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Portable Oxygen Analyzer Service Manual
Teledyne Analytical Instruments 39
Note: In the event that none of these procedures produce desired results, remove
the batteries and return the unit to Teledyne for repair.
3.8 Watchdog
The AX300-I is equipped with a watchdog circuit that continuously analyzers the
electronics for proper operation. If the watchdog detects a failure, one of the following
codes will appear on the LCD.
The error codes can appear on the LCD when batteries are first installed,
during normal operation or if the unit is subjected to extreme shock. In some
cases an additional digit is used in the error code to supply additional
information. For example, the error code 6 and 7 are followed by another digit
listed as (N) in Table 3.3. The error code 65 would indicate that a key is stuck
and this key is the Silence key.
In addition to supplying visual error codes, the audio device will beep a
number of times to indicate the general error in case the display is not functional.
Note: To reset the watchdog error code. Remove one battery for 5
seconds and replace. If the error persists contact your locale
representative or Teledyne for assistance.
Table 3-3 Error Codes
Error Code Audio Beeps Error
Indeterminate 2 The watchdog timer has timed out indicating
a serious software error
30 3 Analog output is different from the expected
value. May indicate a shorted or over-loaded
analog output or a failure of the analog to
digital converter or digital to analog
converter circuit.
50 5 The ADC circuit failed during POST.