Owner manual

Page 38 of 48
7 Troubleshooting
7-1 Introduction
Part failure of a mechanical or electrical component may occur,
therefore, this section has been prepared to serve as a guide to
trouble-shooting possible malfunctions.
7-2 Safety
The utmost in safety precautions should be observed at all times
when working on or around the machine and the electrical
components. All normal trouble-shooting must be accomplished
with the Main Power switch Off, the line fuses removed, and
whenever possible, with the machine tagged as Out Of Service.
7-3 Test Equipment
The use of good quality test equipment cannot be over-emphasized
when trouble-shooting is indicated. Use a good ammeter that can
measure at least twice the AC and DC current that can be
encountered for the machine. Be sure that the voltmeter has at least
minimum impedance of 5,000 OHMS per volt on AC, and 20,000
OHMS per volt on DC scales. Popular combination meters, VOM
and VTVM can be selected to provide the necessary functions.
7-4 Locating the Trouble
Before making haphazard substitutions and repairs when defective
electrical components are malfunctioning, it is recommended that
you check the associated circuitry and assemblies for other
defective devices. It is not too uncommon to replace the obviously
damaged component without actually locating the real cause of
trouble. Such hasty substitutions will only destroy the new
component. Refer to wiring diagrams and schematics.
Locating of mechanical problems, should they occur, is relatively
straightforward. When necessary, refer to the Spare Parts List on
page 42.
7-5 Troubleshooting Chart
Troubleshooting procedures are listed in tabular form in Figure 12.
The first column lists the apparent problem or symptom, the
second column contains the probable cause, and the third column
suggests possible remedies.