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SECTION
7
ELECTRICAL
ADJUSTMENTS
7-1, Confirmation
of the
input
signal
For
electrical
adjustment,
the
video
signal
obtained
from
the pattern
generator
is used as the adjustment
signal.
Therefore, it is necessary
that this video output signal
is within
the standard.
1)
When
inputting
an
S video
signal
Connect
the oscilloscope
to the
Y signal
terminal
of the S video input terminals
(terminal
plate) and
confirm
that
the amplitude
of the SYNC
signal of
the Y signal is approximately
0.38Vp-p and that that
of
the
video
section
is approximately
0.7Vp-p.
(Furthermore,
when
using
the
VTR
with
the
S video
output
terminals, confirm
that
the chroma
signal
and
the
burst
signal
do
not
remain.)
Also,
connect
the
oscilloscope
to
the
chroma
signal
terminal
of the S video input terminals
and confirm
that the burst signal amplitude of the chroma
signal
is approximately
0.3Vp-p and flat, and that the level
ratio
of the
burst
signal
and
the
chroma
signal
is 0.30: 0.66,
The
Y
signal
and
the
chroma
signal
to be used
for
adjustment
are
shown
in Fig. 7-1.
Y
signal
Approx, 0.7V
Approx, 0,3V
Horizontal
SYNC
signal
Chroma
signa
Chroma
Burst
amplitud
amplitude
Burst
signal
(Should
be flat)
Burst
amplitude : Chroma
amplitude=0.30 : 0.66
' Fig. 7-1, Colour
bar signal of pattern
generator
[Setup
for adjustment]
For the electrical
adjustment, the video
signal obtained
from
the
PAL
pattern
generator
is
used
as
the
adjustment
signal. Therefore,
it is necessary
that
this
video
output
signal
should
be
within
the
standard.
Connect
the
oscilloscope
to the
video
input
terminal
and
confirm
that
the
amplitude
of the
SYNC
signal
of the
video
signal
is approx.
0.3V
and
that
of the
video
section
is approx.
0.7V.
Also
confirm
that
the
burst
signal
amplitude
is approx.
0.3V
and
flat, and
that the level ratio of the burst signal and the
"red"
signal
is 0.30 : 0.66.
The
video
signal
(colour
bar
signal)
to be
used
for
adjustment
is shown
in Fig. 7-2.
Adjust
to
these
levels
White (Approx.100%)
fq Signals
excluding
the
Y signal
Approx, 0,7V
Burst Signal
Horizontal
SYNC, signal
(Should
be Flat)
Fig. 7-2. Colour
bar
signal
of pattern
generator
7-1-1, Adjustment
of YC separation
level (CY-5 Board)
24,(4],
Monit
Measurement
point
[4], [6] and
Monitor in
output
Measurement
equipment
Oscilloscope
RV500,
RV501,
j
|
Adjustment
elemant
RV502,
RV503
Adjust
the white
level of
the COMPOSITE
signal
and
the Y signal
Specified
value
(adjusting
method)
1)
Input
the
colour
bar
signal
to
and
adjust
the
output waveform
of [2],
2)
Input
the
colour
bar
signal
to
and
adjust
the
output
waveform
of [4].
Input
the
colour
bar
signal
to
and
adjust
the
output waveform
of [6].
3)
Turn
off the V-S
switch.
(by pushing
the CLEAR
button.)
4) Switch
MONITOR
over
to the
output of [5]
(INPUT
"OUTPUT
selector
SW)
and
adjust
the
waveform
of the output
of MONITOR
[1].
=
i022
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