Auto Document Feeder (Adf) Malfunction (Applicable To Models With Adf Units) - Brother MFC620CN Service Manual

Problems due to machine malfunction
Check
Head/carriage unit
Maintenance unit
CIS unit
[ 4 ]

Auto document feeder (ADF) malfunction (Applicable to models with ADF units)

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
Document guides
on the upper ADF
chute
Inside the ADF
Scanner cover
(Scanner unit)
Possible causes
- Air bubbles, high viscosity ink,
or foreign materials have found
their way into the head/carriage
unit.
- Head flat cables are broken.
- Head flat cables have not been
inserted into the carriage PCB.
- Air bubbles, high viscosity ink,
or foreign materials get into the
maintenance unit.
- Torque not transmitted
- Drain tube bent or pinched
The CIS unit is weak in identifying
colors.
Possible causes
The document guides are not
positioned to match the width of
document(s) loaded.
- Foreign materials have found
their way into ADF.
- The size of the document loaded
is smaller than the specified size.
The scanner cover is not closed
properly.
9 - 3 7
Problems that may result
Dot missing occurs on the
printout.
The machine will not be able to
print or drive the head/carriage
unit.
Head cleaning operation will
not be possible and/or the
maintenance unit will not work.
The quality of print colors in
copying operation will be low.
Problems that may result
Documents will skew.
Foreign materials can hinder
document feeding.
The document will jam inside
the ADF.
The "Cover is Open" message
will appear and the machine
will no longer operate.
Confidential