Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 207
7. Turn on the AC power switch (and also the battery backup switch,
if installed).
CAUTION
After replacing 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.
8. Re-install the measurement head cover and lock it carefully.
9. Close the interface unit and mount the upper interface unit cover
after the replacement, fine alignment, and calibration is finalized.
Replacing Receiver Optics Unit LTO212
NOTE
To replace the complete receiver optics unit, the receiver measurement
unit has to be opened. For this reason, it is highly recommended to
dismount the complete measurement unit and carry out the replacement
on a clean workbench in a dry room.
To remove the complete receiver measurement unit, the AC power has to
be switched off first and then the measurement head cover has to be
removed.
1. Remove the upper interface unit cover and open the interface unit
with the provided key.
NOTE
Switch the AC switch off before you proceed with the next steps. In case
of the optional LTBB111, switch the battery backup switch off as well.
See Figure 40 on page 83.
2. Loosen the three lock screws at each side of the measurement head
cover and carefully remove the cover from the measurement head.
See Figure 95 on page 140.
3.
The measurement unit is fixed with two fastening screws. Through
the mast adapter of the support unit, these two hex-socket screws,
size 4 can be reached. See Figure 78 on page 118.
The following steps should be carried out in a closed room. The
measurement unit cover has to be opened carefully.
1. Loosen the four fastening screws of the cover plate, hex-socket,
size 5, and remove the cover with air duct. See Figure 72 on page
115.
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