Ricoh FT7770 Service Manual page 512

The mark detection sensor [A] detects the reference line [D] and reads
The mark detection sensor is composed of 4
the job sheet.
The sensor on the right [B] detects the reference line
photosensors.
and reference marks [E], and the other sensors [C] read the job sheet data.
The menu reader CPU monitors signals from the mark detection sensor and
measures the time between each reference mark.
marks along the sheet edge.
sheet is fed out by the upper and lower transport rollers [F, G].
The operation panel status changes after the job sheet is read, and the
job sheet information is sent to the copier CPU.
After the 25th reference mark is read, the job
12-5
There are 25 reference
30 April, '89