Routine Maintenance Procedures
555-233-123
5-2 Issue 4 May 2002
Handling Control Circuit Packs
PPN Control Circuit Packs
!
WARNING:
It is NOT recommended that you reseat circuit packs unless the
documentation specifically instructs you to do so. If it is required to reseat a
circuit pack, follow the instructions below which explain how to unseat,
reseat, and replace circuit packs.
The procedures for unseating, reseating, and replacing control circuit packs vary
depending on the system configuration. Therefore, before performing these
maintenance activities, refer to the appropriate procedure below.
Procedure for a Standard Reliability Cabinet
To unseat a control circuit pack:
1. Remove power from the PPN. See ‘‘Removing Power’’.
2. Slide the latch pin upward to unlock the locking lever.
3. Pull down on the locking lever until the circuit pack disconnects from its
socket.
4. Pull the circuit pack just enough to break contact with the backplane
connector, but do not remove it from the cabinet.
To reseat a circuit pack:
1. Push the unseated circuit pack back into the backplane connector.
2. Lift the locking lever until the pin engages.
3. Restore power to the PPN. See ‘‘Restoring Power’’.
To replace Control circuit packs:
1. Remove power from the PPN. See ‘‘Removing Power’’.
1. Unseat the circuit pack.
2. Slide the circuit pack out of the slot.
3. Replace the circuit pack as per the following procedure:
NOTE:
If a new circuit pack does not correct the problem,re-install the
original circuit pack.
NOTE:
If you are replacing a TN2404/TN790 circuit pack, refer to
‘‘TN2404/TN790 processor circuit pack’’. You must obtain a new
license file each time you replace a processor circuit pack.
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