Sanyo PLV-70 Service Manual page 25

Electrical Adjustments
PC Gamma Shift adjustment
1. Receive the 16-step gray scale computer signal with
Input 1 [COMPUTER] mode.
2. Enter the service mode.
10
3. Select group no. " ", item no. "
value to reproduce the proper gray scale picture on
the screen.
A/D Reference 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 "
and chassis ground (-).
11
4. Select group no. " ", item no. "
value to adjust the voltage to be
5. Connect a digital voltmeter to test point "
(+) and chassis ground (-).
12
6. Select item no. " " and change data value to adjust
2.2
the voltage to be ±0.1Vdc.
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 "
and chassis ground (-).
2
4. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
Pedestal Lebel = Black Lebel
6
" and change data
TPVRB
" (+)
11
" and change data
0.7
±0.1Vdc.
TPGVRT
"
TP13G
" (+)
0
" and change data
-25-
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 "
and chassis ground (-).
2
4. Select group no. " ", item no. "
value to adjust amplitude "a" to be
1
use item no. " " for fine adjustment.
5. Connect an oscilloscope to test point "
and chassis ground (-).
3
6. Select item no. " " and change data value to adjust
1.35
amplitude "a" to be
7. Connect an oscilloscope to test point "
and chassis ground (-).
4
8. Select item no. " " and change data value to adjust
1.35
amplitude "a" to be
(a)
Note: This adjustment should be done after VIDEO
Pedestal adjustment.
Video 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 "
chassis ground (-).
11
4. Select group no. " ", item no. "
value to adjust the pedestal level and black level to be
the same level.
5. Connect an oscilloscope to test point "
chassis ground (-).
16
6. Select item no. " " and change data value to adjust
the pedestal level and black level to be the same
level.
7. Connect an oscilloscope to test point "
chassis ground (-).
17
8. Select item no. " " and change data value to adjust
the pedestal level and black level to be the same
level.
Pedestal Lebel = Black Lebel
TP13G
" (+)
1
" and change data
1.35
±0.1V. If not,
TP13B
" (+)
±0.1V.
TP13R
" (+)
±0.1V.
TP531
" (+) and
15
" and change data
TP501
" (+) and
TP561
" (+) and