALIZER YES NO YES
7. VOL. LIMITER YES NO YES
8. B/B SOUND YES NO NO
9. TEXT YES NO NO
10. COLOUR AUTO YES NO NO
11. LANGUAGE E E/V E/V
12. TUNER MU MA MU
13. AMP TUNER YES NO YES
14. VNR YES NO NO
USER SETTING VALUES
Table 2
Setting item Setting value Setting item Setting value
SUB POWER ON BASS CENTER
CHANNEL POSITION 1 POSITION BALANCE CENTER
CHANNEL PRESET Refer to OPERATING INSTRUCTION. OFF TIMER OFF
VOLUME Appropriate sound volume AUTO SHUTOFF OFF
TV/VIDEO TV ECO SENSOR OFF
ON SCREEN DISPLAY POSITION NUMBER DISPLAY LANGUAGE VIETNAMESE
COLOUR SYSTEM PAL BLUE BACK OFF
SOUND SYSTEM B/G ON TIMER PR1 0:00
PICTURE MODE (VSM) BRIGHT CHILD LOCK OFF
LIVE SPATIAL OFF PICTURE BOOSTER OFF
TREBLE CENTER
No. 56036 7
AV-21F8
SERVICE MENU SETTING ITEMS
Table 3
Service menu Setting item Service menu Setting item
1. IF 1. VCO 3. VSM PRESET TINT
2. DELAY POINT (BRIGHT/STD/SOFT) COLOUR
BRIGHT Do not adjust.
CONT.
2. V / C 1. CUTOFF(R/G/B) SHARP
2. DRIVE(R/B)
3. BRIGHT
4. CONT.
5. COLOUR
6. TINT (TV/VIDEO)
7. BLACK OFFSET(R-Y/B-Y)
8. SHARP
9. TEXT(RGB)CONT.
10. H. CENTER
11. V. HEIGHT Do not adjust.
12. V. LIN
13. V.S-CR
14. V. CENTER
15. AMP T. SHARP
8 No. 56036
AV-21F8
REPLACEMENT OF CHIP COMPONENT
s 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 solder adequately.
4. Do not reuse a chip part after removing it.
s SOLDERING IRON
1. Use a high insulation soldering iron with a thin pointed end
of it.
2. A 30W soldering iron is recommended for easily removing
parts.
s REPLACEMENT STEPS
1. How to remove Chip parts 2. How to install Chip parts
q Resistors, capacitors, etc. q Resistors, capacitors, etc.
(1) As shown in the figure, while pushing the chip part with twee- (1) Apply solder to the pattern as indicated in the figure.
zers, alternately melt the solder at its each end.
(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.
(2) Shift the chip part with tweezers and remove it.
q Transistors, diodes, variable resistors, etc. q Transistors, diodes, variable resistors, etc.
(1) Apply extra solder to each lead. (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 as indicated in the figure.
SOLDER SOLDER
A
(2) As shown in the figure, while pushing the chip part with twee- B
zers, alternately melt the solder at its each lead. Then, shift
and remove the chip part.
C
(4) Then solder leads B and C.
A
B
C
Note : After removing the part, remove remaining solder from
the pattern.
No. 56036 9
AV-21F8
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
1. There are 2 ways for adjusting this TV: One is with the 7. Preparation for adjustment (presetting):
REMOTE CONTROL UNIT and the other is the conventional Unless otherwise specified in the adjustment items, preset the
method using adjustment parts and components. following functions with the remote control unit.
2. The setting (adjustment) using the REMOTE CONTROL
UNIT is made on the basis of the initial setting values. The
Function Setting value
setting values which adjust the screen to the optimum con-
dition can be different from the initial setting values. PICTURE MODE (VSM) BRIGHT
3. Make sure that connection is correctly made to AC power source. COLOUR/BRIGHT/CONT./SHARP See "VSM Preset"
4. Turn on the power of the TV and measuring instrument for warm- on page 23.
ing up for at least 30 minutes before starting adjustment. OFF TIMER OFF
5. If the receive or input signal is not specified, use the most ap- ECO SENSOR OFF
propriate signal for adjustment. BLUE BACK OFF
6. Never touch parts (such as variable resistors, transformers and
PICTURE BOOSTER OFF
capacitors) not shown in the adjustment items of this service
adjustment.
MEASURING INSTRUMENT ADJUSTMENT/CHECK ITEMS
AND FIXTURES
Adjustment/Check item Page
1. DC voltmeter (or Digital voltmeter)
2. Oscilloscope
B1 POWER SUPPLY Check 14
3. Signal generator (Pattern generator) FOCUS Adjustment 14
[PAL / SECAM / NTSC]
4. Remote control unit
IF CIRCUIT Adjustment 14
V/C (VIDEO/CHROMA) CIRCUIT Adjustment 15
DEFLECTION CIRCUIT Adjustment 21
VSM PRESET 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:
q 1. IF ............................. For entering/adjusting the setting values (adjustment values) of the IF circuit.
q 2. V/C ........................... For entering/adjusting the setting values (adjustment values) of the VIDEO/CHROMA and DEFLECTION cir-
cuits.
q 3. VSM PRESET ......... For setting the values of STANDARD, SOFT and BRIGHT
(VSM: video status memory)
10 No. 56036
AV-21F8
3. BASIC OPERATION IN SERVICE MENU SERVICE MENU
(1) How to enter SERVICE MENU
Press the DISPLAY key and the PICTURE MODE key on SERVICE MENU
the remote control unit simultaneously.
