Brother Facsimile Equipment MFC7420 - Manual (Page 193)

Confidential 9-5
[ 2 ] Error codes shown in the "MACHINE ERROR X X" message
Error Code
(Hex)
Symptom Probable Cause Solution
56 The back cover is opened. The back cover is
opened. Close the back cover.
57-5A Not used.
New toner actuator
lever broken Replace the new toner
actuator. 5B New toner sensor
Error
(New toner sensor stays on)
New toner sensor
defective Replace the new toner
sensor.
5C Not used.
5D-69 Not used.
Thermistor defective Replace the thermistor. 6A Heater warming-up timeout
error. (Heater does not reach
60 ˚С
w ithin 11 second.)
Halogen lamp defective Replace the halogen lamp.
Thermistor defective Replace the thermistor. 6B Heater warming-up timeout
error. (Heater does not reach
100 ˚С
w ithin 15 second.)
Halogen lamp defective Replace the halogen lamp.
Thermistor defective Replace the thermistor. 6C Heater temperature exceeds
the maximum high
temperature. (270˚С or more
is detected for 1sec.)
Power supply PCB
defective Replace the power supply
PCB.
6D Not used.
Halogen lamp defective Replace the halogen lamp. 6E Heater temperature does not
go up enough.
Power supply PCB
defective Replace the power supply
PCB.
Thermistor defective Replace the thermistor. 6F Heater hard limiter operates.
Power supply PCB
defective Replace the power supply
PCB.
70 Not used.
Laser unit detective Replace the laser unit
71 Scanner motor does not
synchronize with the reference
clock.
Main PCB detective Replace the main PCB
Laser unit detective Replace the laser unit 72 Cannot detect Beam Detect
signal.
Main PCB detective Replace the main PCB
73 The drum unit is not mounted.
(Not used)
Toner sensor defective Replace the toner sensor. 74 Toner empty
Toner empty Replace the toner
cartridge.
75 In casing temperature error. Thermistor in the Frame
L ASSY defective Replace the Thermistor in
the Frame L ASSY.