MAINTENANCE GUIDE
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Antenna Control Unit Maintenance Guide
10000025991 | Revision 2 | November 2021 | © Radio Frequency Systems 2021
7
a) Components of the ACU device
b) Hexagonal ACU interface
c) Multiband and daisy-chaining
Figure 2:
Steps for replacing an ACU-A20 device
3.2.2: Replacing an ACU that does NOT belong to the ACU-A20 Family
The ACUs of the families ACU-I20-H, ACU-I20-B, ACU-X20-B, ACU-X20, ACU-X20H are flush mounted to
a bottom end cap of an antenna (as depicted in Figure 3, the bullet
[O]
highlights an ACU’s panel of
AISG connectors).
Figure 3:
Location of the ACU on an antenna
Remove the AISG cable(s)
[1]
(Figure 4 - a) from the AISG connector(s).
Untighten the 2 screws
[3]
(Figure 4 - a) progressively and alternatively, by maintaining the ACU
through the
[2]
handle. The type of those screws depends on the ACU model. Please refer to Table 2
for using the appropriate wrench (cruciform or Torx).
Use the handle
[2]
for removing the defective ACU device
[4]
.
Mount the new ACU device [3] to the antenna and maintain the device through its
[2]
handle.
Tighten the 2 screws progressively and alternatively.
Plug the AISG cable(s)
[1]
.
NOTE
: If there is only one primary AISG cable to plug: ALWAYS USE THE PORT “
IN A
” (or “
IN 1
”).
