4-41 Confidential
Problems due to machine malfunction
Check Possible causes Problems that may result
Head/carriage unit
- Air bubbles, high viscosity ink, or
foreign materials have found their
way into the head/carriage unit.
- Head flat cables are broken.
- The carriage-head flat cable has
not been inserted into the carriage
PCB.
Dot missing occurs on the
printout.
The machine will not be able to
print or drive the head/carriage
unit.
Maintenance unit
- Air bubbles, high viscosity ink, or
foreign materials get into the
maintenance unit.
- Torque not transmitted.
- Drain tube bent or pinched.
Head cleaning operation will
not be possible and/or the
maintenance unit will not work.
CIS unit The CIS unit is weak in identifying
colors.
The quality of print colors in
copying operation will be low.
[ 4 ] Auto document feeder (ADF) malfunction (For models with ADF)
An ADF failure may occur not only due to machine malfunction but also to the user's actions.
Problems due to the user's actions
Check Possible causes Problems that may result
Document guides The document guides are not
positioned to match the width of
document(s) loaded.
Documents will skew.
Inside the ADF - Foreign materials have found
their way into ADF.
- The size of the document loaded
is smaller than the specified size.
Foreign materials can hinder
document feeding.
The document will jam inside
the ADF.