Removal and replacement of ADU modules
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Chapter 8: Service & maintenance
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8.5.3 Replacing the DC-Motor Driver Module
(DDM)
The ADU is equipped with three (3) DDMs for the axes:
• Cross Elevation DDM
• Elevation DDM
• Azimuth DDM
By the input from the PCM the DDM controls the power delivered to
the DC-motors to control the orientation of the ADU.
The DDM has two LEDs for status and troubleshooting:
• Power LED: green or Off
• Service LED: green or red
For step-by-step instructions see:
•
•
•
•
•
•
Figure 8-19: DC-Motor Driver Module (DDM) for Cross Elevation
Service LED
Power LED
(green or red)
(green)
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