77TROUBLESHOOTING4-2-10. If Pantry Panel PCB is not working normallyYou should check the display after door opening because the display of this model operates only whenthe fresh food compartment door is opened.StartDoes fresh foodcompartment door switchoperate normally?Is the connector ofpantry room in fresh foodcompartment insertedcorrectly?Is MAIN PCBConnector (CN78) insertedcorrectly?Is signal of MAINPCB CN78 normal?Is the lightingoperated when replace PantryPanel-PCB?Is a key pressedcontinuously?Is the PCB systemstill operated by separatingof the mechanism?Is the lighting operatedwhen replace PantryPanel-PCB?Is a normal voltageoutputted from MAIN PCB IC74in the key operating?Check and repair the switch* Refer toReinsert Connector,Repair bad contactReinsert connector in MAIN PCBCheck voltage/Replace MAIN PCBPanel PCB itself has trouble.Reassemble PCB ASS'Y /Enforce the cancelation ofpressed keysReassemble PCB ASS'Y /Enforce the cancelation ofpressed keysConvertible compartment PanelPCB itself has trouble.˝ Replace MAIN PCB˞ Check the short of MAINPanel wire˝ Check the wires of Pantry Room - disconnection, short between wires˞ Recheck the control circuit of MAIN PCB Pantry Panel˟ Check the wire assembling between Panel®MAIN˝ Check the wire of Pantry Room - disconnection, shortbetween wires˞ Check the short/open of the pantry panel lightingcircuit in MAIN PCB.˞ If Panel Panel PCB Key is not selectedIf Panel Key is not selected If it is not repaired with using the basic checking method as abovetypical PCB GroundCN1#3(Black)ó Checking method of voltage Based onPCB typical Ground CN1#3(Black)1) Key voltage ; CN78#1"(Purple)2) LED part voltage ; CN78-"7"(Yellow),"8"(Pink) ª Voltage of CN78 is same asIC74 #13,#11 voltage.1) select(operating) (0V) 2) normal(about5.0V 0.5V)- Display On (0.7V0.3V) - Display Off (9.7V1V)
