18
Installation Note
E4440-90632
Installation Procedure
Installing the Preamplifier with Option 123
1. Locate and remove semi-rigid cable W100 (attenuator to switch SW5 port 1),
E4446-20071. Discard this cable, since it will be replaced by another cable.
Figure 13
Option 123 Assembly and Cable Locations
2. Locate and remove cable W105 (switch SW5 port 2 to W34 on the RYTHM/SBTX),
E4446-20080. This cable will be replaced later. It is removed to allow the switch
assembly to be removed.
3. Locate and remove ribbon cable W92 (switch SW5 to Option Driver Board J8),
E4440-60455. This cable will be replaced later. It is removed to allow the switch
assembly to be removed.
4. Loosen the three screws (2) that attach the switch bracket to the main bracket. This
will allow the cable W99 to be removed.
5. Locate and remove cable W99 (Unpreselected Mixer A34 output to switch SW5 port
4), E4446-20318. This cable will be replaced later. It is removed to allow the switch
assembly to be removed.