Samsung AC052MN4DKH Service Manual
Also see for AC052MN4DKH: Installation manual
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Contents
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Troubleshooting4-34 Samsung Electronics0VUEPPSVOJU'BOFSSPS &SSPS$PEF& &1. Test items1) Check the connection of Fan connectors (CN90, CN91)2) Check the voltage of the fan motor connector in the inverter PBA of the outdoor unit.3) Check the power connection of the outdoor unit Inverter PCB.4) Check the Fan Motor single parts. (Be sure to turn off the power and separate the motor connector after 30 seconds!)2. Check procedureNoNoYesYesConnect the fan connectors (CN90, CN91 or CN901) correctly. ĺPower on. ĺ After checking normal operation, end the service.Check the power connection of the Inverter PCB of the outdoor unit.1. Check by referring to When the outdoor unit power is not ON -Initial Diagnosis. ĺ Check everything is normal after replacing thePCB at the fault in the Inverter PCB. ĺ End the service.Check the connectionof the fan connectors (CN90, CN91 or CN901).1. Is the outdoor fan connector correctly connected?2. Are the wires of the outdoor fanconnector correctly connected?Check theoutdoor unit Inverter PCB fanconnector voltage ĺ After power ison, check the voltage between connector pins.1. Is the DC_Link voltage correct? (Normal: 280Vdc ≤DC_Link voltage ≤ 360Vdc)2. Is the fan control voltage correct? (Normal: 14Vdc ≤FAN control voltage ≤ 16Vdc)3. Is the fan command voltage?(Normal: 2Vdc ≤FANcommand voltage≤ 5Vdc)Make sure to check after power Off!checking normal operation#1-#3 DC_Link Voltage (between DC_link and GND) 280Vdc ~ 360Vdc#4-#3 DC_Link voltage (between DC15V and GND) 14Vdc ~ 16Vdc#5-#3 FAN command voltage(between fan control and GND) 2Vdc ~ 5VdcNoMeasuring Part Diagnosing Part Value of good productMotor Connector#5(YEL)-#3(BLK) resistance(between fan control andGND)Open (infinite resistance)#4(WHT)-#3(BLK) resistance(between DC15V and GND) Approx. 1.0kΩ ~ 3kΩ#5(YEL)-#3(BLK) resistance(between fan control andGND)Approx. 230kΩ ~ 280kΩ#6(BLU)-#3(BLK) resistance(between feedback andGND)some MΩ or more or open(infinite resistance value)YesCheck thesingle parts of Fan Motor.(Be sure to turn off the power and check after30 seconds!)1. Are the resistance values between pins of the fanmotor connector similar to those in thefollowing table?ఐ At least 30 seconds after power is OFF, attach/detach the fan motor connector! ĺ Threatened to cause secondary damage to the motor and the PCB.ఐ Check the Inverter PCB or Fan Motor single parts and only if there is a fault, replace!ఐ Do not replace the Main PCB of the outdoor unit relating to the fault in the Fan Motor!ĺ If the error is indicated on 7-segment of the Main PCB of the outdoor unit, the Main PCB of the outdoor unit has no fault.ĺ In case of a control problem, it is possible to solve with S/W update. |
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