Panasonic CT-32SX31CE Service Manual

Also see for CT-32SX31E: Operating instructions Service manual

Panasonic CT-32SX31CE Service Manual Manual pdf 27 page image

- 27 -Service Adjustments (Electronic Controls)Sub-Contrast AdjustmentServiceman DAC Adjustment (B02, B03)This adjustment is factory set. Do not adjust unlessrepairs are made to associated circuit, the CRT Boardor when the CRT is replaced.Preparation:1. Apply a Black-White pattern.2. Set the picture settings to normal and color tominimum.3. RGB GAMMA (S03) DAC from 1 to 04. 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 andGND 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 and100IRE level at TP47G3. Remove short jumper and set RGB GAMMA (S03)DAC to 1.4. Set the picture settings to normal..Sub-Brightness (B02)Adjustment of this control is important for setting properoperation 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 electronicadjustments, select the DAC adjustment (B02) andadjust data so that 7.5IRE part is the same lightoutput as the 3IRE part (See Fig. 26).Tint/Color AdjustmentServiceman 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 04. Connect the oscilloscope to TP47B (A-Board).5. Connect a jumper from TPD2 to GND ( ).Procedure:1. In the Serviceman Mode for making electronicadjustments, select (B01) DAC Sub-TintAdjustment. Adjust until the waveform measured isas the one shown in Fig. 27.2. Connect the oscilloscope to TP47G or TP35 (L-Board) and cold GND.3. Select DAC Sub-Color Adjustment (B00) andadjust for peak to peak amplitude to be0.50Vp-p ±0.05V as shown in Fig .28.4. Remove short jumper and set RGB GAMMA (S03)DAC to 1.PIP Sub-Contrast Adjustment (P03)100IRE7.5IREGNDFigure 25. waveform1.5±0.1V2.6 v± 0.1V3 IRE7.5 IREFigure 26. PatternA to B = 1 unitAC1 2 3 104 5 6 7 8 9BB to C = 2 unitsFigure 27. TP47B waveformTP47B (A-Board)A1 2 3 4 5 67 8 9 10Figure 28. TP47G waveformTP47G (A-Board)0.50Vp-p±0.05V