Ricoh A251 Operating Instructions Manual page 20

If copying to natural tracing paper (all pulp, translucent paper) at a relative humidity of 35% or
less.
a) If the paper was left out of its package for 5 minutes or more, remove the first 700mm (28")
before copying.
b) If copies come out wavy or with white spots, use vellum tracing paper instead of natural
tracing paper.
c) Always keep the paper in a bag when not using it.
Store the paper in a sealed polyvinyl bag if not used for a long period.
If it gets humid, paper will curl or wave causing a paper jam or part of the image not to be copied.
When you use paper in high humidity under hot conditions, take out only the necessary amount
of paper at a time from the bag. Do not take all the paper out of the bag.
Dehumidifing Heater
Under humid conditions, the copier turns on the dehumidifying heater. It is turned on automati-
cally even when the main switch is off. Do not unplug the power.
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