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Portable Oxygen Monitor
Service Manual
3.1 General Service Information
The Teledyne Model AD300 and MD300 series of portable oxygen
monitors are 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 elsewhere in
this manual, the unit must be sent back to the factory for repair or
replacement. See Section 3.9 for instructions on obtaining a Return
Merchandise Authorization (RMA) number before sending a unit back
to Teledyne for repair.
3.2 Overall Maintenance
The AD/MD 300 series of instruments require 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.
Teledyne Analytical Instruments
Service Manual
29
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