Read Panasonic TX-25P80T Service Manual online
5 ADJUSTMENT PROCEDURE
5.1. B VOLTAGE
Item/Preparation
Adjustment Procedure
1.
Operate the TV set.
2.
Set controls : (MARKET MODE CHK 2)
Bright ............. Minimum
Contrast ......... Minimum
Volume ............. Minimum
Bright ............. Minimum
Contrast ......... Minimum
Volume ............. Minimum
1.
Confirm that the indicated test points for the
specified voltage:
TPA 140 : 141±2V
TPA 12 : 12±1.0V
TPA 9 : 9±1V
specified voltage:
TPA 140 : 141±2V
TPA 12 : 12±1.0V
TPA 9 : 9±1V
TPA 5 & TPA 32 : 5±1V
TPA 220 : 220±15V
5.2. RF AGC
Item/Preparation
Adjustment Procedure
1.
Receive a colour bar pattern.
2.
Set the input level to 66 (+1.2) db.
(75
Ω
opened)
3.
Connect an oscilloscope to AGC : TPA 20 with DC mode.
1.
Set RF AGC Control such as to procedure a snowy picture.
2.
Set RF AGC Control at the point just before the voltage at AGC :
TPA 20 begins to drop.
TPA 20 begins to drop.
3.
Increase the input level by 3 db and confirm that the voltage
changes.
changes.
5.3. HIGH VOLTAGE
Item/Preparation
Adjustment Procedure
1.
Operate the TV set.
2.
Receive the crosshatch pattern.
3.
Set to 0 Beam
(Screen Control : min. CONTRAST : min)
(Screen Control : min. CONTRAST : min)
1.
Connect a DC voltage meter to D850 cathode and confirm the
voltage is 141.0±2.0V.
voltage is 141.0±2.0V.
2.
Connect a high voltage meter (Electrostatic Type) to an anode of
the picture tube.
the picture tube.
3.
Confirm that the high voltage is within the range of 31.0+0.7V,
-1.5V.
-1.5V.
5.4. SUB TINT
Item/Preparation
Adjustment Procedure
1.
Receive a 3.58 MHz NTSC rainbow pattern
2.
Connect oscilloscope to A21 pin 6.
3.
Set controls:
BRT............. ...CENTER
COLOUR........CENTER
CONTRAST....MAX
NTSC TINT.....CENTER
AI................ ....OFF
BRT............. ...CENTER
COLOUR........CENTER
CONTRAST....MAX
NTSC TINT.....CENTER
AI................ ....OFF
1.
Adjust Sub NTSC Tint so that the peak of level of waveform is
similar to Fig. 3
similar to Fig. 3
2.
Receive the Rainbow pattern (3.58 MHz NTSC) on both of Main
and Sub pictures.
and Sub pictures.
3.
Adjust Sub NTSC Tint 2 so that the peak of level of 1.3±0.5V
5.5. SUB CONTRAST
Item/Preparation
Adjustment Procedure
1.
Receive a colour bar pattern.
2.
Connect an oscilloscope to TPA40.
3.
Connect a short jumper between D11-1 and D11-2 / TPA53 and
TPA54 FBT pin 3 or TPA34 and TPA32.
TPA54 FBT pin 3 or TPA34 and TPA32.
4.
Set controls:
Picture menu ........ Dynamic Normal
AI .................... ......... off
1.
Adjust Bright Colour:
a=2.4±0.2Vp-p
a=2.4±0.2Vp-p
2.
Adjust Sub Contrast Colour:
b=2.4±0.1Vp-p
b=2.4±0.1Vp-p
8
TX-25P80T
Click on the first or last page to see other TX-25P80T service manuals if exist.