JVC AV-21PM User manual

AV-21PM
No. 56055 1
BASIC CHASSIS
CG-F
SERVICE MANUAL
COLOUR TELEVISION
AV-21PM
AV-21PM
COPYRIGHT  2000 VICTOR COMPANY OF JAPAN, LTD. No. 56055
Aug. 2000
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................................................................................................................................... 28
+−
+
−

AV-21PM
No. 560552
SPECIFICATIONS
Item Content
Dimensions (W ×H ×D) 596mm ×468.5mm ×481.5mm
Mass 25kg
TV RF System B / G, I, 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 ●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 32.0MHz (6.0MHz)
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 75ΩUnbalanced
Power Input AC110 ~ 240V, 50/60Hz
Power Consumption 116W (Max.) / 74W (Avg.)
Picture Tube Visible size : 51cm measured diagonally
High Voltage 28.0kV ±1.5kV (at zero beam current)
Speaker 5cm ×12cm Oval type ×2
Audio Output 5W (Monaural)
Input Video 1Vp-p, 75Ω
Audio 500mVrms (−4dBs), High impedance
Output Video 1Vp-p, 75Ω
Audio 500mVrms (–4dBs), Low impedance
Headphone Jack Stereo mini jack (3.5ø)
Remote Control Unit RM-C364-1H (Battery size : AA/R06/UM-3 ×2)
Design & specifications are subject to change without notice.

