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Training, Installation & Service Manual - Livewire Connections Ltd

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(green or red)<br />

When the antenna dish is moved by the motors and ships motions,<br />

in all its plans the ISM provides the information regarding these<br />

movements.<br />

This information is based on rate gyro and accelerometers mounted<br />

in the ISM.<br />

The information is passed on to the PCM.<br />

The ISM has two LEDs for status and troubleshooting:<br />

• Power LED: green or Off<br />

• <strong>Service</strong> LED: green or red<br />

9.5.10.1 Removing the ISM<br />

Power LED<br />

(green)<br />

<strong>Service</strong> LED<br />

Figure 9-93: Inertial Sensor Module (ISM)<br />

1. Open the service hatch by releasing the two latches.<br />

2. Switch off the power to the antenna on the service switch.<br />

Removal and replacement of ADU modules<br />

Tools needed:<br />

• 4 x 150 mm Allen key<br />

(located inside the<br />

service door of the ADU)<br />

• Flat head screw driver<br />

9999<br />

3. Press in and turn the elevation locking pin (only available from<br />

S/N TBD) to locked position.<br />

4. Rotate the antenna so that you can reach the ISM.<br />

5. Loosen the 4x4 mm Allen screws.<br />

<strong>Service</strong> & maintenance<br />

98-133966-E2 Chapter 9: <strong>Service</strong> & maintenance 9-71

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