JVC AV-21L91, AV-25L91, AV-29L91 Schematic
SERVICE MANUAL
COLOUR TELEVISION
AV-21L91
AV-25L91
AV-29L91
BASIC CHASSIS
CH
DISPLAY
CHANNEL VOLUME
SYSTEM
COLOUR
SOUND MUTING
TV/VIDEO
I/II
PICTURE MODE
RETURN
CHANNEL SCAN
ECO SENSOR
RM-C353 REMOTE CONTROL UNIT
POWER
MENU
123
456
7809
OFF TIMER
-/--
[AV-21L91
, AV-25L91
(-BK)
DISPLAY
CHANNEL VOLUME
SYSTEM
COLOUR
SOUND MUTING
TV/VIDEO
I/II
PICTURE MODE
RETURN
CHANNEL SCAN
ECO SENSOR
RM-C353 REMOTE CONTROL UNIT
MENU
123
456
7809
(-BK)
(-BK)
(-BK)
POWER
-/--
OFF TIMER
AV-21L91
AV-25L91
AV-29L91
RM-C353-1CRM-C353-1C
] [AV-29L91
(-BK)
(-BK)
]
tu2522 086-5306051 087-4915026
COPYRIGHT © 2001 VICTOR COMPANY OF JAPAN, LTD.
No. 51898
Nov. 2001
AV-21L91
AV-25L91
AV-29L91
SPECIFICATIONS
Items
Dimensions (W × H × D)
Mass 24kg 30kg 47kg
TV RF System B, G, I, D, K, M
Colour System TV Mode PAL / SECAM / NTSC3.58 / NTSC4.43
VIDEO Mode PAL / SECAM / NTSC3.58 / NTSC4.43
Stereo System A2 NICAM
Receiving Frequency VHF (VL) 43.75MHz – 142.25MHz 46.25MHz – 140.25MHz
VHF (VH) 142.28MHz – 428.75MHz 147.25MHz – 423.25MHz
UHF 428.78MHz – 865.75MHz 431.25MHz – 863.25MHz
CATV ● Cable TVs of Mid (X-Z, S1-S10)
Intermediate VIF Carrier 38.0MHz
Frequency 31.5MHz (6.5MHz)
SIF Carrier 32.0MHz (6.0MHz)
Colour Sub Carrier Frequency PAL (4.43MHz), SECAM (4.40625MHz / 4.25MHz)
Aerial Input Terminal 75Ø Unbalanced
Power Input AC110 – 240V, 50 / 60Hz
Power Consumption 115W
Picture Tube (Vsible size) 51cm measured diagonally 60cm measured diagonally 68cm measured diagonally
High Voltage (at cut-off in service mode)
Speaker 5 × 12cm Oval type ×2
Audio Output 5W + 5W 7W + 7W
Video / Audio Input (1 / 2 / 3) Video(1,3) : 1Vp-p, 75Ø (RCA pin jack)
AV-21L91-BK
59.8cm × 46.8cm × 47.15cm 68.2cm × 53.84cm × 47.75cm 73.2cm × 58.8cm × 51.8cm
Super (S11-S20) & Hyper (S21-S41) bands receivable
32.5MHz (5.5MHz)
NTSC (3.58MHz / 4.43MHz)
(Max.)
/ 75W
(Avg.)
29kV ± 1kV 31kV ± 1kV 32kV +1/–1.5kV
Audio(1,2,3) : 500mVrms ( -4dBs ), High Impedance (RCA pin jack)
Component Input ( Input 2 )
Y : 1Vp-p positive (negative sync provided, when terminated with 75Ø)
CB/CR : 0.7Vp-p 75Ø
150W (Max.) / 90W (Avg.) 172W(Max.)/108W(Avg.)
Contents
AV-25L91-BK
AV-29L91-BK
Video/Audio Output 1Vp-p, 75Ø (RCA pin jack)
500mVrms(-4dBs)
Low impedance (400Hz when modulated 100%) (RCA pin jack)
Headphone Jack Stereo mini jack (3.5φ)
Remote Control Unit RM-C353-1C
(Battery size: AA/R06/UM-3 × 2)
Design & specifications are subject to change without notice.
2 No. 51898
SAFETY PRECAUTIONS
AC VOLTMETER
(HAVING 1000Ω/V,
OR MORE SENSITIVITY)
PLACE THIS PROBE
ON EACH EXPOSED
ME TAL PART
1500Ω 10W
0.15µF AC-TYPE
GOOD EARTH GROUND
1. The design of this product contains special hardware, many circuits
and components specially for safety purposes. For continued protection, no changes should be made to the original design unless
authorized in writing by the manufacturer. Replacement 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 manufacturer of responsibility for personal injury or property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special
safety-related characteristics. These characteristics are often not
evident from visual inspection nor can the protection afforded by
them necessarily be obtained by using replacement components
rated for higher voltage, wattage, etc. Replacement parts which have
these special safety characteristics are identified in the parts list of
Service manual. Electrical components having such features are
identified by shading on the schematics and by (!) on the parts
list in Service 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 (NEU-
TRAL) side ground or EARTH side ground when repairing.
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 ISOLATED (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 broken.
5. If any repair has been made to the chassis, it is recommended that
the B1 setting should be checked or adjusted (See ADJUSTMENT
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 component damage, therefore operation under excessive high voltage conditions
should be kept to a minimum, or should be prevented. If severe
arcing occurs, remove the AC power immediately and determine
the cause by visual inspection (incorrect installation, cracked or
melted high voltage harness, poor soldering, etc.). To maintain the
proper minimum level of soft X-Ray emission, components in the
high voltage circuitry including the picture tube must be the exact
replacements or alternatives approved by the manufacturer of the
complete product.
AV-21L91
AV-25L91
AV-29L91
8. When service is required, observe the original lead dress. Extra
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 components.
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 terminals, 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 electrical shock.
(1) Dielectric Strength Test
The isolation between the AC primary circuit and all metal parts
exposed to the user, particularly any exposed metal part having 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 1100V AC (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 exposed 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 0.5mA AC (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 voltmeter having 1000 ohms per volt or more sensitivity in the following manner.
Connect a 1500Ø 10W resistor paralleled by a 0.15µF AC-type capacitor between an exposed metal part and a known good earth
ground (water pipe, etc.). Measure the AC 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 voltage measured must not exceed 0.75V AC
(r.m.s.). This corresponds to 0.5mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.3V AC (r.m.s.).
