Samsung AC071MN4PKH Service Manual page 74

Troubleshooting
When the outdoor unit power is not ON - Initial Diagnosis : 3-phase products (cont.)
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
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.
4-34
power, check everything is normal.