Problems Encountered Frequently In The Past; 1 ] Paper Jams; Ink-Related Problems - Brother MFC620CN Service Manual

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 47"

- Ink-related problems

- Auto document feeder (ADF) failure (applicable to models with ADF units)
[ 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
Recording paper
For foreign
materials
Problems due to machine malfunction
Check
Star wheels on star
wheel support
Sensors and
actuators
Bank ASSY
CR encoder strip
Possible causes
Paper not suited to use with the
machine was used.
Fragments of paper that were left
behind when previous paper jams
occurred.
Foreign materials such as tacks
have found their way into the
machine.
Possible causes
Star wheels became dislocated
when paper jam occurred.
Any sensor(s) not working.
The bank ASSY has worn thin.
Bank ASSY
Paper tray
The CR encoder strip is stained.
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Problems that may result
Paper with labels attached, for
example, may leave labels
inside the machine.
Foreign materials can hinder
the paper feed.
Problems that may result
Dislocated star wheels can
hinder paper feed.
If a sensor does not turn on, the
related roller(s) will not rotate.
A worn section on the bank
ASSY can cause double-
feeding.
A stained CR encoder strip can
cause a carriage drive error
during printing that will stop
the printing operation.
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