Table of Contents
Advertisement
TX-25P80T
5 ADJUSTMENT PROCEDURE
5.1.
B VOLTAGE
1. Operate the TV set.
2. Set controls : (MARKET MODE CHK 2)
Bright ............. Minimum
Contrast ......... Minimum
Volume ............. Minimum
5.2.
RF AGC
1. Receive a colour bar pattern.
2. Set the input level to 66 (+1.2) db.
(75Ω opened)
3. Connect an oscilloscope to AGC : TPA 20 with DC mode.
5.3.
HIGH VOLTAGE
1. Operate the TV set.
2. Receive the crosshatch pattern.
3. Set to 0 Beam
(Screen Control : min. CONTRAST : min)
5.4.
SUB TINT
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
5.5.
SUB CONTRAST
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.
4. Set controls:
Picture menu ........ Dynamic Normal
AI .................... ......... off
Item/Preparation
Item/Preparation
Item/Preparation
Item/Preparation
Item/Preparation
Adjustment Procedure
1. Confirm that the indicated test points for the
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
Adjustment Procedure
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.
3. Increase the input level by 3 db and confirm that the voltage
changes.
Adjustment Procedure
1. Connect a DC voltage meter to D850 cathode and confirm the
voltage is 141.0±2.0V.
2. Connect a high voltage meter (Electrostatic Type) to an anode of
the picture tube.
3. Confirm that the high voltage is within the range of 31.0+0.7V,
-1.5V.
Adjustment Procedure
1. Adjust Sub NTSC Tint so that the peak of level of waveform is
similar to Fig. 3
2. Receive the Rainbow pattern (3.58 MHz NTSC) on both of Main
and Sub pictures.
3. Adjust Sub NTSC Tint 2 so that the peak of level of 1.3±0.5V
Adjustment Procedure
1. Adjust Bright Colour:
a=2.4±0.2Vp-p
2. Adjust Sub Contrast Colour:
b=2.4±0.1Vp-p
8
Advertisement
Table of Contents
