Causes Symptoms Countermeasure
Printing paper not
suitable
If paper is too thick, it won't be likely fed. If too thin,
double sheets may be fed.
Paper not clearly cut: 2 sheets still adhere to other.
Much paper scraps may deteriorate the paper feed roller
and separator performance.
Explain causes to user. Have user
change to the paper conforming to
specifications.
Dirt / foreign matter
intransfer path
Paper gets stuck in transfer path, causing creasing and
tearing.
Remove any dirt or foreign matter.
Incorrect paper feed path
pressure
If pressure on paper is insufficient, paper will not be fed.
If pressure on paper is excessive, double sheets will be
fed.
Explain to users how to select
correct pressure for paper.
Paper may not be fed. Replace paper feed roller.
Paper separator unit gap
If gap is too large, separator unit will rattle in direction of
paper transfer path, causing double sheets to be fed.
If gap is too small, paper separator unit cannot follow
angle change due to paper feed shaft up-down movement,
which may cause double-sheet or slanted feed,
and creasing.
Perform paper separator unit gap
adjustment.
Paper separator unit
Wear, or adhesion of paper scraps causes deterioration
in separating performance, resulting in double-sheet
feed.
Clean separating surfaces.
If any trouble exists, replace.
Perform separator unit gap adjustment
on new unit.
Separation pressure If pressure is very low, no paper will be fed.
Perform separation pressure check.
Elevator top position limit
Paper slant is large, causing creases.
During printing, paper feed errors often occur immediately 
before or after paper tray rises.
Perform elevator top limit sensor
adjustment.
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