Replacing The Hvmf Cooling Fan, Version 2 - Nokia MetroSite Maintenance Manual

6.8.2

Replacing the HVMF cooling fan, version 2

BTS installations fitted with version 2 of the HVMF fan assembly can be
removed without removing the complete fan assembly mounting. The screws
retaining the fan unit and controller module can be reached from the underside of
the BTS. Compare Figure 13 with Figure 12.
Note
To replace a version 1 fan unit with a version 2 fan unit which can be replaced
from the underside, the fan assembly mounting must also replaced with a version
2 compatible fan assembly mounting.
Replacing the HVMF fan, version 2
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Make sure that the PSU is switched to the stand-by position and that the
power to the BTS is switched off at the main circuit breaker.
Remove the three M4 x 60 Torx screws from the fan unit to release the fan
unit and the lower fan guard. See Figure 12.
Remove the two 3 x 10 self tapper screws on the side of the fan controller
module. See Figure 13.
Remove the fan controller module from the backplane and then remove the
fan and lower fan guard.
To replace the fan, reverse the procedure.
Draft
Maintenance
DN9913495
Issue 3-0 en