Brother BAS-340 - Page 69

~---P_r_o_bl_e_m __ --~11 ~-----c_a_u_s_e----~~~ ~-----c-h_e_c_k----~~ ·~~-----so_l_u_ti_o_" ____ ~_P_a_ge~
...... Dull fixed knife
~
Fixed knife edge
1-
Sharpen or replace
1/
fixed knife.
Location
of shuttle
Adjust shuttle race
44
...... race thread guide
1-
thread guide.
Movable
knife
,.._ cannot catch needle ,_
thread.
Complete stitching
v
._ Final stitch direction
-
in forward stitch
Needle
thread
direction
cannot
be cut.
1-
Movable
knife
See "Stitch
,_ cannot catch needle
~
Final stitch
1-
skipping" in
65
thread due to final
stitch skipped.
probl_ em item.
Improper location
Movable
knife
Adjust movable
45
,_ of movable knife
-
location
1-
knife.
Wrong engagement
Engagement
of the Replace movable
- pressure of movable
,__.
movable knife and
1-
knife's washer.
46
knife and fixed
fixed knife
knife
Needle
thread
Needle thread Adjust needle
v
......
tension too weak
1---
tension
1-
thread tension.
Poorly
tightened
Bobbin thread Bobbin
thread Adjust bobbin
v
thread
1-1-
tension too weak
1--
tension
1-
thread tension.
Improper length
Length and Adjust thread take-
v
._and hardness of
f--
hardness of thread
1--
up spring.
thread take-up
spring
take-up spring
Flaws
or burrs
on
Movable knife
Polish
or replace
44 .......---
movable knife
,__.
1-
faulty parts.
Bobbin
thread Excess bobbin
Bobbin thread
Adjust bobbin
v
1-1---
,__. ._____
cut thread tension tension thread tension
Improper bottom Clearance between
Adjust fixed knife
to
45
._____
end position
of
1--
fixed
knife
and
-
provide 0.5 mm
fixed knife needle plate
clearance
between
its tip and needle
plate hole.
-66-
From the library of: Superior Sewing Machine & Supply LLC