-11-
1. Receive the 16-step gray scale composite video sig-
nal 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. “
5
”, item no. “
17
” and change data
value to adjust the voltage to be
0.70
±0.02Vdc.
⁄0
Video A/D reference voltage (bottom
side) adjustment
1. Receive the black 0% composite video signal with
Input 3 [Video]
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.
1. Receive the white 100% composite video signal with
Input 3 [Video]
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.
1. Receive the black 0% composite video signal with
Input 3 [Video]
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 group no. “
5
”, item no. “
13
” and change data
value to adjust the
red
noise on the screen to the
deepest red.
⁄3
Video Cb/Cr pedestal adjustment
⁄1
Video Y pedestal adjustment
⁄2
Video A/D reference voltage (top
side) adjustment
1. Receive the 16-step gray scale computer signal with
Input 1 [RGB(Analog)]
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
,
PC gain adjustment
1. Receive the 16-step gray scale computer signal with
Input 1 [RGB(Analog)]
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
.
PC signal offset adjustment
Electrical Adjustments