16.3 (NTSC) Sub-Contrast
Service DAC adjustment (CUT-G, CONT)

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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 colorbar pattern.

2. Set the PICTURE settings to normal.

3. Set color to minimum (no color on picture).

4. Set PICTURE mode to VIVID

5. Connect the oscilloscope to TP47G.

Procedure

1. In the service mode, select DAC for brightness adjustment “BRIGH” and set data to “1 D0”.

2. In service mode, select DAC for green cutoff adjustment “CUT-G”, and adjust data to obtain 2.2 V between 7.5IRE and GND level at TP47G. (See waveform detail)

3. In service mode, select DAC for contrast adjustment “CONT”, and adjust data to obtain 2.3±0.1V between 7.5IRE and 100IRE level at TP47G. (See waveform detail)

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