3.5 FAULT FINDING FLOW CHARTS
The
flow charts may be used whenever a system failure occurs. They are a means of
a fault
in one of the printed board assemblies
in an established
working system.
Always commence at the “Start” block.
Flow Chart Symbols:
Decision Function:
This block contains a question which may be answered only by a ‘YES’ or a ‘NO’. ONE
ONLY of its two outward paths may be taken, depending upon that answer.
l **** l **
A c t i o n / O p e r a t i o n :
This block contains instructions defining an action to be taken (e.g. board replacement) or
a test to be made (this will precede a decision function). It is essential to comply exactly
with the instructions.
l * * * . * * * * * * * 4 * * * *
l
l
l
ACT ION
l
l
l
l * * * C * * t * * * * * * ‘ * *
Data Block:
This does not form part of the fault-finding sequence, but provides necessary information
(e.g. connector points, terminal allocations, etc.) required by an ‘Action or Decision Block’.
It is attached to the relevant ‘Action or Decision’ block by a dotted line.
l .
l
l
. . . . . . . . . . . . . . . . . . . . . . . . .
l
DATA
128
ISSUE 1