AV-21PM
No. 56055 3
SAFETY PRECAUTIONS
8. When service is required, observe the original lead dress. Ex-
tra precaution should be given to assure correct lead dress in
the high voltage circuit area. Where a short circuit has occurred,
those components that indicate evidence of overheating should
be replaced.Always use the manufacturer's replacement com-
ponents.
9. Isolation Check
(Safety for Electrical Shock Hazard)
After re-assembling the product, always perform an isolation
check on the exposed metal parts of the cabinet (antenna ter-
minals, video/audio input and output terminals, Control knobs,
metal cabinet, screw heads, earphone jack, control shafts, etc.)
to be sure the product is safe to operate without danger of elec-
trical shock.
(1) Dielectric Strength Test
The isolation between theAC primary circuit and all metal parts
exposed to the user, particularly any exposed metal part hav-
ing a return path to the chassis should withstand a voltage of
3000V AC (r.m.s.) for a period of one second.
(. . . . Withstand a voltage of 1100VAC (r.m.s.) to an appliance
rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated
200V or more, for a period of one second.)
This method of test requires a test equipment not generally
found in the service trade.
(2) Leakage Current Check
Plug the AC line cord directly into the AC outlet (do not use a
line isolation transformer during this check.). Using a "Leakage
Current Tester", measure the leakage current from each ex-
posed metal part of the cabinet, particularly any exposed metal
part having a return path to the chassis, to a known good earth
ground (water pipe, etc.).Any leakage current must not exceed
0.5mAAC (r.m.s.).
However, in tropical area, this must not exceed 0.2mA AC
(r.m.s.).
●Alternate Check Method
Plug the AC line cord directly into the AC outlet (do not use a
line isolation transformer during this check.). Use an AC volt-
meter having 1000 ohms per volt or more sensitivity in the fol-
lowing manner. Connect a 1500Ω10W resistor paralleled by a
0.15µF AC-type capacitor between an exposed metal part and
a known good earth ground (water pipe, etc.). Measure theAC
voltage across the resistor with the AC voltmeter. Move the
resistor connection to each exposed metal part, particularly any
exposed metal part having a return path to the chassis, and
measure the AC voltage across the resistor. Now, reverse the
plug in the AC outlet and repeat each measurement. Any volt-
age measured must not exceed 0.75V AC (r.m.s.). This corre-
sponds to 0.5mAAC (r.m.s.).
However, in tropical area, this mustnotexceed0.3VAC(r.m.s.).
This corresponds to 0.2mAAC (r.m.s.).
1. The design of this product contains special hardware, many
circuits and components specially for safety purposes. For con-
tinued protection, no changes should be made to the original
design unless authorized in writing by the manufacturer. Re-
placement parts must be identical to those used in the original
circuits. Service should be performed by qualified personnel
only.
2. Alterations of the design or circuitry of the products should not
be made. Any design alterations or additions will void the
manufacturer's warranty and will further relieve the manufac-
turer of responsibility for personal injury or property damage
resulting therefrom.
3. Many electrical and mechanical parts in the products have spe-
cial safety-related characteristics. These characteristics are of-
ten not evident from visual inspection nor can the protection
afforded by them necessarily be obtained by using replace-
ment components rated for higher voltage, wattage, etc. Re-
placement parts which have these special safety characteris-
tics are identified in the parts list of Service manual. Electrical
components having such features are identified by shad-
ing on the schematics and by (!) on the parts list in Ser-
vice manual. The use of a substitute replacement which does
not have the same safety characteristics as the recommended
replacement part shown in the parts list of Service manual may
cause shock, fire, or other hazards.
4. Don't short between the LIVE side ground and ISOLATED
(NEUTRAL) side ground or EARTH side ground when re-
pairing.
Some model's power circuit is partly different in the GND. The
difference of the GND is shown by the LIVE : (#) side GND,
the ISOLATED (NEUTRAL) : (") side GND and EARTH : ($)
side GND. Don't short between the LIVE side GND and ISO-
LATED (NEUTRAL) side GND or EARTH side GND and never
measure with a measuring apparatus (oscilloscope etc.) the
LIVE side GND and ISOLATED (NEUTRAL) side GND or
EARTH side GND at the same time.
If above note will not be kept, a fuse or any parts will be bro-
ken.
5. If any repair has been made to the chassis, it is recommended
that the B1 setting should be checked or adjusted (See AD-
JUSTMENT OF B1 POWER SUPPLY).
6. The high voltage applied to the picture tube must conform with
that specified in Service manual. Excessive high voltage can
cause an increase in X-Ray emission, arcing and possible com-
ponent damage, therefore operation under excessive high volt-
age conditions should be kept to a minimum, or should be pre-
vented. If severe arcing occurs, remove theAC power immedi-
ately and determine the cause by visual inspection (incorrect
installation, cracked or melted high voltage harness, poor sol-
dering, etc.). To maintain the proper minimum level of soft X-
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-
age meter or a high voltage probe with a VTVM. Discharge the
picture tube before attempting meter connection, by connect-
ing a clip lead to the ground frame and connecting the other
end of the lead through a 10kΩ2W resistor to the anode but-
ton.
AC VOLTMETER
(HAVING 1000Ω/V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
METAL PART
1500Ω10W
0.15µF AC-TYPE
GOOD EARTH GROUND

AV-21PM
No. 560554
FEATURES
●New chassis design enables use of an interactive on-
screen control.
●Wide range voltage for AC power input.
●With AUDIO / VIDEO INPUT & OUTPUT terminals.
●MUTING button can reduce the audio level to zero in-
stantly.
●Functional remote control to operate TV set (for channel
select, volume control, power ON/OFF, etc.) from a dis-
tance.
●I2C bus control utilizes single chip ICs for IF, V/C (Video/
Chroma) and VSM (Video Status Memory).
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE
REMOVING THE REAR COVER
1. Unplug the AC power cord.
2. Remove the 7 screws marked "A" and 1 screw marked "B".
(See Fig. 2 on the next page.)
3. Withdraw the rear cover backward.
REMOVING THE PB BASE
●After removing the rear cover.
1. Slightly raise both sides of the PB Base by hand and remove
the 2 claws under both sides of the PB Base from the front
cabinet. (See Fig. 2.)
2. Withdraw the PB Base backward.
(If necessary, take off the wire clamp, connectors etc.)
REMOVING THE CONTROL BASE
●After removing the Rear Cover and the PB Base.
1. While pushing down the claws marked "C", remove the Control
Base forward (in the arrow direction marked "D"). (See Fig. 1.)
(If necessary, take off the wire clamp, connectors, etc.)
REMOVING THE SPEAKER
●After removing the rear cover.
1. Remove the Speaker block by removing the 2screws marked
"E" . (See Fig. 2.)
2. Remove the Speaker by removing the 4screws marked "F".
(See Fig. 2.)
3. Follow the same steps 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 PB Base. (Refer to "REMOVING THE PB BASE".)
2. Erect the PB Base vertically so that you can easily check the
back side of the Main PW Board.
CAUTION:
●When erecting the PB Base, be careful so that there will be no
contacting with other PW Board.
●Before turning on power, make sure that the CRT earth wire
and other connectors are properly connected.
●When repairing, connect the Deg. coil to the DEG. connector
on the Main PW Board.
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.
Fig. 1
CONTROL BASE
[FRONT SIDE]
PB BASE
C
D
●By means of AUTO PROGRAM, the TV stations can be
selected automatically and the TV channels can also be
rearranged automatically.
●Built-in ECO MODE (ECONOMY, ECOLOGY)
In accordance with the brightness in a room, the bright-
ness and/or contrast of the picture can be adjusted auto-
matically to make the optimum picture which is easy on
the eye.
●Built-in ON TIMER & RETURN +.

