Brother BAS-326F-0, BAS-311F-L, BAS-311F-0 instruction manual Troubleshooting

14. TROUBLESHOOTING

14. TROUBLESHOOTING

Problem Cause Check

Remedy

Page

Presser does not rise.

Work clamp operation is sluggish.

Presser lifter air tube is bent or damaged.*

Presser lifter link is not moving back.

Sliding part of the work clamp lubrication

Pressure lifter air tube

Link return spring is unhooked.

Grease the sliding part of
the work clamp.
Straighten the bend in the	18
tube or replace the tube.
Hook the link return
spring properly.

Presser does not drop.

Work clamp operation	Sliding part of the work
is sluggish.	clamp lubrication
Presser lifter air tube is	Presser lifter air tube
bent or damaged.*

Grease the sliding part of
the work clamp.
Straighten the bend in the	18
tube or replace the tube.

Presser lift amount is incorrect.

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

Thread wiper does not operate correctly.

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.

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

Adjust the work clamp lift	49
amount.

Increase	the setting	value	62
of the	memory	switch
(memo-35).
Adjust the height of the			48
thread wiper.
Adjust the operating distance			48
of the thread wiper.

Lower thread winds to one side.

Lower thread winding amount is incorrect.

Bobbin winder thread tension stud heights is incorrect.

Bobbin presser position is incorrect.

Bobbin winder thread	Adjust the height of the	23
tension stud height	thread tension stud.
Thread winding amount	Adjust the position of the	23
	bobbin presser.

Thread slips out of the needle.

*.........For Air type

Stitches being skipped at the sewing start.

Uneven upper thread length.

Position of shuttle race thread guide is incorrect

Refer to “Skipped stitches occur”.

Upper thread length

Position of shuttle race thread guide

Refer to “Skipped stitches occur”.

Adjust the sub-tension.	25
Adjust the position of the	43
shuttle race thread guide

68 BAS-311F-0, 311F-L, 326F-0