Registration - Ricoh FT5540 Service Manual

31 August 1989

8. REGISTRATION

NOTE: In the following discussion, ADF timing is in parentheses.
The DF CPU stops the feed-in motor 25 milliseconds after the leading edge of the original
activates the original entrance sensor [A]. The forward momentum of the original causes it to
align against the registration roller [B] (skew correction).
After a further 30 milliseconds, the DF CPU energizes the belt drive motor [C] and the
registration solenoid [D]. Rotation of the belt drive motor is transmitted via the timing belts
[E and F], belt drive gear [G], registration clutch [H], and registration roller gear.
The DF CPU starts counting the belt motor pulses when the leading edge of the original
activates the registration sensor [I]. When the pulse count reaches 1,844 pulses, the original is
at the proper position. The DF CPU then stops the belt drive motor.
In Auto P.S. or Auto R/E mode the ADF automatically determines the original size. The original
size is measured by a combination of the original width sensor [J] and the registration sensor.
The registration sensor measures the length of the original by counting pulses as the original
passes under it.
The registration sensor is also a jam detector.
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