Fault Diagnosis Of Major Parts - Samsung AQ07A1VE 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 8 ~27 at ambient temperature (+0°C ~ +30°C)
K Ω K Ω
Abnormal , O ... open or short
∞ Ω
Measure resistance between terminals (CN72) with a tester
Normal At ambient temperature (10°C ~ 30°C)
between
Red, Yellow
Red, Blue
Abnormal , O ... open or short
∞ Ω
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, White
Black, Red
Abnormal , O ... open or short
∞ Ω
Measure resistance between red wire and each terminal.
Normal Approx. 380 at ambient temperature (20°C ~30°C)
Ω
Abnormal , O ... open or short
∞ Ω
Diagnosis
Resistance
190 ± 10
Ω
170 ± 10
Ω
Voltage
05V~4.5V
5V
Resistance
350 ± 10
Ω
270 ± 10
Ω
5-9