Brother MFC-8460N Service Manual page 328

Error Code
(Hex)
Side
69
temperature error
Heater warming-up timeout
6A
error. (Heater does not reach
60 ˚С within 12 second.)
Heater warming-up timeout
6B
error. (Heater does not reach
100 ˚С within 9 second.)
6C Heater temperature exceeds
the
temperature. (270˚С or more
is detected for 1sec.)
6D Not used.
6E Heater temperature does not
go up enough.
6F Heater hard limiter operates
70 Not used.
Scanner
71
synchronize
reference clock.
Cannot detect Beam Detect
72
signal.
Not used.
73
74 Toner empty
75 In casing temperature error.
Symptom
thermistor low
maximum high
motor does not
with the
Probable Cause
Side thermistor break
Thermistor defective
Main PCB defective
Power supply
defective
Thermistor defective
Halogen lamp defective
Main PCB defective
Power supply
defective
Thermistor defective
Main PCB defective
Power supply
defective
Halogen lamp defective
Power supply
defective
Thermistor defective
Power supply
defective
Laser unit defective
Main PCB defective
Laser unit defective
Main PCB defective
Toner sensor defective
Main PCB defective
In casing temperature
sensor defective
Main PCB defective
9-5
Solution
Replace the fuser unit.
Replace the fuser unit.
Replace the main PCB.
PCB Replace the power supply
PCB.
Replace the fuser unit.
Replace the main PCB.
PCB Replace the power supply
PCB.
Replace the fuser unit.
Replace the main PCB.
PCB Replace the power supply
PCB.
Replace the fuser unit.
PCB Replace the power supply
PCB.
Replace the fuser unit.
PCB Replace the power supply
PCB.
Replace the laser unit.
Replace the main PCB.
Replace the laser unit.
Replace the main PCB.
Replace the toner sensor.
Replace the main PCB.
Replace the in casing
temperature sensor.
Replace the main PCB.
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