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2. Notes on safety
Use the sewing machine in an area which is free
from sources of strong electrical noise such as
electrical line noise or static electric noise.
Sources of strong electrical noise may cause
problems with correct operation.
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 power
consumption.
Insufficient power supply capacity 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 approximately 43 kg.
The installation should be carried out by two or
more people.
Do not connent the power cord until installation is
complete. 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
connection is not secure, you run a high risk of
receiving a serious electric shock, and problems
with correct operation may also occur.
ii
CAUTION
Environmental requirements
Installation
T-8420B, 8450B, 8720B, 8750B
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.
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
operation.
In the event of an electrical storm, turn off the power
and disconnect the power cord from the wall outlet.
Lightning
may
cause
operation.
All cords should be secured at least 25 mm away
from any moving parts. Furthermore, do not
excessively bend the cords or secure them too
firmly with staples, otherwise there is the danger
that fire or electric shocks could occur.
If using a work table which has casters, the casters
should be secured in such a way so that they
cannot move.
Use both hands to hold the machine head when
tilting it back or returning it to its original position. If
only one hand is used, the weight of the machine
head may cause your hand to slip, and your hand
may get caught.
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
vomiting and diarrhea.
Keep the oil out of the reach of children.
problems
with
correct
problems
with
correct
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