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5.1 Guideline for Troubleshooting
Troubleshooting is not easy, because symptoms differ according to the faulty parts. A guide line for
troubleshooting is easily provided by the following two means:
1 . Check out procedure
Purpose:
Level:
Guideline for troubleshooting for faults with indefinite symptoms.
Replace corresponding units. (Repairable by persons who have a basic mechanical
knowledge.)
?.
Unit troubleshooting flowchart
Purpose:
Repair individual faulty unit at part level.
Level:
Since troubleshooting is made at part level, it requires deep knowledge and high
technical skill.
Troubleshooting Method
o
As the first step( use the check out procedure and perform troubleshooting by replacing the corre-
sponding units. In this case, be sure to check again that the replaced unit is not defective.
(This is done to distingwish the fault from those caused by contact failure of connectors.)
o
As the second step, replace the defective element in the corresponding unit according to the unit
flowchart or table of faults.
Notes 1: When a checking item appears in the flowchart, be sure to do it. If a part or unit is
replaced without checking, the new part or unit may be damaged again.
2: When the troubleshooting procedure becmes indefinite halfway, be sure to return to the
first entry and restart the procedure.
Step 1
Check-out
procedure
Troubleshooting by
replacing the cor-
responding unit.
Step 2
Unit trouble-
shooting flowchart
Troubleshooting at
part level.
5-1
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