Sensor Input Circuit - Ricoh FT7770 Service Manual

30 April, '89

4. Sensor Input Circuit

The sensor input circuit is basically the same as that of the first sorter.
However, it needs only one LS151 CHIP (IC208) because the second sorter
does not use a manual feed sensor.
The +5 volt power for this circuit
comes from the first sorter.
Input from the sensors and switches go through noise filters (HB201 and
HB202) to eliminate false indications. The output of the noise filters is
then buffered and input as data to a one-of-eight data selector. Timing
signals (3-bit data) coming from the first sorter select which data bit is
output from the one-of-eight data selector. This output is buffered and
sent to the first sorter.
10-5