7.
Taking time to establish initial brackets is important because it ensures
getting started on the right track. The first step in establishing initial
brackets is to find all the symptoms. Most of these can be observed by
checking the "front panel" the operating controls for the complete system.
Whether it is a simple communications receiver or a complicated bombdirector
system, by checking for the proper functions of each operation control the
troubleshooter can narrow down the possibilities and choices he must make.
Once he has found all the symptoms, he can go to a schematic or a block
diagram and note the affected signal paths or circuits. He must be sure to
include every stage and component which is in some way affected by the
trouble. Once he has done this, he is ready to establish his initial
brackets. They may include the whole system, or they may include only a
small portion of the system. When these have been established, the trouble
area has been determined. The troubleshooter can avoid making pointless
checks by checking within the brackets, by avoiding redundant checks and
premature checks. Each check made should shift one or the other bracket
closer to the trouble until only the exact trouble remains.
Match the following terms with their definitions by placing the correct
letter in each blank.
a.
Premature check
___
First step to establish initial brackets
___
Check outside the brackets
b.
Redundant check
___
Check not usable for lack of information
___
Last step to establish initial brackets
c.
Establish the brackets
___
Check which is repeatednot necessary
___
Second step is to establish initial brackets
d.
Find the symptoms
___ Two major questions in troubleshooting
e.
Irrelevant check
f.
Determine the affected
stages or circuits
g.
Where and what to
check?
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