Brother MFC-7240 - Cleaning the Corona Wire

2-35
Confidential
 Error code 71
Detected an error in the synchronized signal of the polygon motor for the laser unit.
Error code 72
Cannot detect the signal from the beam sensor for the laser unit.
 Error code 73 and 74
These errors do not usually occur in the normal use. The conceivable causes are noise
around the installation site, fluctuation of the power supply voltage, and failures in the
software.
An unidentified error occurred.
Print Unable 71
Turn the power off and then back on again.
Print Unable 72
Turn the power off and then back on again.
<User Check>
• There is a possibility that the condensation has occurred. Turn OFF the power, and
leave the machine at least one hour in a well-ventilated place. And then turn ON the
power.
Step Cause Remedy
1
Correction value error of the
laser unit
Enter the correction value of the laser unit
correctly.
2
Connection failure of the laser
unit flat cable
Reconnect the laser unit flat cable.
3 Main PCB failure Replace the main PCB ASSY.
4 Laser unit failure Replace the laser unit.
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<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step Cause Remedy
1 Main PCB failure Replace the main PCB ASSY.