Possible Problem Solution

Disk assembly problems Disk assembly problems are indicated by the following symptoms:

• Files become corrupted.

• In a system with two NPs, the primary NP appears to fail and the backup takes over. The failed NP might pass diagnostics.

• The system fails to read or write floppy disks. In the case of a write failure, check the write protect switch on the disk.

If a disk problem is indicated, check the disk assembly connector for bent or broken pins. If any pins are bent or damaged, they are the likely source of the problem. Replace the disk assembly connector.

If the connector is in good condition, the problem may be in the disk assembly itself, or in the software on the disk. If you suspect a problem with the software, you should be able to correct it by reinstalling the software as described in the LightStream 2020 Network Operations Guide.

Midplane problems Midplane problems are indicated by the following symptoms:

• A card fails in one slot but operates normally in other slots.

• Data transmission problems do not go away when you replace the FRU8 that appears to be failing, or problems occur in several FRUs simultaneously. (Problems of this type might also indicate a faulty switch card.)

• Failure of a card to fully insert into its slot. This probably indicates damage to the connectors on either the card or the midplane. Inspect all the connectors and replace the card or the midplane if you find damage.

• Electrical failure or electrical problems that do not go away when you replace the FRU that appears to be failing, or that occur in several FRUs simultaneously. Electrical problems include out-of-range voltages.

1 CLI = command-line interface

2 POST = power-on self-test

4 TCS = test and control system

5 NP = network processor

6 NPAC = network processor access card

7 FDDI = Fiber Distributed Data Interface

8 FRU = field-replaceable unit

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