8. ELECTRICAL MECHANISM - Page 143

8. ELECTRICAL MECHANISM 

136

BAS-311G, BAS-326G

Problem  #22  Thread wiper does not operate. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1.  Incorrect mechanism adjustment 
 

Adjust the thread wiper while referring to “7-11. 
Adjusting the thread wiper”. 
(If it is clear that the thread wiper mechanism is 
not operating, carry out inspections 2. and 3. 
below.) 

2.  Poor connector contact 

Check that connector P1 (MAIN) is inserted into 
the PMD P.C. board. 

3. Malfunction of thread wiper 

solenoid  

Disconnect connector P6 (SOL1) from the PMD 
P.C. board, and measure the resistance between 
pins 2-5 of the cord-side connector. 
OK if approximately 4 

Ω

Thread wiper solenoid 

4.  Malfunction of PMD P.C. board   

With  connector  P6  (SOL1)  connected  to  the 
PMD P.C. board, turn on the power and carry out 
sewing, and measure the voltage between pins 
2-5 of connector P6 (SOL1). 
OK if voltage is output momentarily at the sewing 
end. 
 
 
 
 
 
 
 
 
 

PMD P.C. board 

Problem    #23    Needle does not stop in the up position ([E110] is displayed.) 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1. Incorrect adjustment 

Adjust while referring to “7-21. Adjusting the 
needle up stop home position” and “7-22. 
Adjusting the needle up stop position”. 

2.  Malfunction of synchronizer 

Refer to inspection #19. 

3.  Malfunction of cord 

Refer to inspection #18. 

4. Malfunction of power supply 

motor P.C. board   

With connector P2 (POWER2) connected to the 

PMD P.C. board, measure the voltage at the cord.

OK if approximately 30 V DC between pins 3-4 
 
 
 
 
 
 
 
 

Power supply motor P.C. 
board 

5.  Malfunction of main P.C. board 

Main P.C. board 

6.  Malfunction of motor 

Motor 

4892Q 

5088Q 

5089Q