Sanyo PLC-XU32, Service Manual

Page: 28 / 112

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Electrical Adjustments
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER mode.
3. Enter the service mode.
[R-GAIN ADJUSTMENT]
4. Connect an oscilloscope to test point “
TP25R1
” (+)
and chassis ground (-).
5. Select group no. “
2
”, item no. “
3
” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
[G-GAIN ADJUSTMENT]
6. Connect an oscilloscope to test point “
TP25G1
” (+)
and chassis ground (-).
7. Select group no. “
2
”, item no. “
4
” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
[B-GAIN ADJUSTMENT]
8. Connect an oscilloscope to test point “
TP25B1
” (+)
and chassis ground (-).
9. Select group no. “
2
”, item no. “
5
” and change data
value to adjust waveform “a” to be minimum ampli-
tude.
White Level
(a)
PC Gain adjustment
1. Receive the 16-step gray scale computer signal.
2. Set to
COMPUTER mode.
3. Enter the service mode.
[R-OFFSET ADJUSTMENT]
4. Connect an oscilloscope to test point “
TP25R1
” (+)
and chassis ground (-).
5. Select group no. “
3
”, item no. “
11
” and change data
value to adjust the waveform “a” (black portion ) to
be maximum amplitude.
[G-OFFSET ADJUSTMENT]
6. Connect an oscilloscope to test point “
TP25G1
” (+)
and chassis ground (-).
7. Select group no. “
3
”, item no. “
12
” and change data
value to adjust the waveform “a” (black portion ) to
be maximum amplitude.
[B-OFFSET ADJUSTMENT]
8. Connect an oscilloscope to test point “
TP25B1
” (+)
and chassis ground (-).
9. Select group no. “
3
”, item no. “
13
” and change data
value to adjust the waveform “a” (black portion ) to
be maximum amplitude.
Black Level
(a)
PC Offset adjustment