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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.