Greensmaster 3150Page 5 -- 22Electrical System
Diodes
Themainwiringh arnesscontainssix(6)diodes.Diodes
D2 and D3 are connected to the harness at separate
locations. Diodes D1--A, D1--B, D1--C and D1--D are
connectedto themain harnessbya four(4) positioncir-
cuit board located near the front of the left side control
panel.Thediodesareusedforcircuitprotectionfromin-
ductive voltage spikes and for safety circuit logic.
Apply dielectric grease (Toro part number 107--0342) to
circuit board contacts whenever the circuit board is
installed into the wire harness.
Diode D1--A
Allowstheenginet o startonlywiththe functionalcontrol
leverinNEUTRAL(neutralswitchclosed).Also,itallows
theenginetocontinuetorunwitheitherthefunctional
control leverin NEUTRAL (neutralswitch closed) orthe
operator sitting in the seat (seat switch closed).
Diode D1--B
Prevents a negative spike from damaging the neutral
switch andseat switch byallowing aground pathfor the
start safety relay (K2) when it de--energizes.
Diode D1--C
Maintainscurrent flowto the joystickrelay(K3) afterthe
momentary lower switch of the joystick opens.
Diode D1--D
Prevents a negative spike from damaging the mow and
backlapswitchesby allowinga groundpathforthemow
relay (K4) when it de--energizes.
Diode D2
ThisdiodepreventscurrentflowtosolenoidS4whenso-
lenoids S2 and S3 are energized through raise relay
(K6).
Diode D3
ThisdiodepreventscurrentflowtosolenoidS3whenso-
lenoids S2 and S4 are energized through lower relay
(K5).
Testing
The diodes can be individually tested using a digital
multimeter (ohms setting) and the table to the right.
Figure 25
DIODE
CIRCUIT
BOARD
PLUG-IN
DIODE
D1--D
D1--C
D1--A
D1--B
1/A 2/B
Figure 26
D1--A
D1--B
D1--C
D1--D
DIODE CIRCUIT BOARD
Type
Red (+) Black (--)
Continuity
Circuit
Board
H A
YES
A H
NO
G B
YES
B G
NO
F C
YES
C F
NO
E D
YES
D E
NO
Plug-In
1/A 2/B
YES
2/B 1/A
NO
Figure 27
DIODE
CIRCUIT BOARD
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