Sanyo PLC-SL20, Service Manual

Page: 7 / 52

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Electrical Adjustments
1. Receive the 16-step grey scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode
3. Connect a digital voltmeter to test point “
TPGV1
” (+)
and chassis ground (-).
4. Select group no. “
10
”, item no. “
0
” and change data
value to adjust the voltage to be
7.0
±0.05V.
5. Connect a digital voltmeter to test point “
TPRV1
” (+)
and chassis ground (-).
6. Select item no. “
1
” and change data value to adjust
the voltage to be
7.0
±0.05V.
7. Connect a digital voltmeter to test point “
TPBV1
” (+)
and chassis ground (-).
8. Select item no. “
2
” and change data value to adjust
the voltage to be
7.0
±0.05V.
9. Connect a digital voltmeter to test point “
TPGV2
” (+)
and chassis ground (-).
10. Select item no. “
6
” and change data value to adjust
the voltage to be
8.0
±0.05V.
11. Connect a digital voltmeter to test point “
TPRV2
” (+)
and chassis ground (-).
12. Select item no. “
7
” and change data value to adjust
the voltage to be
8.0
±0.05V.
13. Connect a digital voltmeter to test point “
TPBV2
” (+)
and chassis ground (-).
14. Select item no. “
8
” and change data value to adjust
the voltage to be
8.0
±0.05V.
m
Video Center adjustment
1. Receive the 16-step grey scale composite video sig-
nal with Video [Video] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPG1
” (+)
and chassis ground (-).
4. Select group no. “
9
”, item no. “
1
” and adjust the ampli-
tude “a” to be minimum by changing the Data value.
5. Connect an oscilloscope to test point “
TPR1
” (+) and
chassis ground (-).
6. Select item no. “
2
” and adjust the amplitude “a” to be
minimum by changing the Data value.
7. Connect an oscilloscope to test point “
TPB1
” (+) and
chassis ground (-).
8. Select item no. “
3
” and adjust the amplitude “a” to be
minimum by changing the Data value.
(a)
White Level
n
Sub Gain adjustment [Video]
1. Receive the 16-step grey scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPG1
” (+)
and chassis ground (-).
4. Select group no. “
9
”, item no. “
1
” and adjust the ampli-
tude “a” to be
minimum
by changing the Data value.
5. Connect an oscilloscope to test point “
TPR1
” (+) and
chassis ground (-).
6. Select item no. “
2
” and adjust the amplitude “a” to be
minimum
by changing the Data value.
7. Connect an oscilloscope to test point “
TPB1
” (+) and
chassis ground (-).
8. Select item no. “
3
” and adjust the amplitude “a” to be
minimum
by changing the Data value.
(a)
White Level
b
Sub Gain adjustment [PC]
1. Receive the 16-step grey scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPG1
” (+)
and chassis ground (-).
4. Select group no. “
10
”, item no. “
3
” and change data
value to adjust amplitude “a” to be
10.0
±0.1V.
5. Connect an oscilloscope to test point “
TPR1
” (+) and
chassis ground (-).
6. Select item no. “
4
” and change data value to adjust
amplitude “a” to be
10.0
±0.1V.
7. Connect an oscilloscope to test point “
TPB1
” (+) and
chassis ground (-).
8. Select item no. “
5
” and change data value to adjust
amplitude “a” to be
10.0
±0.1V.
(a)
black level
black level
,
Black Reference adjustment