Ricoh A151 Field Service Manual page 350

ORIGINAL FEED
7.6 ORIGINAL FEED AND MISFEED DETECTION TIMING
The above chart shows the original feed timing for A4 lengthwise or 8.5" x
11" originals, and the misfeed detection timing.
The registration sensor is used for misfeed detection. If the DF CPU detects
a misfeed, the DF CPU lights the Original Misfeed indicator and sends the
original misfeed signal to the copier CPU. Then the copier CPU lights the
Check Paper Path and Misfeed Location (J0) indicators on the operation
panel.
When the main switch is turned on, the DF CPU checks the registration
sensor output for initial original misfeed.
During original feed-in, the DF CPU performs two types of original misfeed
detection:
1. Whether the registration sensor is actuated within 500 milliseconds after
the pick-up solenoid and the feed clutch turn on.
2. Whether the original has passed through the registration sensor 1,500
milliseconds after the registration sensor has been actuated.
A202/A203 9-12
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