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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 knife 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