Troubleshooting & Service T400 Ozone Analyzer Operator’s Manual
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3. Suspect a leak first!
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.
4. Follow the procedures defined in Section 3.4.3 to confirm that the analyzer’s vital
functions are workin
g (power supplies, CPU, relay PCA, touchscreen, PMT cooler,
etc.).
See Figure 3-16 for the general layout of compone
nts and sub-assemblies in
the analyzer.
See the wiring interconnect diagram and interconnect list in Appendix D.
12.1.1. FAULT DIAGNOSIS WITH WARNING MESSAGES
The most common and/or serious instrument failures will result in a warning message
being displayed on the front panel. Table 12-1 lists warning messages, along with their
meaning and recommende
d 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 sub-system (power supply, relay
PCA, 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 T400 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::
