Ricoh FT3320 Service Training Manual page 78

1 Non. '87
OTHER MECHANICAL AND ELECTRICAL
COMPONENTS
GENERATOR
The CPU controls the timing of all machine operations based on how
it receives from the pulse generator.
pulses
rotation of a notched disk within a photointerrupter. As
from the LED activates the phototransistor each time a notch comes be-
tween them. The pulse interval is 6.37 milliseconds.
If during the copy cycle no pulse is received for a 0.7
main CPU will stop the machine and display E6.
Pulses are generated by the
disk rotates, light
the
second interval,
m a n y
the