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Fig. 4-4-31
Fig. 4-4-29
(t > Signal shading adjustment
(s) R gain and R pedestal preset adjustment
Process Board
Process Board
Adjusts:
Adjusts:
R222 (R. PED)
1
Match here.
Fig. 4-4-30
15
•
Repeat adjusting
R216
and
R218 until the signal
level between the black chip (zero step) and fifth step
(crossing step), and
pedestal
level of gray scale
waveforms match.
•
Next, adjust R PED
R222so that the pedestal level
of R signal matches that
of
Yj_
signal.
(Fig. 4-4-31)
•
Keep setting the lens
iris
and connecting the jumper
wire as in the preceding step.
•
Aim the
camera
at the
white chart.
• Next, adjust Y|_ PED
R218 so that the pedestal
level of Y|_ signal matches that of B signal. (Fig.
4-4-29)
Test points:
TP213(R)
TP214 (Y L )
R228 (R. GAIN)
■
R signal shading adjustment
•
Connect
the
oscilloscope to
TP214
(Yj_) (chi) and
TP21 3
(
R)
(ch2).
•
Trigger the oscilloscope
at H
rate. (Use TP105 on
deflection
board)
•
Invert ch2 (R, TP213)
on
the
oscilloscope.
•
Set
the
oscilloscope to
ADD
inode
and
observe the
Y L -R signal thus produced.
•
Adjust R-H. SAWTOOTH
R213 and R-H. PARA
BOLA
R215 to make the waveform as flat as pos
sible. (Fig. 4-4-32)
Test points: TP213 (R)
TP212 (B)
TP214 (Y L )
R209 (R- .
SAWTOOTH)
R211 (R- .
PARABOLA)
R213(R-H.
SAWTOOTH)
R215 (R-H.
PARABOLA)
R208 (B- .
SAWTOOTH)
R210(B- .
PARABOLA)
R212 (B-H.
SAWTOOTH)
R214 (B H.
PARABOLA)
•
Keep setting the
lens iris and
connecting
the jumper
wire as in the
preceding step.
•
Aim
the camera at the
logarithmic gray scale
chart.
•
Connect
the
oscilloscope
to TP213
(R)
and
TP214
(Y
l
).
•
Trigger
the
oscilloscope
at
H.rate.
(Use
TP105
on
deflection
board)
•
Overlay the
R
signal and
Yj_
signal on
the
oscil
loscope, and adjust R.GAIN
R228
so
that the signal
level between the black chip
(zero step)
and fifth
step (crossing step) of the gray
scale
waveform
match. (Fig. 4-4-30)
Note:
Before adjusting
R228,
if the gray
scale ' s
black chip of R Signal
is
suppressed, turn
R.PED
R222
until the black ' hip
of
R signal
can
be
observed.
•
Repeat adjusting
R228 and
R222 until the signal
level
between
the black chip
(zero step)
and fifth step
(crossing
step),
and
pedestal
level
of
gray
scale
waveforms match.
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