15. TROUBLESHOOTING- Page 61

15. TROUBLESHOOTING

BAS-341F, 342F

54

15. TROUBLESHOOTING

Problem

Cause

Check

Remedy

Page

Work clamp operation
is sluggish.

Sliding part of the work
clamp lubrication

Presser lifter air tube is
bent or damaged.

Presser lifter air tube

Presser does not drop.

Work clamp operation
is sluggish.

Sliding part of the work
clamp lubrication

Presser lifter air tube is
bent or damaged.

Presser lifter air tube

Grease the sliding part of
the work clamp.

Straighten the bend in the
tube or replace the tube.

Grease the sliding part of
the work clamp.

Straighten the bend in the
tube or replace the tube.

Presser does not rise.

Incorrect position of
presser arm lever F.

Distance between work clamp
and top of needle plate

Work clamp pressure is
too light.

Check the setting of the
memory switch (memo-35).

The thread wiper is
obstructing the needle.

Clearance between thread
wiper and needle tip

Thread wiper position is
incorrect.

Thread wiper position

Adjust the work clamp lift
amount.

37

Increase the setting value
of the memory switch
(memo-35).

49

Adjust the height of the
thread wiper.

38

Adjust the operating distance
of the thread wiper.

38

Lower thread winds to
one side.

Bobbin winder thread
tension stud heights is
incorrect.

Bobbin winder thread
tension stud height

Lower thread winding
amount is incorrect.

Bobbin presser position
is incorrect.

Thread winding amount

Adjust the height of the
thread tension stud.

11

Adjust the position of the
bobbin presser.

11

Stitches being skipped
at the sewing start.

Refer to “Skipped
stitches occur”.

Thread slips out of the
needle.

Uneven upper thread
length.

Upper thread length

Position of shuttle race
thread guide is incorrect

Position of shuttle race
thread guide

Refer to “Skipped
stitches occur”.

Adjust the sub-tension.

13

Adjust the position of the
shuttle race thread guide

33

Thread wiper does not
operate correctly.

Presser lift amount is
incorrect.

Solenoid-type work clamp
lifts up without clamping
the material.