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Electrical Adjustments
,
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 "
and chassis ground (-).
4
4. Select group no. "
", item no. "
value to adjust waveform "a" to be minimum ampli-
tude.
5. Connect an oscilloscope to test point "
and chassis ground (-).
4
6. Select item no. "
" and change data value to adjust
waveform "a" to be minimum amplitude.
7. Connect an oscilloscope to test point "
and chassis ground (-).
5
8. Select item no. "
" and change data value to adjust
waveform "a" to be minimum amplitude.
White Level
(a)
.
PC signal offset 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 "
and chassis ground (-).
4
4. Select group no. "
", item no. "
1.5
amplitude "a" to be
value.
white level
(a)
TP35G
" (+)
3
" and change data
TP35B
" (+)
TP35R
" (+)
TP35G
" (+)
6
" and adjust the
±0.1V by changing the Data
white level
⁄0
Video A/D reference voltage (bottom
side) adjustment
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 "
and chassis ground (-).
5
4. Select group no. "
value to adjust the voltage to be
⁄1
Video Y pedestal adjustment
1. Receive the black 0% composite video signal with
Input 3 [Video] mode.
2. Enter the service mode.
5
3. Select group no. "
value to adjust the green noise on the screen to the
deepest green.
⁄2
Video A/D reference voltage (top
side) adjustment
1. Receive the white 100% composite video signal with
Input 3 [Video] mode.
2. Enter the service mode.
5
3. Select group no. "
value to adjust the magenta noise on the screen to
the deepest magenta.
⁄3
Video Cb/Cr pedestal adjustment
1. Receive the black 0% composite video signal with
Input 3 [Video] mode.
2. Enter the service mode.
5
3. Select group no. "
value to adjust the blue noise on the screen to the
deepest blue.
5
4. Select group no. "
value to adjust the red noise on the screen to the
deepest red.
-9-
TPVRB
17
", item no. "
" and change data
0.70
±0.02Vdc.
11
", item no. "
" and change data
18
", item no. "
" and change data
12
", item no. "
" and change data
13
", item no. "
" and change data
" (+)
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