Sharp LC-20VM2E Service Manual page 14

LC-20VM2E
6-6-3. PAL signal adjustment
Adjustment
1 PAL/SECAM OSC
adjustment
(PAL/SECAM OSC)
2 Brightness adjustment
(PAL BRIGHTNESS)
3 Unicolor adjustment
(PAL UNICOLOR)
4 Color level adjustment
(PAL SCOLOR)
5 Tint adjustment
(PAL TINT)
6 Scanning conversion
oscillation adjustment
(L4101)
7 PAL-Y level adjustment
(R4162)
Adjustment conditions
1. Input the PAL standard color bar
to AV1.
1. Input the PAL standard color bar
to AV1.
2. Connect oscilloscope to TP821
(IC316, pin7, G output).
1. Input the PAL standard color bar
to AV1.
2. Connect oscilloscope to TP821
(IC316, pin7 , G output).
1. Input the PAL standard color bar
to AV1.
2. Connect oscilloscope to TP820
(B output).
1. Short-circuit between TP4101 and
GND.
2. Connect frequency counter TP4102
and GND.
1. Input the PAL standard color bar
to AV1.
2. Connect oscilloscope to TP802
(B output).
14
Adjustment method
1. Adjust PAL/SECAM OSC so that
the screen becomes clear.
1. Adjust PAL BRIGHTNESS, and
adjust the black level of G output
so as to get DC 0.35±0.05V.
1. Adjust PAL UNICOLOR so as to get
2.3±0.05Vp-p between the 100%
white and GND.
1. Adjust PAL SCOLOR so as to get
the color bar signal blue amplitude
(GND - peak level) equal to 1.8V ±
0.1Vp-p.
1. DAC value is set in "62".
1. Adjust the frequency to 15.625±
0.01kHz by rotating L4101.
1. Adjust between GND and the white
100% to 2.3V.
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