Ricoh FT5233 Service Manual page 672

ORIGINAL FEED
6.5 ORIGINAL SELECT SWITCH
This document feeder has two different ways of stopping original 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].
1. Thin Original Mode
The original is stopped at the correct position on the exposure glass based
on encoder pulse count. For the first side of the original, the belt drive motor
stops 238 encoder pulses after the original's trailing edge passes the
registration sensor in the one-sided original mode. For the reverse side of the
original, the belt drive motor reverses its rotation 85 m sec after the leading
edge passes the feed-out sensor. It stops after 2805 pulses. (Exact timing
depends on registration adjustment.) Thin original mode is selected at the
factory.
2. Thick Original Mode
When the thick original mode is selected, the original is aligned against the
original scale. For the first side, the belt drive motor stays on 36 encoder
pulses longer than when in the thin original mode, and then reverses for 62
encoder pulses. This forces the original against the original scale and thus
aligns the edge of the original with the original scale.
For the reverse side, the belt drive motor continues to reverse for 62 encoder
pulses longer than when in the thin original mode.
NOTE: The thick original mode should be used when the customer
requires more correct leading edge registration adjustment or
when these are complaints of skewed copies. The thin original
mode is to prevent the thin original's from being bent since they
do not have great stiffness.
[A]
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12 February 1992