Electrical Adjustment - Sharp XV-C100U Service Manual

No. Adjustment Item
1 NTSC free-
running
frequency
(R1616)
2
PAL free-
running
frequency
(R1602)
3 Horizontal
center (NTSC)
(DAC)
4 Horizontal
center (PAL)
(DAC)
5 Contrast (DAC)
(gamma
correction off)

ELECTRICAL ADJUSTMENT

Adjustment Conditions
1.Receive the NTSC monoscope pattern
signal.
2.Hold down S801.
1. Receive the PAL monoscope pattern
signal.
2. Hold down S801.
1. Receive the NTSC monoscope pattern
signal.
2. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group: VIDEO 1
Subject: H-CENT
1. Receive the PAL monoscope pattern
signal.
2. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group: VIDEO 1
Subject: P-H-CENT
1. Receive the NTSC 10-step pattern
signal.
2. Connect a dual-beam oscilloscope
between pin (2) of P1401 and GND.
3. Press S2001 to call up the ADJ IN
mode and select the following subject.
Group: VIDEO 2
Subject: SUB-BIAS
4. Using the ' and " keys, put the
waveform to its proper shape.
5. Press S2001 again to call up the ADJ
IN mode and select the following
subject.
Group: VIDEO 1
Subject: SUB-R, SUB-G, SUB-B
Make sure all these subjects have an
entry of 0 (zero).
6. Adjust R861 to get the highest gain.
7. Finally select the following subject.
Group: VIDEO 1
Subject: CONT
19
Adjustment Procedure
• Turn R1616 until the image appears
as specified.
• Turn R1602 until the image appears
as specified.
• Using the ' and " keys, make the
overscan just the same at right and
left.
Overscan: 91-97%
• Using the ' and " keys, make the
overscan just the same at right and
left.
Overscan: 91-97%
• Using the ' and " keys, adjust the
difference between the tenth-step
level and the pedestal level to
6.0±0.15 Vp-p.
XV-C100U
10