Brother HL-4200CN Network User's Manual page 56

c
If you are running AppleTalk for Macintosh:
Make sure that you can see the print server name under the LaserWriter 8 icon in the Chooser.
If it is visible, then the connection is good, so proceed to the AppleTalk for Macintosh Section.
Otherwise, go to step 3.
3
If you cannot make any of the connections in step 2, check the following:
a
Make sure the printer is powered on and on-line.
b
Check the cabling, network connection, referring to printer settings page and make sure that
the "Ethernet Mode" is not set to "unknown". If the "Ethernet Mode" is set to "unknown", printer
cable may not be connected to the printer.
c
Check to see if there is any LED activity.
Brother print servers have two LEDs.
Green-LED
This LED is on if there is a valid connection to the network 100BaseTX).
Orange-LED
This LED will be on or blink if the print server is connected to a 10BaseT or 100BaseTX
network.
4
If you are using a repeater or hub, make sure that SQE (heartbeat) is turned off at the hub. 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.
TROUBLESHOOTING 10 - 2