8. ELECTRICAL MECHANISM - Page 141

8. ELECTRICAL MECHANISM 

134

BAS-311G, BAS-326G

Problem    #19    An error code is displayed after the sewing machine operates. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1. If [E120], [E121] or [E130] is 

displayed after the sewing 
machine operates, there is a 
malfunction of the synchronizer, 
interference is causing operating 
problems, or the sewing 
machine is incorrectly adjusted. 

1) Check that connector P5 (SYNC) is 

connected to the power supply motor P.C. 
board and that the synchronizer is 
connected. 

2)  Check the synchronizer input while referring 

to “2-8. Input checking method”. 
OK if the signal turns on and off. 

3)  Turn the pulley by hand and check that it 

turns smoothly. 

4) Check that connector P17 (M_MOTOR) is 

connected to the main P.C. board and that 
connector P6 (MAIN) is connected to the 
power supply motor P.C. board. 

5)  Check the harness between connector P17 

(M_MOTOR) of the main P.C. board and 
connector P6 (MAIN) of the power supply 
motor P.C. board. 

6)  Check that the ground wire is connected to a 

secure ground and that there is no equipment 
nearby that is generating strong electrical 
interference. 

7) If [E121] is displayed when the sewing 

machine stops: 

•

 Check if the thread trimming solenoid is 

operating. 

•

  Adjust the thread trimming mechanism. 

Motor assembly CCD-430D 

2.  If [E150] is displayed after the 

sewing machine operates, the 
motor is abnormally overheating. 

1) Turn off the power and let the sewing 

machine stand for 30 minutes. 

2)  Turn the power back on; OK if operation is 

normal. 

3)  If the area around the motor is not hot, carry 

out the steps for [E121]. 

 
Avoid repeated sewing of sewing data that is 
less than 15 stitches. 

Problem  #20  Sewing is incorrect. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1.  Malfunction of synchronizer 
 

Refer to inspection #19. 

2.  If uneven seams occur, there is 

a malfunction of the pulse motor 
or the mechanism is incorrectly 
adjusted. 

1)  Refer to inspection #7-3. 
2)  If uneven seams are occurring because the 

work clamp pressure is too weak, adjust the 
work clamp lift amount while referring to 
“7-14. Adjusting the work clamp lift amount”. 

3)  If there is play in the feed mechanism, adjust 

the feed mechanism.