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(I) Dynamic focus adjustment
R116 (FOCUS)
Deflection Board
Adjusts:
. SAWTOOTH
R121
G
Observe:
Fig. 4-4-19
Process Board
2.
Fig. 4-4-20
12
BB
NO GOOD
GOOD
• After the above adjustment, trigger the oscilloscope
at
. rate again. (Use TP106 on deflection board)
• Confirm
that the dark current in the middle of
waveform is 50m . If not, readjust TARGET
R1 10
for 50m .
(k) Beam current readjustment
•
Adjust the beam current while referring to (b)
Beam
current
adjustment
on page 7.
(m) Optical black (OB) correction and OB offset adjust
ment
Test point:
Adjusts:
T 203(Y)
R226 (OB
CORRECTION-PARA)
R225 (OB
CORRECTION-SAW)
R227 (OB OFFSET)
H. PARABOLA
. PARABOLA
H. SAWTOOTH
. SAWTOOTH
H. SAWTOOTH
H. PARABOLA
VR118
VR120
R119
R118
R119
R121
R132 (H.
SAWTOOTH)
R131 (H.
PARABOLA)
R133 ( .
PARABOLA)
R134 ( .
SAWTOOTH)
Color monitor
©
•
Keep the lens iris set as in the preceding step.
•
Disconnect the jumper wire between pin 2 of CN208
and TP207on the Process circuit board
•
Cap on the lens after aiming the camera at the white
chart for a while (about 30 seconds) until burning
image on the vidicon disappears.
•
Connect the oscilloscope to TP203.
•
Trigger the oscilloscope at H.rate. (Use TP105 on
deflection board)
•
Adjust OB CORRECTION-PARA
R226 and OB
CORRECTION-SAW
R225
so that the top portion
of
dark
signal waveform becomes as narrow as
possible (Fig
4-4-20)
•
Keep
setting the lens iris and connecting the jumper
wire as in
the preceding step.
•
Aim the camera
at the white chart.
•
Observe the color monitor, and adjust
FOCUS
R116 for minimum green in the center and maxi
mum magenta (red) throughout the picture area.
•
Observe
the
color
monitor and adjust
for
the best
white balance
at the center
of
the
screen
using the
color
adjustment (RED/BLUEI
control
on
the side
of
the camera
•
Increase the color monitor's
chroma gain for better
viewing
Make sure
properly.
•
Adjust DYNAMIC FOCUS,
H SAWTOOTH
R132,
H
PARABOLA
R 131,
.
PAR ABOLA
R 133 and
SAWTOOTH
R134 to minimize the green tint in
the corners
and
edge
of picture.
Note: 1.
Overall focus
is
affected by the dynamic
focus
adjustment
so
readjust
FOCUS
R1 16
occasionally
while performing the
dynamic focus adjustment
The
object
ol this adjustment
is
to opti
mize
overall
focus, especially
at the pic
ture edges and
corners.
that
the color monitor is converged
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