Teledyne MODEL T703 Manuale Utente

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To test the Control Output electronics: 

1.  Connect a jumper between the “E“ pin and the “” pin on the status output connector. 

2.  Connect a 1000 ohm resistor between the “+” pin and the pin for the status output that is being tested. 

3.  Connect a voltmeter between the “” pin and the pin of the output being tested (see Table 11-12).   

4. Under 

the 

DIAG SIGNAL I/O menu (See Section11.1.3), scroll through the inputs and outputs until 

you get to the output in question.  

5.  Alternately, turn on and off the output noting the voltage on the voltmeter. 

   It should vary between 0 volts for ON and 5 volts for OFF.   

 

There are two major types of CPU board failures, a complete failure and a failure associated with the Disk On 
Module (DOM). If either of these failures occurs, contact the factory. 

For complete failures, assuming that the power supplies are operating properly and the wiring is intact, the CPU 
is faulty if on power-on, the watchdog LED on the motherboard is not flashing. 

In some rare circumstances, this failure may be caused by a bad IC on the motherboard, specifically U57, the 
large, 44 pin device on the lower right hand side of the board. If this is true, removing U57 from its socket will 
allow the instrument to start up but the measurements will be invalid. 

If the analyzer stops during initialization (the front panel display shows a fault or warning message), it is likely 
that the DOM, the firmware or the configuration and data files have been corrupted.  

07223B DCN6378