6 maintenance and trouble shooting, Maintenance 6.1, Trouble shooting 6.2 – Norsat O3b 10W BUC User Manual

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© 2013 Norsat International Inc.

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6 MAINTENANCE AND TROUBLE SHOOTING

MAINTENANCE

6.1

Ka band 10W BUC is designed for a minimum of maintenance and does not use fans for cooling.

Instead, it has two heat sinks with lots of air cooling fins on the cover and body of the BUC for

cooling. Therefore, periodic scheduled maintenance is not required. However, make sure that it is

mounted upside down so that fins of the body heat sink are open to fresh air as shown in Fig. 7.

And check periodically that there are no objects that obstruct a flow of fresh air into the fins of the

body heat sink.

TROUBLE SHOOTING

6.2

The BUC GUI window shows various status of the BUC such as LO Lock, Over-temperature, Over-

power, and External Mute. These states indicate the faults that may arise in the BUC. The BUC is

designed to automatically turn on the SSPA to avoid transmitting unwanted power to the target

satellite if one of LO Lock, Over-temperature, Over-power, and External Mute states becomes red

on BUC GUI window during the operation.

The following explains two major types of faults and how to troubleshoot them.

A) SSPA is off

1) When LO Lock state became red on the BUC GUI window.

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The internal LOs are out of lock.

 Check the power level of 10MHz reference source at the modem side or at the BUC

input side.

 Otherwise, since the BUC is faulty, contact Norsat for further support.

2) When Over-temperature state became red on the BUC GUI window.

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The BUC is faulty if the BUC is hot

 Contact Norsat for further support

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M&C processor is temporally malfunctioning if the BUC is not hot.

 Turn off the main power supply of +48V and wait for about 5 minutes, and then turn

on again and check the Over-temperature state on the BUC GUI window.

3) When Over-power became red on the BUC GUI window.

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IF input power is too high

 Check the IF input power level.

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