Electrical Circuits - Jacobsen 67971 – LF 3400 Parts & Maintenance Manual

TROUBLESHOOTING 5
5.3

ELECTRICAL CIRCUITS ____________________________________________________

When troubleshooting the machine using the controller
always check that Program Active lamp (1) is on. These
indicate that the controller has power and the program is
active.
NOTICE
The controller requires a minimum of six volts to operate.
Individual circuits can be tested by operating an input switch,
checking for the required input signal, and looking for a
corresponding output. Keep in mind that not all switches are
located on the instrument panel. The traction pedal, reel lift
limit, and brakes are controlled by small reed switches
mounted on the frame of the mower.
If an input lamp does not light an inactive condition is
indicated. This could be caused by a fuse, faulty switch, or
poor connection.
The electrical connections to the solenoids on the hydraulic
valves are also equipped with small indicator lamps. When
lit these lamps indicate that the output signal has reached
the connection. If lamps do not come on, check wires to and
from connector.
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