Error Code 71/72/73/74 - Brother DCP-7055 Service Manual

■ Error code 71
Print Unable 71
Turn the power off and then back on again.
Polygon motor error in the laser unit.
Error code 72
Print Unable 72
Turn the power off and then back on again.
Beam detecting sensor error of the laser unit.
Step
Correction value error of laser unit
1
Harness connection failure of laser
2
unit
3 Main PCB failure
4 Laser unit failure
■ Error code 73
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.
Print Unable 73
Turn the power off and then back on again.
Error, which cannot be specified, occurs.
Error code 74
Replace Toner
Open the Front Cover, replace Toner Cartridge.
Error, which cannot be specified, occurs.
<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
Cause
Cause
2-44
Remedy
Input the correction value of the laser unit
correctly.
Check the harness connection of the laser
unit and reconnect them.
Replace the main PCB ASSY.
Replace the laser unit.
Remedy
Replace the main PCB ASSY.
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