BOXLIGHT MP-45, Руководство по обслуживанию

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Circuit Adjustments
CAUTION: The each circuit has been made by the fine adjustment at factory. Do not attempt to adjust the follow-
ing adjustments except requiring the readjustments in servicing otherwise it may cause loss of per-
formance and product safety.
Electrical Adjustments
[Adjustment Condition]
●
Input signal
Video signal .......................... 1.0Vp-p/75 Ω terminated, 16 steps gray
scale, white 100% and black 0% pat-
tern (Composite video signal)
Computer signal .................... 0.7Vp-p/75 Ω terminated, 16 steps gray
scale pattern (XGA)
Component Video signal........ 0.7Vp-p/75 Ω terminated, 16 steps gray
scale, white 100% and black 0% pat-
tern (480i format)
RGB Video signal .................. 0.7Vp-p/75 Ω terminated, 16 steps gray
scale, white 100% and black 0% pat-
tern (480p format)
●
Picture control mode ................ “STANDARD” mode unless otherwise noted.
Note:
* Please refer to “Service Adjustment Menu Operation” for entering to the service mode and adjusting the service
data.
White 100%
Black 100%
After replacing the Power Board readjust the Output
voltage adjustment as follows.
1. Connect a digital voltmeter to pin 1 (+) of
K6A
and
chassis ground (-).
2. Adjust the voltage by using
VR601
on the power
board as following.
AC Input Reading
230V 370 ±2Vdc
or 120V 356 ±2Vdc
Caution:
Be sure to connect the lamp when taking this adjust-
ment.
z
Output Voltage adjustment
1. Receive the 16-step gray scale video signal with
Input 3 [VIDEO] mode.
2. Connect a digital voltmeter to pin 3 (+) of
CN6A
and
chassis ground (-).
3. Adjust the voltage to be
15.8
±0.1Vdc by using
VR681
on the power board.
x
+16V adjustment
16 steps gray scale pattern
1. Enter the service mode.
2. Connect a digital multimeter to test point “
TPFN
❊
” (+)
and chassis ground (-). (as shown below)
3. Select group no. “
11
”, item no. “
24
” and change data
value of the fan number. (as shown below)
4. Select item no.“
41
” and change data value to adjust
the fan max. output voltage to be
14.0
±0.1V.
5. Select item no.“
42
” and change data value to adjust
the fan min. output voltage to be
6.5
±0.1V.
6. Each fan should be adjusted refer to item 2 - 5.
Note:
The location of each fan is refer to the parts list.
c
Fan Voltage adjustment
FAN No. Group/Item
FN901 11 / 24
FN902 11 / 24
FN903 11 / 24
FN904 11 / 24
FN905 11 / 24
FN906 11 / 24
FN907 11 / 24
Data Test point
0 TPFN1
0 TPFN1
2 TPFN3
5 TPFN4
1 TPFN5
4 TPFN6
3 TPFN7
Note:
The Power Board for replacing is already adjusted in
the factory, so it is not required to perform readjust-
ment of item1 and 2.