Reseating and Replacing Circuit Packs
Issue 1 May 2002
4-7555-233-143
Reseating and Replacing Circuit Packs
Most repair procedures involve replacing faulted circuit packs. In some cases,
problems are resolved by reseating the existing circuit pack. Reseat a circuit pack
only when explicitly instructed to do so by the documented procedures.
Reseating is discouraged since it can put a faulty component back into service
without addressing the cause, resulting in additional and unnecessary dispatches.
After reseating a circuit pack, make sure the problem is really fixed by thoroughly
testing and observing the component in operation.
When a port board is removed from the backplane, no alarm is logged for about
11 minutes to allow for maintenance activity to proceed. After that, a minor
on-board alarm is logged. If the port board is not administered, no alarm is
logged.
!
WARNING:
This procedure can be destructive, resulting in a total or partial service
outage.
!
WARNING:
Proceed only after consulting and understanding the applicable service
documentation for the component.
!
WARNING:
Observe all of the ‘‘Safety Precautions’’ beginning on page 4-2.
!
WARNING:
If the amber LED on the circuit pack to be removed is lit, the circuit pack is
active, and services using it will be interrupted.
!
WARNING:
Follow special procedures for the following circuit packs.
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