Sanyo PLC-XE40, Service Manual

Page: 27 / 96

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Electrical Adjustments
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.
4. Select group no. “
9
”, item no. “
127
” and change data
value to obtain the minimum flicker on the screen.
5. Project only red light component to the screen.
6. Select item no. “
128
” and change data value to
obtain the minimum flicker on the screen.
7. Project only blue light component to the screen.
8. Select item no. “
129
and change data value to obtain
the minimum flicker on the screen.
.
Common Center adjustment
1. Receive the 16-step gray scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode, select group no. “
9
” item
no. “
7
” (Red) or “
8
” (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.
⁄1
White Balance adjustment [PC]
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 “
TPG1
” (+) and
chassis ground (-).
4. Select group no. “
9
”, item no. “
124
” and change data
value to adjust amplitude “a” to be
10.0
±0.1V.
5. Connect an oscilloscope to test point “
TPR1
” (+) and
chassis ground (-).
6. Select item no. “
125
” and change data value to
adjust amplitude “a” to be
10.0
±0.1V.
7. Connect an oscilloscope to test point “
TPB1
” (+) and
chassis ground (-).
8. Select item no. “
126
” and change data value to
adjust amplitude “a” to be
9.0
±0.1V.
(a)
black level
black level
,
Black Reference 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 “
TPG1
” (+)
and chassis ground (-).
4. Select group no. “
9
”, item no. “
6
” and change data
value to adjust amplitude “a” to be
1.6
±0.1V.
(a)
white level
white level
⁄0
50% White adjustment [PC]
1. Receive the 16-step grey scale composite signal with
Video [Video] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPG1
” (+) and
chassis ground (-).
4. Select group no. “
9
”, item no. “
0
” and adjust the
amplitude “a” to be
minimum
by changing the Data
value.
5. Connect an oscilloscope to test point “
TPR1
” (+) and
chassis ground (-).
6. Select item no. “
1
” and adjust the amplitude “a” to be
minimum
by changing the Data value.
7. Connect an oscilloscope to test point “
TPB1
” (+) and
chassis ground (-).
8. Select item no. “
2
” and adjust the amplitude “a” to be
minimum
by changing the Data value.
(a)
White Level
m
Gain adjustment [Video]