Samsung MC18AC2-09 - Fault Diagnosis of Major Parts

5-9Samsung Electronics
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
Abnormal ∞, OΩ … open or short
Measure resistance between terminals (CN72) with a tester
Normal At ambient temperature (10°C ~ 30°C)
Abnormal ∞, OΩ … open or short
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 ∞, OΩ … open or short
Measure resistance between red wire and each terminal.
Normal Approx. 300Ω at ambient temperature (20°C ~30°C)
Abnormal ∞, OΩ … 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[
K
Ω]
between Voltage
Gray, Orange 0.5V~4.5V
Yellow, Orange 5V
Between
Newmotech Wellng Jingjiang Tianma
PFS022WTVA RPG21C YFNPG22-4
Blue, Yellow Main 410Ω ±10% 350Ω ±10% 370Ω ±10%
Blue, Red Sub 325Ω ±10% 270Ω ±10% 300Ω ±10%
Out Power 15W
Between
Newmotech Wellng SUNGSHIN
ASS020WTVA YDK25-6W IC-9625SLC7C
Blue, Yellow Main 270Ω ±10% 275Ω ±10% 250Ω ±10%
Blue, Red Sub 350Ω ±10% 340Ω ±10% 340Ω ±10%
Out Power 25W
DB98_06187A(2)_1 2/19/03 2:50 PM Page 4-7