Pitney Bowes W985 User Manual page 27

Stacker Adjustments
Very short, thick-on-the top pieces may fall over backwards (such as small envelopes with the
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flap on top) before it hits the sensor when accumulating on the stacker. In these cases, move
the full stack sensor closer to the end of the stacker (towards the "11" end on the horizontal
scale).
For extremely thick pieces, you may need to move the stack sensor up in height (vertically) to
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allow for maximum capacity (towards the "0" end on the vertical scale).
Theory
These adjustments are made so that the "stack full" indicator switch functions correctly while allowing
the maximum number of mail pieces to be stacked.
Pitney Bowes User Guide September 2021 27