Carrier — Procedure (Steps: 2)

A Carrier service procedure — check it applies to your exact model before use.

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Procedure

1. PREVENTIVE MAINTENANCE a. Periodic Inspections Slow degradation of equipment performance, if left uncorrected, can lead to costly equipment downtime and repair. Preventive maintenance (PM) differs from corrective maintenance in that minor equipment operating deficiencies can be corrected before breakdown occurs. Periodic and systematic PM inspection schedules should be set up to keep the equipment operational and failure free. The frequency of PM schedules will be determined by the environment in which the equipment is being used. .. The periodic inspections should include: Visual inspection of cables for frayed or oxidized leads. Ensuring that battery connections are free from oxidation or corrosion. . Checking the external rooftop antenna for clean and rust-free mounting. Checking for tight connection of the console-to- antenna cable connecto~s. Checking the system ground lead (black) for clean and proper electrical contact. Checking all jack and plug connections for tightness and good electrical pin contact. Pins should be visually checked for wear. Checking for loose components. Checking compqnent assemblies and mechanical assemblies for tight and secure installation. The . majority of MVA failures is directly related to poor installation. Inspecting all mounting brackets and associated mounting screws for secure and tight mounting. Checking for overh-eated or discolored components. Checking for proper (13.8Vdc) vehicular alternator charging. Vehicular voltage can vary from as low as 12.9Vdc to as high as 18Vdc without being evident to the operator; however, it can affect MVA operation. c... b. Cleaning Procedures In areas of high dust or salt conditions, periodically check the mechanical 'operation of the console's battery contacts. If contact "movement requires excessive effort, clean any dust or salt deposits from the moving parts as described below. Cleaning may be accomplished by performing the following procedure: (1) Remove the console from the vehicle and place it rightside-up on a flat working surface. The working surface should offer protection from scratching to the console's surfaces. 10 (2) Referring to the "Disassembly/Reassembly Procedures" (paragraph d) in the "CORRECTIVE MAINTENANCE" section of this manual, disassemble the unit for cleaning. (3) Clean the external surfaces of the console using the recommended cleaning agent. These surfaces should be cleaned whenever a periodic visual inspection reveals the presence of excessive dust, grease, and/or grime. The only recommended agent for cleaning the internal and external plastic MVA surfaces is a
2. CORRECTIVE MAINTENANCE a. Introduction Efficient corrective maintenance requires an orderly and logical troubleshooting procedure for localizing malfunctions in the MVA's internal or external circuits. Troubleshooting and repair will be greatly simplified by becoming familiar with the overall MVA and radio operation. This section provides detailed information required to isolate malfunctions to the MVA's internal or external circuits. The troubleshooting chart at the end of this section provides information on possible circuit failures, related symptoms, and suspected malfunctioning stages. Generally it may be assumed that, if the MVA is totally inoperative, the vehicle's battery is completely discharged, the fuse is blown, or the power lead is opened. However, if the MVA is partially operative, it may be assumed that the batteries are serviceable and that one or more internal or external functional MVA circuits are defective or marginal. Using diagrams, the troubleshooting chart, the voltage table, and deductive creasoning, the qefective circuit may readily be found. To further aid in analyzing the symptoms and , possiblecauses of the malfunction,check: rf power output using an in-Ifne wattmeter, audio deviation, and current drain. Once the general problem area of the MVA is identified, careful use of a dc voltmeter, ohmmeter, and/or oscilloscope should help isolate. the problem to a defective component. b. Test Equipment and Service Aids The "RECOMMENDED TEST EQUIPMENT" chart lists the test equipment recommended to properly service the MVA. Refer to the service' manual for the associated radio for the recommended radio test equipment. For field servicing, jhe vehicle's battery.is an adequate power source. Battery-operated test equipment is recommended when available. RECOMMENDED TEST EQUIPMENT NAME CHARACTERISTICS APPLICATION See your Motorola csalesrepresentative for aid in ordering test equipment. The sales representative will analyze your requirements and help you select the latest available equipment and service aids to suit your individual needs. (1) MAV-PACK3 (VID-952) The VID-952 Motorola Video Visual Package (MAV-PACK) is a video tape training program on leadless

Source: manual:mt1000-mva-instruction-manual.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.