-12-
1. Receive the 16-step gray scale composite video sig-
nal with
Input 3 [video]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP35G
” (+)
and chassis ground (-).
4. Select group no. “
4
”, item no. “
3
” and change data
value to adjust waveform “
a
” to be minimum ampli-
tude.
5. Connect an oscilloscope to test point “
TP35B
” (+)
and chassis ground (-).
6. Select item no. “
4
” and change data value to adjust
waveform “
a
” to be minimum amplitude.
7. Connect an oscilloscope to test point “
TP35R
” (+)
and chassis ground (-).
8. Select item no. “
5
” and change data value to adjust
waveform “
a
” to be minimum amplitude.
(a)
White Level
⁄4
Video gain adjustment
1. Receive the black 0% component 480i video signal
with
Input 3 [Component]
mode.
2. Enter the service mode.
3. Select group no. “
5
”, item no. “
11
” and change data
value to adjust the
green
noise on the screen to the
deepest green.
⁄6
Component Y pedestal adjustment
1. Receive the white 100% component 480i video signal
with
Input 3 [Component]
mode.
2. Enter the service mode.
3. Select group no. “
5
”, item no. “
18
” and change data
value to adjust the
magenta
noise on the screen to
the deepest magenta.
⁄7
Component A/D reference voltage
(top side) adjustment
1. Receive the black 0% component 480i video signal
with
Input 3 [Component]
mode.
2. Enter the service mode.
3. Select group no. “
5
”, item no. “
12
” and change data
value to adjust the
blue
noise on the screen to the
deepest blue.
4. Select item no. “
13
” and change data value to adjust
the
red
noise on the screen to the deepest red.
⁄8
Component Cb/Cr pedestal adjustment
1. Receive the 16-step gray scale component 480i sig-
nal with
Input 3 [Component]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP35G
” (+)
and chassis ground (-).
4. Select group no. “
4
”, item no. “
3
” and change data
value to adjust waveform “
a
” to be minimum amplitude.
5. Connect an oscilloscope to test point “
TP35B
” (+)
and chassis ground (-).
6. Select item no. “
4
” and change data value to adjust
waveform “
a
” to be minimum amplitude.
7. Connect an oscilloscope to test point “
TP35R
” (+)
and chassis ground (-).
8. Select item no. “
5
” and change data value to adjust
waveform “
a
” to be minimum amplitude.
(a)
White Level
⁄9
Component gain adjustment
1. Receive the 16-step gray scale composite video sig-
nal with
Input 3 [video]
mode.
2. Enter the service mode.
3. Connect an oscilloscope to test point “
TP35G
” (+)
and chassis ground (-).
4. Select group no. “
4
”, item no. “
6
” and adjust the
amplitude “
a
” to be
1.5
±0.1V by changing the Data
value.
(a)
white level
white level
⁄5
Video signal offset adjustment
Electrical Adjustments