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14. TROUBLESHOOTING
BAS-311F-0, 311F-L, 326F-0
71
Problem Cause Check Remedy Page
Unstable needle up
stop position
Electrical trouble
Refer to the details fo
r
[E.22] in the error code
table.
Improper tension and heigh
t
of thread take-up spring
Thread take-up spring
tension and height
Improper adjustment o
f
sub tension
sub tension
A
djust the tension and
height of the thread take-
up spring.
Adjust the sub tension.
25
63
Head position switch
cord connection.
Machine does not operated
when power is turned on
and foot switch is depressed.
Head position switch
does not work.
Switching plate position.
Head position switch is
broken.
Check if the cord is
disconnected.
11 13
Adjust the position of the
switching plate.
7
Replace the head
position switch.
Needle up stop position
fluctuates.
See “Unstable needle
up stop position”.
Fixed knife is blunt. Fixed knife blade
Sharpen or replace the
fixed knife.
Unstable upper thread
length