Brother MFC640CW Service Manual page 257

Error Code
(Hex)
40-41 Not used.
42 The head drive voltage has
not dropped from the high
to low level within the
specified period.
43 The head thermistor has
been opened or shorted
abnormally.
44 The temperature of the
print head driver has risen
abnormally.
The head driver chip
temperature sensor in the
COF detect abnormally
high temperature.
45 Not used.
The number of performed
46
purge sequences has
reached the limit.
The number of flushing
operations has reached the
limit.
47 Not used.
Symptom
9- 6
Probable Cause
Piezoelectric (PZT)
ceramic actuator
defective
Head flat cables broken
Head flat cables and
carriage-head flat cable
not connected correctly
Carriage PCB defective
Main PCB defective
Head property
parameters incorrect in
the EEPROM
Head/carriage unit
broken
Head flat cables and
carriage-head flat cable
not connected correctly
Head flat cables broken
Carriage-head flat
cable broken
Main PCB defective
Purge counter overflown
Flushing counter
overflown
Solution
Replace the
head/carriage unit.
Replace the power
supply PCB.
Replace the main PCB.
Replace the head flat
cables.
Correct those flat
cables.
Replace the carriage
PCB.
Replace the main PCB.
Enter the correct
parameter values.
Replace the
head/carriage unit.
Correct those flat
cables.
Replace the carriage
PCB.
Replace the
head/carriage unit.
Replace the main PCB.
Replace the ink absorber
box and reset the purge
counter to zero.
Replace the flushing
case and reset the
flushing counter to zero.
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