Online User's Guide (PDF)

Reference
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7
Indicator Warnings 7
Problem Solution
The POWER indicator does not light The printer is receiving no power.
Confirm that the rechargeable Li-ion battery is correctly inserted
(see Installing the Rechargeable Li-ion Battery on page 4).
If you are using AC or DC power, make sure that the AC adapter or
car adapter is properly connected (see Using the Rechargeable
Li-ion Battery on page 4) and make sure that the AC or DC power
outlet is turned on.
If you are using DC power, check the fuse.
Head or motor is cooling down The thermal head or motor is too hot.
Head:
If the thermal head becomes even hotter, the thermal head may
produce imaging on the paper in areas not intended to be printed.
This condition is normal when printing documents with a great deal
of “black” content.
The printer will stop and resume printing after the print head has
cooled down.
To avoid or delay the onset of this condition, print using a lighter
density setting, reduce the amount of black space being printed (for
example, remove background shading and colors in graphs and
presentation documents), and make sure that the printer has
adequate ventilation and is not located in an enclosed space.
Motor:
Do not use the printer continuously. If the printer is used
continuously, the motor will become too hot. In this case, the printer
will stop and resume printing after the motor has cooled down.
Note
This condition may occur more often when the printer is used at
high altitude (more than about 10,000 feet) due to a lower air
density available to cool the printer.
Data reception error Data may not be received correctly when communications are
unstable.Try connecting again when communication conditions
have improved.
Printer is in boot mode The AC adapter was unplugged while the firmware was being
updated, and the printer started up in boot mode the next time it
was started.
Contact your reseller or Brother Customer Service for assistance.