129 • Chapter 6: Maintenance GX-3R Pro Operator’s Manual
9. Reinstall the filter gasket/sensor retainer assembly. The black and white filter goes over the
CO/H
2
S sensor with the black half of the filter facing the edge of the GX-3R Pro. Be sure the
filter gasket/sensor retainer is oriented correctly.
10. If the filter gasket/hydrophobic dust filter came out, reinstall it with the gasket tabs facing
down.
11. Reattach the bottom cover to the GX-3R Pro. Push it onto the GX-3R Pro until it snaps into
place.
12. Reinstall the two screws that were loosened in Step 3.
13. Calibrate the new sensors as described in “Chapter 5: User Mode and Calibration” on page 60.
If a new H
2
-compensated CO sensor was installed, you need to calibrate with CO and set the
H
2
response.
Replacing the Battery Board
Replace the battery board when the GX-3R Pro doesn’t hold a charge anymore.
1. Verify that the GX-3R Pro is off.
2. Remove the rubber boot, if installed.
3. Place the GX-3R Pro LCD-side-down.
4. Unscrew the 4 screws that hold the two case halves together. The alligator or belt clip does not
need to be removed.
5. Separate the two case halves. You may need to pry them apart.
6. The rear half of the case has the battery board.
Figure 19: Removing Case Screws
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