9-37 Confidential
9.2.5 Problems encountered frequently in the past
This section lists the four problems most frequently encountered during on-site service in the past.
- Paper jams
- Error message "MACHINE ERROR 4F"
- Ink-related problems
- Auto document feeder (ADF) failure
[ 1 ] Paper jams
A paper jam may occur not only due to machine malfunction but also to the user's actions.
IMPORTANT: In some cases, foreign material that has found its way into the machine without the
user realizing can be the cause a paper jam. Instruct the user to place nothing on top of the machine
that might fall into it.
Problems due to the user's actions
Check Possible causes Problems that may result
Recording paper Paper not suited to use with the
machine was used.
Paper with labels attached, for
example, may leave labels
inside the machine.
For foreign
materials
Fragments of paper that were left
behind when previous paper jams
occurred.
Foreign materials such as tacks
have found their way into the
machine.
Foreign materials can hinder the
paper feed.
Problems due to machine malfunction
Check Possible causes Problems that may result
Star wheels on star
wheel support
Star wheels became dislocated
when paper jam occurred.
Dislocated star wheels can
hinder paper feed.
Sensors and
actuators
Any sensor(s) not working. If a sensor does not turn on, the
related roller(s) will not rotate.
Bank ASSY The bank ASSY has worn thin.
Bank ASSY
Paper tray
A worn section on the bank
ASSY can cause double-
feeding.
CR encoder strip The CR encoder strip is stained. A stained CR encoder strip can
cause a carriage drive error
during printing that will stop the
printing operation.
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