Answers for frame 2:
(1) detailed knowledge of system operation.
(2) knowledge of use of test equipment.
(3) effective use of technical manuals.
(4) logical analysis of information gained from malfunctioning system.
3. Every technician should constantly strive to improve his knowledge of the
systems he works with, his use of test equipment, and his effective use of
technical manuals. However, the logical analysis of information gained from
a malfunctioning system requires first that he consider two important
questions:
(1) Where to troubleshoot?
(2) What to troubleshoot?
Most modern electronic systems consist of many circuits and components. To
approach a malfunctioning system blindly, hoping to stumble on the trouble,
only wastes time and creates problems. Normally, only one portion of a
system goes bad at once. By isolating the bad portion, the work of the
technician can be made much easier. He must know where to troubleshoot.
There are three steps which can help him isolate the bad portion of a system
from the rest of it. First, all the symptoms must be found. Next, the
abnormal signal paths (circuits or components showing faulty
characteristics) must be determined. Last of all, the troubleshooter must
establish brackets, either mentally or on a block diagram of the system, to
isolate the malfunctioning portion of the system from the normal portion.
These three steps are used to establish "initial brackets." Initial
brackets help the troubleshooter avoid making pointless checks later on.
They get him started on the right track.
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IT0338
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