Electrical Adjustment - Sharp XG-C58X Serviceanleitung

XG-C58X
XG-C68X
No. Adjustment Items
1 Initialization of
EEPROM
2 Adjustment of
RGB1 black level
signal amplitude
3 Adjustment of
PSIG
4 Checking of
sample-and-hold
pulse phase

ELECTRICAL ADJUSTMENT

Adjustment Conditions
1. Turn on the power (the lamp lights
up) and warm up the system for 15
minutes.
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 following group and sub-
jects.
Group: OUTPUT2
Subject: PSIG-H, PSIG-L
Make sure the PSIG-H and PSIG-
L settings are 225 and 120, respec-
tively.
1. Feed the XGA-mode 75-Hz black
signal.
2. Select the following group and sub-
ject.
Group: OUTPUT3
Subject: ENBXR-PH
ENBXG-PH
ENBXB-PH
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
page30.
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 4.2
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 1.4
Vp-p±0.1 V.
3. Do the same for the other colors R
and B.
1.4Vp-p
1. Below is the waveform of PSIG.
(TP1301-2P)
1. Check the blurring of the letters of
OUTPUT 3 and the ghost.
2. Raise the value of the ENBXR-PH
until the front ghost appears on the
left side of the letters of OSD.
3. When the value is lowered for 1 - 2
points, the front ghost disappears.
Set it to the value for 2 lowered from
the value when the front ghost
disappears.(In case that the front
ghost appears when the value of the
EMBXR-PH is 11 and disappears
when it is 10, set it to 8.)
4. Adjust the green and blue in the same
manner.
24
4.2Vp-p
PSIG-H
PSIG-L
GND