This corresponds to 0.2mA AC (r.m.s.).
7. Do not check high voltage by drawing an arc. Use a high voltage
meter or a high voltage probe with a VTVM. Discharge the picture
tube before attempting meter connection, by connecting a clip lead
to the ground frame and connecting the other end of the lead through
a 10kØ 2W resistor to the anode button.
No. 51898 3
AV-21L91
AV-25L91
AV-29L91
FEATURES
s New chassis design enables use of an interactive on-screen control.
s Pure flat CRT produces fine textured picture in every detail.
s Wide range voltage (110V ~ 240V) for AC power input.
s With AUDIO/VIDEO/COMPONENT input terminals.
s I 2 C bus control utilizes single chip ICs.
s By means of AUTO PROGRAM, the TV stations can be selected
automatically and the TV channels can also be rearranged automatically.
s Built-in DIGITAL 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.
s Built-in OFF TIMER & RETURN +.
4 No. 51898
FUNCTIONS
a FRONT PANEL
[AV-21L91-BK, AV-25L91-BK]
[AV-29L91-BK]
L/MONOVR
IN (VIDEO-3)
AV-21L91
AV-25L91
AV-29L91
a REAR PANEL
VIDEO-1
INPUT
V
L
/
MONO
R
COMPONENT
(
VIDEO-2
INPUT
Y
/
V
C
B
L
/
RRC
R
)
MONO
OUTPUT
V
L
a REMOTE CONTROL UNIT
RM-C353-1C
DISPLAY
CHANNEL VOLUME
SYSTEM
SOUND MUTING
COLOUR
TV/VIDEO
I/II
PICTURE MODE
RETURN
CHANNEL SCAN
ECO SENSOR
RM-C353 REMOTE CONTROL UNIT
POWER
MENU
123
456
7809
-/--
OFF TIMER
No. 51898 5
AV-21L91
AV-25L91
SPECIFIC SERVICE INSTRUCTIONS
DISASSEMBLY PROCEDURE [AV-21L91-BK, AV-25L91-BK]
REMOVING THE REAR COVER
1. Unplug the AC power cord.
2. Remove the 7 or 9 screws marked Å and 4 screws maked ı as
shown in Fig.1.
3. Withdraw the Rear cover toward you.
[CAUTION]
When reinstalling the rear cover, carefully push it inward after in-
•
serting the Main PWB into the rear cover groove.
REMOVING THE MAIN PW BOARD
After removing the rear cover.
•
1. Slightly raise the both sides of the Main PWB by hand, take off the
PB stopper marked
2. Withdraw the Main PWB backward.
(If necessary, take off the wire clamp and connectors, etc.)
from the front cabinet.
Ç
REMOVING THE SPEAKER
After removing the rear cover.
•
1. Remove the 2 screws marked Î and 2 screws maked ´ as shown
in Fig.1.
2. Follow the same steps when removing the other hand speaker.
CHECKING THE MAIN PW BOARD
1. To check the back side of the Main PWB.
1) Pull out the Main PWB. (Refer to REMOVING THE MAIN PW
BOARD).
2) Erect the Main PWB vertically so that you can easily check its
back side.
[CAUTION]
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 PWB.
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.
6 No. 51898
FRONT CABINET
PICTURE TUBE
E
(×2)
SPEAKER
CRT SOCKET PWB
MAIN PWB
AV-21L91
AV-25L91
D
(×2)
E
(×2)
SPEAKER
D
(×2)
REAR COVER
Except 21”
model
C
PB STOPPER
(×7) [AV-21L91-BK]
A
(×9) [AV-25L91-BK]
Except 21” model
(×4)
B
Fig.1
No. 51898 7
AV-29L91
DISASSEMBLY PROCEDURE [AV-29L91-BK]
REMOVING THE REAR COVER
1. Unplug the AC power cord.
2. Remove the 16 screws marked
3. Withdraw the Rear cover toward you.
[CAUTION]
When reinstalling the rear cover, carefully push it inward after in-
•
serting the Main PWB into the rear cover groove.
as shown in Fig.2.
Å
REMOVING THE CHASSIS (CHASSIS BASE AND
CONTROL BASE)
After removing the rear cover.
•
1. Slightly raise the both sides of the chassis by hand and remove the
2 claws marked
in Fig.2.
2. Withdraw the chassis backward.
(If necessary, take off the wire clamp, connector’s etc.)
When conducting a check with power supplied, be sure to confirm
*
that the CRT earth wire is connected to the CRT Socket PWB and
the Main PWB.
under the chassis from the front cabinet as shown
ı
REMOVING THE AV TERMINAL BOARD
After removing the rear cover.
•
1. Remove the 4 screws marked Ç as shown in Fig.2.
2. When you pull out the AV Terminal board in the direction of arrow
marked Î as shown in Fig.2, it can be removed.
CHECKING THE MAIN PW BOARD
1. To check the back side of the Main PWB.
1) Pull out the chassis. (Refer to REMOVING THE CHASSIS).
2) Erect the chassis vertically so that you can easily check the back
side of the Main PWB.
[CAUTION]
When erecting the chassis, be careful so that there will be no con-
•
tacting 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 PWB.
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.
REMOVING THE CONTROL BASE
After removing the rear cover and the chassis.
•
1. While pushing down the 2 claws maked ´ as shown in Fig. 3.
2. When you pull out the Control base in the direction of arrow maked
as shown in Fig. 3.
Ï
(If necessary, take off the wire, connector’s etc.)
REMOVING THE SPEAKER
After removing the rear cover.
•
1. Remove the 4 screws marked ˝ as shown in Fig.2.
2. Withdraw the speaker backward.
3. Follow the same steps when removing the other hand speaker.
8 No. 51898
AV-29L91
FRONT CABINET
FRONT CONTROL
PWB (1/2)
(×4)
G
SPEAKER
CONTROL BASE
PICTURE TUBE
CRT
SOCKET
PWB
Fig.3
G
SPEAKER
(×4)
FRONT CONTROL PWB (2/2)
MAIN PWB
CLAW B
AV TERMINAL
BOARD
REAR COVER
CHASSIS
BASE
A
(×4)
A
CLAW B
(×1)
A
(×1)
D
C
(×4)
(×4)
A
(×6)
A
[FRONT SIDE]
CONTROL BASE
F
CHASSIS
BASE
Fig.3
E
Fig.2
No. 51898 9
AV-21L91
AV-25L91
AV-29L91
REMOVING THE CRT
* Replacement of the CRT should be performed by 2 or more persons.
