September 2016 Service and Repair ManualGround ControlsPart No. 1268556 696-2Circuit BoardsThe ground control box (TCON) is thecommunication and operations center for themachine. The ground control box contains two keyswitches. The key switch towards the top of thecontrol box is for selection of ground or platformcontrols. The key switch at the bottom of the controlbox is the Service Bypass key switch. It is used tocorrect an out-of-level platform. If the machine tripsan envelope safety switch, the operator at theground controls can turn and hold the ServiceBypass key switch in the recover position, which willautomatically retract the boom and lower theplatform to the ground.The ground control box contains a replaceablemembrane decal with touch sensitive buttons forvarious machine functions. The ground control boxalso contains two printed circuit boards:The LCD (Liquid Crystal Display) circuit board ismounted to the inside of the control box lid whichcontrols the LCD display screen or CAN Gateway ifequipped with a Tier IV engine.The TCON circuit board is the main circuit boardfor the machine. There are relays on the ECMcircuit board that can be replaced. All operatingparameters and configuration of options for themachine are stored in the ECM memory.Note: The ECM circuit board inside the groundcontrol box (TCON) cannot be replaced by itself. Ifthe ECM circuit board is faulty and needs to bereplaced, contact the Genie Industries ServiceDepartment.Note: When an ECM circuit board is replaced, theproportional valves will need to be calibrated. Referto Repair Procedure, How to Calibrate a Joystick.How to Determine the RevisionLevel1 Turn the key switch to ground controls and pullout the red Emergency Stop buttons to the onposition at both platform and ground controls.Result: The revision level of the TCON willappear in the LCD display window.How to Remove the LCD DisplayScreen Circuit Board1 Push in the red Emergency Stop button to theoff position at both the ground and platformcontrols.2 Remove the ground control box lid fasteners.3 Open the ground control box.Electrocution/burn hazard.Contact with electrically chargedcircuits could result in death orserious injury. Remove all rings,watches and other jewelry.Component damage hazard.Electrostatic discharge (ESD)can damage printed circuit boardcomponents. Maintain firmcontact with a metal part of themachine that is grounded at alltimes when handling printedcircuit boards OR use agrounded wrist strap.4 Carefully disconnect the LCD circuit boardribbon cable from the ECM circuit board.5 Remove the LCD display circuit boardretaining fasteners.6 Carefully remove the LCD display circuit boardfrom the ground control box lid.