AV-21PM
No. 56055 5
Fig. 2
CRT SOCKET
PWB
FRONT CABINET
FRONT CONTROL PWB
CONTROL BASE
CLAW
CLAW
MAIN PWB
PB BASE
F(×4) SPEAKER
E
(×2)
Fig. 1
E
(×2)
(×4)
F
SPEAKER
REAR COVER
A(×7) B

AV-21PM
No. 560556
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 whetherthesetting values of theSYSTEMCON-
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
3. DEF
5. PRESET
6.TURBOTIMER OFF
2. V/C
4. VSM PRESET
SERVICE MENU
1-6 : SELECT DISP : EXIT
✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
+−
+
−
POWER
PICTURE
MODE
SYSTEM
ECO
SENSOR
COLOUR SOUND
TV/VIDEO
OFF
TIMER
CHANNEL
SCAN
DISPLAY
1
456
23
78
0
9
RETURN+ -/- -
MUTING
MENU
CHANNEL VOLUME
I / II
PICTURE
MODE
MENU
MENU +
MENU
DISPLAY
MENU –
COLOUR : MULTI
BILINGUAL : NO
TUNER : MU
ECO SENSOR :YES
LANGUAGE : E / R / A / F
SYSTEM CONSTANT - I
SYSTEM CONSTANT SET 1/3
B/B SOUND : OFF
LOCK : 180
COLOUR AUTO : NO
QSS : MINT
ALC : NO
TEXT RATE : 20
SYSTEM CONSTANT - II
SYSTEM CONSTANT SET 2/3
−/+: OPERATE DISP : EXIT
− / + : OPERATE DISP : EXIT
Fig. 2
a: SELECT
a: SELECT
AMP TUNER : NO
VNR : YES
EW-PIN IC : YES
SYSTEM CONSTANT - III
SYSTEM CONSTANT SET 3/3
−/+: OPERATE DISP : EXIT
a: SELECT

AV-21PM
No. 56055 7
Setting item Setting contents Setting value
COLOUR MULTI
BILINGUAL NO
TUNER MU
ECO SENSOR YES
LANGUAGE E/R/A/F
B/B SOUND OFF
LOCK 180
COLOUR AUTO NO
QSS MINT
ALC NO
TEXT RATE 20
AMP TUNER NO
VNR YES
EW-PIN IC YES
MULTI. TRIPLE PAL
YES NO
MU MA
YES NO
E/R/A/F E/A/F E/A E/F
ON OFF
YES 10 20 ... 230
250 240
YES NO
MINT MQSS
YES NO
10 20 40 80
YES NO
YES NO
YES NO
Setting item Setting value Setting item Setting value
SUB POWER ON PICTURE MODE (VSM) BRIGHT
CHANNEL POSITION 1 POSITION VNR OFF
OFF TIMER OFF
LANGUAGE ENGLISH
VOLUME Appropriate sound volume AUTO SHUTOFF OFF
TV/VIDEO TV ECO SENSOR OFF
ON SCREEN DISPLAY POSITION NUMBER DISPLAY BLUE BACK OFF
COLOUR SYSTEM AUTO PAL ON TIMER PR1 0:00
SOUND SYSTEM B / G CHILD LOCK OFF
SETTING OF SYSTEM CONSTANT SET
Table 1
USER SETTING VALUES
Table 2
Refer to OPERATING
INSTRUCTION
CHANNEL PRESET

