Read Sharp PG-A20X (serv.man11) Service Manual online
No.
Adjusting point
Adjusting conditions
Adjusting procedure
24
PG-A20X
5
Video Bright-
ness/Contrast
adjustment
ness/Contrast
adjustment
1. Feed an NTSC composite
video 10-step signal (no
setup) with 100% ampli-
tude.
setup) with 100% ampli-
tude.
2. Select the following group
and subjects.
Group : VIDEO
Subject : Bright
Group : VIDEO
Subject : Bright
Contrast
(Process GAMMA interlock)
1. Check the setting value.
Contrast (White Level): 0
Bright (Black Level):
Bright (Black Level):
13
6
PSIG adjust-
ment
ment
1. Select the following group
and subjects.
Group : OUTPUT2
Subject : PSIG-H
Group : OUTPUT2
Subject : PSIG-H
PSIG-L
2. Check the fixed value.
PSIG-H: 90
PSIG-L: 16
PSIG-L: 16
PSIG
2.5V DC
5.6V DC
GND
1. Feed the XGA signal and adjust to make the follow-
ing PSIG waveform. (TP1101, TP1201 and TP1301)
Adjust with PSIG-L
Adjust with PSIG-H
7
R/G/B Black
Level Signal
Amplitude
adjustment
Level Signal
Amplitude
adjustment
1. Select the following group
and subjects.
Group : OUTPUT1
Subject :
On Green adjustment
Group : OUTPUT1
Subject :
On Green adjustment
G1-BLK
G1-GAIN
G1-GAIN
On Red Adjustment
R1-BLK
R1-GAIN
R1-GAIN
On Blue Adjustment
B1-BLK
B1-GAIN
B1-GAIN
2. Make sure the process ad-
justment color bags appear
onscreen.
onscreen.
3. Connect a oscilloscope to
pin(2) of P1301 for the G
setting.
setting.
4. Connect the oscilloscope to
pin(1) of P1301 and pin(3)
of P1301 for the R and B
settings, respectively.
of P1301 for the R and B
settings, respectively.
White-to-White
Amplitude
1. Select G1-GAIN. Using the set's control switch or
the remote controller's button, adjust the signal am-
plitude to 4.05 Vp-p ± 0.05 V.
plitude to 4.05 Vp-p ± 0.05 V.
2. Now select G1-BLK. Using the set's control switch
or the remote controller's button, adjust the white-
to-white level to 1.70 Vp-p ± 0.05 V.
to-white level to 1.70 Vp-p ± 0.05 V.
3. Do the same for the R and B settings.
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