Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 219
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 the air duct. See Figure 72 on
page 115.
2.
Loosen one hex-socket set screw, size 1.5 (see Figure 125 below),
and remove the main receiver module from the optics unit. Use an
edge cutter to cut the cable tie carefully.
1104-113
Figure 125 Securing Screws of LTD112
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.
3.
Replace the LTD112, reconnect the cabling, tighten the securing
screw carefully, and secure the cables with a cable tie. Pay
attention not to damage the optical tube of the main receiver
module while tightening the screw!
4.
The spare LTD112 module is fully adjusted and tested, no
additional adjustments are necessary.