Samsung AQV12A1ME - 5-4 Fault Diagnosis of Major Parts

5-9
5-4 Fault Diagnosis of Major Parts
(Unit defect)
♦If the comp is locked.
-> Replace the comp.
♦If the comp is operating without the revolution of fan motor
-> Take out the protection cover.
-> Check the fan motor connector and replace the fan motor.
Troubleshooting
Parts
♦ Indoor ”Temp.Sensor”
♦ Indoor “Heat ex. Sensor”
♦ Outdoor ”Temp.Sensor”
♦ Outdoor “Deice Temp. Sensor”
♦ Outdoor “Discharge
Temp.Sensor”
♦ Outdoor “OLP Temp.Sensor”
Indoor Fan Motor
Outdoor Fan Motor
Stepping Motor
(UP/DOWN swing motor)
Diagnosis
Measure resistance with a tester.
Normal
Abnormal ∞, O Ω … open or short
Normal
Abnormal ∞, O Ω … open or short
Measure resistance between terminals (CN72) with a tester
Normal At ambient temperature (10°C ~ 30°C)
Abnormal
Measure the voltage between ground and signal wire of the fan motor
Normal
Abnormal Abnormal if voltage does not change from 0V to 5V.
Normal At ambient temperature (10°C ~ 30°C)
Abnormal ∞, O Ω … open or short
Measure resistance between red wire and each terminal.
Normal Approx. 380Ω at ambient temperature (20°C ~30°C)
Abnormal ∞, O Ω … open or short
Ambient temperature 15°C 20°C 25°C 30°C 35°C 40°C
Resistance of
14.68 12.09 10 8.31 6.94 5.83
thermistor[KΩ]
Ambient temperature 0°C 10°C 20°C 30°C 40°C 50°C
Resistance of
553 362 242 166 165 82
thermistor[KΩ]
between Resistance
Black, Red 275±10% Main
Black, White 350±10% Sub
between Voltage
Gray, Orange 05V~4.5V
Yellow, Orange 5V
between Voltage
Red, Blue 410±10% Main
Red, Yellow 325±10% Sub
Samsung Electronics
MC-Service