5
6. Align the new microcontroller with the socket (note the
polarity markings on the microcontroller, the socket, and
the circuit board). Be sure all pins are aligned with the
socket, and press the chip firmly into place.
7. Reinsert the batteries. The unit should beep when the last
battery is inserted, and the display should show the model
and serial number, and then ask that date and time be set.
If not, double-check that the polarity of the microcontroller
and socket are the same, and that the the batteries were
inserted properly.
8. Replace the display module back into the station enclo-
sure, reinsert and tighten the four Phillips head screws,
and reconnect the sensor wires.