Teledyne t320u Manuale Utente

Teledyne API – Model T300/T300M CO Analyzer 

Troubleshooting and Service 

12.1.4.  

Several color-coded light-emitting diodes (LEDs) are located inside the instrument to 
assist in determining if the analyzer’s CPU, I

2

C bus and relay board, GFC Wheel and the 

sync/demodulator board are functioning properly. 

12.1.4.1. MOTHERBOARD STATUS INDICATOR (WATCHDOG) 

DS5, a red LED, that is located on upper portion of the motherboard, just to the right of 
the CPU board, flashes when the CPU is running the main program loop.  After power-
up, approximately 30 to 60 seconds, DS5 should flash on and off.  If characters are 
written to the front panel display but DS5 does not flash then the program files have 
become corrupted.  If after 30 – 60 seconds neither the DS5 is flashing or no characters 
have been written to the front panel display then the CPU is bad and must be replaced. 

 

 

 

06864B DCN6314