REV CSection 4 • Repair ProceduresJune 2005Part No. 52075 TMZ-34/19 4 - 215-1Ground Control KeypadCircuit BoardThe ground control keypad circuit board controlsthe machine functions from the ground. Theground control circuit board is connected to theCPU circuit board via a ribbon cable.TMZ-34 models manufactured in the 1998 and1999 model years (from serial number T3498-001to T3499-769) were originally equipped withground controls boxes containing three printedcircuit boards. Machine functions are activatedusing push buttons on the exterior of the box.Beginning with the 2000 model year (from serialnumber T3400-001 to date), the ground control boxwas changed to a two-board configuration. Thepush buttons used to activate machine functionson earlier models were replaced with a membraneoverlay decal, mounted on the exterior of the box.The following procedure will notapply for models manufactured inthe 2000 and later model years.How to Remove the GroundControl Keypad Circuit Board1 Disconnect the battery pack from the machine.Electrocution hazard. Contact withelectrically charged circuits couldresult in death or serious injury.Remove all rings, watches andother jewelry.GROUND CONTROLS2 Remove the four lid retaining fasteners from theground control box. Open the lid.3 Tag and disconnect the ribbon cables from theground control circuit board.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.4 Remove the circuit board mounting fastenersand remove the circuit board from the groundcontrol box lid.Component damage hazard. Besure not to pinch the wires orribbon cable when installing the lidonto the ground control box.800-610-4101ActionRental.com
