12. TROUBLESHOOTING
77
BAS-311H
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 these operations.
The machine may operate if the foot switch is depressed by mistake, which could result in injury.
Problem Cause Remedy
Reference
Check if the machine head switch cord
is disconnected.
P. 11
Adjust the position of the machine head
switch.
P. 9
P. 57
Sewing machine does
not start 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.
Air cock is closed. Open the air cock. P. 68
Air pressure is too weak.
Adjust the regulator so that the air
pressure is about 0.5 MPa.
P. 68
Work clamp does not
work.・Work clamp
* Pneumatic work clamp
specifications only
Speed controller has been tightened
too far.
Adjust the speed controller by
loosening it 4 turns from the
fully-tightened position.
P. 18
Thread wiper does not
work.
Thread wiper setting is OFF. Set the thread wiper setting to ON. P. 32
Work clamp arm lever position is
incorrect.
*Pneumatic work clamp specifications
Adjust the position of the work clamp
arm lever.
P. 68
Work clamp does not
rise to the maximum
height.
Work clamp arm assembly stopper
position is incorrect.
*Motor-driven work clamp
specifications
Adjust the position of the work clamp
arm assembly stopper.
Work clamp pressure is
too weak.
* Pneumatic work clamp
specifications only
Air pressure is too weak.
Adjust the regulator so that the air
pressure is about 0.5 MPa.
P. 68
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. 65
The thread wiper is obstructing the
needle.
Adjust the operating stroke of the
thread wiper.
P. 65
Thread wiper does not
operate correctly.
Thread wiper position is incorrect.
Adjust the operating stroke of the
thread wiper.
P. 65
(Continued on next page)
