Read Sharp LC-20VM2E (serv.man2) Service Manual online
14
LC-20VM2E
LC-121M2E
LC-150M2E
LC-150M2E
Adjustment
Adjustment conditions
Adjustment method
1
PAL/SECAM OSC
1. Input the PAL standard color bar
1. Adjust PAL/SECAM OSC so that
adjustment
to AV1.
the screen becomes clear.
(PAL/SECAM OSC)
2
Brightness adjustment
1. Input the PAL standard color bar
1. Adjust PAL BRIGHTNESS, and
(PAL BRIGHTNESS)
to AV1.
adjust the black level of G output
2. Connect oscilloscope to TP821
so as to get DC 0.35
±
0.05V.
(IC316, pin7, G output).
3
Unicolor adjustment
1. Input the PAL standard color bar
1. Adjust PAL UNICOLOR so as to get
(PAL UNICOLOR)
to AV1.
2.3
±
0.05Vp-p between the 100%
2. Connect oscilloscope to TP821
white and GND.
(IC316, pin7 , G output).
4
Color level adjustment
1. Input the PAL standard color bar
1. Adjust PAL SCOLOR so as to get
(PAL SCOLOR)
to AV1.
the color bar signal blue amplitude
2. Connect oscilloscope to TP820
(GND - peak level) equal to 1.8V
±
(B output).
0.1Vp-p.
5
Tint adjustment
1. DAC value is set in "62".
(PAL TINT)
6
Scanning conversion
1. Short-circuit between TP4101 and
1. Adjust the frequency to 15.625
±
oscillation adjustment
GND.
0.01kHz by rotating L4101.
(L4101)
2. Connect frequency counter TP4102
and GND.
7
PAL-Y level adjustment
1. Input the PAL standard color bar
1. Adjust between GND and the white
(R4162)
to AV1.
100% to 2.3V.
2. Connect oscilloscope to TP802
(B output).
6-6-3. PAL signal adjustment
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