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    AST RESEARCH, INC.          TECHNICAL BULLETIN # 1258                7-24-95

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    ASCENTIA 950N HANGS IN AUDIO FILES

    PROBLEM

    The Ascentia 950N system may hang while playing audio files, or it may make
    squealing noise during power-up.

    CAUSE

    The speaker is not turned OFF during initialization, making erroneous noise.

    SYSTEMS AFFECTED
    AST PART NUMBER AND DESCRIPTION

    501707-XXX      ASCENTIA 950N P54/75 CSS-10
    501708-XXX      ASCENTIA 950N P54/75 CTS-10

    SOLUTION

    Return the system to an AST Authorized Service Center for system board
    replacement (part number 202677-002 revision A or higher).

    CAUTION

    This modification should be performed ONLY by a qualified service technician.
    It is strongly recommended that this change be completed by an AST Authorized
    Service Center.  In no case will AST Research, Inc. be liable for damage to
    the system and its components, or loss of data caused by improper
    modification.

    PREREQUISITES

    A full backup of all data on the hard drive in the computer is strongly
    suggested.

    TIME REQUIRED

    30 minutes.

    STATUS VERIFICATION

    The revision level of the AST system board can be identified by observing the
    revision letter at the end of the nine-digit part number located on the solder
    side of the board.

    TOOLS REQUIRED

    Standard computer tools.

    INSTALLATION PROCEDURE

    Refer to the system Hardware Maintenance Manual.

    Removal and replacement of system "Field Replaceable Units" (FRUs) should only
    be performed according to the installation procedures approved and prescribed
    by AST Research, Inc.

    Remove the riser card according to procedures approved and prescribed by
    AST Research, Inc.

    CHECK-OUT PROCEDURE

    To verify proper operation of the system upon completion of this change,
    follow the setup and test procedures described in the AST User's Manual.

    NOTE

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

    The warranty on this system will become VOID if this change is completed
    by ANYONE other than an AST Authorized Service Center.