15. TROUBLESHOOTING
BAS-341F, 342F
57
Problem Cause Check Remedy Page
Improper tension and height
of thread take-up spring
Thread take-up spring
tension and height
Improper adjustment of
sub tension sub tension
A
djust the tension and
height of the thread take-
up spring.
Adjust the sub tension.
13
13
Needle up stop position
fluctuates. See “Unstable needle
up stop position”.
Fixed knife is blunt. Fixed k nife blade Sharpen or replace the
fixed knife.
Unstable upper thread
length
Inadequate adjustment
of V belt tension Tension pulley position
Electrical trouble
Refer to the details for [E.
22] in the error code table.
A
djust the tension of the
V belt using the tension
pulley 5
50
Unstable needle up
stop position