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3.
TROUBLESHOOTING OF MALFUNCTIONS
When carrying out the countermeasures for malfunctions described in this section, make sure to
check connectors for contact failure before measuring the voltage at specified connector pins.
M-1
No AC power supplied
Possible cause
Step
Supply voltage
1
Power plug
2
Fuse (F1)
3
Wiring
5
M-2
No DC power supplied
Possible cause
Step
AC power supply
1
Wiring,
2
DC load
Power supply
input unit
Check
Is the correct voltage present at the outlet?
Is the power cord securely plugged into the
outlet?
Is the fuse blown?
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?
Check
Is AC power supplied between connectors
CN1-L and CN1-N when the power plug is
plugged into the outlet?
Turn the power switch OFF and disconnect
the P2 connector (driver PCB).
Turn the micro switch on the power supply
PCB ON and measure the voltages between
the terminals.
Do the measured voltage satisfy the
prescribed value in the table below?
PCB
+ lead pin - lead pin
Driver
P2-1
P2-4
P2-3
P2-5
P2-8
P2-6
P2-10
P2-6
Result
No
No
Yes
Yes
Result
No
Yes
Voltage
Approx. 24 V
Approx. 24 V
No
Approx. 5 V
Approx. 5 V
IV - 12
Remedy
Inform the user that the correct
voltage is not supplied at the
outlet.
Plug the power cord securely
into the outlet.
If the fuse blows again im-
mediately after replacing the
fuse or plugging in the power
cord, check if there is a short
circuit somewhere in the AC
power supply line.
Replace the AC power cord.
Remedy
Follow the same check
procedure of M-1 "No AC
power supplied".
Turn the power switch OFF,
connect the connector
disconnected, 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.
Replace the power supply
input unit.
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Table of Contents
Troubleshooting
