10. TROUBLESHOOTING; Problem Cause ; Remedy - Page 148

10. TROUBLESHOOTING 

BAS-311G, BAS-326G 

141

10. 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.

Problem Cause 

Remedy 

Reference

Work clamp moves stiffly. 

Apply a suitable amount of grease to the 
sliding parts of the work clamp. 

Work clamp does not 
lift. 

Air tube of presser lifter cylinder is bent 
or damaged (Pneumatic specifications). 

Straighten the bend in the tube or 
replace the tube. 

Work clamp moves stiffly. 

Apply a suitable amount of grease to the 
sliding parts of the work clamp. 

Work clamp does not 
drop. 

Air tube of presser lifter cylinder is bent 
or damaged (Pneumatic specifications). 

Straighten the bend in the tube or 
replace the tube. 

Work clamp lift amount setting at 
operation panel is incorrect (Solenoid 
specifications). 

Change the work clamp lift amount 
setting. 

Instruction 

manual

Work clamp lift amount 
is incorrect. 

Work clamp arm lever position is 
incorrect. (Pneumatic specifications) 

Adjust the position of the work clamp 
arm lever. 

P. 100 

Work clamp arm stopper position is 
incorrect (Solenoid specifications). 

Adjust the position of the stopper. 

P. 85 

Work clamp does not 
lift to the maximum 
height. 

Cylinder joint position is incorrect. 
(Pneumatic specifications) 

Adjust the position of the cylinder joint. 

P. 85 

Adjust the height of the thread wiper. 

P. 97 

The thread wiper is obstructing the 
needle. 

Adjust the stroke of the thread wiper. 

P. 97 

Thread wiper does 
not operate correctly. 

Thread wiper position is incorrect. 

Adjust the stroke of the thread wiper. 

P. 97 

Lower thread winds 
to one side. 

Bobbin winder tension assembly height 
is incorrect. 

Adjust the height of the bobbin winder 
tension assembly. 

Instruction 

manual

Lower thread winding 
amount is incorrect. 

Bobbin presser position is incorrect. 

Adjust the position of the bobbin presser.

Instruction 

manual

Stitches being skipped at the sewing 
start. 

Refer to "Skipped stitches occur". 

P. 142 

Upper thread length is irregular. 

Adjust the sub-tension. 

Instruction 

manual

Thread slips out of 
the needle. 

Position of shuttle race thread guide is 
incorrect 

Adjust the position of the shuttle race 
thread guide. 

P. 92