Common Center Adjustment; Black Reference Adjustment - Sanyo PLC-XL40 Service Manual

Electrical Adjustments
m
Gain adjustment [Video]
1. Receive the 16-step grey scale composite signal with
Video [Video] mode.
. Enter the service mode.
3. Connect an oscilloscope to test point "
chassis ground (-).
9
4. Select group no. " ", item no. "
minimum
amplitude "a" to be
value.
5. Connect an oscilloscope to test point "
chassis ground (-).
1
6. Select item no. " " and adjust the amplitude "a" to be
minimum
by changing the Data value.
7. Connect an oscilloscope to test point "
chassis ground (-).
2
8. Select item no. " " and adjust the amplitude "a" to be
minimum
by changing the Data value.
White Level
(a)
,

Black Reference adjustment

1. Receive the 16-step grey scale computer signal with
Computer2 [RGB] mode.
. Enter the service mode.
3. Connect an oscilloscope to test point "
chassis ground (-).
9
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
5. Connect an oscilloscope to test point "
chassis ground (-).
125
6. Select item no. " " and change data value to
adjust amplitude "a" to be
7. Connect an oscilloscope to test point "
chassis ground (-).
126
8. Select item no. " " and change data value to
adjust amplitude "a" to be
tPG1
" (+) and
0
" and adjust the
by changing the Data
tPR1
" (+) and
tPB1
" (+) and
tPG1
" (+) and
124
" and change data
10.0
±0.1V.
tPR1
" (+) and
10.0
±0.1V.
tPB1
" (+) and
9.0
±0.1V.
black level
(a)
black level

. Common Center adjustment

1. Receive the 1 line black/white pattern computer sig-
nal with Computer2 [RGB] mode.
. Enter the service mode.
3. Project only green light component to the screen.
9
4. Select group no. "
value to obtain the minimum flicker on the screen.
5. Project only red light component to the screen.
128
6. Select item no. "
obtain the minimum flicker on the screen.
7. Project only blue light component to the screen.
129
8. Select item no. "
the minimum flicker on the screen.
⁄0
50% White adjustment [PC]
1. Receive the 16-step grey scale computer signal with
Computer2 [RGB] mode.
. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
9
4. Select group no. "
value to adjust amplitude "a" to be
white level
⁄1
White Balance adjustment [PC]
1. Receive the 16-step gray scale computer signal with
Computer2 [RGB] mode.
. Enter the service mode, select group no. "
7 8
no. " " (Red) or "
respectively to make a proper white balance.
Confirm that the same white balance is obtained in
video and computer input.
-7-
127
", item no. " " and change data
" and change data value to
and change data value to obtain
tPG1
6
", item no. " " and change data
1.6
±0.1V.
(a)
white level
9
" (Blue), and change Data values
" (+)
" item