8. ELECTRICAL MECHANISM - Page 134

8. ELECTRICAL MECHANISM 

127

BAS-311G, BAS-326G

Problem  #4  Panel keys do not work. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

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 

Problem    #5    The work clamp does not return to the home position when the foot switch is depressed. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

1.  Malfunction of treadle unit 
 

With connector P6 (FOOT) inserted into the main 
P.C. board, turn on the power and then measure 
the voltages between pins 2-3 at the cord-side 
connector. (No. 2 +, No. 3 

−

) 

 
OK if the voltage is approximately 2 V at neutral 
and approximately 4 V when the foot switch is 
depressed as far as it will go. 
 
 
 
 
 
 
 
 

Treadle unit 

2. Malfunction of two-pedal foot 

switch  

Disconnect connector P6 (FOOT) from the main 
P.C. board, and check the continuity between 
pins 5-6, 7-8 and 8-9 at the cord-side connector. 
 
OK if normally

 ∞ Ω

, and 0 

Ω

 when the foot switch 

is depressed. 
 
 
 
 
 
 
 
 
 
 

Foot switch 
Foot switch cord assembly 

Problem  #6  Home position is incorrect. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

Incorrect home position adjustment 

Switch  to home position adjustment mode, and 
adjust the position of the home position dog. 
(Refer to “7-20. Adjusting the home position”.) 

5086Q 

5087Q 

Work clamp

(Second

position)

Work 

clamp 

Start