Samsung SH09BPH - Fault Diagnosis of Major Parts

27Samsung Electronics
6-4 Fault Diagnosis of Major Parts
• 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)
Measure resistance with a tester.
Normal
Abnormal ∞, OΩ … open or short
Normal
Abnormal ∞, OΩ … open or short
Measure the voltage 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 ∞, OΩ … open or short
Measure resistance between red wire and each terminal.
Normal Approx. 290Ω at ambient temperature (20°C ~30°C)
Abnormal ∞, OΩ … open or short
Measure resistance between red wire and each terminal.
Normal Approx. 110Ω at ambient temperature (20°C ~30°C)
Abnormal ∞, OΩ … open or short
DiagnosisPart
Ambient temperature 15°C20°C25°C30°C35°C40°C
Resistance of
14.68 12.09 10 8.31 6.94 5.83
thermistor[KΩ]
Ambient temperature 0°C10°C20°C30°C40°C50°C
Resistance of
553 362 242 166 165 82
thermistor[KΩ]
between Voltage[V]
Red, Blue 410±10% Main
Red, Yellow 325±10% Sub
between Voltage
Gray, Orange 0.5V~4.5V
Yellow, Orange 5V
between Resistance[Ω]
Black, Red 275±10% Main
Black, Yellow 350±10% Sub
DB98_17175A_1 2/6/04 4:14 PM Page 27