Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 203
Replacing Power Supply FSP102
The power supply unit FSP102 is located inside the interface units of the
LT31 transmitter and receiver.
1.
Remove the upper interface unit enclosure and open the interface
unit with the provided key.
WARNING
Make sure to switch off the AC switch before replacing the power
supply.
2.
All connectors have to be disconnected and the four spacer bolts
which carry the plastic protector shield, have to be opened to
remove the complete FSP102 module.
3.
After replacing FSP102, reconnect all the connectors carefully and
re-install the plastic protector shield properly.
4.
Turn on the AC power switch (and also the battery backup switch,
if installed).
5.
Close the interface unit and mount the upper interface unit cover
after replacement is finalized.
Replacing Master CPU LTC212
The master CPU LTC212 (see Figure 117 on page 204) is located inside
the interface unit of the LT31 receiver.
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.
Disconnect all the connectors from the LTC212 board.
3.
Open the four screws holding the cover plate and remove it.
4.
Open the two screws holding the LTC212 board in place and
withdraw the board carefully.