After removing the rear cover, chassis etc.,
•
1. Putting the CRT change table on soft cloth, the CRT change table
should also be covered with such soft cloth (shown in Fig. 4).
2. While keeping the surface of CRT down, mount the TV set on the
CRT change table balanced will as shown in Fig. 5.
3. Remove 4 screws marked by arrows with a box type screwdriver as
shown in Fig. 5.
Since the cabinet will drop when screws have been removed, be sure
•
to support the cabinet with hands.
4. After 4 screws have been removed, put the cabinet slowly on cloth
(At this time, be carefully so as not to damage the front surface of the
cabinet) shown in Fig. 6.
The CRT should be assembled according to the opposite sequence
•
of its dismounting steps.
* The CRT change table should preferably be smaller that the CRT sur-
face, and its height be about 35cm.
CRT CHANGE TABLE
CLOTH
CRT
CHANGE
TABLE
Fig. 4
CRT
APPROX.
35cm
BOX
TYPE
SCREW
DRIVER
COATING OF SILICON GREASE FOR ELECTRICAL INSULATION ON THE CRT ANODE CAP SECTION.
Subsequent to replacement of the CRT and HV transformer or repair
•
of the anode cap, etc. by dismounting them, be sure to coat silicon
grease for electrical insulation as shown in Fig. 7.
1. Wipe around the anode button with clean and dry cloth. (Fig. 7)
2. Coat silicon grease on the section around the anode button. At this
time, take care so that any silicon greases dose not sticks to the
anode button. (Fig. 8)
夝 Silicon grease product No. KS - 650N
CRT
Anode button
CABINET
Approx.
20mm (Do not
coat grease on
this section
Fig. 5
CRT
CRT
CHANGE TABLE
Fig. 6
Silicon grease
should be coated
by 5mm or more
from the outside
diameter of anode
cap.
Silicon grease
coating
Fig. 7
10 No. 51898
Anode button
(No sticking of
silicon grease)
Coating position
of silicon grease
Anode cap
Fig. 8
REPLACEMENT OF MEMORY IC
AV-21L91
AV-25L91
AV-29L91
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 Table1.
If the value is different, select the setting item with the MENU
&/^ 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
MENU
POWER
MENU
MENU
DISPLAY
MENU
DISPLAY
MENU
CHANNEL VOLUME
SYSTEM
SOUND MUTING
COLOUR
PICTURE
MODE
TV/VIDEO
PICTURE MODE
CHANNEL SCAN
I/II
RETURN
ECO SENSOR
123
456
7809
-/--
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
3. DEF
5. PRESET
7. PLUG & PLAY (OFF)
1-7 : SELECT DISPLAY : EXIT
******* **** ***** *****
**** **** *** ***
2. VC
4. VSM PRESET
6. AUDIO
Fig. 1
SYSTEM CONSTANT-
SYSTEM CONSTANT SET 1
SYSTEM
COMB
TILT
TEXT
SUPER BASS
LANGUAGE
SELECT BY
OPERATE BY +
-
SYSTEM CONSTANT-
SYSTEM CONSTANT SET 2
MSP
BILINGUAL
B / B SOUND
TUNER
COLOUR AUTO
+
SELECT BY
OPERATE BY +
-
SYSTEM CONSTANT-
SYSTEM CONSTANT SET 3
LOCK 1 MHz
500 kHz
250 kHz
156.25 kHz
31.25 kHz
SELECT BY
OPERATE BY +
-
MULTI
YES
YES
YES
NO
E / R / C
MENU 89
DISPLAY
YES
NO
NO
MU
NO
MENU 89
DISPLAY
010
010
010
010
010
MENU 89
DISPLAY
I
II
III
MODE
Fig. 2
No. 51898 11
AV-21L91
AV-25L91
AV-29L91
SETTING OF SYSTEM CONSTANT SET
Setting item Setting content
SYSTEM
COMB
TILT
TEXT
SUPER BASS
LANGUAGE
MSP
BILINGUAL
B/B SOUND
TUNER
COLOUR AUTO
LOCK 1MHz
500KHz
250KHz
156.25KHz
31.25KHz
EASTERN UKRANIAN RUSSIAN
NO PAN EURO ARABIC
MULTI TRIPLE
VIET PAL
YES NO
YES NO
YES PSEUDO NO
E/T E
YES NO
YES NO
YES NO
MU MA
YES NO
000 024
000 024
000 024
000 024
000 024
MULTI
NO
NO
NO
NO
E/T
YES
NO
NO
MU
NO
020
020
020
015
015
Setting value
AV-29L91-BKAV-25L91-BKAV-21L91-BK
YES
YES
Table 1
12 No. 51898
USER SETTING VALUES
Setting item Setting value
SUB POWER ON
CHANNEL POSITION 1 POSITION
CHANNEL PRESET REFER TO OPERATING INSTRUCTIONS
VOLUME 15 ± 2
TV/VIDEO TV
VNR OFF
COMPRESS (16:9) OFF
AUTO SHUTOFF OFF
CHILD LOCK OFF
BLUE BACK ON
VIDEO-2 SET VIDEO
LANGUAGE THAI
AI VOLUME ON
ON SCREEN DISPLAY POSITION INDICATION
COLOUR SYSTEM PAL
SOUND SYSTEM B/G
STEREO MODE STEREO
PICTURE MODE-VSM BRIGHT
OFF TIMER 00
ECO SENSOR OFF
BASS CENTRE
TREBLE CENTRE
BALANCE CENTRE
PICTURE TILT 00 [AV-29L91-BK]
AV-21L91
AV-25L91
AV-29L91
Table 2
No. 51898 13
AV-21L91
AV-25L91
AV-29L91
SERVICE MENU SETTING ITEMS
Service menu Setting item
1. IF 1. VCO
2. DELAY POINT
2. VC 1. CUTOFF(R/G)
2. DRIVE(R/G/B)
3. BRIGHT
4. CONT
5. COLOUR
6. TINT
7. SHARP
8. YDELAY
3. DEF 1. VER. SLOPE
2. VER. HEIGHT
3. VER. POSITION
4. VER. SCURVE
5. HOR. POSITION
6. HOR. WIDTH
7. EW-PIN
8. EW-TRAPEZ
9. UP CORNER
10. DW CORNER
11. HOR. PARALL
12. HOR. BOW
13. V. ZOOM
Do not adjust
Service menu Setting item
5. PRESET 1. CB
Do not adjust
6. AUDIO 1. ERROR LIMIT
Do not adjust
6 / 7.
