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10-8
■ Ethernet communication problems
When you connected the Elite 12ppm to an Ethernet cabling system, the printer should
have been switched off to avoid connection problems. Before continuing with these
troubleshooting procedures, switch the printer off, wait ten seconds, and then switch the
printer on.
If the printer will not print:
• Switch off the printer. Switch the printer back on and at the same time watch the LED
between the two Ethernet ports (labeled TX/RX). The LED should flash for a few
seconds. If the LED flashes, the network card is probably operating correctly and the
problem might be with your network.
Note to network administrator: As a test of the printer’s ability to receive data over the
network, you can send echo packets to the printer. This should cause the center LED
to flash. Normal print jobs will not cause the center LED to flash.
If your Elite 12ppm is connected to a 10BASE-2 network:
• Verify that a UTP (unshielded twisted-pair) cable is not connected to the UTP con-
nector. (The Ethernet adapter will acknowledge the UTP connection instead of the
coax connection.)
• Verify that the Ethernet cable has a 50 ohm terminator connected at each end.
• Verify that the Ethernet cable is not connected in a loop configuration. The cable
should be connected as a “linear bus” in which one piece of coax cable is connecting
all the nodes.
If your Elite 12ppm is connected to a 10BASE-T network:
• Verify that the printer is connected to a UTP hub on the other end.
• Verify that the cabling is correctly constructed. The cable should be constructed with a
data grade twisted-pair 2-pair, 3-pair, or 4-pair cable. There should be at least six
twists per foot. Do NOT use straight 25-pair or 50-pair phone cables (this cable does
not meet the criteria set for UTP cables, and will cause communication errors).
If the Elite 12ppm printer name does not appear in the right scroll box after selecting the
LaserWriter 8 icon in the Chooser:
• Verify that the correct zone is selected. Ethernet and AppleTalk connections may
appear in different zones.
■ Macintosh system crashes
If your Macintosh system crashes while a document is printing, try the following: