Sharp Notevision XG-C50X, Service Manual

Page: 20 / 149

20
XG-C50X
ELECTRICAL ADJUSTMENT
1 Initialization of
EEPROM 1. Turn on the power (the lamp lights
up) and warm up the system for 15
minutes.
No. Adjustment Items Adjustment Conditions Adjustment Procedures
1. Make the following settings.
Press S2601 to enter the process
mode, and execute S2 on the SSS
menu. Now the EEPROM, except for
the PC I/F unit, is initialized.
Do not execute S1, or the PC I/F unit
itself will be initialized.
(The PC I/F unit has been factory-
adjusted.)
To adjust the PC I/F unit, refer to "How
to Adjust the PC I/F unit" on the last
page.
2 Adjustment of
RGB1 black level
signal amplitude 1. Select the following group and sub-
jects.
Group: OUTPUT1
Subject: G1-BLK, G1-GAIN
For the color R, select the subjects
R1-BLK and R1-GAIN.
For the color B, select the subjects
B1-BLK and B1-GAIN.
2. Make sure the process adjustment
color bars are displayed.
3. For the color G, connect a oscillo-
scope to pin (2) of P1301.
4. For the colors R and B, connect the
oscilloscope to pin (1) of P1301 and
pin (3) of P1301, respectively.
1. Select the subject G1-GAIN. Using
the set's control switch or the remote
controller button, adjust the setting
so that the signal amplitude is 4.0
Vp-p±0.05 V.
2. Select the subject G1-BLK. Using the
set's control switch or the remote
controller button, adjust the setting
so that the white-to-white level is 1.8
Vp-p±0.1 V.
3. Do the same for the other colors R
and B.
~
The G1 subjects are linked with the
R1 and B1 subjects.
When the G1-BLK setting has been
changed, therefore, the R1-BLK and
B1-BLK settings vary themselves
accordingly. When the G1-GAIN set-
ting has been changed, equally, the
R1-GAIN and B1-GAIN settings vary
themselves accordingly. First make
the G1 settings and then readjust the
R1 and B1 settings as required.
3 Adjustment of
PSIG 1. Select the following group and sub-
jects.
Group: OUTPUT2
Subject: PSIG-H, PSIG-L
Make sure the PSIG-H and PSIG-
L settings are 64 and 100, respec-
tively.
1. Get the PSIG waveform displayed.
(Feed the XGA signal.)
2.5V DC 5.6V DC
GND
PSIG
Adjust the PSIG-H setting. Adjust the PSIG-L setting.