Sharp VB-500/A/BG Service Manual page 11

CCD Adjustment
Adjustment
Pattern
Adjustment Procedures
VB-500/A/B&
© Adjustment of Rotational Direction
Short-circuit R223 and R226.
Make the adjustment by turning
the hexagon nut ®) of Figure 9 so
that the marks in pattern © all
appear.
Fix the nuts ©) and © after adjust-
ment.
©
[_____] Angle adjustment
Turn to adjust
Tighten the screws.
(5 ~ 6 kg. cm)
Lens holder
Oscilloscope Range
0.5msec 2V/div
© Adjustment of Waveform Keep
open R223 and R226.
eAfter turning on the power
switch, Let the unit Warm up for
at Least 10 minutes.
eClose the rear cover at fluores-
cent lamp side.
Move the light volume adjustment
plate so that the output waveform
of TP3 becomes flat within the
reference pulse range (at TP1).
Fix the light volume adjustment
plate after adjustment.
, Reference pulse for
| read-out range
|
i
Make adjustment so that the
waveform becomes flat within
the reference pulse range.
Fix the light volume adjustment
plate after adjustment.
Oscilloscope Range
0.5msec 2V/div
i ae Light volume
adjustment plate
@ Gain Adjustment
Keep open R223 and R226
Make the adjustment at the rear
cover of fluorescent lamp side and
in a darkroom.
eAfter turning on the power
switch, Let the unit warm up for
at Least 10 minutes prior to
adjustment.
Adjust R220 on the CCD
PWB to obtain the output
of 6V+05V.
Oscilloscope Range
0.5msec 1V/div
Screw Locking
Apply screw-lock
to the screws.
Apply screw-lock to
the screw, hexagon
nut and lens holder.
Apply screw-lock
to the screw.
Apply screw-lock
to the lens fixing
Apply screw-lock to Screw
the screw,hexagon
nut and PWB.
Apply screw-lock
to the screws.
Apply screw-lock
to the screw.
11