Sharp AN-S422E, Service Manual

Page: 29 / 178

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XG-V10WE
AN-SD1E/S422E
No. Adjusting point Adjusting conditions Adjusting procedure
8 RGB white
balance adjust-
ment 1. Feed the 32-step grayscale
signal. (SXGA, 60 Hz)
2. Select the following group
and subjects.
Group : OUTPUT1
Subject : R1-BLK (R)
B1-BLK (B)
»
Adjust the R1-BLK and B1-BLK settings to get the
tone balance to optimum.
9 Video horizontal
center adjust-
ment
DLY checking 1. Feed the NTSC
monoscope pattern signal.
2. Group : VIDEO 2
Subject : N358-DLY (2)
N443-DLY (0)
PAL-DLY (0)
SECAM-DLY (0)
Make sure the settings are
as above.
3. Then select the following
group and subject.
Group : VIDEO1
Subject : NTSC-H
»
Using the set's control switch or the remote con-
troller’s button, adjust the setting so that the
overscan be the same at right and left.
10 Video picture
adjustment 1. Feed the split colour bar
signal.
2. Select the following group
and subject.
Group : VIDEO1
Subject : PICTURE
3. Connect the oscilloscope
between pin (1) of P801
and GND.
»
Using the set’s control switch or the remote con-
troller’s button, adjust the setting so that the ampli-
tude between the black and 100% white levels be
2.3 ± 0.02 Vp-p.
11 Video offset
adjustment 1. Feed the colour bar signal
with base band. (ON-AIR
not allowed because of its
too much noise.)
2. Select the following group
and subjects.
Group : VIDEO2
Subject : VROS (R)
VGOS (G)
VBOS (B)
Make sure there are some
bit dropouts on the screen.
If not, press the set’s con-
trol switch or the remote
controller’s mute button.
(Gamma correction is now
set for the adjustment proc-
ess.)
»
Using the set's control switch or the remote con-
troller’s button, adjust the settings so that the black
signal has some bit dropouts.
2.3Vp-p