PLUG & PLAY(OFF)
Do not adjust
2. ACL
3. MUS
4. MAT
5. FCO
6. BPS
7. IFLH
8. VID
9. STM
10. AFCW
11. VSW
12. FFI
13. AGC
14. CL
15. AKB
16. HBL
17. BKS
18. READ STATUS
19. VNR
2. A2 ID THR
3. SOUND SYSTEM
4. VSM PRESET 1. TINT
(BRIGHT/STD/SOFT) 2. COLOUR
Do not adjust
3. BRIGHT
4. CONT
5. SHARP
Table 3
14 No. 51898
REPLACEMENT OF CHIP COMPONENT
CAUTIONS
a
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
a
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
a
1. How to remove Chip parts
Resistors, capacitors, etc.
(1) As shown in the figure, push the part with tweezers and alter-
nately melt the solder at each end.
AV-21L91
AV-25L91
AV-29L91
2. How to install Chip parts
Resistors, capacitors, etc.
(1) Apply solder to the pattern as indicated in the figure.
(2) Shift with tweezers and remove the chip part.
Transistors, diodes, variable resistors, etc.
(1) Apply extra solder to each lead.
SOLDER
(2) As shown in the figure, push the part with tweezers and alter-
nately melt the solder at each lead. Shift and remove the chip
part.
SOLDER
(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 A as indicated in the figure.
A
B
C
(4) Then solder leads B and C.
A
Note : After removing the part, remove remaining solder from the
pattern.
No. 51898 15
B
C
AV-21L91
AV-25L91
SERVICE ADJUSTMENTS
ADJUSTMENT PREPARATION:
1. You can make the necessary adjustments for this unit with either the remote control unit or with the adjustment equipment and parts
as given below.
2. Adjustment with the remote control unit is made on the basis of the initial setting values, however, the new setting values which set the
screen to its optimum condition may differ from the initial settings.
3. Make sure that AC power is turned on correctly.
4. Turn on the power for the set and test equipment before use, and start the adjustment procedures after waiting at least 30 minutes.
5. Unless otherwise specified, prepare the most suitable reception or input signal for adjustment.
6. Never touch any adjustment parts, which are not specified in the list for this adjustment-variable resistors, transformers, capacitors, etc.
7. Presetting before adjustment.
Unless otherwise specified in the adjustment instructions, preset the following functions with the remote control unit.
User mode setting position
•
Setting item Setting value
PICTURE MODE(VSM) BRIGHT
VNR OFF
BASS,TREBLE,BALANCE CENTRE
TINT,COLOUR,BRIGHT,CONT,SHARP CENTRE
MEASURING INSTRUMENT
1. DC voltmeter (or Digital voltmeter)
2. Oscilloscope
3. Signal generator (Pattern generator) [PAL/SECAM/NTSC]
4. Remote control unit
ADJUSTMENT ITEMS
B1 POWER SUPPLY
•
FOCUS adjustment
•
IF circuit adjustment
•
VCO (CW) adjustment
DELAY POINT adjustment
VC (VIDEO/CHROMA) circuit adjustment
•
WHITE BALANCE (Low light) adjustment
WHITE BALANCE (High light) adjustment
SUB BRIGHT adjustment
SUB CONT adjustment
SUB COLOUR adjustment
SUB TINT adjustment
DEFLECTION circuit adjustment
•
VER. SLOPE adjustment
VER. POSITION adjustment
V. ZOOM adjustment
HOR. POSITION adjustment
HOR. WIDTH adjustment
EW-PIN adjustment
EW-TRAPEZ adjustment
VER. SCURVE adjustment
UP CORNER and DW CORNER adjustment
HOR. PARALL adjustment
HOR. BOW adjustment
VSM PRESET adjustment
•
PRESET adjustment
•
AUDIO adjustment
•
PURITY and CONVERGENCE adjustments
•
PURITY adjustment
STATIC CONVERGENCE adjustment
DYNAMIC CONVERGENCE adjustment
16 No. 51898
ADJUSTMENT LOCATIONS [AV-21L91-BK, AV-25L91-BK]
AV-21L91
AV-25L91
MAIN PWB
POWER SW
S901
PW
DEG
IC702
S783 S781
S784 S782 S780
T
61
IC701
J773
J772 J771
J770
CN001
GND B1
5
S
41
U
S780 : MENU
S781 : CH–
S782 : CH+
S783 : VOL–
S784 : VOL+
HV
1
FRONT
16
HVT
AV IN/OUT
CRT SOCKET PWB
(Within MAIN PWB ASS’Y)
(SOLDER SIDE)
J804J801 J802 J803
TU001
T
61
TP-47G
UPPER : FOCUS (F1)
LOWER : SCREEN
TOP
U
41
E1
TP-E
CRT EARTH
(BRAIDED ASS'Y)
No. 51898 17
AV-29L91
ADJUSTMENT LOCATIONS [AV-29L91-BK]
FRONT CONTROL PWB(1/2) FRONT CONTROL PWB(2/2)
POWER
SW.
S901
PW
FRONT
CN002
R
W
CN001
S804
S805
S806 S802
CN002
CN00A
S803S801
J304 J303 J302
MAIN PWB
Z
W
DEG
CN001
T
18
IC702
IC701
J801
CN003
FRONT
FRONT
S801 : CH UP +
S802 : CH DOWN –
S803 : MENU
S804 : TV/VIDEO
S805 : VOL UP+
S806 : VOL DOWN –
J804J801 J802 J803
AV IN/OUT
CRT SOCKET PWB
TP-47G
TU001
GND B1
5
S
61
U
TP-47B
HV
16
1
HVT
UPPER : FOCUS (F1)
MIDDLE : FOCUS (F2)
LOWER : SCREEN
(SOLDER SIDE)
TOP
TP-E
E1
81
T
18 No. 51898
16
CRT EARTH
(BRAIDED ASS'Y)
U
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.VC ....................................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.
•
5.PRESET ........................... For setting the values of the preset.
