Feed-In Sensor - Ricoh FT7770 Service Manual

2. Feed-in Sensor

When an original is inserted, the feed-in sensor (a photointerrupter) is ac-
tivated and a LOW signal is applied to CN105-A12 on the DF main board.
The DF main board then stops sending pulse signals to CN105-A7, thus turn-
ing off the Insert Original indicator.
main board, via the fiber optics, to inform the copier CPU that an original
is set on the DF.
Its also sends a signal to the copier
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April, '89