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fault finding

fault finding

bernard whiles

on 22 March 2013

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Transcript of fault finding

Fault Finding Techniques
When a fault occurs, the equipment will either stop working or will work abnormally
this is classed as a SYMPTOM
what we must do is find the CAUSE and fix it
just think as yourself as a machinery doctor and just like a doctor we must use the symptoms to help us make a
There are three stages to finding the CAUSE
understanding the SYMPTOMS
locating the FAULT
identifying the CAUSE
SYMPTOM: An indication that there is a disturbance to normal operation

FAULT: A defect that causes a symptom to occur

CAUSE: The reason why a fault has occurred

LOCATION: The process which leads to the isolation of the fault or area of the fault
arising from
produced by
Lets look at some common fault finding techniques
The six point plan
The half split technique
The input output technique
Collect the Evidence

Analyse the Evidence

Locate the Fault

Determine and Remove the Cause

Rectify the Fault


Identify the Start or Input

Identify the Finish or Output

Test the system Half-Way between and eliminate one Half

Repeat the process with the Half that is left

Determine the system Function

Determine the Input or Start of the Process

Determine the Output or Finish of the Process

Test each Input To Output for correct Operation

The principal of an algorithm is that required actions can be arrived at by moving through a sequence where each step can be only one of two possibilities.
This concept can be adapted for use as a diagnostic aid in the form of a flow chart

By using manuals to compare parts, measurements and manufacturers guidlines, we can greatly improve our ability to quickly find a sollution.
The MOST IMPORTANT rule about fault finding is
THINK before acting.
The temptation is to dive straight in and just do something....................
but pausing for a moment to think clearly may well allow you to dive in and do the RIGHT thing.
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