Samsung AC018KN4DCH Service Manual page 77

When the outdoor unit power is not ON - Initial Diagnosis : 1-phase products
Continue
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 290Vdc?
3. Is the power supply voltage 12V?
4. Is there a fault with a fuse of EMI PCB?
(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.)
If it is normal, replace the
Fan Motor.
Yes
No After replacing the main PCB and resetting the power,
Connect the power wire (First turn off the power of the
Terminal Box!)
No
1. Connect the power wire.
2. Turn on the Terminal Box and check whether normal
power is supplied to the outdoor unit.
4-37
Troubleshooting
(cont.)
check everything is normal.