Brother HL-7050N - Manual (Page 139)

13 - 3 TROUBLESHOOTING
YL4US_FAX2800MFC4800-FM5.5
Brother print servers have three LEDs. These can be used to
diagnose problems.
n
L- LED (green): Link activity
This LED is on if there is a valid connection to the network
(either 10BaseT or 100BaseTX). It is off if no network is
detected.
n
F-LED (orange): Fast Ethernet
This LED will be on if the print server is connected to a
100BaseTX Fast Ethernet network. It is off if the print server
is connected to a 10BaseT network.
n
A-LED (green): Transmission Activity
This LED will blink synchronized to the transmission or
receive status.
4 If you are using a repeater or hub, make sure that SQE
(heartbeat) is turned off at the hub (if applicable). Also, if you
have a hub or multi-port repeater, verify that the hub or repeater
port is good by trying the print server on a different port or on the
other hub or multi-port repeater.
5 If you have a bridge or router located between the print server
and host computer, make sure that the device is set up to allow
the print server to send and receive data from the host. For
example, a bridge can be set up to only allow certain types of
Ethernet addresses to pass through (a process known as
filtering); therefore, such a bridge must be configured to allow
Brother print server addresses. Likewise, a router can be set up
to pass only certain protocols, so be sure that the desired
protocol can be passed through to the print server.
6 If the job exits the queue but does not print, make sure that you
are not trying to print a text job to a PostScript printer. If you
have a printer that is capable of automatic language switching,
make sure that the printer is not forced into PostScript mode.