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Portable Oxygen Monitor Service Manual
Teledyne Analytical Instruments 35
Service Manual
3.1 General Service Information
The Teledyne Model MX300 Portable Oxygen Monitor is designed to
be robust yet compact in size. In order to achieve maximum reliability in a
microprocessor-based instrument, a single PC board is used which relies
exclusively on surface mount technology. Without access to specialized
probes and test equipment, troubleshooting and repair of circuit board
components are not feasible. A factory replacement of the entire PC board
is more cost effective than a field repair of an individual component
With the exception of replacing the sensor or batteries there are no
user-serviceable components inside the unit. There are no
potentiometers or other adjustments to be made within this instrument. If
a problem arises with either of these models that cannot be corrected by
recalibration ,changing the batteries or replacing the sensor as described
in the users manuals, the unit must be sent back to the factory for repair
or replacement. See Section 3.11 for instructions on obtaining a Return
Merchandise Authorization (RMA) number before sending a unit back
to Teledyne for repair.
3.2 Overall Maintenance
The MX300 requires very little maintenance, other than calibration,
checking and changing the batteries and sensor, and cleaning the plastic
housing. Occasional cleaning of the plastic surface can be done with
isopropyl alcohol. Should any part of the instrument malfunction or fail
to perform, the unit should be removed from service. There are no user-
serviceable components within the instrument.
3.3 Battery Maintenance
DO: Test batteries regularly. (replace immediately when all 5 bars
are missing).
DO: Always use alkaline batteries.
DO: Recalibrate after replacing batteries.