•
6. AUDIO ............................. For entering/adjusting the setting values (adjustment values) of the multiplicity sound circuit.
•
7.PLUG & PLAY (OFF). ...... This is not used for service.
•
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 on the next page.)
(2) Selection of SUB MENU SCREEN
Press one of the keys 1 to 7 on the remote control unit, and select the SUB MENU SCREEN from the SERVICE MENU. (See Fig.1 on the
next page.)
(VSM:video status memory)
AV-21L91
AV-25L91
AV-29L91
SERVICE MENU → SUB MENU 1. IF
2. VC
3. DEF
4. VSM PRESET
5. PRESET
6. AUDIO
7. PLUG & PLAY (OFF)
(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.
(c) DISPLAY Key ............ When this pressed twice, you will return to the SERVICE MENU.
Under normal conditions, no adjustment is required.
[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. VC, 3. DEF, 4. VSM PRESET, 5. PRESET and 6. AUDIO
(a) 2 ~5 Keys.................. Select one from 2. VC, 3. DEF, 4. VSM PRESET, 5. PRESET and 6. AUDIO.
(b) MENU &/^ key ....... Select setting items.
(c) MENU –/+Key ........... Adjust the setting values of the setting items.
(d) DISPLAY Key ........... When this is pressed, you will return to the SERVICE MENU.
•
Use the number keys on the remote control unit for setting of WHITE BALANCE.
•
For the setting, refer to each item concerned.
3) 7. PLUG & PLAY (OFF)
This is not used for service.
(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. 51898 19
AV-21L91
AV-25L91
AV-29L91
SERVICE MENU
SERVICE MENU
1. IF
3. DEF
5. PRESET
7. PLUG & PLAY (OFF)
1-7 : SELECT DISPLAY : EXIT
******* **** ***** *****
**** **** *** ***
2. VC
4. VSM PRESET
6. AUDIO
SUB MENU 1. IF
IF
1. VCO
2. DELAY POINT
1-2 : SELECT DISPLAY : EXIT
SUB MENU 2. VC
V/C
1. CUTOFF
50 Hz
MENU 89: SELECT
MENU
-
/+ : OPERATE
(R)
(G)
DISPLAY : EXIT
PAL
**
**
Setting item
1. CUTOFF (R/G)
2. DRIVE (R/G/B)
3. BRIGHT
4. CONT
5. COLOUR
6. TINT
7. SHARP
8. YDELAY
VCO (CW)
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
DELAY POINT VHF
AGC TAKE-OVER
-
/+ : OPERATE
MHz
*****
DISPLAY : EXIT
**
DISPLAY : EXIT
SUB MENU 6.AUDIO
AUDIO
1. ERROR LIMIT
C AD BITS
NICAM ERROR
89: SELECT
-
/+ : OPERATE
Setting item
1. ERROR LIMIT
2. A2 ID THR
3. SOUND SYSTEM
MHz
*****
****
*********
****
DISPLAY : EXIT
SUB MENU 3. DEF
DEF 4 : 3
1. VER. SLOPE
50Hz
MENU 89: SELECT
MENU
-
/+ : OPERATE
PAL
**
DISPLAY : EXIT
SUB MENU 4. VSM PRESET
BRIGHT
TINT
COLOUR
BRIGHT
CONT
SHARP
MENU 89: SELECT
MENU
-
/+ : OPERATE
**
**
**
**
**
DISPLAY : EXIT
SUB MENU 5. PRESET
PRESET 50Hz B/G
1. CB
MENU 89: SELECT
MENU
-
/+ : OPERATE
PAL
*
DISPLAY : EXIT
4 : 3 / 16 : 9, 50Hz / 60Hz
1. VER. SLOPE
2. VER. HEIGHT
3. VER. POSITION
4. VER. SCURVE
5. HOR. POSITION
6. HOR. WIDTH
BRIGHT / STD / SOFT
Setting item
1. TINT
2. COLOUR
3. BRIGHT
4. CONT
5. SHARP
1. CB
2. ACL
3. MUS
4. MAT
5. FCO
6. BPS
7. IFLH
8. VID
9. STM
Setting item
7. EW-PIN
8. EW-TRAPEZ
9. UP CORNER
10. DW CORNER
11. HOR. PARALL
12. HOR. BOW
13. V. ZOOM
Setting item
10. AFCW
11. VSW
12. FFI
13. AGC
14. CL
15. AKB
16. HBL
17. BKS
18. READ STATUS
19. VNR
Fig. 1
20 No. 51898
ADJUSTMENTS
B1 POWER SUPPLY
Item
Measuring
instrument
AV-21L91
AV-25L91
AV-29L91
Test point Adjustment part Description
Check of
B1 POWER
SUPPLY
Signal
Generator
DC Voltmeter
B1 (pin 1)
GND (pin 5)
[CN00S
connector]
FOCUS ADJUSTMENT
[AV-21L91-BK, AV-25L91-BK]
Item
Adjustment
of FOCUS
Measuring
instrument
Signal
generator
Test point Adjustment part Description
FOCUS VR
[In HVT]
1. Receive a black and white signal.
2. Connect a DC voltmeter between B1 and GND
(between pins 1 and 5 of the connector CN00S).
3. Make sure that the voltage is as shown below.
B1 voltage
AV-21L91-BK
AV-25L91-BK
AV-29L91-BK DC 134.5 ± 2V
Notes:
• Set PICTURE MODE (VSM) to “BRIGHT”.
• The final adjustment of CONVERGENCE must be done after the
FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.)
When makes difference by FOCUS adjustment, should be reconfirming
PURITY adjustment.
DC 135 ± 2V
[AV-29L91-BK]
Item
Adjustment
of FOCUS
Signal
generator
Measuring
instrument
1. Receive a cross-hatch signal.
2. While looking at the screen centre, adjust the FOCUS VR so that
the vertical and horizontal lines will be clear and in fine detail.
3. Make sure that the picture is in focus even when the screen gets
darkened.
Test point Adjustment part Description
FOCUS VR1,2
[In HVT]
Notes:
• Proceed to the following this adjustment after having completed the
adjustments of B1 POWER SUPPLY, SUB BRIGHT and SUB CONT.
• Set PICTURE MODE (VSM) to “BRIGHT”.
• The final adjustment of CONVERGENCE must be done after the
FOCUS adjustment. (CONVERGENCE is changed by FOCUS adjustment.)
