Sharp XV-ZW99U Service Manual page 23

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xv-zw99u
ELECTRICAL ADJUSTMENT
NOTE :
The settings have been factory-adjusted to their best points. If any of them gets out of spec or after any
relevant part has been replaced, make the related adjustment.
NO. Adjustment Position Adjustment Conditions Adjustment Method
1
Video Contrast
1. Receive the NTSC 1 O-step pattern signal.
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Using the A and v keys, adjust the
WC)
2. Connect a oscilloscope between pin (2)
difference between the tenth-step
of P3004 and GND.
level and the pedestal level to
3. Press S2001 to call up the ADJ IN mode
1.7*0.05 vp-p.
and select the following subject.
10
-;c--
Group: VIDEO 1
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Subject: CONT
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' 1.7
VP-F
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+
2 Video
AGC
1. Receive the NTSC 1 O-step pattern signal.
l
Using the A and v keys, adjust the
WC)
2. Connect the oscilloscope between pin (2)
difference between the tenth-step
of P3004 and GND.
level and the pedestal level to
3. Press S2001 to call up the ADJ IN mode
0.9*0.05 vp-p.
and select the following subject.
10
Group: VIDEO 1 - ;c- -
Subject: AGCADJ
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) 0.9 vp-p
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3
Video
Brightness
WC)
1. Receive the NTSC 1 O-step pattern signal.
l
Using the A and v keys, adjust the
2.
Connect the oscilloscope between pin (2)
data so that the pedestal level signal
of P3004 and GND.
becomes green bit-less (noise).
3. Press S2001 to call up the ADJ IN mode
and select the following subject.
10
Group: VIDEO 1
Subject: BRIGHT
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