Sanyo PLC-SU50, Service Manual

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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 “
TPG1
” (+)
and chassis ground (-).
4. Select group no. “
10
”, item no. “
0
” and change data
value to adjust the voltage to be
7.50
±0.05V.
5. Connect a digital voltmeter to test point “
TPR1
” (+)
and chassis ground (-).
6. Select item no. “
1
” and change data value to adjust
the voltage to be
7.50
±0.05V.
7. Connect a digital voltmeter to test point “
TPB1
” (+)
and chassis ground (-).
8. Select item no. “
2
” and change data value to adjust
the voltage to be
7.50
±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
6n
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 gray scale computer signal with
Computer2 [RGB] mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TPPSIG
” (+)
and chassis ground (-).
4. Select group no. “
10
”, item no. “
14
” and adjust the
amplitude “a” to be
10.0
±0.1V by changing the Data
value.
5. Select item no. “
17
” and adjust the amplitude “b” to be
3.8
±0.1V by changing the Data value.
3. Connect an oscilloscope to test point “
TPZPSIG
” (+)
and chassis ground (-).
4. Select group no. “
10
”, item no. “
12
” and adjust the
amplitude “a” to be
10.0
±0.1V by changing the Data
value.
5. Select item no. “
15
” and adjust the amplitude “b” to be
3.8
±0.1V by changing the Data value.
(a) (b)
,
PSIG adjustment