Zeiss humphrey HFA II-i series Field Service Manual page 154

Troubleshooting
Solid Failure
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# Intermittent Duplicable
sequence of events reproduces the intermittent symptom, although occasionally
these problems may be random in nature. By performing the proper sequence of
events, the problem can usually be reproduced. If a sequence of events readily
reproduces the problem, examination of this sequence of events may help identify
the faulty assembly.
# Intermittent Non-Duplicable
attempts at recreating the symptoms fail. These are the most difficult problems to
resolve.
Check for Field Service Bulletins that Address the Problem.
3)
If a service bulletin addresses a resolution, be sure to take the necessary equipment to
perform the changes.
While On-Site:
4) Have the Operator Demonstrate the Problem.
This is very important. Before doing anything, always have the operator attempt to
demonstrate the problem to you. By having the operator demonstrate the problem,
you may solve the problem immediately, or avoid some incorrect assumptions. Having
the operator demonstrate the problem will ALWAYS result in one of the following:
#
Reveal Operator Error
is operator error. You then have the opportunity to train the customer in the
proper use of the instrument, instead of spending time troubleshooting a
nonexistent instrument problem.
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Demonstrate specific problem sequence
specific sequence of events needed to reproduce the problem, reducing your
diagnostic time.
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Help Form Ideas
However, the sequence of steps used to demonstrate the problem will give you
ideas on how to pursue the problem in other ways. In this case you have the
opportunity to explain to the customer the difficulty in resolving a nonduplicable
problem.
Resolve the Obvious.
5)
Obvious mechanical or physical defects should be resolved when discovered. Often,
resolving the obvious will lead you to the real problem.
Field Service Guide
- the problem presents itself continuously.
- the problem is intermittent in nature. Usually a specific
- the problem is intermittent, and all reasonable
- You may immediately see that the cause of the problem
- The operator may not be able to duplicate the problem.
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Humphrey Field Analyzer II - i
- The operator will show you the
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