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Troubleshooting & Service T400 Ozone Analyzer Operator’s Manual
250
12.1.3. DIAG SIGNAL I/O: USING THE DIAGNOSTIC SIGNAL I/O
FUNCTION
The signal I/O diagnostic mode allows access to the digital and analog I/O in the
analyzer. Some of the digital signals can be controlled through the touchscreen. These
signals, combined with a thorough understanding of the instruments Theory of
Operation (found in Section 13), are useful for troubleshooting in three ways:
The technician can view the raw, unprocessed signal level of the analyzer’s critical
inputs and outputs.
Many of the components and functions that are normally under algorithmic control
of the CPU can be manually exercised.
The technician can directly control the signal level Analog and Digital Output
signals.
This allows the technician to observe systematically the effect of directly controlling
these signals on the operation of the analyzer. Figure 12-1 is an example of how to use
the Signal I/O menu to view the raw voltage of an input signal o
r to control the state of
an output voltage or control signal.
06870C DCN6332