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12. TROUBLESHOOTING & SERVICE
This section contains a variety of methods for identifying the source of performance
problems with the analyzer. Also included in this section are procedures that are used in
repairing the instrument.
QUALIFIED TECHNICIAN
The operations outlined in this Section must be performed by qualified
maintenance personnel only.
CAUTION – RISK OF ELECTRICAL SHOCK!
Some operations need to be carried out with the instrument open and
running.
Exercise caution to avoid electrical shocks and electrostatic or mechanical
damage to the analyzer.
Do not drop tools into the analyzer or leave those after your procedures.
Do not shorten or touch electric connections with metallic tools while
operating inside the analyzer.
Use common sense when operating inside a running analyzer.
12.1. GENERAL TROUBLESHOOTING
The T400 Photometric Ozone Analyzer has been designed so that problems can be
rapidly detected, evaluated and repaired. During operation, it continuously performs
diagnostic tests and provides the ability to evaluate its key operating parameters without
disturbing monitoring operations.
A systematic approach to troubleshooting will generally consist of the following five
steps:
1. Note any WARNING MESSAGES and take corrective action as necessary.
1. Examine the values of all TEST FUNCTIONS and compare them to factory values.
Note any major deviations from the factory values and take corrective action.
2. Use the internal electronic status LEDs to determine whether the electronic
communication channels are operating properly.
Verify that the DC power supplies are operating properly by checking the
voltage test points on the relay PCA.
Note that the analyzer’s DC power wiring is color-coded and these colors match
the color of the corresponding test points on the relay PCA.
06870C DCN6332