Brother BAS-340 - Page 67

~---P-ro_b_l_e_m ____ ~l ~~-----c_a_u_s_e----~~~ ~ _____ c_h_e_c_k----~~ ~~---s_o_l_u_ti_o_" ____ ~_P_a_ge~
Improper length
Length and
Adjust thread take-
I
_and hardness of
-
hardness of thread
1--
up spring.
thread take-up
take-up spring
:
spring
Tension
at thread
Adjust pre- tension.
1/
- breakage detection
-
Thread escape
Needle
thread
-
length
r-
1/
..... Sub tension
:--
Adjust sub tension .
Improper clearance
Tension
disk
Adjust clearance.
/
~ of tension disk
1----
clearance
1--
.__ Improper
needle
Needle location,
Re-program needle
v
presser foot
and
location
material
location.
Excess
needle Needle
thread
Adjust needle
/
-
thread tension
1--
tension
-
thread tension.
Needle
improperly
Install needle with
v
Needle orientation
longitudinal groove
-
installed
1--
-
facing operator.
Replace thread with
v
Needle thread
Thread too thick for
Thread and needle
break
I-I--
needle
1-- 1--
those matching
needle.
Flaws and burrs on
Needle, needle hole
Polish or replace
I
1--
needle, needle hole
-
plate and shuttle
1--
faulty parts.
plate and shuttle
hook
hook
.____
Heat in thread path
-
Thread end state
1--
Use liquid (silicon)
/
cooling device.
Excess
bobbin Bobbin thread
Adjust bobbin
/
:--
thread tension
-
tension
1--
thread tension.
Bobbin
thread
break
~
I
Flaws or scratches
on edge
of needle
Edge of needle hole
Polish
or replace
.____
-
plate and bobbin
1--
faulty parts.
hole plate or bobbin
case
case
-64-
From the library of: Superior Sewing Machine & Supply LLC