Removal and replacement of ADU modules
98-133966-G1
Chapter 8: Service & maintenance
8-39
8888
Service & maintenance
8.5.7
Replacing the Pedestal Control Module
(PCM)
The PCM controls the antenna dish and the Polarization Mechanism
Assembly with the three DC motors and a step motor. Communication
between the PCM and ACU is done via the VIM. The VIM is also
controlled by the PCM via a parallel interface cable.
The PCM is the communication master of the ADU serial-bus connecting
the DDM, PMM and ISM. Communication to the GPS Module and power
to all modules is via S-bus.
The PCM has two LEDs for status and troubleshooting:
• Power LED: green or Off
• Service LED: green or red
To replace the PCM, do as follows:
1. Open the service hatch by releasing the two latches with Torx screws.
2. Switch off the power to the antenna on the service switch.
3. Rotate the antenna pedestal so that the Pedestal Control Module
(PCM) faces the service hatch.
Tools needed:
• 4 x 150 mm Allen key
(located inside the service
door of the ADU)
• Flat head screw driver
• 8 mm open-end spanner
Figure 8-43: Location of the PCM
SAILOR900TM.book Page 39 Monday, September 16, 2013 11:01 AM
Summary of Contents for Sailor 900 VSAT
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