I
Problem
Neither
the
upper
nor lower
threads
are being trimmed.
Upper thread is not
t-
being trimmed.
Lower thread is not
being trimmed.
Thread wiper does
not finish wiping the
thread.
Thread wiper is not
wiping the thread.
Reverse feed stitch
length is not identi-
cal
to
normal feed
stitch
length.
~--------P_o_s_s_ib_l_e_c_a_u_se--------~~~
~
____________
R_e_m_e_d_v
____________
~IP_a_g_e~~
---1
-
The fixed
and movable knife blades are
worn.
The needle is installed incorrectly.
Movable knife is not picking up the upper
thread because
of
skipped stitches at the
sewing
end.
Movable
and
fixed knives are blunt.
Upper thread is too long.
There is too much resistance between the
material and the presser foot.
The thread wiper is touching the needle.
Thread wiper is not operating.
Incorrect feed dog
tilt
adjustment.
-46-
:----
Replace
the fixed and movable knives.
38
Install the needle correctly. 20
1--
Adjust the needle down stop position.
36
Replace
the fixed and movable knives.
Adjust the pretension.
Replace with a slotted presser foot.
Adjust the needle up stop position.
Turn on the thread wiper solenoid switch.
-
Adjust the tilt
of
the feed dog.
31
B737MK m (English)
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