AST RESEARCH, INC.        TECHNICAL BULLETIN # 1138           7-12-96 



TITLE: Ascentia 9XXN Hard Disk Vibration


SUMMARY

   The Ascentia 9XXN system may experience vibration.

   This issue affects all Ascentia 9XXN systems uSing Quantum 500MB 
   hard disk drives, part numbers 230126-500 and 450006-003.


ISSUE

   The Ascentia 9XXN system may experience a very pronounced vibration
   when the hard drive is spinning.  


BACKGROUND

   Faulty Quantum 500MB hard disk drives part numbers 230126-500 and 
   450006-003.


ACTION

   If the Ascentia 9XXN system is experiencing very pronounced 
   vibrations when the hard drive is spinning, and the hard drive is
   a Quantum 500 MB, return the system to an AST Authorized Service 
   Center for a hard disk drive replacement. 


NOTES

   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.

   AST recommends a full backup of all data on the hard drive in the
   computer.

   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.  

   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.

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


TAN 003658RH

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