Sanyo PLV-70, Service Manual

Page: 24 / 104

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Electrical Adjustments
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 “
TP531
” (+) and
chassis ground (-).
4. Select group no. “
500
”, item no. “
0
” and change data
value to adjust the pedestal level and black level to be
the same level.
5. Connect an oscilloscope to test point “
TP501
” (+) and
chassis ground (-).
6. Select item no. “
1
” and change data value to adjust
the pedestal level and black level to be the same
level.
7. Connect an oscilloscope to test point “
TP561
” (+) and
chassis ground (-).
8. Select item no. “
2
” and change data value to adjust
the pedestal level and black level to be the same
level.
Pedestal Lebel = Black Lebel
PC Pedestal 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 “
TP3671
” (+)
and chassis ground (-).
4. Select group no. “
11
”, item no. “
3
” and change data
value to adjust amplitude “a” to be
2.0
±0.1V.
5. Select item no. “
4
” and change data value to adjust
amplitude “b” to be
7.5
±0.1V.
(a)
(b)
GND
NRS 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 “
TP531
” (+)
and chassis ground (-).
4. Select group no. “
11
”, item no. “
8
” and change data
value to adjust amplitude “a” to be
10.0
±0.1V.
5. Connect an oscilloscope to test point “
TP501
” (+)
and chassis ground (-).
6. Select item no. “
9
” and change data value to adjust
amplitude “a” to be
10.0
±0.1V.
7. Connect an oscilloscope to test point “
TP561
” (+)
and chassis ground (-).
8. Select item no. “
10
” and change data value to adjust
amplitude “a” to be
10.0
±0.1V.
(a)
black level
black level
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 “
TP531
” (+)
and chassis ground (-).
4. Select group no. “
10
”, item no. “
3
” and set data value
to “600”, and then decrease data to adjust waveform
“a” to be minimum amplitude.
5. Connect an oscilloscope to test point “
TP501
” (+)
and chassis ground (-).
6. Select item no. “
4
” 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 “
TP561
” (+)
and chassis ground (-).
8. Select item no. “
5
” and set data value to “580”, and
then decrease data to adjust waveform “a” to be mini-
mum amplitude.
White Level
(a)
PC Gain adjustment