When makes difference by FOCUS adjustment, should be reconfirming
PURITY adjustment.
1. Receive a cross-hatch signal.
2. While looking at the screen centre, adjust the FOCUS VR2 (F2) so
that the horizontal lines will be clear and in fine detail.
3. Adjust the FOCUS VR1 (F1) so that the vertical lines will be clear
and in fine detail.
4. Make sure that the picture is in focus even when the screen gets
darkened.
No. 51898 21
AV-21L91
AV-25L91
AV-29L91
IF CIRCUIT ADJUSTMENT
Item
Adjustment
of VCO (CW)
Measuring
instrument
Remote
control unit
VCO (CW)
TOO HIGH
ABOVE REFERENCE
BELOW REFERENCE
TOO LOW
DISPLAY : EXIT
Test point Adjustment part Description
VCO (CW)
Note:
• Under normal conditions, no adjustment is required.
1. Select 1. IF from the SERVICE MENU.
2. Select 1. VCO by pressing the 1 key on the remote control unit.
3. Receive a broadcast signal.
4. Check the characters colour of the BELOW REFERENCE displayed
. MHz
fv
to yellow.
5. Press the DISPLAY key three times to return to normal screen.
YELLOW
Adjustment
of DELAY
POINT
Setting
(Adjustment time)
DELAY POINT
(AGC TAKE-OVER)
Remote
control unit
DELAY POINT
(AGC TAKE-OVER)
Initial setting value
NTSC 3.58 22
OTHERS 20
1. Receive a black and white broadcast signal (colour off).
2. Select 1. IF from the SERVICE MENU.
3. Select 2. DELAY POINT by pressing the 2 key on the remote con-
trol unit.
4. Adjust the MENU –/+ key in order to eliminate any noise or beat
from the image. Any increase above the initial value produces noise
and any decrease below it produces beat.
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.
22 No. 51898
VC (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. VC] : Do not adjust.
Setting (Adjustment)
item
Variable range
PAL SECAM NTSC3.58 NTSC4.43 COMPONENT
1 CUTOFF (R/G) -7 – +8 0
2 DRIVE (R/G/B) -30 – +31 0
BRIGHT
3
(COM./TV/V-1/V-2/V-3)
-30 – +31
0/-18/0/0/0
-1/-16/0/0/0 AV-29L91-BK
4 CONT -30 – +31
-20 —
0 — AV-29L91-BK
Initial setting value
Remark
AV-21L91-BK
AV-25L91-BK
AV-21L91-BK
AV-25L91-BK
AV-21L91
AV-25L91
AV-29L91
5 COLOUR -30 – +31
-5 -3 -12 -2 +10 AV-21L91-BK
-5 -3 -12 -6 +10 AV-25L91-BK
-5 -3 -12 +1 +10 AV-29L91-BK
6 TINT (TV/VIDEO) -30 – +31
——-15/+4 +1/+1 —
——-15/+6 +1/+1 — AV-29L91-BK
7 SHARP (TV/VIDEO) -30 – +31
-16/-2 —/0
-24/-10 —/0 AV-29L91-BK
8 YDELAY (TV/VIDEO) -8 – +7 0/+1 +5/+1 0/+1 +5/0 —
Item
Adjustment
of WHITE
Measuring
instrument
Signal
generator
Test point Adjustment part Description
1. CUTOFF (R)
CUTOFF (G)
Note:
• Set PICTURE MODE (VSM) to “BRIGHT”.
BALANCE
(Low light)
Remote
control unit
SCREEN VR
[In HVT]
1. Receive a PAL black and white signal (colour off).
2. Select 2. VC from the SERVICE MENU.
3. Select 1. CUTOFF (R) and (G) with MENU &/^ key, and set each
V/C
-
/+ : OPERATE
(R)
(G)
1. CUTOFF
50 Hz
MENU 89: SELECT
MENU
PAL
**
**
DISPLAY : EXIT
value to initial setting value with the 4 and 7 keys, or 5 and 8 keys on
the remote control unit.
4. Press the 1 key on the remote control unit to produce a single hori-
zontal 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 the keys 4 and 7 or 5 and 8 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
1. CUT OFF
R –7 — +8 0
G –7 — +8 0
H.LINE OFF
H.LINE ON
R. CUTOFF (
R. CUTOFF (
REMOTE CONTROL UNIT
12 3
4
8
)
789
)
9
56
G. CUTOFF (8)
G.CUTOFF (
9
)
AV-21L91-BK
AV-25L91-BK
AV-21L91-BK
AV-25L91-BK
No. 51898 23
AV-21L91
AV-25L91
AV-29L91
Item
Adjustment
of WHITE
BALANCE
(High light)
R. DRIVE (
R. DRIVE (
Measuring
instrument
Signal
generator
Test point Adjustment part Description
2. DRIVE (R)
DRIVE (G)
DRIVE (B)
Remote
control
unit
V/C
-
/+ : OPERATE
(R)
(G)
(B)
1. DRIVE
50 Hz
MENU 89: SELECT
MENU
PAL
**
**
**
DISPLAY : EXIT
REMOTE CONTROL UNIT
12 3
4
8
) B. DRIVE (8)
789
)
9
56
G. DRIVE (8)
B. DRIVE (
G.DRIVE (
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of LOW LIGHT WHITE BALANCE.
• Set PICTURE MODE (VSM) to “BRIGHT”.
1. Receive a PAL black and white signal (colour off).
2. Select 2. VC from the SERVICE MENU.
3. Select 2. DRIVE (R), (G) and (B) with MENU &/^ key,and set each
value to initial setting value with the 4 to 9 keys on the remote control unit.
4. Use the keys 4 to 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 –30 — +31 0
2. DRIVE G –30 — +31 0
B –30 — +31 0
)
9
)
9
Adjustment
of
SUB BRIGHT
Adjustment
of
SUB CONT
Remote
control unit
Remote
control unit
3. BRIGHT
4. CONT
Notes:
• Proceed to the following this adjustment after having completed the
adjustments of LOW LIGHT WHITE BALANCE and HIGH LIGHT
WHITE BALANCE.
• Set PICTURE MODE (VSM) to “BRIGHT”.
