Teledyne AX300 - Medical application oxygen analyzer - Manual (Page 34)

Service Instructions AX300
Teledyne Analytical Instruments
26
50 5 The ADC circuit failed during POST.
6 (5) 6
(There is no
indication of
which key is
stuck)
A stuck key has been detected. The second
digit example (5) on the display shows
which key is stuck:
1 - Batt
2 - Cal
5 - Silence
8 - Key Lock
7(2) 7
(There is no
indication of
the type of
DAC failure)
A failure has occurred during the automatic
calibration of the digital to analog converter
(DAC) circuit. The second digit example (2)
shows the type of digital to analog failure.
0 - Measurement
1 - High Test
2 - Low Test
3 - Offset Cal
4 - Gain Cal
3.9 Other Problems with the Analyzer
Most other problems arise from either mechanical damage to the
analyzer or electronic component failure.
Repair or troubleshooting the PCB or individual components on the
board is not feasible. Under most circumstances, a replacement of the
entire PC Board is recommended. If the repair diagnosis indicates prob-
lem with the PCB, the analyzer must be returned to the factory for PCB
replacement.
3.10 Return Authorization for Service
For any service beyond sensor and battery replacement, the analyz-
er must be returned to the factory. A return merchandise authorization
(RMA) number must be obtained from Teledyne Analytical Instruments
prior to returning the analyzer for service. You can request a RMA
number via email by contacting us at: