This training module on the troubleshooting of an electromechanical system, The Westinghouse Programmable Logic Controller (PLC) controlling a pneumatic robot, is used for a troubleshooting unit in an electromechanical systems/robotics and automation systems course. In this unit, students locate and repair a defect in a PLC-operated machine. The module contains a description, objective, content outline, student activities, methodology, and nine resources. The content outline contains the following units: safety procedures; determining normal system operation; determining point of system failure; analyze data; use PLC override to confirm determination; did something occur to change drum data; repair; verification of repair; and troubleshooting report. There are eight student activities: take pretest; read chapter; read a section in the equipment manual; attend lecture/demonstration; perform laboratory exercises using supplied worksheet; complete report; take posttest; and complete evaluation. The following materials are provided: student packet, student worksheet evaluation for exercise, and eight pages of machine-specific reference data useful in troubleshooting the system. (NLA)