Standard Adjustment; Safety Switch Position - Brother T-8422C Instruction Manual

13. STANDARD ADJUSTMENT

Maintenance and inspection of the sewing machine
should only be carried out by a qualified technician.
Ask your Brother dealer or a qualified electrician to
carry out any maintenance and inspection of the
electrical system.
If any safety devices have been removed, be
absolutely sure to re-install them to their original
positions and check that they operate correctly
before using the machine.
Secure the table so that it will not move when tilting
back the machine head. If the table moves, it may
crush your feet or cause other injuries.

13-1. Safety switch position

If the spring operating stroke is too short,
the safety switch will not operate.
Machine bed
CAUTION
The standard installation position for the safety switch (1) is
shown in the illustration at left.
At the time of shipment from the factory, dimension (A) is
adjusted to 3 mm, and normally this does not need to be
readjusted.
However, if the dimensions of the work table make it so that
the gap between the machine bed and the table hole is wider
or narrower than the standard gap (1.5 mm), it may have an
adverse effect on the operation of the safety switch (1). If this
happens, adjust as follows.
Table
* If the operation of the safety switch (1) is affected in this
way, the sewing machine will not start when the treadle is
depressed.
< Adjustment method >
1. Loosen the screw (2).
2. Move the safety switch (1) to the left or right to adjust its
position so that the gap (B) between the safety switch (1)
and the table is 4.5 mm.
3. Tighten the screw (2).
3013M
T-8421C, 8422C, 8452C, 8722C, 8752C
13. STANDARD ADJUSTMENT
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.
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times,
otherwise the machine may operate if the treadle is
depressed by mistake, which could result in injury.
・ When carrying out inspection, adjustment and
maintenance
・ When replacing consumable parts such as the
rotary hook and knife
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to
observe all safety precautions.
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