Xerox Phaser 840 Service Manual page 285

Use the following tools to verify that the printer hardware ports are good. If these operations are successful,
the printer communications hardware is good and no components should be replaced.
C1. The printer is connected by the Ethernet port. This connection can be verified by:
If the problem is isolated to some users, while others can communicate with the printer, the
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hardware is good.
In a TCP/IP environment, open a web browser on a computer connected to the same network as
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the printer and enter the IP address. If the printer's CentreWare IS web page comes up, the
hardware is good.
Use a laptop computer with a cross over cable to connect directly to the printer over TCP/IP. If
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you can open the printer's CentreWare IS web page the hardware is good.
C2 . The printer is connected by the parallel port . This connection can be verified by:
From a DOS prompt enter: "echo showpage > LPT1:" (substitute LPT2:, etc. if the printer is
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connected to a different port). If the printer prints a blank page the hardware is good.
Try reseating the parallel cable (or swap it with a known good cable). If the parallel cable is
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connected to any other devices, remove them and connect the cable directly to the printer.
Repeat the DOS test above.
Connect a different computer to the printer directly with a parallel cable. Repeat the DOS test
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above.
C3 . Refer to infoSMART or the on-line service files for additional information on verifying
communication with the printer in other environments.
Once the hardware is verified, follow your standard procedures to assist the customer with their network or
host computer, or refer them to the local Xerox customer support center for software support.
If the hardware cannot be verified using the above steps, reseat the main board and try the steps again. If the
hardware still fails, replace the main board.
COMMUNICATIONS CHECKLIST
Appendix 269