Ricoh FW830, Service Manual

Page: 25 / 227

3.2 ORIGINAL FEED
3.2.1 Basic Operation
When the original is inserted on the original table [A], it activates the original
set sensor [B]. The main motor then turns on. Two seconds later the original
feed clutch turns on to start turning the front original feed rollers [C], rear
original feed rollers [D], and original registration rollers [E]. The two second
delay allows time for the operator to align the lead edge of the original
against the first set of rollers to prevent skew.
The original is fed past the 1st and 2nd original transport sensor [F,G] and
around the rear original feed rollers to the original registration rollers. The
original feed clutch turns off 0.2 second after the original’s leading edge
activates the original registration sensor [H]. The original remains at this
position until a sheet of copy paper is fed.
Just before the copy paper reaches the registration sensor, the original feed
clutch turns on again and original feed resumes. The original passes
between the platen roller [I] and the exposure glass [J] and from there to the
front original feed rollers. The original’s image density is measured by the
ADS [K] at this time. The original’s image is reflected through the fiber optic
array to the drum as it passes between the platen roller and the exposure
glass.
If making a single copy, the original then exits the machine. However, if
making repeat copies, the recycle gate [L] directs the original around the front
original rollers to the upper part of the original transport mechanism. The
original transport cycle then repeats.
The maximum original length for repeat copying is 610 millimeters. If the
operator attempts repeat copying with an original longer than 610 millimeters,
it will automatically feed out after making a single copy.
[A]
[B]
[C]
[F]
[I] [H] [G]
[D]
[E]
[K]
[J]
[L]
EXPOSURE 31 December 1992
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