AV-21PM
No. 560558
Service menu Setting item
5. PRESET 1. C-TRAP FIX
2. SHARP PEAK
3. ABL
4. GAMMA
5. Y.DELAY TIME
6. BLACK EXP START
7. C-BPF
8. CW/SCP
9. V.IF DET. LEVEL
10. S.IF DET. LEVEL
11. IF AGC MIN.
12. V.IF AGC
13. V.IF PMOD
14. S.IF BPF BW ADJUST
15. S.IF TRAP FO ADJUST
16. S.IF TRAP FO ADJUST 2
17. S.IF-TRAP
18. S.IF-BPF
19. VNR
20. RGB LIM.
21. RGB LIMIT LEVEL
22. S.IF SW
23. TEXT H. POSITION
24. READ DATA
6. 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 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 (P / S/ N3 / N4)
6. TINT (N3 / N4)
7. SECAM BLADJ
8. SHARP (TV / VIDEO)
3. DEF 1. VER. POSITION
2. HOR. POSITION
3. VER. HEIGHT
4. VER. LINEARITY
5. VER. SCURVE
6. HOR. VCO ADJUST
7. HOR. WIDTH
8. EW-PIN
9. EW-CORNER
10. TRAPEZ
11. VER. EDGE
12. HOR. COMP
13. VER. POS2
4. VSM PRESET TINT
(BRIGHT/STD/SOFT) COLOUR
BRIGHT
CONT.
SHARP
SERVICE MENU SETTING ITEMS
Table 3
Do not adjust.
Do not adjust.
Do not adjust.
Do not adjust.
Do not adjust.

AV-21PM
No. 56055 9
■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.
■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.
■REPLACEMENT STEPS
1. How to remove Chip parts
● Resistors, capacitors, etc.
(1) As shown in the figure, while pushing the chip part with twee-
zers, alternately melt the solder at its each end.
(2) Shift the chip part with tweezers and remove it.
●Transistors, diodes, variable resistors, etc.
(1) Apply extra solder to each lead.
(2) As shown in the figure, while pushing the chip part with twee-
zers, alternately melt the solder at its each lead. Then, shift
and remove the chip part.
Note : After removing the part, remove remaining solder from
the pattern.
REPLACEMENT OF CHIP COMPONENT
2. How to install Chip parts
●Resistors, capacitors, etc.
(1) Apply solder to the pattern as indicated in the figure.
(2) Grasp the chip part with tweezers and place it on the solder.
Then heat and melt the solder at both ends of the chip part.
●Transistors, diodes, variable resistors, etc.
(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 Aas indicated in the figure.
(4) Then solder leads Band C.
SOLDER SOLDER
A
B
C
A
B
C

AV-21PM
No. 5605510
SERVICE ADJUSTMENTS
BEFORE STARTING SERVICE ADJUSTMENT
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. DEF ......................... For entering/adjusting the setting values (adjustment values) of the DEFLECTION circuit.
●4. VSM PRESET ......... For setting the values of STANDARD, SOFT and BRIGHT. (Do not adjust the preset values.)
(VSM: video status memory)
●5. PRESET .................. For setting the values for VIDEO/CHROMA control. (Do not adjust the preset values.)
●6. 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 surethatconnection is correctly madetoACpowersource.
4. Turnon the power of theTV and measuringinstrumentforwarm-
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
OFF TIMER
ECO SENSOR
BLUE BACK
Setting value
BRIGHT
See "VSM Preset"
on page 23.
OFF
OFF
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 CIRCUITAdjustment 14
V/C (VIDEO/CHROMA) CIRCUITAdjustment 15
DEFLECTION CIRCUIT Adjustment 20
VSM PRESETAdjustment 23
PRESET Adjustment 24
PURITY, CONVERGENCE Adjustment 25

