Brother MFC620CN Service Manual page 317

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.
46 The number of
performed purge
sequences has reached
the limit.
The number of flushing
count has reached the
limit.
47 Not used.
Symptom
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
9 - 4
Probable Cause Solution
Replace the
head/carriage unit.
Replace the main PCB
Replace the power
supply 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.
Confidential