Sharp XG-C58X Service Manual page 25

No. Adjustment Items
5 Adjustment of
RGB counter-
voltage
6 Adjustment of
RGB gradation
reproduction
7 Adjustment of
RGB white bal-
ance
8 Adjustment of
video AGC
9 Adjustment of
video brightness/
contrast
10 Adjustment of
video tint
Adjustment Conditions
1. Feed the counter-voltage adjust-
ment signal (XGA) prepared by the
Technical Department.
2. Select the following group and sub-
jects.
Group: OUTPUT3
Subject: RC (R), GC (G), BC (B)
1. Feed the SMPTE pattern signal
(XGA) .
2. Select the following group and sub-
ject.
Group: OUTPUT1
Subject: G1-BLK
1. Feed the 32-step gray scale signal
(XGA, 60 Hz).
2. Select the following group and sub-
jects.
Group: OUTPUT1
Subjects: R1-BLK (R), B1-BLK (B)
1. Feed the NTSC 10-step gray scale
signal(with burst).
2. Select the following group and sub-
ject.
Group: VIDEO
Subject: AGC-ADJ
3. Connect the oscilloscope between
TP4501 and TP4502
1. Feed the NTSC100% window pat-
tern signal(with burst).
2. Select the following group and sub-
jects.
Group: VIDEO
Subject: AUTO, PICTURE/BRIGHT
1. Feed the split color bar signal.
2. Select the following group and sub-
ject.
Group: VIDEO1
Subject: TINT
Adjustment Procedures
1. Using the set's control switch or the
remote controller button, adjust the
settings to minimize flickers.
2. If the results are inconsistent at the
center and on both sides onscreen,
readjust the settings to get the same
results on both sides.
1. Confirm that the 100% and 95% white
gradation as well as the 0% and 5%
black gradation are discernible.
2. If the white gradation looks differently,
finely adjust the G1-BLK setting.
1. Adjust the R1-BLK and B1-BLK set-
tings to have the specified gradation
balance (according to the standard
monitor).
1. Using the set's control switch or the
remote controller button, adjust the
setting so that the white-to-black level
is 0.72 Vp-p±0.01 V.
1. Feed the signal. Using the set's con-
trol switch or the remote controller
button, select the subject AUTO. The
setting will adjust itself.
2. And then lower the adjustment value
of the PICTURE/BRIGHT by 2 points.
3. Then adjust the PICTURE/BRIGHT
setting until the signal becomes bit-
less.
1. Confirm the fixed value.
Fixed value: 128
25
XG-C58X
XG-C68X