Service manual
ELECTRICAL ADJUSTMENT
-
2 PC board
1. Feed the XGA black signal.
@
Adjust the signal’s black level to 1.7
V
DC and add 10
brightness
2. Connect the oscilloscope to
points to then adjusted value.
adjustment
TP2.
3. Make the following choice:,
Group
:
OUTPUT2
;
Subject
:
BRIGHT
-
3
PC board AD
1.
Group
:
A/D
l
Adjust the positive-pole voltage of C64 to 1.7
V
DC.
converter
Subject
:
ROS,
l
Similarly, adjust the positive-pole voltages of C57 and
reference
GOS,
C50
in the subjects
GOS
and BOS, respectively.
voltage
BOS.
adjustment
-
4
PC board drive
1. Group
:
A/D
l
Make adjustment so that the white peak level of the
adjustment
Subject
:
Set GAIN
signal becomes 3.6
V
DC. At this time, make sure
value at 163.
that the waveform is not deformed at both the black
2.
Feed the XGA and gray scale
side and white side.
signal.
l
Similarly, make adjustment for TP2 and TP3 in the
3. Connect the oscilloscope to
subjects G-D and
f
B-D, respectively.
TPl.
4. Make the following choice:
Group
:
A/D
Subject
:
R-D
XG-XVI
E/A
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.
No.
Adjusting point
Adjusting conditions Adjusting procedure
1
EEPROM in
1. Turn on the power (make
l
Make the following settings:
initialization
sure the lamp lights up) and
Press
S5001
to call up the process mode and ex-
(Note)
warm up the unit for
15
min-
ecute
S2
in the
SSS
menu. Now the system, with the
utes.
PC board not included, is initialized. In order to make
the PC board adjustments (Nos. 2, 3 and
4),
execute
Sl.
If not making those PC board adjustments, do
not execute
Sl
.
4. Press the sound mute key’
to cancel the
colour
bar test
pattern that is automatically
outputted.
21