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Brother HL-5440D Service Manual Page 74

Brother laser printer.
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Error code 7000
This error does not usually occur during normal use. The possible causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
---
An unidentified error occurred.
Step
1
Main PCB failure
Error code 7100
Print Unable 71
Detected an error in the synchronized signal of the polygon motor for the laser unit.
Error code 7200
Print Unable 72
Cannot detect the signal from the beam detecting sensor for the laser unit.
<User Check>
• Turn OFF the power switch. Leave the machine in a well-ventilated location at normal
temperature to remove condensation.
Step
Connection failure of the laser
1
unit flat cable
2
Laser unit failure
3
Main PCB failure
Error codes 7300 and 7400
These errors do not usually occur during normal use. The possible causes are noise around
the installation site, fluctuation of the power supply voltage, and failures in the software.
---
An unidentified error occurred.
Step
1
Main PCB failure
Error code 7500
Cooling Down
The side thermistor of the fuser unit detected a temperature higher than the specified value.
Step
1
Eject sensor PCB failure
2
Side thermistor failure
3
Main PCB failure
Cause
Replace the main PCB ASSY.
Cause
Check the connection of the laser unit flat
cable, and reconnect it if necessary.
Replace the laser unit.
Replace the main PCB ASSY.
Cause
Replace the main PCB ASSY.
Cause
Replace the eject sensor PCB ASSY.
Replace the fuser unit.
Replace the main PCB ASSY.
2-38
Remedy
Remedy
Remedy
Remedy
Confidential

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