8. ELECTRICAL MECHANISM - Page 138

8. ELECTRICAL MECHANISM 

131

BAS-311G, BAS-326G

Problem  #12  Work clamp does not drop. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1. Incorrect work clamp home 

position adjustment 

1)  Adjust the home position while referring to 

“7-20. Adjusting the home position”. 

2)  Check if the thread wiper or work clamp are 

touching something else. 

2.  Incorrect mechanism adjustment 

Check if the movement of the work clamp arm is 
stiff. 

Work clamp arm assembly 

Problem    #13    TEST indicator does not illuminate when the TEST key is pressed. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1.  Malfunction of panel P.C. board 
 

Check that connector P1 (PANEL) is inserted 
into the main P.C. board, and that connector 
CN2 (MAIN) is inserted into the panel P.C. 
board. 

Panel P.C. board 
Panel harness 

2.  Malfunction of main P.C. board 

Replace the main P.C. board. 

Main P.C. board 

Problem    #14    The feed mechanism does not move one stitch at a time during test feed. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1. Malfunction of foot switch or 

cord 

Refer to inspection #5. 

2.  Incorrect memory switch setting 

1)  Set memory switch No. 200 to OFF. 
2)  Set memory switch No. 252 to OFF. 

Problem    #15    Feed mechanism does not move fast during test feed. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

Malfunction of foot switch or cord 

Refer to inspection #5. 

Problem    #16    Feed mechanism does not follow program during test feed. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

Malfunction of foot switch or cord 

Refer to inspection #5. 

Problem    #17    Intermittent presser foot does not drop during sewing. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1. If the presser foot does not 

operate and [E300] is displayed, 
there is a blown fuse. 

Remove fuse F2 from the power supply motor 
P.C. board and check the continuity. 
OK if continuity 
(If there is no continuity, carry out the inspections 
in 2.) 

Fuse 
6A-250V