Brother BAS-311H 12. TROUBLESHOOTING, work, Cause, Remedy, height, Problem, too weak, depressed, work.・Work clamp, operate correctly, not start when the, the foot switch is

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.

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	P. 11
Sewing machine does		is disconnected.	P. 11
Sewing machine does
not start when the	Machine head switch does not work.	Adjust the position of the machine head	P. 9
power is turned on and	Machine head switch does not work.	switch.	P. 57
the foot switch is
the foot switch is		If the machine head switch is
depressed.		If the machine head switch is
depressed.		malfunctioning, replace it with a new
		malfunctioning, replace it with a new
		one.
	Air cock is closed.	Open the air cock.	P. 68

Work clamp does not	Air pressure is too weak.	Adjust the regulator so that the air	P. 68
work.・Work clamp	Air pressure is too weak.	pressure is about 0.5 MPa.	P. 68
work.・Work clamp		pressure is about 0.5 MPa.
* Pneumatic work clamp		Adjust the speed controller by
specifications only	Speed controller has been tightened	Adjust the speed controller by	P. 18
	too far.	loosening it 4 turns from the	P. 18
	too far.	fully-tightened position.
		fully-tightened position.

Thread wiper does not	Thread wiper setting is OFF.	Set the thread wiper setting to ON.	P. 32
work.	Thread wiper setting is OFF.	Set the thread wiper setting to ON.	P. 32
work.
	Work clamp arm lever position is	Adjust the position of the work clamp
	incorrect.	Adjust the position of the work clamp	P. 68
	incorrect.	arm lever.	P. 68
Work clamp does not	*Pneumatic work clamp specifications	arm lever.
Work clamp does not	*Pneumatic work clamp specifications
rise to the maximum	Work clamp arm assembly stopper	Adjust the position of the work clamp
height.	position is incorrect.	Adjust the position of the work clamp
	*Motor-driven work clamp	arm assembly stopper.
	specifications
Work clamp pressure is
too weak.	Air pressure is too weak.	Adjust the regulator so that the air	P. 68
* Pneumatic work clamp	Air pressure is too weak.	pressure is about 0.5 MPa.	P. 68
* Pneumatic work clamp		pressure is about 0.5 MPa.
specifications only
Work clamp pressure is	Work clamp is tilted.	Adjust the tilt of the work clamp.
not uniform at front and	Work clamp is tilted.	Adjust the tilt of the work clamp.
back of work clamp.
	The thread wiper is obstructing the	Adjust the height of the thread wiper.	P. 65
	The thread wiper is obstructing the
Thread wiper does not	needle.	Adjust the operating stroke of the	P. 65
operate correctly.		thread wiper.	P. 65
operate correctly.		thread wiper.
	Thread wiper position is incorrect.	Adjust the operating stroke of the	P. 65
	Thread wiper position is incorrect.	thread wiper.	P. 65
		thread wiper.
		(Continued on next page)

BAS-311H