Toro Groundsmaster 3500-D Operator's Manual page 29

Each row (across) in the logic chart below identifies input and output requirements for each specific product
function. Product functions are listed in the left column. Symbols identify specific circuit condition, including
energized to voltage, closed to ground, and open to ground.
Function Power In
ON N
EUTRAL
—
Start
—
Run (Off
Unit)
—
Run (On
Unit)
—
Mow
—
Backlap
—
Hi Temp
•
(–) Indicates a circuit closed to ground—LED On
•
(O) Indicates a circuit open to ground or
de-energized—LED Off
To troubleshoot, turn on the key without starting the engine. Identify the specific function that does not work and
work across the logic chart. Inspect the condition of each input LED to ensure that it matches the logic chart.
If the input LEDs are correct, check the output LED. If the output LED illuminates but the device is not energized,
measure the available voltage at the output device, the continuity of the disconnected device, and the potential
voltage on the ground circuit (floating ground).
Inputs
Brake
Start ON
ON
—
+
O
—
O O
—
O O
—
O O
—
O O
O
Hi Temp
PTO ON In Seat
—
O O
O O O
—
O O
— —
O
—
O O
—
•
(+) Indicates an energized circuit (clutch coil,
solenoid, or start input)—LED On
•
A blank indicates a circuit that is not involved with
the logic chart.
29
Outputs
Backlap ETR
Start
+ +
O
+
O O
+
O O
+
O O
—
+
O
O O
PTO
O
O
O
+
+
O