    AST Research, Inc.      Technical Bulletin # 1297               8/21/95

                   AST Fax/Modem will not send or receive a fax.

    PROBLEM:

    AST Fax/Modem P/N# 202640-xxx will not send or receive faxes.

    CAUSE:

    Component SC11293CQ at location U3 fails "Energy Detect Output"
    in the energy detect circuitry.

    SYSTEMS AFFECTED:

    501693-001    Advantage Adventure  6066d
    501693-014    Advantage Adventure  6066d
    501695-001    Advantage Adventure  6075p
    501695-010    Advantage Adventure  6075p
    501696-001    Advantage Adventure  8075p
    501697-001    Advantage Adventure  8090p
    501714-001    Advantage Adventure  8100p
    501785-001    Advantage Adventure  8120p
    501823-001    Advantage Adventure  8133p

    SOLUTION:

    Using a communication program such as Terminal.EXE. Enter the
    following commands:

    AT+FCLASS=2

    ATDTxxx-xxxx
    (x's represent the fax number)

    If you see:
      +FCON
    +FCSI: " xxx xxx xxxx"
    +FDIS:1,5,0,2,0,0,0,0
    OK

    The fax has passed the first step of the fax handshake.

    If the AST Fax/Modem fails the fax screen test, as mentioned above. The
    fax/modem will need to be replaced.

    CHECK-OUT PROCEDURE

    To verify proper operation of the system upon completion of this change,
    make sure the fax/modem will send and receive faxes.

    NOTE

    Warranty reimbursement for implementing this change requires prior
    AST Research, Inc. approval.