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Preventive Maintenance and Fault-finding
5.5.2 Preliminary Checks - Has the MX8400 Multiplexer Failed?
The following information is intended to isolate the MX8400 Multiplexer as faulty
equipment when a system failure occurs.
Warning!
Do not remove the covers of this equipment. Hazardous voltages are present within
this equipment and may be exposed if the covers are removed. Only Ericsson
trained and approved service engineers are permitted to service this equipment.
Caution!
Maintenance on this equipment must only be undertaken by properly trained
personnel appointed or authorized by Ericsson. Unauthorized maintenance or the
use of non-approved replacements may invalidate any warranties or affect the
equipment specification or both.
Note: If the following information fails to clear the abnormal condition, please
contact Customer Services using the information given in the Preliminary
Pages of this Reference Guide.
Characteristically, the MX8400 Multiplexer either functions correctly or fails
completely. It is unlikely to exhibit degraded performance. There are few exceptions
to this general rule.
Run through the following initial list:
1. Ensure the Green Power indicator on the front of the unit is lit. If the indicator is
off, investigate the AC supply and fuses.
2. In the first instance, check the external connections. Ensure they are in place
and serviceable.
3. Ensure the Red Alarm indicator on the front panel of the unit is off. During
normal start-up, this indicator will remain on for about five to ten seconds during
initial power up and then should extinguish. If it stays on, investigate the
Fail/Alarm status page of nCompass.
Note: nCompass Control stores error and alarm messages in a Fault Log.
However, these messages are only kept for three days.
4. Check the status indicators at the rear panel for transmission and reception of
packets.
Note: An input in error does not impact on services being created by the MX8400
Multiplexer that do not use any information from that input.
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