Feed Pressure Adjustment For Paper Size - Ricoh Aficio MP2550B Service Manual

6.11.10

FEED PRESSURE ADJUSTMENT FOR PAPER SIZE

To ensure effective paper separation at the friction pad, the stack lift motor and bottom
plate must maintain the correct, constant pressure of the top on the stack on the feed roller
above.
If the pressure is too high, this can cause double-feeding.
If the pressure is too low, paper feed failure.
To prevent these problems, the machine takes into account the size of the paper in the tray
and constantly monitors the amount of paper remaining in the tray. It uses this information
to make slight adjustments by raising or lowering the bottom plate with the stack lift motor
to maintain the correct pressure against the feed roller.
Several SP codes can be used to adjust feed pressure based on these variables:
Paper size. The paper size detectors tell the machine the paper size loaded in the tray.
Amount of paper remaining in the tray. The paper height sensors monitor the
amount of paper remaining in the tray.
The pressure of the spring under the friction pad does not change and cannot be adjusted.
However, downward pressure from weight of the stack on the bottom plate varies
according to paper size and orientation (LEF or SEF). A stack of A3 size paper, for example,
will weigh much more than a stack of A5.)
SM 6-63
Paper Feed
D017/D018/D019/D020