Brother MFC-J3520 Service Manual page 256

The Brother Maintenance 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.
(7) In the Serial No box on the BrUsbSn screen, type the 15-digit serial number which
is printed on the serial number label attached to the machine.
(8) In the Head Info. box, type the 13-digit head property code. The head property
data is printed on the bar code label attached to the head/carriage unit.
Tip: Opening the scanner cover when the machine is on standby and holding
down the X key for at least 5 seconds moves the head/carriage unit to the
center of its travel. This makes it possible to check the head property label
through the opening.
(9) Click the OK key.
(10)Wait for the confirmation screen of the serial number entered and the head
property code to appear, then click Yes.
(11)Use Maintenance mode 80
and check that the entered data is correct.
Head property data
to display the serial number and head property data
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