Section 4 • Repair Procedures4 - 2 S-80 • S-85 • S-80X Part No. 122985February 2012The platform control box contains one printedcircuit board. The ALC-500 circuit board inside theplatform control box controls all proportionalmachine functions from the platform. The joystickcontrollers at the platform controls utilize HallEffect technology and require no adjustment. Theoperating parameters of the joysticks are stored inmemory at the ECM circuit board at the platformcontrols. If a joystick error occurs or if a joystick isreplaced, it will need to be calibrated before thatparticular machine function will operate. See 1-2,How to Calibrate a Joystick.Each joystick controller should operate smoothlyand provide proportional speed control over itsentire range of motion.a ALC-500 circuit boardb drive/steer joystick controllerc primary boom up/down,extend/retract andturntable rotate right/leftjoystick controller1-1ALC-500 Circuit BoardNote: When the ALC-500 circuit board is replaced,the joystick controllers will need to be calibrated.See 1-2,How to Calibrate a Joystick.How to Remove the ALC-500Circuit Board1 Push in the Emergency Stop button to the offposition at both the ground and platformcontrols.2 Remove the platform control box lid retainingfasteners. Open the control box lid.3 Locate the ALC-500 circuit board mounted tothe inside of the platform control box.Electrocution/burn hazard. Contactwith electrically charged circuitscould result in death or seriousinjury. Remove all rings, watchesand other jewelry.4 Attach a grounded wrist strap to the groundscrew inside the platform control box.Component damage hazard.Electrostatic discharge (ESD) candamage printed circuit boardcomponents. Maintain firm contactwith a metal part of the machinethat is grounded at all times whenhandling printed circuit boards ORuse a grounded wrist strap.5 Carefully disconnect the wire connectors fromthe circuit board.6 Remove the ALC-500 circuit board mountingfasteners.7 Carefully remove the ALC-500 circuit board fromthe platform control box.Platform Controlsbca
