Operator's Manual

ThedecalontheSCMonlyincludessymbols.Three
LEDoutputsymbolsareshownintheoutputbox.All
otherLED’sareinputs.Thechartbelowidentiesthe
symbols.
Figure28
HerearethelogicaltroubleshootingstepsfortheSCM
device.
1.Determinetheoutputfaultyouaretryingtoresolve
(PTO,START,orETR).
2.MovekeyswitchtotheOnpositionandensurethat
theredpowerLEDisilluminated.
3.MoveallinputswitchestoensureallLED’schange
state.
4.Positioninputdevicesatappropriatepositionto
achievetheappropriateoutput.Usethefollowing
logiccharttodeterminetheappropriateinput
condition.
5.IfspecicoutputLEDisilluminatedwithout
appropriateoutputfunction,checkoutputharness,
connections,andcomponent.Repairasrequired.
6.IfspecicoutputLEDisnotilluminated,check
bothfuses.
7.IfspecicoutputLEDisnotilluminatedandinputs
areinappropriatecondition,installnewSCMand
determineiffaultdisappears.
Eachrow(across)inthelogicchartbelowidenties
inputandoutputrequirementsforeachspecicproduct
function.Productfunctionsarelistedintheleft
column.Symbolsidentifyspeciccircuitcondition
including:energizedtovoltage,closedtoground,and
opentoground.
INPUTSOUTPUTS
FunctionPower
ON
In
Neutral
StartON
Brake
ON
PTOONInSeat
HiT empBacklap
Start
ETR
PTO
Start
——
+
OO
—
OO
++
O
Run(Off
Unit)
——
OOOOOOO
+
O
Run(On
Unit)
—
OO
—
O
—
OOO
+
O
Mow
—
OO
———
OOO
++
Backlap
——
OO
—
OO
—
O
++
HiT emp
—
O
—
OOO
•(–)Indicatesacircuitclosedtoground.–LEDON
•(O)Indicatesacircuitopentogroundor
de–energized–LEDOFF
•(+)Indicatesanenergizedcircuit(clutchcoil,
solenoid,orstartinput)LEDON.
•ABlankindicatesacircuitthatisnotinvolvedwith
thelogic.
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