Sanyo PLC-XP46 Service Manual page 26

Electrical Adjustments
HDTV Gain 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 (-).
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 "600", and
then decrease data to adjust waveform "a" to be mini-
mum amplitude.
White Level
TP531
" (+)
4
" and set data value
TP501
" (+)
TP561
" (+)
(a)
-26-
VIDEO Pedestal 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 (-).
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
VIDEO A/D Input 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 (-).
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
0.8
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
0.8
amplitude "a" to be
(a)
Note: This adjustment should be done after VIDEO
Pedestal adjustment.
TP4151G
1
" and change data
TP4151B
14
" and change data
TP4151R
TP4151G
0
" and change data
0.8
±0.1V.
TP4151B
±0.1V.
TP4151R
±0.1V.
" (+)
" (+)
" (+)
" (+)
" (+)
" (+)