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31 December 1992
11. OTHERS
11.1 PULSE GENERATOR
The CPU controls the timing of all machine operations based on the number
of pulses it receives from the pulse generator. Pulses are generated by
rotating a disk with slots in it within a photointerruptor. As the disk rotates,
light from the LED activates the phototransistor each time a notch comes
between them. The pulse interval is 3.125 milliseconds.
If no pulses are received for one second during the copy cycle, the machine
will stop and display "Eb" in the copy counter.
[S4]
2-47
Main Board [PCB1]
+5V
CN112-1
CN112-3
CN112-2
OTHERS
CPU
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