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