Samsung AQ12A5(6)MB, Service Manual

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Samsung Electronics
5-9
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
∞
, 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
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
]
**A7(A8)** **A5(A6)**
between Resistance
Black, Red 304±10% 360±10% Main
Black, White 289±10% 257±10% Sub
between Voltage
Gray, Orange 0.5V~4.5V
Yellow, Orange 5V
between Voltage
Red, Blue 410±10% Main
Red, Yellow 325±10% Sub
00181_TSHOO_9 11/6/00 5:17 PM Page 5-9