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OM-2032 / Operation and Maintenance Manual
100D20 / Generator Sets
Chapter 3. Troubleshooting Procedures
Section 1. Troubleshooting
1. General
a. Troubleshooting is an orderly process of checking and eliminating possible causes of trouble until
the exact cause is located. When looking for the cause of a trouble in a circuit or system begin at
the source of power or supply. Continue testing and checking the circuit, or system, step-by-step, in
an orderly manner, until the cause of trouble is located.
b. The chapter provides information for diagnosing and correcting certain troubles which cause
unsatisfactory operation or failure of the equipment.
c. Minor troubles may be remedied by the operator, however, major repairs must be undertaken by
experienced mechanics and electricians only.
2. Troubleshooting
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 Troubleshooting Chart
(1) A troubleshooting chart is furnished to provide maintenance and repair personnel with a
time-saving 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, start at
the source of power or supply and check the affected circuit or system completely. Use
schematic and connection diagrams supplied with this manual.
(3) Electrical components mentioned in the troubleshooting chart are identified by a noun name and
a 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
before condemning any other components.
March 28/94 Revised
Chapter 3-1
Page 1
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