Section 3 --Operation and Adjustments 3- 5
© 2008, Satake USA Inc.
(ALL RIGHTS RESERVED)
Due to variations in lighting and other factors, these electronic signals from similar
defects may not initially be the same on all channels.
The amplitude of the signals produced by similar defects on various channels can
be made approximately equal by adjusting the gain of all the amplifiers. This gain
adjustment must be made after
the background adjustment.
The gain is adjusted as follows:
A. Connect an oscilloscope trigger input to the yellow START SYNC test point,
TP3, of the Timing PCB (See Figure 2-19).
B. Connect the oscilloscope ground to the white vertical test point, TP5, on the
Amplifier PCB for channels 1 through 10 (See Figure 2-17, 2-18, and 2-20).
C. Connect the vertical input of the oscilloscope to the green test point for the
front view for channels 1 through 10.
D. Turn the machine on, and turn the feed rate down to a low level to convey
product down the chutes.
E. Observe the display on the oscilloscope. It should appear as shown in Figure
2-11.
F. The gain can be adjusted by turning potentiometer R1 on the same Amplifier
PCB. Turning clockwise increases the gain. Turning counter clockwise
decreases the gain.
G. The gain should be set so that the largest dark product produces a negative
signal that is eight volts below the background brightness level.
H. Move the vertical oscilloscope probe to the green test point for the front view
for channels 11 through 20.
I. Adjust the gain as described above, if required.
J. Continue to move the vertical test probe to the next group of channels, and
check and set the gains of all the channels.
K. If the machine is a two view machine, set the gains for the rear views by
connecting the oscilloscope to the green test point on the lower section of
each Amplifier PCB and, if necessary, adjusting potentiometer R27.
L. Observe the EJECTOR LED's on the front of the machine as product is sorted.
The LED's will flash "green" each time an ejector is actuated. If product is
being fed evenly to each channel, then the LED's for all channels should flash
"green" at about the same rate.
If certain channels flash less frequently than most other channels, it may be
necessary to increase the gain for these channels. If certain channels flash
more rapidly than most other channels, the gain of these channels should be
reduced. This method of setting the gains can also be used if an oscilloscope
is not available.
To Next Page
Loading...