Fault Diagnosis Of Major Parts - Samsung AD24A1(B1)E12 Service Manual

5-5 Fault Diagnosis of Major Parts

Parts
Temp.Sensor
Heat ex. Sensor
Indoor Fan Motor
Outdoor Fan Motor
Stepping Motor
(UP/DOWN swing motor)
Samsung Electronics
Measure resistance with a tester.
Ω~27 Ω at ambient temperature (+0°C ~ +30°C)
Normal 8
K K
∞, O Ω ... open or short
Abnormal
Measure resistance between terminals (CN73) with a tester
Normal At ambient temperature (10°C ~ 30°C)
between
Red, Yellow
Red, Blue
Abnormal
Measure the voltage between ground and signal wire of the fan motor (CN43)
Normal
between
Gray, Orange
Yellow, Orange
Abnormal Abnormal if voltage does not change from 0V to 5V.
Normal At ambient temperature (10°C ~ 30°C)
between
Red, Yellow
Blue, Red
∞, O Ω ... open or short
Abnormal
Measure resistance between red wire and each terminal.
Normal Approx. 380Ω at ambient temperature (20°C ~30°C)
∞, O Ω ... open or short
Abnormal
Diagnosis
Resistance
190±10Ω
170 ± 10Ω
Voltage
05V~4.5V
5V
Resistance Remark
143±10Ω Low
58±10Ω High
5-15