AV-21PM
No. 56055 11
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 ~ 6 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. DEF
4. VSM PRESET
5. PRESET
6. 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) . ................................ Adjust VCO(CW) while watching the colour (yellow/blue) of the characters on the screen.
For details, refer to the adjustment table.
(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. DEF, 4. VSM PRESET and 5. PRESET
Note: Do not adjust "4. VSM PRESET" and "5. PRESET" unless you had changed its value by mistake.
(a) 2 ~ 5 Keys ................................. Select one from 2. V/C, 3. DEF, 4. VSM PRESET and 5. PRESET.
(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) 6. TURBO TIMER
(a) 6 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.
Fig. 1
SERVICE MENU
1. IF
3. DEF
5. PRESET
6.TURBOTIMER OFF
2. V/C
4. VSM PRESET
SERVICE MENU
1-6 : SELECT DISP : EXIT
✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽

AV-21PM
No. 5605512
SUB MENU SCREEN
Fig. 2
SERVICE MENU
1.VCO
2. DELAY POINT
1-2 : SELECT DISP : EXIT
IF
SUB MENU 1. IF
VCO (CW) ✽✽✽.✽✽ MHz
TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST ✽✽✽
VCO ADJUST ✽✽✽
FINE 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 (P / S/ N3 / N4)
6. TINT (N3 / N4)
7. SECAM BL ADJ
8. SHARP (TV / VIDEO)
PAL
1. CUTOFF (R)
✽ ✽✽
(G) ✽ ✽✽
− / + : OPERATE DISP : EXIT
(B)
✽ ✽✽
a: SELECT
V/C
SUB MENU 2.V/C
−/+: OPERATE DISP : EXIT
a: SELECT
DEF.
SUB MENU 3. DEF
1. VER. POSITION ✽✽✽
50Hz / 60Hz
Setting item
1. IF
3. DEF
5. PRESET
6.TURBOTIMER OFF
2. V/C
4. VSM PRESET
SERVICE MENU
1-6 : SELECT DISP : EXIT
✽✽✽✽✽✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
✽✽✽ ✽✽✽✽✽ ✽✽.✽✽✽✽
6 .TURBOTIMER
TURBOTIMER OFF
ON
50Hz
50Hz
BRIGHT
SUB MENU 4.VSM PRESET
a: SELECT
− / + : OPERATE DISP : EXIT
TINT ✽✽✽
COLOUR ✽✽✽
BRIGHT ✽✽✽
CONT. ✽✽✽
SHARP ✽✽✽
PRESET PAL
SUB MENU 5. PRESET
a: SELECT
− / + : OPERATE DISP : EXIT
1. C-TRAP FIX
✽✽✽
50Hz B/G
BRIGHT / STD / SOFT
50Hz / 60Hz
Setting item
1. VER. POSITION
2. HOR. POSITION
3. VER. HEIGHT
4. VER. LINEARITY
5. VER. SCURVE
6. HOR. VCO ADJUST
7. HOR. WIDTH
8. EW-PIN
9. EW-CORNER
10. TRAPEZ
11. VER. EDGE
12. HOR. COMP
13. VER. POS2
Do not adjust.
Do not adjust.
Do not adjust.
Do not adjust.

AV-21PM
No. 56055 13
ADJUSTMENT LOCATIONS
CRT SOCKET PWB
(SOLDER SIDE)
U
P
TP-E( )
TP-47G
E
CRT EARTH
(BRAIDED ASS'Y)
TOP
F901
PW
DEG
FRONT CONTROL PWB
FRONT
POWER
SW SL
SR
1 Pin TP-91(B1)
2 Pin NC
3 Pin X-RAY1
4 Pin X-RAY2
5 Pin TP-E ( )
MAIN PWB
IC702
MEMORY IC
IC701
TUNER
W
HV
FRONT
AV
IN/OUT
HVT
S1
S1
IC301
U
P
1
5
CN002 CN003
W
MICRO PROCESSOR
CN002 CN003

