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CHAPTER 3. TROUBLESHOOTING
SECTION 1. TROUBLE SHOOTING PROCEDURES
1. General
A. Troubleshooting is an orderly process of checking and eliminating possible causes of trouble until the
exact cause of a trouble is found. As a rule, the best place to start looking for the cause of a trouble in a
circuit is at the source of power. Continue testing and checking the circuit, step-by-step, in an orderly man-
ner, until the cause of trouble is located.
B. This section provides information useful in diagnosing and correcting certain troubles which cause un-
satisfactory operation or failure of the equipment.
C. Minor troubles may be remedied by the operator; however, major repairs must be undertaken by experi-
enced mechanics and electricians only.
2. Trouble Shooting Chart (Figure 5)
A. Description
The troubleshooting chart lists information under three headings as follows:
(1) Trouble, Symptom, and Condition
(2) Probable Cause
(3) Test, Check, and/or Remedy
B. Use of the Trouble Shooting Chart
(1) A troubleshooting chart is furnished to provide maintenance and repair personnel with a time-sav-
ing guide for locating trouble. To use the chart, proceed as follows:
(a) Locate the symptom (s) of trouble in the "Trouble" column.
(b) Check the probable causes of trouble in the "Probable Cause" column.
(c) Test, check, repair, or correct the trouble as indicated in the "Remedy" column.
(2) If the cause of a trouble is an uncommon one and cannot be located by use of the chart, the only
alternative is to start at the source of power or supply and check the affected circuit or system com-
pletely. Use schematic and connection diagrams which are supplied with this manual.
(3) Electrical components mentioned in the trouble shooting chart are identified by a noun name and
corresponding symbol which allows the user to identify the item more easily on schematic diagrams.
(4) It is assumed that wiring and connections in defective circuits have been thoroughly checked be-
fore condemning any other components.
August 5/89 Revised
OM-2031
3-1
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