Causes Symptoms Countermeasure
Printing paper not suit-
able
• If paper is too thick, it won’t be likely fed. If too thin, dou-
ble sheets may be fed.
• Paper not clearly cut: 2 sheets still adhere to each
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 in
transfer 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 cor-
rect pressure for paper.
Worn paper feed roller • 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 move-
ment, 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 sep-
arator unit gap adjustment on new
unit.
Separation pressure • If pressure is very low, no paper will be fed. Perform separation pressure adjust-
ment.
Elevator top position limit • Paper slant is large, causing creases.
• During printing, paper feed errors often occur immedi-
ately before or after paper tray rises.
Perform elevator top limit sensor
adjustment.
Paper feed amount • If amount is too short, paper slant cannot be corrected,
printing position may not be uniform, or paper may not
be fed.
• If amount is too long, loop becomes too large, causing
paper to buckle up between paper feed roller and timing
roller, resulting in feed error.
Perform paper feed amount adjust-
ment.
Paper feed clutch • Clutch slippage will reduce paper feed amount.
• If clutch does not disengage properly, the paper feed
segment gear will not return correctly, leading to
reduced feed amount.
(See “Paper feed amount” above.)
Replace paper feed cluch.
Guide roller pressure &
timing
• If Guide roller pressure is insufficient, paper will not be
gripped properly, and timing roller will not assure con-
stant feed amount. As a result, printing position will not
be uniform. In the worst case, no paper will reach drum.
• If there is a gap between Guide roller and the timing
roller, paper slant cannot be corrected.
Perform escape amount adjustment
and escape timing adjustment.
Timing roller • If the timing roller clutch slips, feed amount will not be
constant. As a result, printing position will not be uni-
form. In the worst case, no paper will reach drum.
• If the timing roller clutch does not disengage properly,
the paper feed segment gear will not return correctly,
leading to reduced and unstable feed amount. As a
result, printing position will not be uniform. In the worst
case, no paper will reach drum.
Clean timing roller clutch . Replace
if necessary.
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