Fault Diagnosis Of Major Parts - Samsung MC18AC2-09 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.
Normal
Ambient temperature
Resistance of
thermistor[
∞, OΩ ... open or short
Abnormal
Measure resistance between terminals (CN72) with a tester
Normal At ambient temperature (10°C ~ 30°C)
Between
Blue, Yellow Main
Blue, Red
Out Power
∞, OΩ ... open or short
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
Blue, Yellow Main
Blue, Red
Out Power
∞, OΩ ... open or short
Abnormal
Measure resistance between red wire and each terminal.
Normal Approx. 300Ω at ambient temperature (20°C ~30°C)
∞, OΩ ... open or short
Abnormal
Diagnosis
15°C 20°C
14.68 12.09
Ω]
K
Newmotech
PFS022WTVA
410Ω ±10%
Sub 325Ω ±10%
Voltage
0.5V~4.5V
5V
Newmotech
ASS020WTVA
270Ω ±10%
Sub 350Ω ±10%
25°C 30°C 35°C 40°C
10 8.31 6.94 5.83
Wellng Jingjiang Tianma
RPG21C YFNPG22-4
350Ω ±10% 370Ω ±10%
270Ω ±10% 300Ω ±10%
15W
Wellng SUNGSHIN
YDK25-6W IC-9625SLC7C
275Ω ±10% 250Ω ±10%
340Ω ±10% 340Ω ±10%
25W
5-9