[ 3 ] Malfunction- Page 209

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[ 3 ]  Malfunction 

When taking countermeasures for malfunctions as described in this section, check connectors for  
contact failure before measuring the voltage at the specified connector pins. 

M-1 

No AC power supplied 

Possible cause 

Step 

Check 

Result

Remedy 

Supply 
voltage 

1 

Is the correct voltage 
present at the outlet? 

No 

Inform the user that the correct 
voltage is not supplied at the 
outlet. 

Power plug 

2 

Is the power cord securely 
plugged into the outlet? 

No 

Plug the power cord securely 
into the outlet. 

Fuse (F1, F2) 

3 

Is the fuse blown? 

Yes  If the fuse blows again 

immediately after replacing the 
low-voltage power supply PCB, 
check that there is not a short 
circuit somewhere in the AC 
power supply line. 

Wiring 

4 

Unplug the power supply 
plug.  Is there a broken 
wire between the AC input 
connector of the low-
voltage power supply and 
the power plug? 

Yes  Replace the AC power cord. 

M-2 

No DC power supplied 

Possible cause 

Step 

Check 

Result

Remedy 

AC power 
supply 

1 

Is AC power supplied 
between connectors CN1-L 
and CN1-N when the 
power plug is plugged into 
the outlet? 

No 

Follow the same check 
procedure of M-1 “No AC 
power supplied”. 

Wiring, DC 
load 

2 

Turn on the power switch.  
Measure the voltages 
between the terminals.  Do 
the measured voltage 
satisfy the prescribed 
valued in the table below? 

Yes  Turn off the power switch, 

reconnect the connector and 
turn the power switch on again.  
If the protector circuit is 
activated, check the connector, 
the wiring from the connector, 
and the DC load. 

Low-voltage 
power supply 
PCB 

3 

Refer to the chart * 1 
below. 

No 

Replace the low-voltage power 
supply PCB. 

*1 

PCB 

+lead pin 

- lead pin 

Voltage 

Main CN12-6 

CN12-8 

CN12-9 
CN12-9 

Approx. 24V 

Approx. 5V