Gree GWC18KG-K3DNA6A

66
Troubleshooting
Test point No. Test point Corresponding component Test value under normal
situation
Test 1 Between A and C Neutral wire and live wire 160V-265V
Test 2 Between B and C Neutral wire and live wire 160V-265V
Test 3 Between D and E Electrolytic capacity of DC bus bar 180VDC-380VDC
Test 4 Between F and G Electrolytic capacity of switch power
supply
180VDC-380VDC
Test 5 Two terminal of diode D10 D10 (IPM modular+15V power
supply)
14.5V-15.6VDC
Test 6 Two terminal of flaky capacity C56 C56 (+12V power supply) 12V-13VDC
Test 7 Two terminal of flaky capacity C58 C58 (+5V power supply) 5VDC
Test 8 Two terminal of flaky capacity C83 C83 (+3.3V power supply) 3.3VDC
Test 9 Two terminal of flaky capacity C80 C80 (+17V power supply) 15-18VDC
Test 10 M forward to GND M terminal of R75 forward to ground
(outdoor signal send TXD)
Jump between 0-3.3V
Test 11 N forward to GND N terminal of R78 forward to ground
(outdoor signal send RXD)
Jump between 0-3.3V
Test 12 O Receiving terminal of optical coupling
(audion side)
Jump between 0.3-1.7V
Test 13 P Sending terminal of optical coupling
(LBD side)
Jump between 0-1.1V
Test 14 Q Sending terminal of optical coupling
(LBD side)
Jump between 0-1.1V
Test 15 R Receiving terminal of optical coupling
(audion side)
Jump between 0-24V
Test 16 Between S-T Power supply of communication ring 56VDC