Brother DCP6690CW Service Manual page 129

Error Code
Symptom
(Hex)
49 The head drive voltage
has not risen to the
specified level.
4A-4E Not used.
4F The head drive voltage
has dropped from the
high to low level in an
abnormally short period.
The head drive voltage
has not risen to the
specified level within
the specified period in
the self-diagnosis.
50 The purge cam switch
51 does not come ON or
OFF even after the purge
cam has been driven by
the specified number of
pulses.
Probable Cause
Head flat cables and
carriage-head flat cable not
connected correctly
Head/carriage unit defective
Main PCB defective
Power supply PCB defective Replace the power supply
Piezoelectric ceramic
actuator defective (Cracks or
rare short)
Main PCB defective
Planetary arm assembly not
engaged correctly
Purge cam switch harness
not connected correctly
Purge cam switch broken
Gear(s) on the maintenance
unit broken
Paper feed motor defective
Power supply PCB defective Replace the power supply
Main PCB defective
4-17
Solution
Correct those flat cables.
Replace the carriage PCB
ASSY.
Replace the head/carriage unit.
Replace the main PCB.
PCB.
Replace the carriage PCB
ASSY.
Replace the head/carriage unit.
Replace the main PCB.
Set the maintenance unit into
place.
If the planetary arm does not
move smoothly, clean it.
Correct the connection to the
main PCB.
Replace the maintenance unit.
Replace the engine unit.
PCB.
Replace the main PCB.
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