LG Multi-Inverter Service Manual page 89

4. Trouble Shooting
Check Point
1. Check the CN_(L),CN_(N) Connection condition at the Inverter PCB.(Refer to outdoor wiring diagram)
2. Check the DC Link voltage at not operating(280V¡è )
3. Check the DC Link voltage at Comp operating(340V¡è )
4. Check DC Link Sensing Signal : 2.4~2.8V (Refer the Picture)
< Input Power Source Check Point >
27/30/40k
Vdc
< Main PCB>
Vdc
<DC_LINK Sensing Check Point>
<DC Link Voltage Check Point>
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