User Guide

Interface troubleshooting

The following sections provide instructions for interface troubleshooting.

Communications checks

NOTE Communication problems are normally the customer's responsibility. Time spent

attempting to resolve these problems might not be covered by the Hewlett-Packard product

warranty. Refer the customer to the network administrator for assistance in troubleshooting

network problems.

If the printer is not connected directly to a Windows or MS-DOS-based host, see EIO troubleshooting.

CAUTION HP LaserJet printers are not designed to work with mechanical switch-box

products that do not have the correct surge protection. These devices generate high transient

voltages that cause permanent damage to the formatter PCA. This circumstance is not

covered by the HP product warranty.

Computer direct connect (parallel) test

After the printer is insalled, verify communications by bypassing the Windows driver between the

printer and the IBM-compatible computer. Type the following information at the MS-DOS prompt:

C:\DIR>LPT1 Enter (for printing to parallel port #1)

The printer should print a directory listing of the C:\ directory. You might need to press

ELECT

ENU

button) on the control panel to print the data that is in the buffer.

EIO troubleshooting

If the printer contains an optional HP Jetdirect print server, and you cannot communicate with the

printer over the network, verify that the print server is operating. Print a configuration page (see

Configuration page). If the Jetdirect card does not appear under "Installed personalities and options"

on the configuration page, reseat or replace the Jetdirect EIO card. See the troubleshooting section

of the HP Jetdirect Print Server Software Administrators Guide.

When the HP Jetdirect print server is installed correctly, print a Jetdirect page (this page

automatically prints when a Jetdirect print server is installed and a configuration page is printed). See

Jetdirect page/Embedded Jetdirect page (HP LaserJet 4250/4350 Series printers). The Jetdirect

page contains valuable network-related information about the printer.

If the host system and printer are still not communicating, replace the formatter and/or the EIO card

and reconfigure the printer. If the host system and printer continue to not communicate replace the

entire formatter.

The following illustration shows the contents of the Jetdirect page.

Interface troubleshooting 331