Brother MFC-3340CN Service Manual page 290

Problems due to machine malfunction
Check
Main PCB
ADF
Pressure roller
Document rear
sensor
Possible causes
The motor driver IC is defective.
The spring plate of the ADF parts
are deformed.
The ADF parts are deformed or
worn.
The pressure roller is dislocated or
warped.
- The document rear sensor is
defective.
- The document rear sensor
actuator is deformed.
9-39
Problems that may result
Documents will not be able to
be drawn in.
Documents will stop halfway
through feeding.
Two or more sheets of
documents will be fed through
at once.
Documents will not be able to
be drawn in.
Documents will stop halfway
through feeding or the machine
will not be able to recognize
them.
Confidential