Brother MFC5100C Service Manual page 16

The setup utility will transmit the ID code data from your PC to the facsimile machine and
then it will terminate.
The facsimile machine will automatically return to the standby mode.
(3) To check whether the entered character string (ID code) is correct, make the machine enter the
maintenance mode (refer to CHAPTER 5, Section 5.1) and then press the 1 key twice
(Subsection 5.3.6).
The facsimile machine will print out a Configuration List. At the right top of the list, "SER.#:
BROXXXXXXXXX" is printed.
(4) Check that the character string entered in step (2) is printed in "XXXXXXXXX."
If it is OK, press the 9 key twice to exit from the maintenance mode.
If something other than that is printed in XXXXXXXXX, check the connection between the
PC and facsimile machine and go back to step (1).
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