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Troubleshooting and ServiceTeledyne API – Model T300/T300M CO Analyzer
Teledyne Analytical Instruments 257
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.
Motherboard
CPU Status LED
Figure 12-3: CPU Status Indicator