HP 4550 Service Manual - Page 270

Interface troubleshooting Note CAUTION Communications checks Communication problems are normally the customer's responsibility. Time spent attempting to resolve these problems might not be covered by the product's Hewlett-Packard warranty. Refer the customer to the network administrator for assistance in troubleshooting network problems. If the printer is not connected to an MS-DOS-based host, proceed to Table 7-10, Communications check. Table 7-10 Communications check Check Action Is your computer configured These parameters are required to communicate with the printer. to the parameters described Verify that the configuration of the computer's communications in the configuration port matches these parameters. instructions? Note: If these parameters are not set properly, an error might display on the control panel. EIO troubleshooting If the printer contains an optional HP JetDirect print server, and you cannot communicate with the printer over the network, verify the operation of the print server. Print an HP JetDirect configuration page. If the message "I/O CARD READY" does not appear on the configuration page, see the troubleshooting section of the HP JetDirect Print Server Software Installation Guide. If the host system and printer still are not communicating, replace the formatter PCB and the EIO card and reconfigure the printer. If the problem persists, a protocol analyzer might be needed to find the source of the problem. HP LaserJet printers are not designed to work with mechanical switch-box products without proper surge protection. These devices generate high transient voltages that cause permanent damage to the formatter PCB. This circumstance is not covered by the Hewlett-Packard warranty. Figure 7-10 HP EIO configuration page 268 Troubleshooting C7085-90921