15. TROUBLESHOOTING- Page 64

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

Adjust 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.

Adjust the tension of the
V belt using the tension
pulley

5

50

Unstable needle up
stop position