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(v) Y [_ and R signal tracking adjustment
Process Board
Adjusts:
Fig. 4-4-37
Match here
■HI
Fig. 4-4-38
I
Fig. 4-4-40
■ ■
IM
Fig. 4-4-39
Fig. 4-4-41
17
here
• Adjust B. TRACKING-1
R206 so that the B signal
matches the Y[_ signal in the lower half of the gray
scale waveform. (Fig. 4-4-37)
•
Adjust Y|_ PED
R218so that the pedestal level of
Y
|_
signal matcnes that of B signal. I
Fig.
4-4-38)
•
Repeat the above steps until the Y[_ and B signal
waveforms match.
•
Adjust B.
TRACKING-2
R204
so
that the B signal
matches the Y j_ signal m the
8th
— 9th
step of
gray
scale
wave
fntm.
(Fig. 4-4-39)
•
Adjust R. TRACK ING- 1
R2O7
so
that the R signal
matches the Y j_ signal
in
the lower half of the gray
scale waveform. (Fig.
4
4-41)
R222 (R. PED)
R207 (R.
TRACKING-1)
R205 (R.
TRACKING-2)
Test points: TP213 (R)
TP214 (Y|_)
R228 (R. GAIN)
Match lower half
7
Match lower
half
•
Keep setting the
lens
iris and connecting the jumper
wire as in the preceding
step.
•
Confirm
that
R
TRACKING-1
R207
and
R.
TRACKING
2
R205
are set to
their
mechanical
center
•
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 the Y
|_
signal on
the
oscilloscope and confirm
that the
signal level between
the
black chip
(zero
step)
and fifth
step
(crossing
step)
of the
gray
scale
waveforms match.
If
not.
adjust R. GAIN
R228 to match them. (Fig.
4 4-40)
innmm
im
S
w
Z
ibv
Match here
iSW
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