HP 5m C3917A, C2021A, 5n C3952A, 5 C3916A, 4 C2001A HP LaserJet printers are not designed to work

Table 7-30		Communications Checks (continued)
	Checks		Action
If using a serial interface, is the cable			The maximum recommended cable
longer than 50 feet (15 meters)?			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			If possible, try a different printer interface
port?			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.

C a u t i o n	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