1. Receive a broadcast.
2. Select 2. VC from the SERVICE MENU.
3. Select 3. BRIGHT with the MENU &/^ key.
4. Set the initial setting value with the MENU –/+ key.
5. If the brightness is not best with the initial setting value, make fine
adjustment until you get the best brightness.
6. Press the DISPLAY key twice to return to the normal screen.
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of SUB BRIGHT.
• Set PICTURE MODE (VSM) to “BRIGHT”.
1. Receive a broadcast.
2. Select 2. VC from the SERVICE MENU.
3. Select 4. CONT with the MENU &/^ key.
4. Set the initial setting value with the MENU –/+ key.
5. If the contrast is not best with the initial setting value, make fine
adjustment until you get the best contrast.
6. Press the DISPLAY key twice to return to the normal screen.
24 No. 51898
AV-21L91
AV-25L91
AV-29L91
Item
Adjustment
of
SUB
COLOUR-I
Measuring
instrument
Remote
control unit
Test point Adjustment part Description
5. COLOUR
[Method of adjustment without measuring instrument]
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of SUB CONT.
• Set PICTURE MODE (VSM) to “BRIGHT”.
– PAL COLOUR –
1. Receive a PAL broadcast.
2. Select 2. VC from the SERVICE MENU.
3. Select 5. COLOUR with the MENU &/^ key.
4. Set the initial setting value for PAL COLOUR with the MENU –/+ key.
5. If the colour is not best with the initial setting value, make fine ad-
justment until you get the best colour.
6. Press the DISPLAY key twice to return to the normal screen.
– SECAM COLOUR –
7. Receive a SECAM broadcast.
8. Press the COLOUR SYSTEM button on the remote control unit to
select the SECAM colour system.
9. Make fine adjustment of SECAM COLOUR in the same way as for
“PAL COLOUR”.
– NTSC 3.58 COLOUR –
10. Receive a NTSC 3.58MHz broadcast.
11. Press the COLOUR SYSTEM button on the remote control unit to
select the NTSC 3.58 colour system.
12. 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.
Adjustment
of
SUB
COLOUR-II
AV-21L91-BK +14V +5V +5V
AV-25L91-BK +14V –3V +3V
AV-29L91-BK +8V +2V +2V
Signal
generator
Oscilloscope
Remote
control unit
Cy
Y
W
TP-47G
5. COLOUR [Method of adjustment using measuring instrument]
TP-E (H)
[CRT
SOCKET
PWB]
B
Mg
R
(A)
(–)
0V
G
(+)
A (VW-G)
PAL SECAM NTSC 3.58
Table 1
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of SUB CONT.
• Set PICTURE MODE (VSM) to “BRIGHT”.
– PAL COLOUR –
1. Receive a PAL colour bar signal (full field colour bar 75% white).
2. Select 2. VC from the SERVICE MENU.
3. Select 5. COLOUR with the MENU &/^ key.
4. Set the initial setting value of PAL COLOUR with the MENU –/+ key.
5. Connect the oscilloscope between TP-47G and TP-E.
6.
Adjust PAL COLOUR to set the value (A) in the figure to the voltage
shown in the Table 1.
– SECAM COLOUR –
7. Receive a SECAM colour bar signal (full field colour bar 75% white).
8. Press the COLOUR SYSTEM button on the remote control unit to
select the SECAM colour system.
9. Set the initial setting value of SECAM COLOUR with the MENU –/+ key.
10. Adjust SECAM COLOUR to set the value (A) in the figure to
the
voltage shown in the Table 1.
– NTSC 3.58 COLOUR –
11. Receive a NTSC 3.58 colour bar signal (full field colour bar 75% white).
12. Press the COLOUR SYSTEM button on the remote control unit to
select the NTSC 3.58 colour system.
13. Set the initial setting value of NTSC 3.58 COLOUR with the MENU
–/+ key.
14. Adjust NTSC 3.58 COLOUR to set the value (A) in the figure to
the voltage shown in the Table 1.
– NTSC 4.43 COLOUR –
When adjustment is done for NTSC 3.58 COLOUR, appropriate
values are automatically set for NTSC 4.43 COLOUR.
No. 51898 25
AV-21L91
AV-25L91
AV-29L91
Item
Adjustment
of
SUB TINT-I
Measuring
instrument
Remote
control unit
Test point Adjustment part Description
6. TINT [Method of adjustment without measuring instrument]
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of SUB CONT.
• Set PICTURE MODE (VSM) to “BRIGHT”.
– NTSC 3.58 TINT –
1. Receive a NTSC 3.58 colour bar signal (full field colour bar 75%
white).
2. Press the COLOUR SYSTEM button on the remote control unit to
select the NTSC 3.58 colour system.
3. Select 2. VC from the SERVICE MENU.
4. Select 6. TINT with the MENU &/^ key.
5. Set the initial setting value of NTSC 3.58 with the MENU –/+ key.
6. If you cannot get the best tint with the initial setting value, make fine
adjustment until you get the best tint.
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.
Adjustment
of
SUB TINT-II
Signal
generator
TP-47G
TP-E (H)
[CRT
Oscilloscope
SOCKET
PWB]
Remote
control unit
B
Mg
R
(B)
Cy
W
G
Y
B (VW-Cy)
AV-21L91-BK +6V
AV-25L91-BK +3V
AV-29L91-BK 0V
Table 2
6. TINT [Method of adjustment using measuring instrument]
Notes:
• Proceed to the following this adjustment after having completed the
adjustment of SUB CONT.
• Set PICTURE MODE (VSM) to “BRIGHT”.
– NTSC 3.58 TINT –
1. Receive a NTSC 3.58 colour bar signal (full field colour bar 75%
white).
2. Press the COLOUR SYSTEM button on the remote control unit to
select the NTSC 3.58 colour system.
3. Select 2. VC from the SERVICE MENU.
4. Select 6. TINT with the MENU &/^ key.
5. Set the initial setting value of NTSC 3.58 with the MENU –/+ key.
(–)
0V
(+)
6. Connect the oscilloscope between TP-47G and TP-E.
7.
Adjust NTSC 3.58 TINT to set the value (B) in the figure to the voltage
shown in the Table 2.
8. 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.
26 No. 51898
DEFLECTION CIRCUIT ADJUSTMENT [AV-21L91-BK]
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.
Note:
Proceed to the following this adjustment after having completed the adjustments of SUB BRIGHT and SUB CONT.
[SUB MENU 3. DEF] : Do not adjust.
