Service adjustments (electronic controls)
Sub-Contrast adjustmentTint/Color adjustment
Service DAC Adjustment (BRIGH, CONT)Service DAC adjustment (TINT) (COLOR)
This adjustment is factorDoy snet.ot adjustunless
Preparation:
repairs are made to associated circuit, the CRT1.BoaAprdply a rainbow color bar signal.
or when the CRT is replaced.2. Preset the following controls:
Preparation:? Brightness . . . . . . . Min.
1. Apply a color-bar pattern.? Color... .... ... .. Center.
2. Set the picture settings to normal and color? toTint . ... .... ... .. Center.
minimum.? Picture . .... ... .. Max.
3. Connect the oscilloscope to TP47G.? Sharpness . . . . . . . Min.
3.Connect a jumper from TPD2 to GND ( ).
4. Connect a jumper from TPD2 to cold ground ().
Procedure:
Procedure:
1.Connect the oscilloscope to TP47B (A-Board).
1. In the service mode, select DAC ?BRIGH? forsub-
brightness to obtain 2.3?0.1V between 7.5IR2.E andIn the service mode, select ?TINT DAC Sub-Tint
adjustment. Adjust until the waveform measured is
GND level at TP47G (see Fig. 25)
asthe one shown in Fig. 26.
2. In the service mode, select DAC ?CONT? for sub-
contrast to obtain 3.0?0.1V between 7.5IRE and
100IRE level at TP47GA
B
TP47B (A-Board)
3. Remove short jumperC
4. Set the picture settings to normal..
1 2 3 10
White4 5 6 7 8 9
A to B = 1 unit
100IRE
YellowB to C = 2 units
CyanA
Green
Magenta3.0 ? 0.1Vpp
Red
Figure 26.TP47B waveform
Blue
7.5IRE
Black
3. Connect the oscilloscope to TP47G (TP35) and
2.3? 0.1Vppcold GND.
4. Select DAC Sub-Color adjustment ?COLOR? and
GNDadjust for peak to peak amplitude to be
Figure 25.Waveform
1.3Vp-p ?0.1Vas shown in Fig. 27.
Sub-BrightnessTP47G (A-Board)
Service DAC adjustment(BRIGH)
Adjustment of this control is important for setting prop1 2 3 4 5 6er
1.3?0.1Vp-p
operation of customer brightness and picture controls.
7 8 9 10
Do not adjustthe SCREEN VR after the Sub-
Brightness is set.
Preparation:Figure 27.TP47G waveform
1. Set the picture settings to normal and color to
minimum (no color in picture).5. Remove short jumper.
2. Switch COLOR TEMPERATURE to NORMAL.
Procedure:
1. Apply a color-bar pattern.
2. In the service mode for making electronic
adjustments, select the DAC adjustment ?BRIGH?
and adjust data so that 7.5IRE part is the same
light output as the 3IRE part.
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ACEC