AV-21PM
No. 5605514
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 DC135.0 ±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.
ADJUSTMENTS
B1 POWER SUPPLY
Measuring
Item Test point Adjustment part
instrument
Check of ●Signal TP-91 (B1)
B1 POWER Generator TP-E (""
""
")
SUPPLY ●DC [S1
Voltmeter connector]
Measuring
Item Test point Adjustment part
instrument
Adjustment Signal FOCUS VR
of FOCUS generator [In HVT]
FOCUS ADJUSTMENT
IF CIRCUIT ADJUSTMENT
Measuring
Item Test point Adjustment part
instrument
Adjustment Remote VCO (CW)
of VCO (CW) control unit
Description
●Under normal conditions, no adjustment is required.
Note: Do not adjust without inputting signal.
1. Receive a colour bar signal.
2. Select 1. IF from the SERVICE MENU.
3. Press the 1key to select 1. VCO.
4. Select VCOADJUST with the MENU akey and make sure
that the setup value shown in the screen is +00.
5. Press the MENU −or +key until the colour of the characters
"TOO HIGH" displayed on the screen changes from blue to
yellow.
6. Press the MENU −or +key until the colour of the characters
"TOO LOW" displayed on the screen changes from blue to
yellow. At this time, check that the value of VCO ADJUST on
the screen is +00 or about +00.
7. Select AFT ADJUST with the MENU akey.
8. Then, press the MENU −or +key until the colour of the char-
acters "JUST REFERENCE" displayed on the screen changes
from blue to yellow.
9. Press the DISPLAY key three times to return to normal screen.
VCO (CW) ✽✽✽.✽✽ MHz
TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
AFT ADJUST
✽✽✽
VCO ADJUST ✽✽✽
FINE DISP : EXIT
fv
YELLOW
Do not adjust.

AV-21PM
No. 56055 15
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.
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]
Variable Initial setting
range value
Setting (Adjustment) Item
DELAY POINT
(AGC TAKE-
OVER)
NTSC3.58
Others 0~127 48
43
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 −50 bbb
2. DRIVE (R / B) −64 ~ +63 0 bbb
3. BRIGHT −128 ~ +127 0 bbb
4. CONT. −64 ~ +63 0 bbb
5. COLOUR (P / S / N3 / N4) −64 ~ +63 0 bbb
6. TINT (N3 / N4) TV / VIDEO −64 ~ +63 0 / 0 0 / 0
7. SECAM BL ADJUST −32 ~ +31 0 bbb
8. SHARP TV / VIDEO −32 ~ +31 −14 / +8bbb
: Do not adjust.

AV-21PM
No. 5605516
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 the 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−64 ~+63 0
2. DRIVE B−64 ~+63 0
Setting (Adjustment) Variable Initial setting
item range value
R−128 ~+127 −50
1. CUT OFF G −128 ~+127 −50
B−128 ~+127 −50
PAL
1. CUTOFF (R)
✽ ✽✽
(G) ✽ ✽✽
− / + : OPERATE DISP : EXIT
(B)
✽ ✽✽
a: SELECT
V/C
50Hz
12 3
4
789
56
R. CUTOFF ( )
G. CUTOFF ( )
H.LINE OFF
H.LINE ON
R. CUTOFF ( )
R. DRIVE ( )
R. DRIVE ( )
G. CUTOFF ( )
B. CUTOFF ( )
B. DRIVE ( )
B. CUTOFF ( )
B. DRIVE ( )
REMOTE CONTROL UNIT
PAL
2. DRIVE (R)
✽ ✽✽
− / + : OPERATE DISP : EXIT
a: SELECT
V/C
50Hz
(B)
✽ ✽✽

AV-21PM
No. 56055 17
Measuring
Item Test point Adjustment part
instrument
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-IPAL COLOUR
SECAM COLOUR
NTSC 3.58 COLOUR
Description
1. Receive any broadcast.
2. Select 2. V/C from the SERVICE MENU.
3. Select 3. BRIGHT with the MENU akey.
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 akey.
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 akey.
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)
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.

