Removal and replacement of ADU modules
98-133966-G1
Chapter 8: Service & maintenance
8-31
8888
Service & maintenance
8.5.5
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 8-33: DC-Motor Driver Module (DDM) for Cross Elevation
Service LED
Power LED
(green or red)
(green)
SAILOR900TM.book Page 31 Monday, September 16, 2013 11:01 AM
Summary of Contents for Sailor 900 VSAT
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