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14. TROUBLESHOOTING
BAS-311F-0, 311F-L, 326F-0
68
14. TROUBLESHOOTING
*.........For Air type
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.*
Pressure lifter air tube
Presser lifter link is no
t
moving back.
Link return spring is
unhooked.
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 o
f
the work clamp.
Straighten the bend in the
tube or replace the tube.
Hook the link return
spring properly.
Grease the sliding part o
f
the work clamp.
Straighten the bend in the
tube or replace the tube.
18
18
Presser does not rise.
Incorrect position of
presser arm lever F.
Distance between work clam
p
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
A
djust the work clamp lif
t
amount.
49
Increase the setting value
of the memory switch
(memo-35).
62
Adjust the height of the
thread wiper.
48
A
djust the operating distance
of the thread wiper.
48
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.
23
Adjust the position of the
bobbin presser.
23
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 incorrec
t
Position of shuttle race
thread guide
Refer to “Skipped
stitches occur”.
Adjust the sub-tension. 25
A
djust the position of the
shuttle race thread guide
43
Thread wiper does no
t
operate correctly.
Presser lift amount is
incorrect.
Solenoid-type work clamp
lifts up without clamping
the material.