Ricoh Priport JP5000 Operating Instructions Manual page 34

OPERATION
Important
Correct curls in the paper before setting it in the machine. When you cannot
correct the paper curl, stack the paper with the curl face down. If paper is
curled, it might wrap around the drum or stains might appear.
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Do not store paper where it will be exposed to heat or direct sunlight.
Store on a flat surface.
Store paper where it will not curl or absorb moisture. Use paper soon after it is
unpacked.
Only use paper where the leading edge has two right angle corners.
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