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CHAPTER 3. TROUBLESHOOTING
SECTION 1. TROUBLESHOOTING PROCEDURES
1. General
Troubleshooting is an orderly process of checking and eliminating possible causes of trouble until the ex-
act cause of a trouble is found. As a rule, the best place to start looking for the cause of a trouble in a cir-
cuit is at the source of power. Continue testing and checking the circuit, step-by-step, in an orderly
manner, until the cause of trouble is located. See connection and schematic diagrams.
2. Troubleshooting Chart
A. Description
The troubleshooting chart lists information under three headings:
(1) Trouble, symptom, and condition.
(2) Probable cause
(3) Test, check and remedy
B. Use of the Troubleshooting Chart
Read the trouble symptoms and conditions before proceeding to causes and remedies. For example,
at the beginning of the troubleshooting chart under ENGINE, the first trouble listed is: "Engine will not
start. Starter will NOT crank engine." If the starter WILL crank the engine, then obviously this is not
your symptom and condition. Go the next trouble and symptom directly below.
If the starter will NOT crank the engine, look to the right under PROBABLE CAUSE and TEST,
CHECK, AND REMEDY and find the various things which could cause the trouble and what to do to
check and remedy them.
3. Equipment for Troubleshooting
A good quality, multi-scale voltohmmeter is the only instrument required for troubleshooting. At least two
jumper leads with "alligator", or similar clips, will be required. The 12 volt engine electrical system may be
used for a 12 volt DC power source.
4. Safety
WARNING: LOOSE GARMENTS, NECKTIES, AND OTHER HANGING ITEMS
MUST NOT BE WORN BY PERSONNEL NEAR THE FAN OR OTHER EX-
POSED MOVING PARTS OF THIS EQUIPMENT WHILE IT IS RUNNING. ALSO,
AVOID CONTACT WITH LIVE ELECTRICAL PARTS. DEATH OR SERIOUS IN-
JURY COULD RESULT!
May 20/89
OM-2049
3-1
Page 1
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Table of Contents
Troubleshooting