AV-21PM
No. 5605518
Measuring
Item Test point Adjustment part
instrument
Adjustment ●Signal TP-47G 5. COLOUR
of SUB generator TP-E (""
""
")
COLOUR-II [CRT
●Oscillo- SOCKET PAL COLOUR
scope PWB]
●Remote
control
unit
SECAM COLOUR
NTSC 3.58 COLOUR
Adjustment Remote 6. TINT
of control unit
SUB TINT-INTSC 3.58 TINT
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 akey.
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 theinitialsettingvalue of SECAMCOLOURwiththe MENU
−or +key.
3. Adjust SECAM COLOUR to set the value (A) in the figure to
+13V (W & G).
(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 +8V (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.
[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 akey.
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 val-
ues are automatically set for NTSC 4.43 TINT.
Mg B
(−)
0V
(+)
R
Cy
Y
WG
(A)

AV-21PM
No. 56055 19
Measuring
Item Test point Adjustment part
instrument
Adjustment ●Signal TP-47G 6. TINT
of generator TP-E (""
""
")
SUB TINT-II [CRT
●Oscillo- SOCKET NTSC 3.58 TINT
scope PWB]
●Remote
control
unit
Adjustment Remote
of BLACK control unit
OFFSET
(SECAM) 7. SECAM BL
ADJUST
Description
[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
+5V (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 val-
ues are automatically set for NTSC 4.43 TINT.
[Method of adjustment without measuring instrument]
1. Receive a SECAM HALF COLOUR BAR signal (210.25MHz).
2. Select 2. V/C from the SERVICE MENU.
3. Select 7. SECAM BL ADJUST with the MENU a key.
4. Set the initial setting value the MENU - or + key.
5. While alternately pressing keys 1(Black & White ON) and 2
(Black & White OFF), make sure that there is no colour on the
black & white screen.
6. If the black & white screen is not the best with the initial set-
ting value, make fine adjustment until you get the best black
& white screen.
7. Press the DISPLAY key twice to return to the normal screen.
Mg B
(−)
0V
(+)
R
Cy
Y
W
(B)
G
REMOTE CONTROL UNIT
BLACK &
WHITE ON
BLACK &
WHITE OFF 12 3
4
789
56

AV-21PM
No. 5605520
Measuring
Item Test point Adjustment part
instrument
Adjustment ●Signal 1. VER. POSITION
of generator
V-POSITION ●Remote
control
unit
Description
[ fv : 50Hz mode]
1. Receive a circle pattern signal.
2. Select 3. DEF from the SERVICE MENU.
3. Select 1. VER. POSITION with the MENU akey.
4. Set theinitial setting valueof 1. VER. POSITION with theMENU
−/ +key.
5. Adjust VER. POSITION to make V = V'.
(to be continued)
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 3. DEF]
HH'
V
V'
Initial setting value
Setting item Adjustment name Variable range 50Hz 60Hz
1. VER. POSITION Vertical center −4 ~ +3−2−2
2. HOR. POSITION Horizontal center −16 ~ +15 −1 +1
3. VER. HEIGHT Vertical height −64 ~ +63 +13 −2
4. VER. LINEARITY Vertical linearity −16 ~ +15 +7 0
5. VER. SCURVE Vertical scurve −16 ~ +15 −5 0
6. HOR. VCO ADJUST Horizontal VCO −64 ~ +63 0 0
7. HOR. WIDTH Horizontal width −32 ~ +31 −1 −5
8. EW-PIN Side pin correction −32 ~ +31 −5 0
9. EW-CORNER Side pin fore correction −8 ~ +7 −3 +2
10. TRAPEZ Trapezoidal distortion correction −32 ~ +31 −13 −5
11. VER. EDGE Vertical edge correction −8 ~ +7 0 0
12. HOR. COMP Horizontal compensation −8 ~ +7 −2 −2
13. VER. POS2 Vertical center 2 −4 ~ +3 0 0
: Do not adjust.