Troubleshooting - Brother BAS-343E Instruction Manual

14. Troubleshooting

14. Troubleshooting
Problem
Auxiliary work clamp
does not rise.
Auxiliary work clamp
does not drop.
Presser lift amount is
incorrect.
Thread wiper does not
operate correctly.
Lower thread winds to
one side.
Lower thread winding
amount is incorrect.
Thread slips out of the
needle.
Cassette is not ejected.
54
Cause
Insufficient air pressure
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.
Interference between
thread wiper and work
The thread wiper is
obstructing the needle.
Thread wiper position
is incorrect.
Bobbin winder thread
tension stud height 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
Cylinder pin is not
working properly.
Sensor is not detecting
the cassette.
Malfunction of foot
switch
Check
Auxiliary work clamp
regulator setting
Presser lifter air tube
Sliding part of the work
clamp lubrication
Presser lifter air tube
Distance between
work clamp and top of
needle plate
Clearance between
thread wiper and work
clamp
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
Turn off the power
and check valve 2
manually.
Check the indicator
lamp status.
BAS-343E
Remedy
Adjust the air pressure.
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.
Adjust the height of the
thread wiper.
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
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