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Troubleshooting & Repair
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.
Customer service data indicate that the majority of all problems are eventually traced to leaks
in the internal pneumatics of the analyzer or the diluent gas and source gases delivery
systems.
Check for gas flow problems such as clogged or blocked internal/external gas lines, damaged
seals, punctured gas lines, a damaged / malfunctioning pumps, etc.
Refer to Figure 3-5 for the general layout of components and sub-assemblies in the analyzer.
Refer to the wiring interconnect diagram and interconnect list in Appendix D.
10.1.1. FAULT DIAGNOSTICS WITH WARNING MESSAGES
260
A systematic approach to troubleshooting will generally consist of the following five
steps:
1. Note any WARNING MESSAGES and take corrective action as necessary.
2. 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.
3. Use the internal electronic status LEDs to determine whether the electronic
communication channels are operating properly.
4. Suspect a leak first!
5. Follow the procedures defined in Section 10.6 to confirm that the analyzer's vital
functions are working (power supplies, CPU, relay PCA, touch-screen display, PMT
cooler, etc.).
The most common and/or serious instrument failures will result in a warning message
displayed on the front panel. Table 10-1 contains a list of warning messages, along with
their meaning and recommended corrective action.
It should be noted that if more than two or three warning messages occur at the same
time, it is often an indication that some fundamental analyzer sub-system (power supply,
relay board, motherboard) has failed rather than an indication of the specific failures
referenced by the warnings. In this case, a combined-error analysis needs to be
performed.
The analyzer will alert the user that a Warning message is active by flashing the FAULT
LED and displaying the Warning message in the Param field along with the CLR button
(press to clear Warning message). The MSG button displays if there is more than one
warning in queue or if you are in the TEST menu and have not yet cleared the message.
The following display/touchscreen examples provide an illustration of each:
Teledyne ML - T100 UV Fluorescence SO2 Analyzer
06807A(DCNxxxx)
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