Samsung AC009BNLDCH Service Manual page 258

Troubleshooting
When the outdoor unit power is not ON - Initial Diagnosis : 1-phase products (Cont.)
(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
3. Is the power supply voltage 12V?
4. Is there a fault with a fuse of EMI PCB?
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.
4-64
Continue
Check the power parts.
the voltage exceed 290Vdc?
(Short-Normal, Open-Fault)
Yes
Fan Motor connector after
After replacing the main PCB
No
and resetting the power, check
everything is normal.
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.
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