Sub Gain Adjustment [Pc]; Video Center Adjustment; Black Reference Adjustment - Sanyo PLC-SL20 Service Manual

Electrical Adjustments
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 "
and chassis ground (-).
9
4. Select group no. " ", item no. "
minimum
tude "a" to be
5. Connect an oscilloscope to test point "
chassis ground (-).
2
6. Select item no. " " and adjust the amplitude "a" to be
minimum
by changing the Data value.
7. Connect an oscilloscope to test point "
chassis ground (-).
3
8. Select item no. " " and adjust the amplitude "a" to be
minimum
by changing the Data value.
White Level
(a)
n
Sub Gain adjustment [Video]
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 "
and chassis ground (-).
9
4. Select group no. " ", item no. "
tude "a" to be minimum by changing the Data value.
5. Connect an oscilloscope to test point "
chassis ground (-).
2
6. Select item no. " " and adjust the amplitude "a" to be
minimum by changing the Data value.
7. Connect an oscilloscope to test point "
chassis ground (-).
3
8. Select item no. " " and adjust the amplitude "a" to be
minimum by changing the Data value.
White Level
(a)
TPG1
" (+)
1
" and adjust the ampli-
by changing the Data value.
TPR1
" (+) and
TPB1
" (+) and
TPG1
" (+)
1
" and adjust the ampli-
TPR1
" (+) and
TPB1
" (+) and
m

Video Center adjustment

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 "
and chassis ground (-).
4. Select group no. "
value to adjust the voltage to be
5. Connect a digital voltmeter to test point "
and chassis ground (-).
6. Select item no. "
the voltage to be
7. Connect a digital voltmeter to test point "
and chassis ground (-).
8. Select item no. "
the voltage to be
9. Connect a digital voltmeter to test point "
and chassis ground (-).
10. Select item no. "
the voltage to be
11. Connect a digital voltmeter to test point "
and chassis ground (-).
12. Select item no. "
the voltage to be
13. Connect a digital voltmeter to test point "
and chassis ground (-).
14. Select item no. "
the voltage to be
,

Black Reference adjustment

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 "
and chassis ground (-).
4. Select group no. "
value to adjust amplitude "a" to be
5. Connect an oscilloscope to test point "
chassis ground (-).
4
6. Select item no. "
amplitude "a" to be
7. Connect an oscilloscope to test point "
chassis ground (-).
5
8. Select item no. "
amplitude "a" to be
-7-
TPGV1
10 0
", item no. " " and change data
7.0
±0.05V.
TPRV1
1
" and change data value to adjust
7.0
±0.05V.
TPBV1
2
" and change data value to adjust
7.0
±0.05V.
TPGV2
6
" and change data value to adjust
8.0
±0.05V.
TPRV2
7
" and change data value to adjust
8.0
±0.05V.
TPBV2
8
" and change data value to adjust
8.0
±0.05V.
TPG1
10 3
", item no. " " and change data
10.0
±0.1V.
TPR1
" and change data value to adjust
10.0
±0.1V.
TPB1
" and change data value to adjust
10.0
±0.1V.
black level
(a)
black level
" (+)
" (+)
" (+)
" (+)
" (+)
" (+)
" (+)
" (+) and
" (+) and