Samsung AQV18UGAX Service Manual

Also see for AQV18PSBN: Service manual User & installation manual Service manual Service manual

12-2612-3-1 Pre-inspection Notices1. Check if you pulled out the AC power plug when you eliminate the PCB or front panel2. Don't hold the PCB side not impose excessive force on it to eliminate the PCB3. Don’t pull the lead wire but hold the whole housing to connect or disconnect a connector to the PCB4. In case of outdoor PCB disassembly, check first the complete discharge of condenser after 1 minute power off12-3-2 Inspection procedure1. Check connector connection and peeling of PCB or bronze coating pattern when you think the PCB is broken2. The PCB is composed of 3 parts● Indoor Main part : MICOM and surrounding circuit, relay, fan motor sensing and driving circuit, temperature sensing circuitpower circuit of SMPS, buzzer circuit. Communication circuit● Display part : LED lamp, Switch, Remote-control module● Outdoor Main part : MICOM and surround circuit, fan motor sensing and driving circuit, compressor driving circuitpower circuit of SMPS, PFC control circuit, 4way circuit, communication circuit,OPTION (EEV control circuit, temperature sensing circuit)12-3-3 Indoor detailed inspection procedureNo procedure Inspection Method Cause1Plug out and pull thePCB out of the controlboxCheck the PCB fuse1) Is 1st fuse disconnected?2) Is 2nd fuse disconnected?. Over current. Indoor Fan motor short. AC part and pattern short of Indoor PBACheck the power voltage1) Is the BD71 input voltage200Vac~240Vac?. Power cord is fault, Fuse open, Wrong Powercable Wiring, AC part is faulty2) Is the voltage between bothterminal of IC02 pin #1-#2 12Vdc? . Switching Trans of Power circuit is faulty3) Is the voltage between bothterminal of IC02 pin #2-#3 5Vdc? . Power circuit is faulty, Load short1) Is the voltage over AC 180V beingimposed on terminal #3-#5 of fan motorconnector (CN72)?. Fan motor of the indoor is faulty2) The fan motor of the indoor unitdoesn't run . Fan motor connector(CN72) is faulty3) The power voltage between terminal#3-#5 of the connector(CN72) is 0V . PBA is faultySupply powerIf the operating lamptwinkles at this time ,the above 1)~3) have norelation23Press the ON/OFF button1. Fan speed(high)2. Continuous Operation