13. TROUBLESHOOTING
13. TROUBLESHOOTING
• Please check the following points before calling
for
repairs
or
service.
•
If
the following suggestions do
not
solve the problem, turn
off
the machine power supply and contact
your
nearest
Brother service center.
A CAUTION
• Turn
off
the power switch and disconnect the power cord before carrying
out
troubleshooting, otherwise
the machine
will
operate
if
the treadle is pressed by mistake, which could result in injury.
* When using a clutch motor, 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.
Problem
1.
Upper thread is not tight.
2.
Lower thread is
not
tight.
3.
Skipped stitches occur while
sewing
~
.......
...........
Possible cause
•
Is
the upper thread tension too weak,
or
is the lower thread tension
too strong?
Adjust the upper thread tension
or
lower thread tension.
•
Is
the needle and feed mechanism
timing
correct?
Advance the needle timing.
•
Is
the lower thread tension too weak,
or
is the upper thread tension
too strong?
Adjust the lower thread tension
or
upper thread tension.
•
Is
the needle
tip
bent?
Is
the needle
tip
blunt?
If
the needle
tip
is bent
or
broken, replace the needle.
•
Is
the needle properly installed?
If
it
is incorrect, install the needle correctly.
•
Is
the machine properly threaded?
If
it
is incorrect, thread the thread correctly.
•
Is
the presser foot pressure too weak?
Adjust the presser foot pressure .
•
Is
the needle too thin?
Replace the needle with a needle that
is
one rank thicker.
•
Is
the presser foot
too
high?
Adjust the height
of
the presser foot.
•
Is
the needle and rotary hook timing incorrect?
Adjust the height
of
the needle bar.
Adjust the clearance between the needle and the rotary hook.
•
Is
the thread tension spring too weak?
Adjust the tension
of
the thread tension spring.
082-8720 series
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