IBM 3112 Service Manual page 27

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Error Code
979 Network Card 2
990 Duplex Option
991 Duplex System Card Failure
993 Duplex Comm. Failure
Explanation
General network 2 card software error.
Verify that the network card is installed
and grounded correctly. If this error
returns after a POR, there is a software
or microcode incompatibility problem. Do
Not replace the card. Contact your next
level of support.
Duplex error. See "Duplex" on page 17.
Duplex system board failure. Replace the
duplex system board.
Communications between the duplex unit
and the printer have failed. See "Duplex"
on page 17.
Diagnostic Information
11

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