Sharp XG-XVI E/A Manual de serviço - Página 21
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Hook up a signal generator, or a DOSV or Mac personal computer to the projector in order to feed the
signals specified in the Adjusting conditions.
Note : All the adjusted data will be cleared by making the " FACTORY SETTING 1" or " FACTORY SETTING 2" .
Before using the previous data for adjustment, write down the modified data on a notepad or the like and
then make the initialsettings.
Adjusting point
No.
1
EEPROM in
initialization
(Note)
2 PC board
brightness
adjustment
3
PC board AD
converter
reference
voltage
adjustment
4
PC board drive
adjustment
ELECTRICAL ADJUSTMENT
Adjusting conditions
1. Turn on the power (make
sure the lamp lights up) and
warm up the unit for 15 min-
1. Feed the XGA black signal.
2. Connect the oscilloscope to
3. Make the following choice:,
Group
OUTPUT2
Subject : BRIGHT
4. Press the sound mute key'
to cancel the colour bar test
pattern that is automatically
outputted.
Subject : ROS,
GOS,
1. Group : A/D
Subject : Set GAIN
value at 163.
2. Feed the XGA and gray scale
signal.
3. Connect the oscilloscope to
4. Make the following choice:
Group : A/D
Subject : R-D
Adjusting procedure
Make the following settings:
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Press S5001 to call up the process mode and ex-
PC board not included, is initialized. In order to make
the PC board adjustments (Nos. 2, 3 and 4), execute
not execute Sl .
points to then adjusted value.
Adjust the positive-pole voltage of C64 to 1.7 V DC.
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Similarly, adjust the positive-pole voltages of C57 and
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Make adjustment so that the white peak level of the
l
signal becomes 3.6 V DC. At this time, make sure
that the waveform is not deformed at both the black
side and white side.
Similarly, make adjustment for TP2 and TP3 in the
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subjects G-D and f B-D, respectively.