Panasonic CT32SC13G Service Manual - Page 60

Sub-Brightness and Contrast, Service DAC adjustment BRIGH, CONT

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http://tsn.pstc.panasonic.com/viewing/NA/CT-36SL13G/SVC/s1401000000.html 14.1 Sub-Brightness and Contrast Service DAC adjustment (BRIGH, CONT) TOP PREVIOUS NEXT 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. 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 and white pattern. Note: If a black and withe pattern is not available, a color bar pattern with no color can be used following the same procedure; the waveform will be different 2. Set the PICTURE control to the maximum. 3. Set COLOR control to minimum (no color on picture). 4. Set the BRIGHTNESS control to the center. 5. Set the SHARPNESS control to the center. 6. Connect the oscilloscope to TP35. Procedure 1. In the service mode, select DAC for brightness adjustment "BRIGH", and adjust data to obtain 2.3±0.1V between 7.5IRE and GND level at TP35. (See waveform detail). 2. In service mode, select DAC for contrast adjustment "CONT", and adjust data to obtain 3.0±0.1V between 7.5IRE and 100IRE level at TP35. (See waveform detail) http://tsn.pstc.panasonic.com/viewing/NA/CT-36SL13G/SVC/s1401000000.html (1 of 2)05.12.2008 0:02:38

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14.1 Sub-Brightness and Contrast
Service DAC adjustment (BRIGH, CONT)
TOP
PREVIOUS
NEXT
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.
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 and white pattern.
Note:
If a black and withe pattern is not available, a color bar pattern with no color can be used
following the same procedure; the waveform will be different
2.
Set the PICTURE control to the maximum.
3.
Set COLOR control to minimum (no color on picture).
4.
Set the BRIGHTNESS control to the center.
5.
Set the SHARPNESS control to the center.
6.
Connect the oscilloscope to TP35.
Procedure
1.
In the service mode, select DAC for brightness adjustment “BRIGH”, and adjust data to obtain
2.3±0.1V between 7.5IRE and GND level at TP35. (See waveform detail).
2.
In service mode, select DAC for contrast adjustment “CONT”, and adjust data to obtain 3.0±0.1V
between 7.5IRE and 100IRE level at TP35. (See waveform detail)