Service Adjustments (Electronic Controls)

Sub-Contrast Adjustment

Serviceman DAC Adjustment (B02, B03)

This adjustment is factory set. Do not adjust unless repairs are made to associated circuit, the CRT Board or when the CRT is replaced.

Preparation:

1.Apply a Black-White pattern.

2.Set the picture settings to normal and color to minimum.

3.RGB GAMMA (S03) DAC from 1 to 0

4.Connect the oscilloscope to TP47R.

5.Connect a jumper from TPD2 to cold ground ( ).

Procedure:

1.In the Serviceman Mode, select DAC B2 for Sub- Brightness to obtain 2.6±0.1V between 7.5IRE and GND level at TP47R (See Fig. 25)

2.In the Serviceman Mode, select DAC B03 for Sub- Contrast to obtain 1.5±0.1V between 7.5IRE and 100IRE level at TP47G

3.Remove short jumper and set RGB GAMMA (S03) DAC to 1.

4.Set the picture settings to normal.

.

100IRE

1.5±0.1V

7.5IRE

2.6 v± 0.1V

GND

Figure 25. waveform

Sub-Brightness (B02)

Adjustment of this control is important for setting proper operation of customer brightness and picture controls. Do not adjust the SCREEN VR after the Sub- Brightness is set.

Preparation:

1.Normalize picture settings.

2.Switch COLOR TEMPERATURE to NORMAL.

Procedure:

1.Apply a black white cross pattern.

2.In the Serviceman Mode for making electronic adjustments, select the DAC adjustment (B02) and adjust data so that 7.5IRE part is the same light output as the 3IRE part (See Fig. 26).

3 IRE

 

7.5 IRE

 

Figure 26.

Pattern

Tint/Color Adjustment

Serviceman DAC Adjustment (B01) (B00) Preparation:

1.Apply a rainbow color bar signal.

2.Preset the following controls:

Brightness . . . . . . . Min.

Color . . . . . . . . . . . . Center.

Tint . . . . . . . . . . . . . Center.

Picture . . . . . . . . . . . Max.

Sharpness . . . . . . . . Min.

3.Set RGB GAMMA (S03) DAC to 0

4.Connect the oscilloscope to TP47B (A-Board).

5.Connect a jumper from TPD2 to GND ().

Procedure:

1.In the Serviceman Mode for making electronic adjustments, select (B01) DAC Sub-Tint Adjustment. Adjust until the waveform measured is as the one shown in Fig. 27.

TP47B (A-Board)

C

A

 

 

 

 

B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 2 3

10

A to B = 1 unit

4 5 6 7 8 9

 

A to C = 2 units

 

Figure 27. TP47B waveform

2.Connect the oscilloscope to TP47G or TP35 (L- Board) and cold GND.

3.Select DAC Sub-Color Adjustment (B00) and adjust for peak to peak amplitude to be 0.50Vp-p ±0.05V as shown in Fig .28.

TP47G (A-Board)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

2

3

4

5

6

 

 

 

 

 

 

 

 

 

 

0.50Vp-p±0.05V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

8

9

10

 

 

 

 

Figure 28. TP47G waveform

4.Remove short jumper and set RGB GAMMA (S03) DAC to 1.

PIP Sub-Contrast Adjustment (P03)

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Panasonic CT-32SX31E, CT-36SX31CE Service Adjustments Electronic Controls, Sub-Contrast Adjustment, Sub-Brightness B02

CT-32SX31E, CT-36SX31E, CT-32SX31CE, CT-32SX31UE, CT-36SX31CE specifications

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