Ricoh FT4215, Service Training Manual

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This document feeder has two different ways of stopping originals at the
correct position on the exposure glass. They are called the "thin original
mode" and the "thick original mode". The mode used is determined by the
original select switch [A].
– Original Select Switch –
1. Thin Original Mode
The original is stopped at the correct position on the exposure glass based
on encoder pulse count. The belt drive motor stops shortly after the original
trailing edge passes the DF registration sensor. (Exact timing depends on
registration adjustment.) Thin original mode is selected at the factory.
2. Thick Original Mode
When thick original mode is selected, the belt drive motor remains energized
for an additional 30 encoder pulses as compared to thin original mode. Then,
the belt drive motor pauses and reverses for 21 pulses. This forces the
original against the left scale and thus aligns the edge of the original with the
scale.
After the exposure cycle is completed, the copier sends the feed-out signal to
the DF CPU and the belt drive and feed out motors start turning. At this time,
the copied original feeds out and the next original feeds in.
[A]
STM 3-13 FT4220/4222