Brother HL-4140CN Service Manual page 85

■ Error code 7E
Replace Belt
Open the Front Cover, replace the Belt Unit.
Belt unit is at the end of life. (The operation is stopped.)
<User Check>
- Replace the belt unit with a new one and reset the counter.
(Refer to "2.3 Parts Life Reset Function" in Chapter
Step
1 Main PCB failure
■ Error code 7F
-
This error does 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.
<User Check>
- Turn OFF the power switch, and turn it ON again after a while.
Step
1 Main PCB failure
Cause
Cause
2-54
5.)
Remedy
Replace the main PCB ASSY
Remedy
Replace the main PCB ASSY.
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