11 - 12 • Maintenance and Troubleshooting• For DOS printing, make sure the correct MODE statements are in yourAUTOEXEC.BAT file.• For PostScript printing, make sure that the Elite XL 20ppm printer driver isselected.n Ethernet communication problemsWhen you connected the Elite XL 20ppm to an Ethernet cabling system, the printershould have been switched off to avoid connection problems. Before continuing withthese troubleshooting procedures, switch the printer off, wait ten seconds, and thenswitch the printer on.If the printer will not print:• Switch off the printer. Switch the printer back on and at the same time watchthe LED next to the 10 BASE-T Ethernet port. The LED should flash for a fewseconds. If the LED flashes, the network interface is probably operating cor-rectly and the problem might be with your network.Note to network administrator: As a test of the printer’s ability to receive dataover the network, you can send echo packets to the printer. This should causethe LED to flash. Normal print jobs will not cause the LED to flash.If your Elite XL 20ppm is connected to a 10BASE-2 network:• Verify that a UTP (unshielded twisted-pair) cable is not connected to the UTPconnector. (The Ethernet adapter will acknowledge the UTP connection insteadof 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. Thecable should be connected as a “linear bus” in which one piece of coax cable isconnecting all the nodes.If your Elite XL 20ppm 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 constructedwith a data grade twisted-pair 2-pair, 3-pair, or 4-pair cable. There should be atleast 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 commu-nication errors).
