Sanyo PLC-XE50, Service Manual

Page: 44 / 126

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Service Adjustment
Gain adjustment [Component]
1. Enter the service mode.
2. Receive the Color Bar 480i-component signal with
Video
[Component]
mode.
3. Connect an oscilloscope to test point “
TP35G
” (+) and
chassis ground (-).
4. Select group no. “
0
”, item no. “
3
” and adjust the amplitude
“
a
” to be minimum by changing the Data value.
(a)
White Level
1. Enter the service mode.
2. Receive the 16-step grey scale composite video signal
with
Video [Video]
mode.
3. To start the auto-calibration for Component adjustment,
select group no. “
260
”, item no. “
0
” and then change data
value from “
0
” to “
1
”. After the auto-calibration complet-
ed, "OK" will appear on the screen.
4. Auto Calibration adjustment [Video]
Gain adjustment [Video]
1. Enter the service mode.
2. Receive the 16-step grey scale composite video signal with
Video [Video]
mode.
3. Connect an oscilloscope to test point “
TP35G
” (+) and
chassis ground (-).
4. Select group no. “
20
”, item no. “
0
” and adjust the ampli-
tude “
a
” to be minimum by changing the Data value.
(a)
White Level
below adjustment is performed when the above auto cali-
bration is failed.
Pedestal adjustment [Component]
1. Enter the service mode.
2. Receive the Color Bar 480i-component signal with
Video
[Component]
mode.
3. Connect an oscilloscope to test point “
TP35G
” (+) and
chassis ground (-).
4. Select group no. “
0
”, item no. “
0
” and change data value
to adjust the pedestal level and black level to be the same
level.
5. Connect an oscilloscope to test point “
TP35R
” (+) and
chassis ground (-).
6. Select item no. “
1
” and change data value to adjust the
pedestal level and black level to be the same level.
7. Connect an oscilloscope to test point “
TP35B
” (+) and
chassis ground (-).
8. Select item no. “
2
” and change data value to adjust the
pedestal level and black level to be the same level.
P
edestal Lebel
Blac
k Lebel
1. Enter the service mode.
2. Receive the Color Bar 480i-component signal with
Video
[Component]
mode.
3. To start the auto-calibration for Component adjustment,
select group no. “
260
”, item no. “
0
” and then change data
value from “
0
” to “
1
”. After the auto-calibration complet-
ed, "OK" will appear on the screen.
5. Auto Calibration adjustment [Component]
Below adjustments are performed when the above auto
calibration is failed.