Vaisala LT31 - Page 215

Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 215
CAUTION
Handle the module carefully. Do not touch the components on the board
to avoid ESD damage to them. Ground yourself before attempting to
touch the board.
CAUTION
Do not let the module get wet.
5. Replace the LTL212 and tighten the fastening screws carefully.
Secure the cables with a cable tie.
6. The spare LTL212 module is fully adjusted and tested, no
additional adjustments are necessary.
7. After replacing the LTL212 module, pay attention to the correct
position of the optics unit inside the measurement unit enclosure. It
should be mounted in parallel to the enclosure walls.
8. Reconnect the three plugs at the rear end of the LTC112 board.
9. Tighten the two fastening screws and the bolt carefully.
10. Close the measurement unit carefully. Pay attention to the position
of the cover seal.
11. The repaired measurement unit must be mounted in the same way
as described in sections Mounting Receiver Measurement Unit on
page 124 and Mounting Transmitter Measurement Unit on page
114.
12. Make sure that the enclosure is parallel to the support unit.
13. Secure the fastening screws of the measurement unit carefully.
14. Turn on the AC power switch (and also the battery backup switch,
if installed).
CAUTION
After repairing the measurement unit, fine alignment and calibration
must be carried out to establish normal operational conditions. For
details, see sections Fine Alignment on page 231 and Calibration on
page 232.
15. Re-install the measurement head cover and lock it carefully.
16. Close the interface unit and mount the upper interface unit cover
after fine alignment and calibration is finalized.