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When I install the USB software, I get an “Unknown
device is found” message.
Disconnect the USB cable, remove the printer software, and turn
off the computer and printer. Unplug the electrical power to the
printer, then reconnect your printer and restart the USB
software installation.
After I installed my printer, why isn’t my HP
DeskJet printer assigned to an LPT printer port in
the Print dialog box of my software application?
USB uses a different naming convention for USB devices. After
the printer has been installed, you see USB/DeskJet 640C/
(serial number of your printer).
How can I increase printing speed?
When operated on a USB chain, your printer may become
slower if other USB devices or software applications are being
used while you’re printing. For optimal print performance, avoid
using other devices in the USB chain while printing.
More information about your
printer software
Closing Software Programs
Before installing the printer software on a computer, close any
virus protection programs or other software programs that are
open and running on the computer, except the HP DeskJet
installer, Windows Explorer, or Program Manager.
For Windows 95, 98, and NT 4.0:
•
Right-click on the software program’s name or icon on the
taskbar. Select Close. Repeat these steps for each open
software program except Windows Explorer.
For Windows 3.1x:
1 While holding down the Alt key, press the Tab key to locate
an open software program.
2 When you locate an open software program, release both
keys.
3 Select File
➙ Exit.
4 Repeat these steps for each open software program, except
Program Manager.