BOXLIGHT MP-45, Руководство по обслуживанию

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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. “
12
” and change data
value to adjust amplitude “ a ” to be
9.8
±0.1V.
(a)
black level
black level
.
PC black Level adjustment
1. Receive the 16-step gray scale video 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. “
9
” and change data
value to adjust amplitude “ a ” to be
4.0
±0.1V.
5. Connect an oscilloscope to test point “
TP561
” (+) and
chassis ground (-).
6. Select item no. “
10
” and change data value to adjust
amplitude “ a ” to be
4.0
±0.1V.
7. Connect an oscilloscope to test point “
TP501
” (+) and
chassis ground (-).
8. Select item no. “
11
” and change data value to adjust
amplitude “ a ” to be
4.0
±0.1V.
(a)
,
PC gamma gain adjustment
1. Receive the 16-step gray scale computer signal 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
±0.03Vdc.
⁄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
Electrical Adjustments
⁄1
Video Y pedestal adjustment
⁄2
Video A/D reference voltage (top
side) adjustment