Brother MFC640CW Service Manual page 259

Error Code
(Hex)
53-56 Not used.
57 After a purging operation,
the head/carriage unit will
not return to the home
position (capping
position).
58, 59 Not used.
5A The purge cam stops
abnormally when it is in
operation.
5B The pump stops
abnormally during air
ventilation.
5C The pump stops
abnormally during purging
operation.
Symptom
9- 8
Probable Cause
Head cap unit, head
wiper or other parts on
the maintenance unit
interfering with the
head/carriage unit
CR encoder strip
stained
Any obstacles on the
travel path of the
head/carriage unit
Carriage motor
defective
Head/carriage unit
defective
Main PCB defective
Power supply PCB
defective
Purge cam gear broken
Abnormal load applied
to the purge cam
PF encoder disk being in
contact with the upper
cover and deformed
PF roller gear L broken
Switching arm assembly
broken
Foreign materials in the
machine
Clutch gear broken
PF sensor PCB defective
Main PCB defective
Power supply PCB
defective
Paper feed motor
defective
Solution
Set these parts back into
place.
If any part on the
maintenance unit does
not operate smoothly,
replace the unit.
Clean the CR encoder
strip.
Clean the CR guide rail
and CR support chassis.
Replace the carriage
motor.
Replace the
head/carriage unit.
Replace the main PCB.
Replace the power
supply PCB.
Replace the maintenance
unit.
Replace the PF encoder
disk.
Replace the engine unit.
Replace the maintenance
unit.
Remove foreign materials.
Replace the clutch gear.
Replace the PF sensor
PCB.
Replace the main PCB.
Replace the power supply
PCB.
Replace the paper feed
motor.
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