AD278A/AD279A PCI MUX Support Guide, June 2006

Troubleshooting
Printer Problems
Chapter 2
30
Printer Problems
Table 2-4 lists the problems you may encounter while using a printer:
Table 2-4 Printer Problems
Problems Causes Actions
• No output
• Printer overflows after
printing correctly
• Printing is garbled
These problems can occur because
of any of the following reasons:
• General port problem
• The printer connection is not
wired correctly.
• The port and printer settings
are mismatched on baud rate,
character size, or parity.
• Printer losing stty settings
after closing the port
Perform one of the following actions:
•Use the pmux_diag utility to send
data to the printer. Verify whether
cables and connectors are
connected properly, the printer is
powered on and is on-line.
If no data is printed, check the
port by placing a terminal in place
of the printer and use pmux_diag
utility to send data. If data is
printed on the terminal, then
there is a problem with the
printer. Check your printer
documentation to see whether the
printer requires any special
handshaking. If this is the case,
your printer may require a special
cable.
If the devices do not work, the
problem may be with the port.
Ensure that you are using the
correct device name. Connect the
printer on another port that is
verified.
• If your printer is overflowing, the
port may be losing its stty
settings. This happens if the print
spooler opens and closes the port
between print jobs. To keep the
port open and always force
software flow control on the ports,
enter the following command at
HP-UX prompt:
$ pmux_stty +lp < /dev/tty1a1