Asymtek C702, Student Manual

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Level 2 Maintenance Training, Century Series 4-11 P/N 73-0028-00 Revision A
Level 2 Module 4
STUDENT GUIDE
LESSON 9 Dispense Valve Motor Failures
OBJECTIVE : Upon completion of this lesson, the student should be able to
correct when the dispense valve motor will not drive forward or reverse failure.
EXERCISE 5-1 Troubleshooting Dispense Valve Motor Failures
FAILURE EXAMPLE
The machine operator reports that the measured flow rate is too low (well below spec), and when
the valve purges hardly any fluid comes out.
•
Understand the Problem
Ask the operator when the problem started and if anything has been done to the machine
recently. Repeat the problem and observe exactly what is happening.
•
Use Available References
Look in your reference material for any applicable RFCs or trouble-shooting instructions.
•
Brainstorm Root Causes
Write all the possible root causes.
•
Create a Test Plan
Come up with a test to eliminate each possible root cause. Once you’ve identified all the tests
prioritize the order you’ll do the tests by considering how long each test will take, and how
likely each root cause is.