Ricoh A251 Operating Instructions Manual page 142

Creases
Try setting your copy paper sideways.
If long runny creases appear on copies, try setting your copy paper sideways, or try changing the
copy media setting.
If creases appear on copies made to transparent film, try setting your film sheets sideways.
Copies come out dog eared
Try setting your copy paper with the other side facing up.
Make sure your copy paper is undamaged.
Black streaks appear on copies
Check that the exposure glass is clean.
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