Chapter 1 — Using the PB21 and PB31 Mobile Receipt Printer
10 PB21 and PB31 Mobile Receipt Printer User Guide
Understanding the Backlight
The screen backlight on the printer behaves the same way as a screen
saver on your PC. After a set amount of time elapses without any user
interaction, the backlight goes off. The screen backlight turns on
when:
• the printer begins printing.
• you press a button.
• you connect the printer to external power.
• you are communicating with or sending data to the printer.
You can change the amount of time to have elapse before the
backlight turns off using the Setup menu. Options for backlight are
always off, always on, 5 seconds, 10 seconds, 20 seconds, 30 seconds,
or 60 seconds.
Using the Batteries
The printer uses a rechargeable 7.4 V 2300 mAh lithium-ion battery
(Model AB27) for power. You must fully charge the battery before you
can use the printer. The battery retains a charge for up to five days
when the printer is in Standby mode.
A fully charged battery can usually print over 300 6-inch labels (PB31)
or 500 6-inch labels (PB21) at 25% print density. When the printer
reports low battery, it can usually print over 50 6-inch labels at 10%
print density. The number of labels you can print varies depending on
these factors:
• Age of the battery
• Temperature and humidity of the operating environment
Error • The printer cannot feed paper or print a job because of
a hardware issue such as the media door open, a paper
jam, or there is no media.
• An error occurs such as a paper jam, a print error, or the
printer is out of range.
Understanding the Printer Sounds (continued)
Sound Occurs When:
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