Owner's Manual

12. TROUBLESHOOTING
BAS-300G-484, BAS-300G-484 SF
73
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12. TROUBLESHOOTING
• Please check the following points before calling for repairs or service.
• If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of
purchase.
CAUTION
Turn off the power switch and disconnect the power cord before carrying out troubleshooting.
If the foot switch is depressed by mistake, the sewing machine might start operating and injury could result.
Items with a “*” in the “Reference” column should only be checked by a qualified technician.
Problem Cause Remedy Reference
Check if the machine head switch cord
is disconnected.
P. 12
Adjust the position of the machine head
switch.
P. 8
P. 54
Sewing machine does
not operate when the
power is turned on
and the foot switch is
depressed.
Machine head switch does not work.
If the machine head switch is
malfunctioning, replace it with a new
one.
The air cock is closed. Open the air cock. P. 10
Air pressure is low.
Adjust the regulator so that the air
pressure is about 0.5 MPa.
P. 66
Work clamp:
Adjust the speed controller by loosening
it 4 turns from the fully-tightened
position.
P. 11
Speed controller has been
overtightened. (applicable to other than
thread trimmer cylinder)
Thread wiper and thread take-up lever:
Adjust the speed controller by loosening
it 6 turns from the fully-tightened
position.
P. 11
The following parts
do not work.
・ Work clamp
・ Thread wiper
・ Thread trimmer
cylinder
・ Thread take-up
lever
Thread wiper switch is OFF. Set the thread wiper switch to ON. P. 51
Work clamp does not
lift to the maximum
height.
Work clamp arm lever position is
incorrect.
Adjust the position of the work clamp
arm lever.
P. 66
Work clamp pressure
is weak.
Air pressure is low.
Adjust the regulator so that the air
pressure is about 0.5 MPa.
P. 66
Work clamp pressure
is not uniform at front
and back of work
clamp.
Work clamp is tilted. Adjust the tilt of the work clamp. *
Adjust the height of the thread wiper. P. 63
The thread wiper is obstructing the
needle.
Adjust the stroke of the thread wiper. P. 63
Thread wiper does
not operate correctly.
Thread wiper position is incorrect. Adjust the stroke of the thread wiper.
P. 63