Fault Diagnosis Of Major Parts - Samsung AM18A1(B1)E09 Service Manual

5-4 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
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
Black, Yellow
Black, 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
165 ± 15Ω
Voltage
0.5V~4.5V
5V
Resistance
189±10Ω
190±10Ω
5-9