Troubleshooting - Brother BAS-311H Instruction Manual

12. TROUBLESHOOTING

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.
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
Sewing machine does
not start when the
power is turned on and
the foot switch is
depressed.
Work clamp does not
work.・Work clamp
* Pneumatic work clamp
specifications only
Thread wiper does not
work.
Work clamp does not
rise to the maximum
height.
Work clamp pressure is
too weak.
* Pneumatic work clamp
specifications only
Work clamp pressure is
not uniform at front and
back of work clamp.
Thread wiper does not
operate correctly.
75
Cause
Machine head switch does not work.
Air cock is closed.
Air pressure is too weak.
Speed controller has been tightened
too far.
(Other than when using the thread
trimming cylinder)
Thread wiper setting is OFF.
Work clamp arm lever position is
incorrect.
*Pneumatic work clamp specifications
Work clamp arm assembly stopper
position is incorrect.
*Motor-driven work clamp
specifications
Air pressure is too weak.
Work clamp is tilted.
The thread wiper is obstructing the
needle.
Thread wiper position is incorrect.
CAUTION
Check if the machine head switch cord
is disconnected.
Adjust the position of the machine head
switch.
If the machine head switch is
malfunctioning, replace it with a new
one.
Open the air cock.
Adjust the regulator so that the air
pressure is about 0.5 MPa.
Work clamp: Adjust the speed
controller by loosening it 4 turns from
the fully-tightened position.
Set the thread wiper setting to ON.
Adjust the position of the work clamp
arm lever.
Adjust the position of the work clamp
arm assembly stopper.
Adjust the regulator so that the air
pressure is about 0.5 MPa.
Adjust the tilt of the work clamp.
Adjust the height of the thread wiper.
Adjust the operating stroke of the
thread wiper.
Adjust the operating stroke of the
thread wiper.
BAS-311H
Remedy
(Continued on next page)
Reference
P. 11
P. 9
P. 55
P. 66
P. 66
P. 18
P. 32
P. 66
P. 66
P. 63
P. 63
P. 63