White box controller
This controller gives the technician on-board diagnostics as standard equipment, meaning there are no diagnostic tools or plug-ins to purchase separately. No tools are required to access the white box controller. Simply disengage the latch to open up the access panel. This allows the technician to troubleshoot electrical problems while sitting in the operator seat.
The controller has a heartbeat feature to aid the technician in diagnostics. When the LED light in the center of the controller is flashing at a regular rate, it indicates the controller is properly powered up and there are no circuit problems. Each switch or solenoid on the machine has its own LED light on the controller. Input and output functions can be diagnosed by observing the appropriate lights.
When the heartbeat LED light is flashing at an irregular rate, it indicates there is a system fault of some sort. The irregular flashing rate leads the technician to the circuit to start proper diagnostics. These codes can be found on the front of the access panel to the controller. Detailed information is located in the operator's manual and technical manual.