Pulse Generator - Ricoh M5 Service Manual

2. Pulse Generator

The copier's CPU controls the timing of all machine operations based on how many pulses it has
received from the pulse generator.
photocoupler.
As the disk rotates, light from the LED activates the phototransistor each time a hole
comes between them.
— Service Call Condition –
The CPU monitors the pulse generator to detect malfunctions in the functional drive. If during the
copy cycle, no pulse is received for one second, the CPU stops the machine and lights self-diagnostic
code E6.
Timing Belt
Pulses are generated by the rotation of a perforated disk within a
The the CPU at 11.1 ms intervals.
pulses arrive at
3 - 7 6
May, 25, 1985