Samsung AC018JN4DCH/AA Service Manual page 65

Check the power parts.
(Switch off power to the terminal
box before inspection!)
1. Is there a fault with a fuse??
(Short-Normal, Open-Fault)
2. When the bridge diode is measured with +, -
(output voltage), does the voltage exceed 290 Vdc?
3. Is the power supply voltage 12V?
4. Is there a fault with a fuse of EMI PBA?
(Short-Normal, Open-Fault)
Fan Motor Connector
After separating and resetting
the power, check everything is normal.
(Separate the connector after turning off the
power of the terminal box!
When detaching and attaching the connector
during power supply,
the motor can be damaged.)
replace the fan motor.
Samsung Electronics
Continued
Outdoor main PBA checking part
Fuse
Yes
Fuse
If it is normal,
Outdoor inverter PBA checking part
Fan Motor
Connector
No
12V power
Bridge Diode
No
(Continued)
After replacing the main PBA and resetting the
power, check everything is normal.
Outdoor EMI PBA checking part
EMI PBA Fuse
Connect the power supply.
(Switch off power to the terminal box!)
1. Connect the power supply.
2. Check whether the power of the outdoor unit
is supplied by powering on the terminal box.
Troubleshooting
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