Sanyo PLC-XP46 Service Manual page 25

Electrical Adjustments
PC Gamma Shift 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. "
value to reproduce the proper gray scale picture on
the screen.
HDTV Pedestal adjustment
[480p-PEDESTAL ADJUSTMENT]
1. Receive the 16-step gray scale component signal
[480p] with Input 3 [COMPONENT] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
3
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 "
and chassis ground (-).
5
6. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
7. Connect an oscilloscope to test point "
and chassis ground (-).
13
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
[1080i-PEDESTAL ADJUSTMENT]
1. Receive the 16-step gray scale component signal
[1080i] with Input 3 [COMPONENT] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
3
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 "
and chassis ground (-).
14
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 "
and chassis ground (-).
6
" and change data
TP21G
" (+)
1
" and change data
TP21B
" (+)
14
" and change data
TP21R
" (+)
TP21G
" (+)
1
" and change data
TP21B
" (+)
TP21R
" (+)
-25-
13
8. Select item no. " and change data value to adjust
the pedestal level and black level to be the same
level.
HDTV A/D Input adjustment
[480p-A/D INPUT ADJUSTMENT]
1. Receive the 16-step gray scale component signal
[480p] with Input 3 [COMPONENT] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
3
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
5. Connect an oscilloscope to test point "
and chassis ground (-).
4
6. Select item no. " " and change data value to adjust
0.9
amplitude "a" to be
7. Connect an oscilloscope to test point "
and chassis ground (-).
2
8. Select item no. " and change data value to adjust
0.9
amplitude "a" to be
(a)
[1080i-A/D INPUT ADJUSTMENT]
1. Receive the 16-step gray scale component signal
[1080i] with Input 3 [COMPONENT] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
3
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
5. Connect an oscilloscope to test point "
and chassis ground (-).
4
6. Select item no. " " and change data value to adjust
0.9
amplitude "a" to be
7. Connect an oscilloscope to test point "
and chassis ground (-).
2
8. Select item no. " and change data value to adjust
0.9
amplitude "a" to be
(a)
Note: This adjustment should be done after HDTV
Pedestal adjustment.
TP21G
" (+)
0
" and change data
0.9
±0.1V.
TP21B
" (+)
±0.1V.
TP21R
" (+)
±0.1V.
TP21G
" (+)
0
" and change data
0.9
±0.1V.
TP21B
" (+)
±0.1V.
TP21R
" (+)
±0.1V.