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                                IBM ECA
                    Engineering Change Announcement

   Parts removed from this machine and returned to IBM must be genuine,
                          unaltered IBM Parts

          IBM World Trade Corporation, CE Department Germany
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  ECA number:          ECA016          Service code:      33
  EC number:           EC000000        Parts source:      LOC
  Plant of control:    27              Mandatory:           N               
  Automatic shipment:  N               Date created:      O86/05/02
  Availability date:   85/10           Date last altered: A92/05/18
 
  Abstract:  A 5170, WITH TWO DISKETTE DRIVES INSTALLED, MAY EXPERIENCE
 
  USA=A, EMA=A, AFE=A
 
  PURPOSE: THIS ECA EXPIRES 08/31/92.
  CORRECT A POTENTIAL PROBLEM ON PERSONAL COMPUTER AT (5170) WITH
  TWO DISKETTE DRIVES INSTALLED. SEE DETAIL FOR PROBLEM
  DEFINITION
 
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  Type,                  Machines Affected
  Model,   With          and/or Feature/Device     B/M to be    Service  System
  Stage    B/M           Description               Installed    Hours    Hours
 
  5170     B/M0000000    5170 WITH 1.2MB DRIVES    B/M0000000   00.5     00.5
                         INSTALLED,P/N8286130
 
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  PHYSICAL CHECK:
  NONE
 
  PREREQUISITES:
  NONE
 
  COMPANION:
  NONE
 
  CONCURRENT:
  NONE
 
  DETAIL:
  A 5170, WITH TWO DISKETTE DRIVES INSTALLED, MAY EXPERIENCE
  DISKETTE PROBLEMS ON THE 1.2MB DRIVES.
 
  A COMBINATION OF CHANGING DISKETTES AND ACCESSING THE
  DRIVES MAY CAUSE THE DISKETTE DRIVE CHANGE LATCH TO BE
  ERRONEOUSLY RESET.
  THIS COULD HAPPEN ONLY IF THE USER:
 
  *    HAS DISKETTES IN DRIVES "A" AND "B".
  *    PERFORMS AN OPERATION ON THE DISKETTE IN DRIVE "A".
  *    CHANGES DISKETTES IN DRIVE "A" (DISKETTE CHANGE LATCH
       SET).
  *    PERFORMS AN OPERATION ON DISKETTE IN DRIVE 'B'
       (ACCESSING DRIVE "B" WHICH WILL CAUSE THE DISKETTE
       CHANGE LATCH FOR DRIVE "A" TO BE RESET).
 
  THE NEXT OPERATION PERFORMED ON THE DISKETTE PRESENTLY IN
  DRIVE "A" COULD USE THE FILE ALLOCATION TABLE AND
  DIRECTORY OF THE DISKETTE THAT WAS PREVIOUSLEY IN DRIVE
  "A". THIS COULD RESULT IN THE FILE ALLOCATION TABLE,
  DIRECTORY OR DATA TO BE OVERWRITTEN.                         *
 
  IF THE ABOVE SYMPTOMS OCCUR, INSPECT THE MANUFACTURER'S
  LABEL ON THE REAR OF THE DRIVE. IF NUMBERS PRINTED BELOW THE
  BAR CODE ARE '345XXXXXX  OR 346XXXXXX ' (X'S MAY BE ANY
  NUMBER) AND THERE IS NOT A SECOND LABEL ON BACK OF THE
  DRIVE WITH 'P/N59X7184', REPLACE THE DRIVE(S).
 
  THE 360KB DRIVE IS SOFTWARE CONTROLLED AND IS NOT
  AFFECTED. RECORD ALL TIME AND MATERIAL TO SERVICE CODE
  33, ECA016, OTHER OFFICE 990.                                0
 
  THIS ECA EXPIRES 08/31/92.
 
  NOTES:
  NONE
 
 
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