74TROUBLESHOOTING4-2-8. When alarm sound continuous without stop(related with buzzer sound)StartDoor is ajarStartIs door closedcompletely?Is water penetratedinto the door switch?Is the connector(CN30)inserted correctly?Is manual operation/defrost selected?Does buzzer soundswhen power On again?Is the door switch unitnormal?Is the inputvoltage of main #50 and #3changed at door-open,door-close?˝ If 'ding-dong' sounds continuously˞ If 'beep-beep' sounds continuouslyRemove causes after comprehendingthe conditions of interference by doorgasket, food etc.Replace Door S/WReplace Door S/WMAIN PCB normalCheck if there is any short partsdue to foreign matters and thetest jumper part in the main-PCB.Recheck MAIN PCB anddoor switchSeparate the door switch and check ifthe measured value of unit ischanged from 0ʃ toʃ accordingto switch ON/OFF.* FF Door Switch is magnetic switch .(it can be operated when doormagnet is combined with)Repair wire connection andDoor S/WConnector is not inserted,Repair bad contactEnforce the cancelation themanual operation/ defrost functionor power On after power OffDoor & MICOM StateDoorFMICOM(#50)CloseOpen5V(High)0V(Low)0V(Low)5V(High)R MICOM(#3)Right and Left
