Sanyo PLC-XU56 Service Manual page 25

Electrical Adjustments
.
NRS adjustment
1. Receive the 16-step gray scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
chassis ground (-).
10
4. Select group no. " ", item no. "
4.5
amplitude "a" to be
Data value.
15
5. Select item no. " " and adjust the amplitude "b" to be
0.0
±0.1Vp-p by changing the Data value.
(a)
⁄0
Common Center adjustment
1. Receive the 1 line black/white pattern computer sig-
nal with Computer2 [RGB] mode.
2. Enter the service mode.
3. Project only green light component to the screen.
10
4. Select group no. " ", item no. "
value to obtain the minimum flicker on the screen.
5. Project only red light component to the screen.
10
6. Select item no. " " and change data value to obtain
the minimum flicker on the screen.
7. Project only blue light component to the screen.
11
8. Select item no. " and change data value to obtain
the minimum flicker on the screen.
NOTE ON WHITE UNIFORMITY
ADJUSTMENT
If you find the color shading on the screen, please
adjust the white uniformity by using the proper comput-
er and "Color Shading Correction" software supplied
separately.
TPG1
" (+) and
12
" and adjust the
±0.1Vp-p by changing the
(b)
9
" and change data
-25-
⁄1
Gamma adjustment
[PC-GAMMA ADJUSTMENT]
1. Receive the 16-step grey scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
9
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
[AV-GAMMA ADJUSTMENT]
1. Receive the 16-step grey scale video signal with
Video [Video] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
9
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
white level
⁄2
White Balance adjustment
[PC WHITE BALANCE ADJUSTMENT]
1. Receive the 16-step gray scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode, select group no. "
11 12
" " (Red) or " " (Blue), and change Data values
respectively to make a proper white balance.
[AV WHITE BALANCE ADJUSTMENT]
1. Receive the 16-step gray scale composite video sig-
nal with Video [Video] mode.
2. Enter the service mode, select group no. "
11 12
" " (Red) or " " (Blue), and change Data values
respectively to make a proper white balance.
Confirm that the same white balance is obtained in
video and computer input.
The software can be ordered as follows;
COLOR SHADING CORRECTION ver. 3.03
Service Parts No.
TPG1
" (+)
10
" and change data
1.8
±0.1V.
TPG1
" (+)
10
" and change data
1.8
±0.1V.
(a)
white level
9
" item no.
9
" item no.
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