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 hostsystem 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