Brother HL-4140CN Service Manual page 303

The Printers window appears as shown below.
2) Right-click the Brother Maintenance USB Printer icon.
3) Click Properties.
The Brother Maintenance USB Printer Properties window appears as shown below.
4) Click the Ports tab.
In this example, the port number assigned to the Brother Maintenance USB Printer is
USB001.
(5) Enter the serial number (the fifteen digits) of the printer into the box on the "Serial No".
(6) Click the [OK] button. The serial number is written in the printer.
Memo
Refer to APPENDIX 1 to know how to read the serial number of the printer.
4-5
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