- HP All-in-One Printer Manual

Q2431-90912 Chapter 7 Troubleshooting 255
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” on page 255.
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 product
warranty.
Computer direct connect (parallel) test
After the printer is installed, verify communications by bypassing the Windows driver between
the printer and the IBM-compatible computer. Type the following 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 [G
O] on
the control panel to print the data 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” on page 241). 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” on page 256. The Jetdirect page contains valuable network related
information about the printer.
If the host system and printer are still not communicating, replace the formatter PCA and the
EIO card and reconfigure the printer.
The following illustration shows the contents of the Jetdirect page.