Brother HL-1040 - Manual (Page 271)

CHAPTER 6 TROUBLESHOOTING
6-3
Error Action
Serial Interface Overrun
Error
(For HL-1040/1050 Only)

Press the panel
switch to resume printing.

The interface hardware may be damaged. Consult your
dealer.
Serial Interface Input
Buffer Overflow
(For HL-1040/1050 Only)

Press the panel
switch to resume printing.

Check the communication parameters such as the
handshake protocols on both your computer and printer.

If the error occurs again, the interface hardware may be
damaged. Consult your dealer.
✒ Note
If the printer does not operate as you expect it to, it is recommended that
you turn off the
power switch, wait a few seconds and then turn it on
again. If you still have problems, consult your dealer or our authorized
service representative.