-25-
Electrical Adjustments
1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER]
mode.
2. Enter the service mode.
3. Select group no. “
10
”, item no. “
6
” and change data
value to reproduce the proper gray scale picture on
the screen.
PC Gamma Shift adjustment
1. Receive the 16-step gray scale computer signal with
Input 3 [VIDEO]
mode.
2. Enter the service mode.
3. Connect a digital voltmeter to test point “
TPVRB
” (+)
and chassis ground (-).
4. Select group no. “
11
”, item no. “
11
” and change data
value to adjust the voltage to be
0.7
±0.1Vdc.
5. Connect a digital voltmeter to test point “
TPGVRT
”
(+) and chassis ground (-).
6. Select item no. “
12
” and change data value to adjust
the voltage to be
2.2
±0.1Vdc.
A/D Reference adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP13G
” (+)
and chassis ground (-).
4. Select group no. “
2
”, item no. “
0
” and change data
value to adjust the pedestal level and black level to be
the same level.
Pedestal Lebel = Black Lebel
AV Pedestal adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP13G
” (+)
and chassis ground (-).
4. Select group no. “
2
”, item no. “
1
” and change data
value to adjust amplitude “a” to be
1.35
±0.1V. If not,
use item no. “
1
” for fine adjustment.
5. Connect an oscilloscope to test point “
TP13B
” (+)
and chassis ground (-).
6. Select item no. “
3
” and change data value to adjust
amplitude “a” to be
1.35
±0.1V.
7. Connect an oscilloscope to test point “
TP13R
” (+)
and chassis ground (-).
8. Select item no. “
4
” and change data value to adjust
amplitude “a” to be
1.35
±0.1V.
Note: This adjustment should be done after VIDEO
Pedestal adjustment.
(a)
A/D Input adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP531
” (+) and
chassis ground (-).
4. Select group no. “
11
”, item no. “
15
” 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. “
16
” 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. “
17
” and change data value to adjust
the pedestal level and black level to be the same
level.
Pedestal Lebel = Black Lebel
Video Pedestal adjustment
Summary of Contents for PLV-70
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