Teledyne t320u Manuale Utente

Troubleshooting and Service 

Teledyne API – Model T300/T300M CO Analyzer 

  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  

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.   

06864B DCN6314