Removal and replacement of ADU modules
99-145912-A Chapter 8: Service & maintenance 8-29
For step-by-step instructions see:
• To replace the Cross Elevation DDM on page 8-29
• To replace the Elevation DDM on page 8-30
• To replace the Azimuth DDM on page 8-31
8..6.4.1 To replace the Cross Elevation DDM
To remove the Cross Elevation DDM, do as follows:
1. Open the service hatch.
2. Switch off the power to the antenna on the service switch.
3. Rotate the antenna pedestal so that the arm with the Cross Elevation
DDM module faces the service hatch.
4. Disconnect the 3 connectors at the top of the Cross Elevation DDM,
then the 2 SUB-D connectors at the bottom of the DDM.
Figure 8-27: DC-Motor Driver Module (DDM) for Cross Elevation
Service LED
Power LED
(green or red)
(green)
Tools needed:
• TX20 (SAILOR 900), TX30
(SAILOR 800)
• 4 x 150 mm Allen key
(located inside the service
door of the ADU)
•Flat head screw driver
Note that two connectors are identical. Mark them so you
know where each connector belongs to (e.g. left, right).
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