LG CT09F Service Manual page 132

1) Check Voltage Input of AC 220 V, Indoor &
Outdoor Communication
When Input AC 220 V,
- Check AC 220 V Live ↔ Netural, Indoor & Outdoor
- Otherwise, arrange the Communication Wire, Check AC 220 V
Check Voltage Input of AC 220 V
L N C
2) Check electric short Communication Line and Power Line
After Removing Power Line Wire and Communication Line Wire, Check the voltages
- Check resistance Communication ↔ Live should be infinite
- Check resistance Communication ↔ Netural should be infinite
- Check resistance Communication ↔ Gnd should be infinite
C e h k c R s e t s i n a e c o C
Line and Neutral
L N C
IDU
T/B
220
L L
N
C
OK
m m u c i n i t a n o C e h k c R s e
Line and Live
∞
Ω
L N
Equipment : Multi-Meter
Test Mode : AC Voltage
Indoor & Outdoor Terminal block
ODU IDU ODU
T/B T/B T/B
L L L L L L
N N N
C C C
NG
t s i n a e c o C m m u c i n i t a n o
∞
Ω
C
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Part 4 Trouble Shooting
Equipment: Multi-Meter
Test Mode : Resistance