Maintenance and fault finding
108 Block Up Converter Systems 6700/6900 series User Guide
Reverting to a single-BUC earth station
If it is necessary to remove the redundancy controller from the
system because it is faulty, you can restore communications by
reverting to a basic, single-BUC earth station. You can either
leave the RF waveguide switches in place or remove them.
To revert to a single-BUC earth station:
1 Switch off the redundancy controller.
1 Remove the control and IF coaxial cables between the
redundancy controller, BUCs and LNBs (if used).
1 At the redundancy controller, unplug the two IF coaxial
cables that connect to the modem or other equipment.
Reconnect these cables directly to the on-line BUC.
If you are unsure of the position of the RF waveguide
switches, use a multimeter to check the tell-back contacts
at the control connector for the RF waveguide switch
(see Table 26).
1 Remove any remote interface cable from the
Auxiliary I/O connector on the redundancy controller.
1 If you need to remove a faulty RF waveguide switch,
connect the BUC or LNB directly to the antenna feed.
1 Seal all N-type connections with self-amalgamating tape.
Table 26: Tell-back contacts for switch positions 1
and 2
Switch position 1 Switch position 2
D–E closed D–E open
F–E open F–E closed
CAUTION
Ensure all joints are completely
weatherproof.
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