HP HB4 User Manual page 90

miscellaneous
Symptom
PC date and time display is
incorrect.
Printer has problems.
84
user's guide
Problem
RTC (real-time clock) battery
may need to be replaced.
Battery life is approximately
3–5 years.
Printer will not print correctly
or at all.
Solution
First, reset the date and time in your operating system by
using the Control Panel. If the problem persists, replace the
battery. See the Upgrading and Servicing Guide for
instructions, or refer to the Warranty & Support Guide to
contact Support for replacement details.
If you encounter printer problems, refer to the
documentation that came with your printer.