Troubleshooting - Brother BAS-341F Instruction Manual

15. TROUBLESHOOTING

Problem
Presser does not rise.
Presser does not drop.
Presser lift amount is
incorrect.
Solenoid-type work clamp
lifts up without clamping
the material.
Thread wiper does not
operate correctly.
Lower thread winds to
one side.
Lower thread winding
amount is incorrect.
Thread slips out of the
needle.
Cause
Work clamp operation
is sluggish.
Presser lifter air tube is
bent or damaged.
Work clamp operation
is sluggish.
Presser lifter air tube is
bent or damaged.
Incorrect position of
presser arm lever F.
Work clamp pressure is
too light.
The thread wiper is
obstructing the needle.
Thread wiper position is
incorrect.
Bobbin winder thread
tension stud heights is
incorrect.
Bobbin presser position
is incorrect.
Stitches being skipped
at the sewing start.
Uneven upper thread
length.
Position of shuttle race
thread guide is incorrect
Check
Sliding part of the work
clamp lubrication
Presser lifter air tube
Sliding part of the work
clamp lubrication
Presser lifter air tube
Distance between work clamp
and top of needle plate
Check the setting of the
memory switch (memo-35).
Clearance between thread
wiper and needle tip
Thread wiper position
Bobbin winder thread
tension stud height
Thread winding amount
Refer to "Skipped
stitches occur".
Upper thread length
Position of shuttle race
thread guide
BAS-341F, 342F
15. TROUBLESHOOTING
Remedy
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.
Adjust the work clamp lift
amount.
Increase the setting value
of the memory switch
(memo-35).
Adjust the height of the
thread wiper.
Adjust the operating distance
of the thread wiper.
Adjust the height of the
thread tension stud.
Adjust the position of the
bobbin presser.
Refer to "Skipped
stitches occur".
Adjust the sub-tension.
Adjust the position of the
shuttle race thread guide
Page
37
49
38
38
11
11
13
33
54