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7. TROUBLESHOOTING & SERVICE
The operations outlined in this Section must be performed by qualified maintenance
personnel only.
Risk of electrical shock. Some operations need to be carried out with the analyzer 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.
7.1. GENERAL TROUBLESHOOTING
07270D DCN7141
This section contains a variety of methods for identifying and solving performance
problems with the analyzer.
The analyzer has been designed so that problems can be rapidly detected, evaluated and
repaired. During operation, the analyzer 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:
•
Note any warning messages and take corrective action as necessary.
•
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.
•
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 board. 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
board.
•
Suspect a leak first! Technical Support data indicate that the majority of all problems
are eventually traced to leaks in the pneumatic system of the analyzer (including the
external pump), the source of zero air or span gases or the sample gas delivery
system. Check for gas flow problems such as clogged or blocked internal/external
gas lines, damaged seals, punctured gas lines, a damaged pump diaphragm, etc.
•
Follow the procedures defined in Section 3.6.3 to confirm that the analyzer's vital
functions are working (power supplies, CPU, relay board, PMT cooler, etc.). See
Figure 3-5 for general layout of components and sub-assemblies in the analyzer.
See the wiring interconnect diagram in Appendix D.
CAUTION
WARNING
215
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