BOXLIGHT MP-45, Руководство по обслуживанию

Страница: 24 / 130

-24-
1. Receive the 16-step gray scale computer signal with
Input 1 [RGB(Analog)] mode.
2. Enter the service mode.
3. Connect a digital voltmeter to test point “
TP531
” (+)
and chassis ground (-).
4. Select group no. “
4
”, item no. “
6
” and change data
value to adjust the voltage to be
7.50
±0.1Vdc.
5. Connect a digital voltmeter to test point “
TP561
” (+)
and chassis ground (-).
6. Select item no. “
7
” and change data value to adjust
the voltage to be
7.50
±0.1Vdc.
7. Connect a digital voltmeter to test point “
TP501
” (+)
and chassis ground (-).
8. Select item no. “
8
” and change data value to adjust
the voltage to be
7.70
±0.1Vdc.
v
Video Center adjustment
Electrical Adjustments
1. Receive the 16-step gray scale computer signal with
Input 1 [RGB(Analog)] mode.
2. Enter the service mode.
3. Select group no. “
500
”, item no. “
0
” and change data
value to adjust the green noise on the white 0% area
of screen to the first point of the deepest green.
4. Select item no. “
1
” and change data value to adjust
the blue noise on the white 0% area of screen to the
first point of the deepest blue.
4. Select item no. “
2
” and change data value to adjust
the red noise on the white 0% area of screen to the
first point of the deepest red.
n
PC Pedestal 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 “
TP533
” (+) and
chassis ground (-).
4. Select group no. “
4
”, item no. “
18
” and change data
value to adjust amplitude “ a ” to be
10.0
±0.1V.
4. Select item no. “
21
” and change data value to adjust
amplitude “ b ” to be
4.0
±0.1V.
3. Connect an oscilloscope to test point “
TP503
” (+) and
chassis ground (-).
4. Select group no. “
4
”, item no. “
20
” and change data
value to adjust amplitude “ a ” to be
10.0
±0.1V.
5. Select item no. “
23
” and change data value to adjust
amplitude “ b ” to be
4.0
±0.1V.
(a) (b)
b
PSIG 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 “
TP531
” (+) and
chassis ground (-).
4. Select group no. “
4
”, item no. “
0
” and change data
value to adjust waveform “ a ” to be minimum ampli-
tude.
5. Connect an oscilloscope to test point “
TP561
” (+) and
chassis ground (-).
6. Select item no. “
1
” and change data value to adjust
waveform “ a ” to be minimum amplitude.
7. Connect an oscilloscope to test point “
TP501
” (+) and
chassis ground (-).
8. Select item no. “
2
” and change data value to adjust
waveform “ a ” to be minimum amplitude.
(a)
White Level
m
PC Gain adjustment