Samsung MH18ZC1(C2)-09 - Fault Diagnosis of Major Parts

Samsung Electronics5-18
5-6 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
KΩ~27KΩ at ambient temperature (+0˚C ~ +30˚C)
Abnormal ∞, O Ω … open or short
Measure resistance between terminals (CN73) with a tester
Normal At ambient temperature (10˚C ~ 30˚C)
Abnormal
Measure the voltage between ground and signal wire of the fan motor (CN43)
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
between Resistance
Red, Yellow 190±10Ω
Red, Blue 170
±
10Ω
between Voltage
Gray, Orange 05V~4.5V
Yellow, Orange 5V
between Resistance Remark
Red, Yellow 143±10Ω Low
Blue, Red 58±10Ω High
DB98_08726A(1)<SM_1 12/19/11 4:35 PM Page 5-18