NEC UNIVERGE NEAX 2000 IPS, Maintenance Manual

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CHAPTER 2 TROUBLESHOOTING
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NWA-008847-001 Rev.3.0
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(1) Fault Detection by Alarm Indication
When a fault has occurred in the system, you can detect the fault by a Major (MJ) alarm or Minor
(MN) alarm indicated on the AC/DC PWR card, or external Alarm Display Panel.
(2) Fault Detection by Lamp Indication on Circuit Cards
When a fault has occurred in the system, you can also detect the fault by lamp indication on circuit
cards, such as a Major (MJ) or Minor (MN) alarm indicated on the MP card.
“Lamp Indication on
Circuit Cards” shows the alarm indication lamps on each circuit card.
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For details of lamp indication on circuit cards, refer to the Installation Procedure Manual.
(3) Fault Detection by Complaint from Station User or Operator
When you receive a complaint about a problem from a station user or an operator, you should collect
as much information on the problem as possible, and then troubleshoot the problem according to the
procedure shown in
“Troubleshooting by Contents of Complaint” of this chapter.
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FAULT DETECTION