Jacobsen LF 3800, Parts And Maintenance Manual

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TROUBLESHOOTING 5
GB-27
5.3 ELECTRICAL CIRCUITS ____________________________________________________
When troubleshooting the machine using the controller
always check that Program Active lamps (1, 2 and 3 - 5
Gang)(2 and 3 - 7 Gang) are on. These indicate that the
controller has power and the program is active.
Note: 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 tractor.
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.