Brother DCP-6690CW, Service Manual, Page: 127 / 506

4-15 Confidential
Error Code
(Hex)
Symptom Probable Cause Solution
3E Recording error related
to ASF motor, paper feed
motor, and carriage
motor. ASF encoder disk, PF
encoder disk, or CR encoder
strip stained or scratched Replace the ASF motor ASSY,
PF encoder disk, or CR
encoder strip.
ASF, PF, or CR encoder
defective Replace the ASF motor ASSY,
PF encoder PCB, or carriage
PCB.
ASF, PF, or CR motor
defective Check the ASF motor, paper
feed motor, and carriage motor,
then replace the defective
one(s).
Main PCB defective Replace the main PCB.
40 The casing internal
temperature thermistor
has detected abnormal
temperature in the
machine. Main PCB defective Replace the main PCB.
Casing internal temperature
thermistor defective Replace the ink refill ASSY.
41 Not used.
42 The head drive voltage
has not dropped from the
high to low level within
the specified period. Piezoelectric ceramic
actuator or head driver
defective Replace the head/carriage unit.
Carriage PCB defective Replace the carriage PCB
ASSY.
Main PCB defective Replace the main PCB.
43 The head thermistor has
been opened or shorted
abnormally. Head flat cables not
connected correctly Correct those flat cables.
Head flat cables broken Replace the carriage PCB
ASSY.
Carriage PCB defective
Main PCB defective Replace the main PCB.