Fault Diagnosis Of Major Parts - Samsung SH09BPH Service Manual

6-4 Fault Diagnosis of Major Parts

Part
• Indoor "Temp.Sensor"
• Indoor "Heat ex. Sensor"
• Outdoor "Temp.Sensor"
• Outdoor "Deice Temp. Sensor"
• Outdoor "Discharge
Temp.Sensor"
• Outdoor "OLP Temp.Sensor"
Indoor Fan Motor
Outdoor Fan Motor
Stepping Motor
(UP/DOWN swing motor)
Stepping Motor
(FRONT GRILLE motor)
Samsung Electronics
Measure resistance with a tester.
Normal
Ambient temperature
Resistance of
thermistor[KΩ]
∞, OΩ ... open or short
Abnormal
Normal
Ambient temperature
Resistance of
thermistor[KΩ]
∞, OΩ ... open or short
Abnormal
Measure the voltage between terminals (CN72) with a tester
Normal At ambient temperature (10°C ~ 30°C)
between
Red, Blue
Red, Yellow
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
Black, Red
Black, Yellow
∞, OΩ ... open or short
Abnormal
Measure resistance between red wire and each terminal.
Normal Approx. 290Ω at ambient temperature (20°C ~30°C)
∞, OΩ ... open or short
Abnormal
Measure resistance between red wire and each terminal.
Normal Approx. 110Ω at ambient temperature (20°C ~30°C)
∞, OΩ ... open or short
Abnormal
Diagnosis
15°C 20°C 25°C
14.68 12.09 10
0°C 10°C 20°C
553 362 242
Voltage[V]
410±10% Main
325±10% Sub
Voltage
0.5V~4.5V
5V
Resistance[Ω]
275±10% Main
350±10% Sub
30°C 35°C 40°C
8.31 6.94 5.83
30°C 40°C 50°C
166 165 82
27