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10. STANDARD ADJUSTMENTS
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.
10-1. Adjusting the thread take-up spring
<-3>
6 - 8 mm
<-5>
4 - 6 mm
3857M
CAUTION
3858M
<-3> 0.25 - 0.35 N
<-5> 0.3 - 0.5 N
3859M
Turn off the power switch and disconnect the power
cord from the wall outlet at the following times.
The motor will keep turning even after the power is
switched off as a result of the motor's inertia. Wait
until the motor stops fully before starting work.
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
If the power switch needs to be left on when carrying
out some adjustment, be extremely careful to
observe all safety precautions.
<Thread take-up spring position>
The standard position of the thread take-up spring (1) is 6-8
mm [4-6 mm for -5 specifications] above the surface of the
thread guide (3) when the presser foot (2) is lowered.
1. Lower the presser foot (2).
2. Loosen the set screw (4).
3. Turn the thread tension bracket (5) to adjust the spring
position.
4. Securely tighten the set screw (4).
<Thread take-up spring tension>
The standard tension of the thread take-up spring (1) varies
in accordance with the machine specifications as shown in
the table.
-3 specifications
-5 specifications
1. Push the needle thread with your finger until it is slightly
higher than the thread tension bracket (5) and so that the
upper thread is not pulled out.
2. Pull the upper thread down until the thread take-up spring
(1) is at the same height as the base of the thread guide
(3), and then measure the tension of the thread take-up
spring (1).
3. Insert a screwdriver into the slot of the tension stud (6),
and turn the screwdriver to adjust the tension of the
thread take-up spring (1).
S-1110A
10. STANDARD ADJUSTMENTS
0.25 - 0.35N
0.30 - 0.5N
16
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