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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 283
12.7. SUBSYSTEM CHECKOUT
The preceding sections of this manual discussed a variety of methods for identifying possible sources of
failures or performance problems within the analyzer. In most cases this included a list of possible
causes and, in some cases, quick solutions or at least a pointer to the appropriate sections describing
them. This section describes how to determine if a certain component or subsystem is actually the cause
of the problem being investigated.
12.7.1. AC MAIN POWER
The 9110T analyzer’s electronic systems will operate with any of the specified power regimes. As long
as system is connected to 100-120 VAC or 220-240 VAC at either 50 or 60 Hz it will turn on and after
about 30 seconds show a front panel display.
Internally, the status LEDs located on the Relay PCA, Motherboard and CPU should turn on as soon
as the power is supplied.
If they do not, check the circuit breaker built into the ON/OFF switch on the instruments front panel.
If the instrument is equipped with an internal pump, it will begin to run. If it does not:
Verify that the pump power configuration plug is properly wired (see Section 13.7.1.1 and
Figure 13-27)
If the configuration plug is set for 230 VAC and the instrument is plugged into 115 VAC or
100 VAC the sample pump will not start.
If the configuration plug is set for 115 or 100 VAC and the unit is plugged into a 230 VAC circuit, the
circuit breaker built into the ON/OFF Switch on the front panel will trip to the OFF position
immediately after power is switched on.
9110T’s without internal pumps that are configured for 230 V will still turn on at 115 V, but the
heaters may burn out or not heat up fast enough.
WARNING – ELECTRICAL SHOCK HAZARD
Should the AC power circuit breaker trip, investigate and correct the condition
causing this situation before turning the analyzer back on.
12.7.2. DC POWER SUPPLY
If you have determined that the analyzer’s AC mains power is working, but the unit is still not operating
properly, there may be a problem with one of the instrument’s switching power supplies. The supplies
can have two faults, namely no DC output, and noisy output.
To assist tracing DC Power Supply problems, the wiring used to connect the various printed circuit
assemblies and DC Powered components and the associated test points on the relay PCA follow a
standard color-coding scheme as defined in the following table.