The SERVICE MENU screen will be displayed. (See Fig. 1.) 1. IF 2. V/C
3. VSM PRESET
(2) Selection of SUB MENU SCREEN
Press one of the keys 1 ~ 3 on the remote control unit, and
select the SUB MENU SCREEN from the SERVICE MENU. 1-3 : SELECT DISP : EXIT
(See Fig. 2.) VVVVVVVV VVVVV VV.VVVV
VVV VVVVV VV.VVVV
SERVICE MENU SUB MENU 1. IF
Fig. 1
2. V / C
3. VSM PRESET
SUB MENU SCREEN
SERVICE MENU SUB MENU 1. IF
SERVICE MENU
IF VCO (CW) VVV.VV MHz
1. IF 2. V/C
3. VSM PRESET 1. VCO TOO HIGH
2. DELAY POINT ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
1-3 : SELECT DISP : EXIT
VVVVVVVV VVVVV VV.VVVV 1-2 : SELECT DISP : EXIT DISP : EXIT
VVV VVVVV VV.VVVV
DELAY POINT
AGC TAKE-OVER VV
- / + : OPERATE DISP : EXIT
SUB MENU 2. V/C
Setting item Setting item
V/C PAL
1. CUTOFF(R/G/B) 10. H. CENTER
2. DRIVE(R/B) 11. V. HEIGHT
1. CUTOFF (R) V VV 3. BRIGHT 12. V. LIN
(G) V VV 4. CONT. 13. V.S-CR
(B) V VV 5. COLOUR 14. V. CENTER
6. TINT (TV/VIDEO) 15. AMP T. SHARP
7. BLACK OFFSET(R-Y/B-Y)
50Hz
8. SHARP
a : SELECT
9. TEXT(RGB)CONT.
- / + : OPERATE DISP : EXIT
SUB MENU 3. VSM PRESET
BRIGHT / STD / SOFT
BRIGHT
Setting item
TINT VV
VV
TINT
COLOUR
VV
COLOUR
BRIGHT
VV
BRIGHT
CONT.
VV
CONT.
SHARP
SHARP
a : SELECT
- / + : OPERATE DISP : EXIT
Fig. 2
No. 56036 11
AV-21F8
(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 and 3. VSM PRESET
(a) 2 and 3 Keys ............................. Select 2. V/C and 3. VSM PRESET.
(b) MENU a key ........................ Select setting items.
(c) MENU - / + Key ......................... Adjust the setting values of the setting items.
q 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.
(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.
12 No. 56036
AV-21F8
ADJUSTMENT LOCATIONS
MAIN PWB
ON FRONT
TIMER ECO
POWER SENSOR VOL CH MENU
+ - + -
REMOCON
PW RECEIVER IC701
F901
S901 MEMORY
DEG IC
POWER SW
IC702
T
28 1
S IC201
29 56
HV
VCO T101
TU001 S1
5 1
HVT
U
1 Pin TP-91(B1)
UPPER : FOCUS
2 Pin NC
LOWER : SCREEN
3 Pin X-ray1
4 Pin X-ray2
5 Pin TP-E (")
CRT SOCKET PWB
(SOLDER SIDE)
TOP
TP-47G TP-E
E1
CRT EARTH
(BRAIDED ASS'Y)
T U
No. 56036 13
AV-21F8
ADJUSTMENTS
B1 POWER SUPPLY
Measuring Description
Item Test point Adjustment part
instrument
Check of Signal TP-91 (B1) 1. Receive a whole black signal.
B1 POWER Generator TP-E (")
" 2. Connect a DC voltmeter between TP-91 (B1) and TP-E (")
SUPPLY [S1 (between pins 1 and 5 of the connector S1).
DC Voltmeter connector] 3. Make sure that the voltage is DC114.5 ± 1.5V.
FOCUS ADJUSTMENT
Measuring Description
Item Test point Adjustment part
instrument
Adjustment Signal FOCUS VR 1. Receive a cross-hatch signal.
of FOCUS generator [In HVT] 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.
IF CIRCUIT ADJUSTMENT
Measuring Description
Item Test point Adjustment part
instrument
Adjustment Remote VCO (CW) q Under normal conditions, no adjustment is required.
of VCO (CW) control unit TRANSF. 1. Select 1. IF from the SERVICE MENU.
