System Down Fault - NEC Univerge SV8500 Operation And Maintenance Manual

1.4 System Down Fault

Fault Status
Unable to define the fault reason
Faulty circuit card is displayed on the System
Message
Localizing the fault
Specific information for fault localizing proce-
dure
1.4.1 When Cannot Define the Reason of Failure
(1) Checking the power supply circuit card
(a) Check the power supply of the load side (DC: -48 5V) on the AC/DC PWR circuit card.
(b) Confirm the NFB (Non-Fuse breaker) of the PWR circuit card is switched ON (placed upward).
(c) Confirm alarm lamp of PWR supply is turned ON.
(2) Initialize the system. (Office data/program load initialization) (Refer to Chapter 2 of this manual)
[When station to station call is available]
Data in the memory may have been temporary corrupted. Continue to monitor the system.
1.4.2 When Circuit Card With Failure Is Indicated on System Message
Fault status
• Change the circuit card when detailed message data about the circuit card was displayed.
(1) Change the faulty circuit card
(a) Turn the MB (Make Busy) switch ON (upward), then pull out the circuit card.
(b) Adjust the key setting of the replacement circuit card to the faulty one.
(c) Turn the MB (Make Busy) switch ON (upward), then insert the circuit card to the corresponding slot.
(d) Turn the MB (Make Busy) switch to OFF (downward).
(2) Confirm that station to station connection is available.
System Down Fault Status
When Cannot Define the Reason of Failure on page
541
When Circuit Card With Failure Is Indicated on System
Message on page 541
Fault Repair/Localization Flow on page 542
Details of Fault Repair/Localizing Flow on page 546
– 541 –
CHAPTER 4 Fault Repair Procedures
Reference