Brother HL-5440D Service Manual page 92

Error code F900
Machine Error F9
The country code was not entered correctly.
Step
Power switch was turned OFF
while "PARAMETER INIT" is
1
displayed during execution of
function code 74.
Error codes FA00 to FF00
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
Cause
Reenter the country code.
(Refer to
code: 74)" in Chapter
Cause
Replace the main PCB ASSY.
2-56
Remedy
"1.3.16 Setting by country (function
5.)
Remedy
Confidential