[MAIN PWB] 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
VCO (CW) VVV.VV MHz fv blue to yellow. (Step 1)
5. Then slowly turn the core of VCO(CW) TRANSF. counterclock-
TOO HIGH wise until the characters "ABOVE REFERENCE" changes from
ABOVE REFERENCE
YELLOW
blue to yellow. (Step 2)
BELOW REFERENCE
TOO LOW 6. Further slowly turn the core of VCO(CW) TRANSF. until the
colour of the characters "BELOW REFERENCE" changes from
DISP : EXIT
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.
Step
Screen display
1 2 3
TOO HIGH Yellow Blue Blue
ABOVE REFERENCE Blue Yellow Blue
BELOW REFERENCE Blue Blue Yellow
TOO LOW Blue Blue
14 No. 56036
AV-21F8
Measuring Description
Item Test point Adjustment part
instrument
Adjustment Remote DELAY POINT 1. Receive a black and white signal (colour off).
of DELAY control unit (AGC TAKE-OVER) 2. Select 1. IF from the SERVICE MENU.
POINT 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
Setting
Variable Initial setting screen.
(Adjustment)
range value 6. Turn to other channels and make sure that there are no irregu-
item
larities.
DELAY POINT
0 ~ 63 20
(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.
q Do not change the initial setting values of the setting (adjustment) items not listed in "ADJUSTMENT".
[SUB MENU 2. V/C (1. CUT OFF (R / G / B) ~ 9. TEXT (RGB) CONT. and 15. AMP SHARP)]
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 -64 ~ +63 -11 b b b
4. CONT. -58 ~ +28 -10 b b b
5. COLOUR -60 ~ +67 +7 +11 +12 -2
6. TINT TV / VIDEO -64 ~ +63 +5 / 0 -2 / 0
7. BLACK OFFSET (R-Y / B-Y) -8 ~ +7 0/0
8. SHARP TV / VIDEO -32 ~ +31 +10 / +8 b b b
9. TEXT (RGB) CONT. -128 ~ +127 +15 b b b
15. AMP T. SHARP -128 ~ +127 -15 b b b
: Do not adjust.
No. 56036 15
AV-21F8
Measuring
Item Test point Adjustment part Description
instrument
Adjustment q Signal 1. CUTOFF (R) 1. Receive a black and white signal (colour off).
of WHITE generator CUTOFF (G) 2. Select 2. V/C from the SERVICE MENU.
BALANCE CUTOFF (B) 3. Select 1. CUTOFF (R), (G) and (B) with MENU a key, and
(Low light) q Remote set each value to initial setting value with 4 ~ 9 keys on the
control SCREEN VR remote control unit.
unit (In HVT) 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
V/C PAL
it clockwise to where a red, blue, or green colour is faintly vis-
ible.
1. CUTOFF (R) V VV 6. Use keys 4 ~ 9 on the remote control unit and adjust the other
(G) V VV
2 colours to where the single horizontal line appears white.
(B) V VV
7. Turn the SCREEN VR to where the single horizontal line glows
50Hz faintly.
a : SELECT
8. Press the 2 key to return to 1. CUTOFF screen.
- / + : OPERATE DISP : EXIT
9. Press the DISPLAY key twice to return to the normal screen.
Setting (Adjustment) Variable Initial setting
item range value
REMOTE CONTROL UNIT
H.LINE OFF
R -128 ~ +127 0
1 2 3 1. CUT OFF G -128 ~ +127 0
H.LINE ON
B -128 ~ +127 0
G. CUTOFF ( )
4 5 6
R. CUTOFF ( ) B. CUTOFF ( )
R. DRIVE ( ) B. DRIVE ( )
7 8 9
R. CUTOFF ( ) B. CUTOFF ( )
R. DRIVE ( ) B. DRIVE ( )
G. CUTOFF ( )
Adjustment q Signal 2. DRIVE (R) 1. Receive a black and white signal (colour off).
of WHITE generator DRIVE (B) 2. Select 2. V/C from the SERVICE MENU.
BALANCE 3. Select 2. DRIVE (R) / (B) with MENU a key, and set each
(High light) q Remote value to initial setting value with 4 and 7 keys, or 6 and 9 keys
control on the remote control unit.
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
V/C PAL
item range value
2. DRIVE (R) V VV
(B) V VV
R -128 ~ +127 0
2. DRIVE
B -128 ~ +127 0
50Hz
a : SELECT
- / + : OPERATE DISP : EXIT
16 No. 56036
AV-21F8
Measuring Description
Item Test point Adjustment part
instrument
Adjustment Remote 3. BRIGHT 1. Receive any broadcast.
of control unit 2. Select 2. V/C from the SERVICE MENU.
SUB 3. Select 3. BRIGHT with the MENU a key.
BRIGHT 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.
Adjustment Remote 4. CONT. 1. Receive any broadcast.
of control unit 2. Select 2. V/C from the SERVICE MENU.
SUB CONT. 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.
Adjustment Remote 5. COLOR [Method of adjustment without measuring instrument]
of control unit
SUB
COLOUR-I PAL COLOUR (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 (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 (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. 56036 17
AV-21F8
Measuring Description
Item Test point Adjustment part
instrument
Adjustment q Signal TP-47G 5. COLOUR [Method of adjustment using measuring instrum