HP LaserJet 4 Service Manual - Page 285
Caution, Checks, Action, Table 7-30
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Table 7-30 Communications Checks (continued) Checks Action If using a serial interface, is the cable longer than 50 feet (15 meters)? The maximum recommended cable length for RS-232 serial communications is 50 feet. Use RS-422 for the HP LaserJet 4/4M printer, or move the printer closer to the host. If using a Centronics parallel cable, is it Use a serial interface connection, or over 10 feet (3 meters) long? move the printer closer to the host. Do all the current Control Panel Make appropriate changes. If host Configuration Menu items match the host system changes are made, be sure to system's parameters? reboot the system, or otherwise ensure the changes are in effect. Does the printer have a bad interface port? If possible, try a different printer interface than the one with the problem. Reconfigure the printer and host. Does the host have a bad interface port? If possible, try a different host system port, and reconfigure both the host and printer appropriately. If the host system and printer still are not communicating, and steps 1 through 9 have been completed, replace the Formatter PCA and the MIO card, and reconfigure the printer. If the problem persists, a protocol analyzer may be needed to find the source of the problem. Caution 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 PCA. This circumstance is not covered by the Hewlett-Packard warranty. Troubleshooting 7-55