8. ELECTRICAL MECHANISM - Page 132

8. ELECTRICAL MECHANISM 

125

BAS-311G, BAS-326G

Problem    #1    The power indicator does not illuminate when the power is turned on. 

Cause

Inspection/Remedy/Adjustment

Replacement if a malfunction

3.  Malfunction of power cord 

Disconnect connector P9 (ACIN) on the power 
supply motor P.C. board from the circuit board, 
turn on the power, and then measure the voltage 
between pins 3-4 of the cord-side connector. 
OK if same as wall outlet voltage 
 
After inspecting, turn off the power and insert 
connector P9. 
 
 
 
 

4. Blown fuse 

Remove  fuses F7 and F8 and check the 
continuity. 
OK if continuity 
(If there is no continuity, replace the fuse and 
then carry out the inspections in 5. ) 

Glass tube fuse 
15A-250V 

5. Malfunction of power supply 

motor P.C. board 

Disconnect connector P17 (M-MOTOR) of the 
main P.C. board, turn on the power, and then 
measure the voltages between the pins at the 
cord-side connector. 
 
OK if the voltages are as shown in the table 
below. 
 
 
 
 
 
 
 
 
After measuring, turn off the power, wait 5 
minutes or more and then insert P14. 
 
 

Power supply motor P.C. 
board 

6.  Malfunction of main P.C. board 

With  connector P17 (M-MOTOR) inserted into 
the main P.C. board, turn on the power and then 
measure the voltages between the pins at the 
cord-side connector. 
 
OK if the voltages are as shown in the table 
below. 
 
 
 
 
 
 
 
 
After measuring, turn off the power. 
 

Main P.C. board 

7.  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 

Pin Nos. 

+ side 

−

side

Normal 
voltage 

1 3 +5V 
2 4 +5V 
6 5 +24V 
7 5 +24V 

Pin Nos. 

+ side 

−

side

Normal 
voltage 

1 3 +5V 
2 4 +5V 
6 5 +24V 
7 5 +24V 

4880Q 

5085Q 

5085Q