Setting
(Adjustment)
item
Variable range
50Hz 60Hz
4:3
1. VER. SLOPE –31 — +31 +3 –1+3–1 —
2. VER. HEIGHT –31 — +31 +31 +9 –32 –31 —
3. VER. POSITION –31 — +31 +5 0 +5 0 —
4. VER. SCURVE –31 — +31 –21 –2 –21 –2 —
5. HOR. POSITION –31 — +31 +3 +10 +3 +10 +7
6. HOR. WIDTH –31 — +31 +11 –1 +11 –1 —
7. EW-PIN –31 — +31 –11 0 –13 –12 —
8. EW-TRAPEZ –31 — +31 +20 0 +20 0 —
9. UP CORNER –31 — +31 –25 0 0 0 —
10. DW CORNER –31 — +31 –25 0 0 0 —
11. HOR. PARALL –31 — +31 –11 0 –11 0 —
12. HOR. BOW –31 — +31 0 0 0 0 —
13. V.ZOOM –31 — +31 –1 +1 +14 +14 —
Initial setting value
COMPRESS(16:9)
50Hz 60Hz
COMPONENT
DVD(50Hz/60Hz)
AV-21L91
[fv : 50Hz mode]
Item
Adjustment
of
VER. SLOPE
Adjustment
of
VER.POSITION
Measuring
instrument
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Test point Adjustment part Description
1. VER. SLOPE 1. Receive a PAL circle pattern signal of vertical frequency 50Hz.
2. Select 3. DEF from the SERVICE MENU.
3. Select 1. VER. SLOPE with the MENU &/^ key.
4. Set the initial setting value of 1. VER. SLOPE with the MENU –/+
key.
5. Adjust 1. VER. SLOPE to make “A = B” with the MENU –/+ key.
A
Blanking
line
B
3. VER. POSITION 6. Select 3. VER. POSITION with the MENU &/^ key.
7. Set the initial setting value of 3. VER. POSITION with the MENU –/+
key.
8. Adjust 3. VER. POSITION to make “A = B” with the MENU –/+ key.
A
(to be continued)
B
No. 51898 27
AV-21L91
Item
Adjustment
of
V. ZOOM
Screen
size
91%
Adjustment
of
HOR. POSITION
Measuring
instrument
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
Test point Adjustment part Description
2. VER. HEIGHT
13. V. ZOOM
9. Receive a PAL cross-hatch signal.
10. Select 2. VER. HEIGHT with the MENU &/^ key.
11. Set the initial setting value of 2. VER. HEIGHT with the MENU –/+
key.
12. Select 13. V. ZOOM with the MENU &/^ key.
13. Set the initial setting value of 13. V. ZOOM with the MENU –/+ key.
Screen size
14. Adjust 13. V. ZOOM and make the vertical screen size 91% of the
picture size with the MENU –/+ key.
Picture
size
100%
Picture size 100%
5. HOR. POSITION 15. Receive a PAL circle pattern signal.
16. Select 5. HOR. POSITION with the MENU &/^ key.
17.
Set the initial setting value of 5. HOR. POSITION with the MENU –/+
key.
18 Adjust 5. HOR POSITION to make “C=D” with the MENU –/+ key.
Adjustment
of
VER. SCURVE
CD
Signal
4. VER. SCURVE 19. Receive a PAL cross-hatch signal.
generator
Remote
control unit
TOP
CENTRE
20. Select 4. VER. SCURVE with the MENU &/^ key.
21. Set the initial setting value of 4. VER. SCURVE with the MENU –/+
key.
22. Adjust 4. VER. SCURVE so that the spaces of each line on TOP,
CENTRE and BOTTOM become uniform.
(to be continued)
BOTTOM
28 No. 51898
[fv : 60Hz mode]
Item
Measuring
instrument
AV-21L91
Test point Adjustment part Description
Adjustment
of
VER. SLOPE
Adjustment
of
VER.POSITION
Signal
generator
Remote
control unit
Signal
generator
Remote
control unit
1. VER. SLOPE 1. Receive a NTSC circle pattern signal of vertical frequency 60Hz.
2. Select 3. DEF from the SERVICE MENU.
3. Select 1. VER. SLOPE with the MENU &/^ key.
4. Set the initial setting value of 1. VER. SLOPE with the MENU –/+
key.
5. Adjust 1. VER. SLOPE to make “A = B” with the MENU –/+ key.
A
Blanking
line
B
3. VER. POSITION 6. Select 3. VER. POSITION with the MENU &/^ key.
7. Set the initial setting value of 3. VER. POSITION with the MENU –/+
key.
8. Adjust 3. VER. POSITION to make “A = B” with the MENU –/+ key.
Adjustment
of
V. ZOOM
Screen
size
91%
Signal
generator
Remote
control unit
Screen size
A
B
2. VER. HEIGHT
13. V. ZOOM
Picture
size
100%
9. Receive a NTSC cross-hatch signal.
10. Select 2. VER. HEIGHT with the MENU &/^ key.
11. Set the initial setting value of 2. VER. HEIGHT with the MENU –/+
key.
12. Select 13. V. ZOOM with the MENU &/^ key.
13. Set the initial setting value of 13. V. ZOOM with the MENU –/+ key.
14. Adjust 13. V. ZOOM and make the vertical screen size 91% of the
picture size with the MENU –/+ key.
Picture size 100%
(to be continued)
No. 51898 29
AV-21L91
Item
Adjustment
of
HOR. POSITION
Adjustment
of
VER. SCURVE
Measuring
instrument
Signal
Test point Adjustment part Description
5. HOR. POSITION 15. Receive a NTSC circle pattern signal.
generator
Remote
control unit
CD
Signal
4. VER. SCURVE 19. Receive a NTSC cross-hatch signal.
generator
Remote
control unit
16. Select 5. HOR. POSITION with the MENU &/^ key.
17. Set the initial setting value of 5. HOR. POSITION with the MENU –/+
key.
18. Adjust 5. HOR. POSITION to make “C=D” with the MENU –/+ key.
20. Select 4. VER. SCURVE with the MENU &/^ key.
21. Set the initial setting value of 4. VER. SCURVE with the MENU –/+
key.
22. Adjust 4. VER. SCURVE so that the spaces of each line on TOP,
CENTRE and BOTTOM become uniform.
TOP
CENTRE
BOTTOM
30 No. 51898
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