This is advanced skilled technical work in the inspection, repair and maintenance of rail vehicle electronic equipment.

Employees in this class are responsible for inspecting, diagnosing, testing and repairing various electronic systems, sub-systems and components used in rail vehicles in a public transportation system. Work involves the advanced application of the principles and techniques of electronic repair to rail vehicle electronic equipment and related test units including automatic train operation equipment. Employees exercise some independent judgment in the various technical phases of repair, diagnosis and testing. Supervision is received from a technical superior who reviews work in progress and upon completion for satisfactory performance of equipment installed, repaired or maintained.

ILLUSTRATIVE TASKS

Follows written procedures and inspects, troubleshoots, diagnoses and repairs various electronic systems, sub-systems and components used in rail vehicles.

Conducts preventive maintenance inspections and maintains heavy rail car electrical/electronic onboard equipment including the control logic for the propulsion and automatic train operation systems, high voltage converter, motor control boxes, semi-conductor boxes, traction motors, electrical/pneumatic couplers, HVAC systems, front end circuits and trainline circuits.

Uses test equipment to perform preventive maintenance including multimeters, ammeters, oscilloscopes, power supplies, pressure transducers, chart recorders, dial indicators, refrigeration test gauges, vacuum pumps, door testers, motor control box testers, converter testers, ATO simulators, and propulsion logic simulators.

Troubleshoots and repairs electrical and electronic onboard propulsion systems equipment including the propulsion system logic (CPU), automatic train operation equipment (ATO logic), semi-conductor box, motor control box, line switch box, control circuits for the propulsion system, controls for electrical rectification, HVAC control circuits, trainline circuits, electro/pneumatic couplers, door controls, HVAC equipment and front end controls.

Reads and interprets schematic diagrams, wiring diagrams and rail vehicle electronic operation manuals.

Evaluates equipment malfunction reports.

Monitors mainline for service disruptions; works under the guidance of Central Control during revenue service hours to resolve service disruptions or equipment malfunctions.

Reports all system faults and any repeat failures to supervisor; responds to emergencies caused by electronic systems breakdowns.

Performs minor servicing to traction motors; dismantles and services DC motors; inspects and cleans; changes bearings, seals, brushes and brush holders; tests repaired motors prior to returning to service.

Rebuilds electrical and electronic components such as line switches, field controllers, power/brake controllers, electro/pneumatic couplers, thyristers and power diodes.

Participates in training programs and instructs employees in electric/electronic repairs.

Observes established safety practices and procedures applicable to the electronic trade and to work in a public transportation system.

Performs related work as required.

KNOWLEDGES, ABILITIES, AND SKILLS

Considerable knowledge of the priniciples and theories of electronics as applied to rail vehicle electronic equipment.

Considerable knowledge of functions of electronic/electrical systems, subsystems, components and printed circuit boards used in rail vehicles.

Considerable knowledge of the standard practices, methods, tools and materials of the electronic trade.

Considerable knowledge of the occupational hazards and safety precautions of the electronic trade.

Knowledge of precision test equipment such as multimeters, ammeters and oscilloscopes.

Ability to diagnose, repair or replace defective electronic equipment used in rail vehicles.

Ability to read and understand schematic diagrams, wiring diagrams and rail vehicle electronic operation manuals.

Ability to work various shifts.

Ability to follow verbal and written instructions.

Ability to use electronic diagnostic testing devices.

Ability to keep accurate records and prepare reports.

Skill in the inspection, diagnosis and repair of electronic malfunctions.

REV 9-94