50 Maintenance and troubleshooting Welch Allyn MicroTymp3 portable tympanometric instrument
4. Push down on the positive (+) end of the battery. The battery will eject.
5. Insert the new battery by placing the positive (+) end of the battery against the
contact in the holder. Push the battery lightly to compress the contact, and lower the
battery into the compartment.
6. Replace the cover by inserting the tip end under the front cover, lowering the opposite
end, and replacing the screw.
Insert the battery only as shown. Failure to observe the correct polarity will
prevent the instrument from functioning.