TROUBLESHOOTING
If
you notice any
of
the problems listed below, refer
to
the "Remedy" column
for
instructions on
how
to solve the problem.
*
If
this does not solve the problem,
or
if
the problem you
are
experiencing is not listed below, contact your nearest
Brother dealer
or
a qualified technician
to
carry out the necessary adjustment.
Problem
The
thread comes
out
of
the
needle
1-
hole at the
sewing
start.
The upper
thread
breaks during sew-
1-
in
g.
L_
________
P_o_s_s_ib_l_e_c_a_u_se--------~~~
~
____________
R_e_m_e_d_y------------~~-Pa_g_e~~
~
~
H
'-----
The needle is installed incorrectly.
The needle is bent, or the needle
tip
is
broken or blocked.
The thread thickness does
not
match the
needle
size.
The needle is
of
the wrong type.
The needle is touching the needle plate.
The bobbin case is incorrectly
installed
to
the rotary hook.
The material is being overstretched during
sewing.
The thread take-up lever is
not
at its highest
position at the sewing start
The thread end is too short for the needle
hole when threading the upper thread.
The pretension is
too
strong.
The needle up stop position is too high and
the thread take-up crank
pulls
out
the upper
thread.
r-J
The thread has been threaded incorrectly.
H The needle
is
bent
or
the needle tip
is
broken or blocked.
H The needle is installed incorrectly.
-
The thread
is
caught on something in the
thread path.
y The. threads
are rubbing together while
sewmg.
• The upper thread tension is too strong.
-
• The upper thread tension is too weak.
• The lower thread tension is too strong.
··-
H
The needle hole is too small for the thread.
y The needle is
of
the wrong type.
-44-
-
1-
1-
Install the needle correctly.
Replace the needle.
Use a needle that is suitable for the thread.
Use the correct type
of
needle.
Re-seat the needle plate.
Install the bobbin case correctly.
Be
careful
not
to pull the material too much.
Set the thread take-up lever
to
the highest
1/1
position at the sewing start.
Approx.
50
mm
of
thread should be coming
21
out
of
the needle hole.
Adjust the pretension.
27
Retard the needle up stop position timing.
36
Thread the thread correctly.
21
Replace the needle.
20
Install the needle correctly.
20
• Uncatch the thread.
I
•
If
the thread is twisted too strongly, re-
place the thread.
If
the thread
is
twisted too strongly, replace
1/1
the thread.
Adjust the thread tension.
26
Use a needle that is suitable for the thread.
1/
Use the correct type
of
needle.
/
B737MK
ID
(English)
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