LG Multi-Inverter Service Manual page 78

Check Point
1. Check the power source.(220V ±15%)
2. Check the fan operation is right.
3. Check the current.
4. Check the install condition.
5. Check the CT Sensor Output signal
(27/30/40k - Check output the CT Sensor : DC 2.5±0.2V)
(48/56k - Check output pin 1.2 of the CT Sensor : 5V )
< Input Power Source Check Point >
< Main PCB>
< Inverter PCB>
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Only for training and service purposes
Vdc
<CT Sensing Check Point>
<CT Sensing Check Point>
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4. Trouble Shooting
LGE Internal Use Only