Operator's Manual

Troubleshooting

UsingtheStandardControlModule(SCM)

TheStandardControlModuleisapottedelectronicdeviceproducedinaone-size-ts-allconguration.The

moduleusessolidstateandmechanicalcomponentstomonitorandcontrolstandardelectricalfeatures

requiredforsafeproductoperation.

Themodulemonitorsinputsincludingneutral,parkingbrake,PTO,start,backlap,andhightemperature.The

moduleenergizesoutputsincludingPTO,Starter,andETR(energizetorun)solenoid.

Themoduleisdividedintoinputsandoutputs.InputsandoutputsareidentiedbygreenLEDindicators

mountedontheprintedcircuitboard.

Thestartcircuitinputisenergizedby12VDC.Allotherinputsareenergizedwhenthecircuitisclosedto

ground.EachinputhasaLEDthatisilluminatedwhenthespeciccircuitisenergized.UsetheinputLEDsfor

switchandinputcircuittroubleshooting.

Outputcircuitsareenergizedbyanappropriatesetofinputconditions.The3outputsincludePTO,ETR,and

START .OutputLEDsmonitorrelayconditionindicatingthepresenceofvoltageat1of3specicoutputterminals.

Outputcircuitsdonotdetermineoutputdeviceintegrity,soelectricaltroubleshootingincludesoutputLED

inspectionandconventionaldeviceandwireharnessintegritytesting.Measurethedisconnectedcomponent

impedance,theimpedancethroughwireharness(disconnectatSCM),orbytemporarily”testenergizing”

thespeciccomponent.

TheSCMdoesnotconnecttoanexternalcomputerorhandhelddevice,cannotbere-programmed,anddoes

notrecordintermittentfaulttroubleshootingdata.

ThedecalontheSCMonlyincludessymbols.ThreeLEDoutputsymbolsareshownintheoutputbox.Allother

LEDsareinputs.Thechartbelowidentiesthesymbols.

g190826

Figure79

1.Inputs7.Neutral

2.Backlap

8.PTO

3.Hightemperature

9.Start

4.Inseat10.ETR

5.PTOswitch

11.Power

6.Parkingbrakeoff12.Outputs

HerearethelogicaltroubleshootingstepsfortheSCMdevice.

1.Determinetheoutputfaultyouaretryingtoresolve(PTO,START ,orETR).

2.MovethekeyswitchtotheONpositionandensurethattheredpowerLEDisilluminated.

3.MovealltheinputswitchestoensurethatallLEDschangestate.

4.Positiontheinputdevicesattheappropriatepositiontoachievetheappropriateoutput.Usethefollowing

logiccharttodeterminetheappropriateinputcondition.

5.IfthespecicoutputLEDisilluminatedwithouttheappropriateoutputfunction,checktheoutputharness,

connections,andcomponent.Repairasneeded.

6.IfthespecicoutputLEDisnotilluminated,checkbothfuses.