ELECTRICAL
4181384 First Edition 4-43
4
Backlap Circuit Operation (Model
TR-3)—Theory of Operation
Power Circuit
Unswitched power is available to key switch terminal 30.
When the key switch is turned to the run position, current
flows from the AC terminal of the key switch through
10-amp fuse F10 to control module terminals 3 and 8,
powering up the module. With the control module
powered up, the control module now provides 5 volts to
the mow switch.
Backlap Circuit
Voltage is available from control module 12V fuel shutoff
solenoid output terminal 10 to the backlap switch. (See
“Run Circuit—Theory of Operation” on page 4-33.)
When the backlap switch is in the backlap position,
voltage is provided to control module 12V backlap input,
activating the input.
When the mow switch is in the mow position, voltage is
provided to the control module 5V mow switch input,
activating the input. When the raise/lower switch is
momentarily placed in the lower position, voltage is
provided to the lower input, activating the input. (See
“Raise/Lower Circuit—Theory of Operation” on
page 4-36.)
With the 5V mow switch input activated and 5V lower
switch input momentarily activated, current flows from
12V mow solenoid output terminal 5 to the mow solenoid,
energizing the solenoid.
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