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2. Notes on safety
Any fluctuations in the power supply voltage
should be within ±10% of the rated voltage for the
machine.
Voltage fluctuations which are greater than this
may cause problems with correct operation.
The power supply capacity should be greater than
the requirements for the sewing machine's electri-
cal consumption.
Insufficient power supply capacity may cause
problems with correct operation.
The ambient temperature should be within the
range of 5°C to 35°C during use.
Temperatures which are lower or higher than this
may cause problems with correct operation.
Machine installation should only be carried out by
a qualified technician.
Contact your Brother dealer or a qualified
electrician for any electrical work that may need to
be done.
The sewing machine weighs more than 25 kg. The
installation should be carried out by two or more
people.
Do not connect the power cord until installation is
complete, otherwise the machine may operate if
the treadle is depressed by mistake, which could
result in injury.
Be sure to connect the ground. If the ground con-
nection is not secure, you run a high risk of receiv-
ing a serious electric shock, and problems with
correct operation may also occur.
CAUTION
Environmental requirements
Installation
EF4-N11, N21, MA4-N31 (English)
The relative humidity should be within the range
of 45% to 85% during use, and no dew formation
should occur in any devices.
Excessively dry or humid environments and dew
formation may cause problems with correct opera-
tion.
In the event of an electrical storm, turn off the power
and disconnect the power cord from the wall outlet.
Lightning may cause problems with correct opera-
tion.
All cords should be secured at least 25 mm away
from any moving parts. Furthermore, do not ex-
cessively bend the cords or secure them too firmly
with staples, otherwise there is the danger that fire
or electric shocks could occur.
Install the belt covers to the machine head and
motor.
If using a work table which has casters, the casters
should be secured in such a way so that they cannot
move.
Be sure to wear protective goggles and gloves
when handling the lubricating oil and grease, so
that they do not get into your eyes or onto your
skin, otherwise inflammation can result.
Furthermore, do not drink the oil or eat the grease
under any circumstances, as they can cause vom-
iting and diarrhoea.
Keep the oil out of the reach of children.
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