Sanyo PLC-XP46 Service Manual page 27

A/D Offset adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
chassis ground (-).
6
4. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
5. Connect an oscilloscope to test point "
chassis ground (-).
12
6. Select item no. " " and change data value to adjust
the pedestal level and black level to be the same
level.
7. Connect an oscilloscope to test point "
chassis ground (-).
10
8. Select item no. " and change data value to adjust
the pedestal level and black level to be the same
level.
Pedestal Lebel = Black Lebel
Video Gain adjustment
1. Receive the 16-step gray scale video signal with Input
3 [VIDEO] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
4
4. Select group no. " ", item no. "
to "600", and then decrease data to adjust waveform
"a" to be minimum amplitude.
5. Connect an oscilloscope to test point "
and chassis ground (-).
5
6. Select item no. " " and set data value to "600", and
then decrease data to adjust waveform "a" to be mini-
mum amplitude.
7. Connect an oscilloscope to test point "
and chassis ground (-).
3
8. Select item no. " " and set data value to "580", and
then decrease data to adjust waveform "a" to be mini-
mum amplitude.
White Level
TP531
" (+) and
11
" and change data
TP501
" (+) and
TP561
" (+) and
TP531
" (+)
4
" and set data value
TP501
" (+)
TP561
" (+)
(a)
-27-
Video Gamma Shift adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO] mode.
2. Enter the service mode.
4
3. Select group no. " ", item no. "
value to reproduce the proper gray scale picture on
the screen.
Common Center adjustment
1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
3. Project only green light component to the screen.
5
4. Select group no. " ", item no. "
value to obtain the minimum flicker on the screen.
5. Project only blue light component to the screen.
12
6. Select item no. " " and change data value to obtain
the minimum flicker on the screen.
7. Project only red light component to the screen.
10
8. Select item no. " " and change data value to obtain
the minimum flicker on the screen.
White Balance adjustment
[PC WHITE BALANCE ADJUSTMENT]
1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
4
3. Select group no. " ", item no. "
and change data values respectively to make a prop-
er white balance.
[AV WHITE BALANCE ADJUSTMENT]
4. Receive the 16-step gray scale video signal with
Input 3 [VIDEO] mode.
5. Enter the service mode.
4
6. Select group no. " ", item no. "
and change data values respectively to make a prop-
er white balance.
Confirm that the same white balance is obtained in
video and computer input.
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. The software can be ordered as follows;
COLOR SHADING CORRECTION SOFTWARE
Service Parts No.
6
" and change data
11
" and change data
7 8
" (Red) or " " (Blue),
7 8
" (Red) or " " (Blue),
645 051 2308