Samsung AM14A1E07, Service Manual

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Samsung Electronics
5-16
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)
Diagnosis
Measure resistance with a tester.
Normal 8
K
Ω
~27
K
Ω
at ambient temperature (+0°C ~ +30°C)
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. 380
Ω
at ambient temperature (20°C ~30°C)
Abnormal
∞
, O
Ω
… open or short
between Resistance
Red, Yellow 190 ±10
Ω
Red, Blue 170 ±10
Ω
between Voltage
Gray, Orange 0.5V~4.5V
Yellow, Orange 5V
between Resistance
Black, Yellow 189±10
Ω
Black, Red 190±10
Ω