Brother FAX-2840 Service Manual page 72

Error code 71
Print Unable 71
Turn the power off and then back on again.
Detected an error in the synchronized signal of the polygon motor for the laser unit.
Error code 72
Print Unable 72
Turn the power off and then back on again.
Cannot detect the signal from the beam sensor for the laser unit.
<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
Correction value error of the
1
laser unit
Connection failure of the laser
2
unit flat cable
3 Main PCB failure
4 Laser unit failure
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.
<User Check>
• Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
Cause
Enter the correction value of the laser unit
correctly.
Reconnect the laser unit flat cable.
Replace the main PCB ASSY.
Replace the laser unit.
Cause
Replace the main PCB ASSY.
2-35
Remedy
Remedy
Confidential