Brother HL-7050N - Manual (Page 27)

1 - 8 ABOUT THIS PRINTER
HL7050_US_UG_FM5.5
Positioning the printer
Please read the following before you use the printer.
Power supply
Use the printer within the recommended power range:
AC power: ±10% of the rated voltage
Frequency: 50/60 Hz (220-240 V) or 50/60 Hz (110-120 V)
The power cord, including extensions, should be no longer than 5
metres (16½ feet).
Do not share the same power circuit with other high-power
appliances, such as an air conditioner, copier, shredder and so on.
If you cannot avoid using the printer with these appliances, we
recommend that you use a voltage transformer or a high-frequency
noise filter.
Use a voltage regulator if the power source is not stable.