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24 Cards in this Set
- Front
- Back
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Step 1 |
Symptom recognition |
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Step 2 |
Symptom elaboration |
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Step 3 |
Possible faulty functions |
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Step 4 |
Localizing the faulty function |
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Step 5 |
Localizing the faulty circuit |
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Step 6 |
Failure analysis |
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Identifying the_________is the first step of identifying the________ |
Fault Cause |
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Symptom recognition |
Used to recognize and document a disorder or malfunction within a system |
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Symptom elaboration |
-used to obtain a detailed description of the problem using flow diagrams and other technical documentation -list locations of checks that can be taken for future reference -overlapping problems may give clues to location of fault |
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Possible faulty functions |
-applies to equipment with more than one functional area -technician lists functional areas in which fault could be located |
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Localizing the fault |
-determine which unit within a multi-unit system is at fault -using unit level inputs and outputs -can be unnecessary if all possible faulty functions are in same unit |
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Localizing faulty circuit |
-uses extensive testing to localize fault to a specific circuit -fault is located at lowest level possible -may not be necessary due to circuit being located in a multi-circuit module that is the lowest replaceable unit (LRU) -for schoolhouse this will be circuit card or module not component |
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Failure analysis |
-determine faulty part -repair or replace part -determine cause of failure -return equipment to op. status -record info in T/S log for future personnel -re-order any parts used in repair |
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3 types of diagrams |
-flow diagram -block diagram -schematic diagram |
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Flow diagram |
-follows operation of a unit -allows tech to determine where to begin t.s. -will narrow fault to a specific unit, function, or circuit -most basic diagram -it's a step by step chart that a tech reads and follows -different shapes are for different functions |
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Start or stop point of the process |
Oval |
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An individual step in the process |
Box or rectangle |
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A decision point such as a yes or no or go or no go. Each path emerging from it must be labeled with one of the possible answers |
Diamond |
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A particular step is connected to another page or part of the flow chart. A letter placed in the shape clarifies continuation. |
Circle |
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Shows a measurement is required |
Triangle |
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Block diagram |
-general description of system and it's functions -used in conjunction with text description -shows major components and how they interconnect -components shown in block form and are labeled for identification purposes -a block diagram is a general description of a system and it's functions. It displays units, functional areas, circuit cards, and the interconnections used to join them -block diagram familiarity is essential for every tech |
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Schematic diagram |
-shows electrical connections and functions of a specific circuit arrangement -used to trace the circuit and its functions -disregards physical size shape and location -most defined and most technical of all diagrams |
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Half splitting |
-logical decision to take a measurement with the purpose of cutting the function in half -saves time by elimination many checks in a unit -allows for efficient signal checks |
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Easter egging |
-no logical basis -can produce false readings -safety hazard |
