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Troubleshooting and Service Teledyne API – Model T300/T300M CO Analyzer
278
Switch mode supplies create DC outputs by switching the input AC waveform at
high frequencies.
As the components in the switcher age and degrade, the main problem
observed is increased noise on the DC outputs.
If a noisy switcher power supply is suspected, attach an oscilloscope to the DC
output test points located on the top right hand edge of the Relay board.
Look for short period spikes > 100 mV p-p on the DC output
12.5. SUBSYSTEM CHECKOUT
The preceding subsections 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. If the problem is not resolved at this point, the next
step is to check the subsystems. This subsection describes how to determine whether an
individual component or subsystem is the cause of the problem being investigated.
12.5.1. AC MAINS CONFIGURATION
The analyzer is correctly configured for the AC mains voltage in use if:
The Sample Pump is running.
The GFC Wheel motor is spinning. LEDs D1 & D2 (located on the sync/demod
PCA) should be flashing.
If incorrect power is suspected, check that the correct voltage and frequency is
present at the line input on the rear panel.
Note • If the unit is set for 230 VAC and is plugged into 115VAC, or 100VAC the
sample pump will not start, and the heaters will not come up to
temperature.
• If the unit is set for 115 or 100 VAC and 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.
06864B DCN6314