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Removal and replacement of ADU modules
1. GNSS module.
2. VSAT Interface Module (VIM3).
3. Pedestal Control Module (PCM2).
4. Service switch.
In switch-off position the Motor Driver modules (DDM/SMD), the Polarisation Motor
Module (PMM) and the BUC are turned off for safe conditions during service and
repair. The switch must be in on position for normal ADU operation.
5. Motor Driver modules (DDM/SMD).
6. Cross elevation motor and encoder.
7. Zero Reference Module (x3) (ZRM) (not visible on photo). (2 in the figure above, i in
the figure below.
8. Motor Driver Module for elevation (on the bottom side) (DDM/SMD).
9. Elevation motor and encoder (not visible).
10.BUC Control Module (BCM).
11.Block Up Converter (BUC). (behind cable screen, not visible on photo)
12.Low Noise Block down converter.
13.Polariser.
14.Inertial Sensor Module (ISM).
15.Elevation locking pin to lock the antenna dish in a fixed position (for safety during
service) (not visible on photo).
7-18
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