Ricoh FT5540 Service Manual page 404

The mark detection sensor [A] detects the reference line [D] and reads the job sheet. The
mark detection sensor is composed of 4 photosensors. The sensor on the right [B] detects
the reference line 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. There are 25 reference marks along the sheet edge. After
the 25th reference mark is read, the job 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.
12-5
31 August 1989