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B-500/A/BG
3.
CCD Adjustment
Adjustment
Pattern
Adjustment Procedures
@ Preliminary Adjustment
Turn
on
dip switch
1 and
the
power switch.
Check
the output
waveforms
of
TP1 and TP3 with an oscilloscope.
Oscilloscope Range
0.5msec 2V/div
®
Make
a preliminary adjustment of the lens focus, so that the
CCD output can be obtained which corresponds
nearly to the
reference pulse width within the read-out range.
Set the gain control
at Min
position.
Keep the light volume
adjustment plate in the open state. Fix each screw lightly.
Short-circuit R223 and R226 of CCD PWB. Keep the optic axis at
lower than the saturation point (to ensure no variation).
@ Adjustment
of Lens
(Focus
Dis-
tance) short-circuit R223 and R226
Make the adjustment so that the checkers of the white sheet or
the marking will become deepest against the level of white. Fix
the lens by tightening the screws.
Oscilloscope Range 0.5msec 2V/div
® Adjustment of Read-Out Range
Short-circuit R223 and R226.
Adjust the left edge of the TP1
pulse to the marking 25 mm
dis-
tant from the bottom
end of the
white
sheet by turning the hex-
agon
nut @ of Figure 9. Then fix
the nuts @ and @.
TP1
Reference pulse
-out
{
of sheet
]
1
1
TP3 1
« Signal
25 mm mark
Make adjustment by turning
the hexagon nut of CCD PWB,
and fi
j
Haadcubeanga
ix after adjustment.
Osilloscope Range 0.2msec 2V/div
@ Adjustment of Optic Axis
(Angle Adjustment)
Short-circuit R223 and R226.
Turn the screw © of Figure 9 until
the mark in the center of pattern ©
comes
down
to the
lowest
posi-
tion.
When
viewed
from the lens
side, the read-out position is 8 mm
closer to the board from the area
brightened by reflection of fluores-
cent lamp.
SS
Reference pulse
Area with reflection
of fluorescent lamp
Make adjustment by turning the
angle adjustment screw so that
the mark in the middle comes to
the center of waveform (read-out
reference pulse).
8mm
Adjustment position
Osilloscope Range
0.5msec 2V/div
10
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