Nrs Adjustment; Black Level Adjustment; Pc Pedestal Adjustment; Pc Gain Adjustment - Sanyo PLC-XP41 Service Manual

Electrical Adjustments

NRS adjustment

1. Receive the a6-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
5
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
7
5. Select item no. " " and change data value to adjust
6.5
amplitude "b" to be
(a)

PC Pedestal adjustment

1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
chassis ground (-).
5
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 (-).
15
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 (-).
17
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
TP3671
6
" and change data
2.0
±0.1V.
±0.1V.
(b)
GND
TP531
" (+) and
16
" and change data
TP501
" (+) and
TP561
" (+) and

Black Level adjustment

1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
" (+)
and chassis ground (-).
4. Select group no. "
value to adjust amplitude "a" to be
5. Connect an oscilloscope to test point "
and chassis ground (-).
6. Select item no. "
amplitude "a" to be
7. Connect an oscilloscope to test point "
and chassis ground (-).
8. Select item no. "
amplitude "a" to be

PC Gain adjustment

1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point "
and chassis ground (-).
4. Select group 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 (-).
6. Select item no. "
then decrease data to adjust waveform "a" to be mini-
mum amplitude.
7. Connect an oscilloscope to test point "
and chassis ground (-).
8. Select item no. "
then decrease data to adjust waveform "a" to be mini-
mum amplitude.
-6-
TP531
5 4
", item no. " " and change data
10.0
±0.1V.
TP501
3
" and change data value to adjust
10.0
±0.1V.
TP561
5
" and change data value to adjust
10.0
±0.1V.
black level
(a)
black level
TP531
4 4
", item no. " " and set data value
TP501
5
" and set data value to "600", and
TP561
3
" and set data value to "580", and
White Level
(a)
" (+)
" (+)
" (+)
" (+)
" (+)
" (+)