Ricoh A318 Service Manual page 8

1 May 1993 BASIC OPERATION
2. Two-sided Original Feed
Unlike one-sided original feed, the back side of the original must be copied
first to keep the originals and copies in the correct order.
During original feed-in, the sequence is the same as for one-sided feed;
however, the DF CPU also energizes the inverter motor and the inverter
solenoid a short time after the original trailing edge has passed the DF
registration sensor. The belt drive motor continues to feed the original until
the original leading edge passes the feed-out sensor. At this point the inverter
mechanism inverts the original, in preparation for copying the back side.
Then the belt drive motor reverses and the original is fed towards the left
scale and is aligned against the scale. The DF CPU sends the copy start
signal a short time after the original trailing edge has passed the feed-out
sensor.
When the scanner reaches the return position, the copier CPU sends the
invert original signal to the DF CPU in order to make a copy of the front side.
The original is inverted in the same way as for back side copying.
3. Semi-automatic Document Feed
If a single original is inserted into the original table and copied, the DF shifts
to the semi-automatic feed mode and lights the Auto Feed indicator. The
Auto Feed indicator remains on for five seconds after the copier main motor
stops. If another original is inserted within that five-second period, it is
automatically fed and copied.
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