User's Guide ______________________________________________________________________
214 _________________________________________________________________ M210667EN-C
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 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
.
2.
To replace the LTL212, the optics unit has to be removed first.
Two fastening screws (hex-socket size 3) and one fastening bolt
(socket wrench, size 7) have to be loosened. For an example, see
Figure 121 on page 210. Disconnect the three plugs at the rear end
of the LTC112 board.
3.
Check if it is necessary to clean the measurement unit windows
from the inside. Wipe the window panes with a soft, lint-free cloth
and normal glass cleaner or isopropyl alcohol. Be careful not to
scratch the window surfaces.
4.
Open two hex-socket screws, size 2, from the window transmitter
module and remove it from the optics unit. Use an edge cutter to
cut the cable tie carefully. See Figure 123 below.
1104-111
Figure 123 Fastening Screws of LTL212