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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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 EC NUMBER         :  ECC72350     DATE             : 91-06-06
 MANDATORY         :  N                             : 91-08-01
 AUTOMATIC SHIPMENT:  N            SERVICE CODE     : 33
 PARTS SOURCE      :  FUJI         AVAILABILITY DATE: 90/05
                                                                                
 PURPOSE:                                                                       
 THIS ECA IS RELEASED FOR JAPAN USE ONLY                                        
 TO PREVENT READ ERROR OF 30MB HDD ASM P/N 90X9403.                             
                                                                                

 Type             Machines Affected                             
 Mod.  With       and/or Feature/Device    B/M to be  Serv Syst 
 Stg.  B/M        Description              Installed  Hour Hour 

 Plant 27                                                       

 5551- B/M0005551 SEE PHYSICAL CHECK       B/M79F5411 01.0 01.0 
  S09                                                           
  T09                                                           
  SK9                                                           
  TK9                                                           
  SL9                                                           
  SC9                                                           
  TC9                                                           
  SD9                                                           

                                                                                
 PHYSICAL CHECK:                                                                
 CHECK PART NUMBER AND LOT NUMBER OF 30MB HDD ASM                               
 FOLLOWING FIXED DISK IS AFFECTED.                                              
      P/N  : 90X9403                                                            
      LOT# : XM,XN                                                              
             (X IS ANY ALPHABET)                                                
                                                                                
 PREREQUISITES: NONE                                                            
                                                                                
 COMPANION: NONE                                                                
                                                                                
 CONCURRENT: NONE                                                               
                                                                                
 DETAIL:  REPLACE 30MB HDD P/N90X9403 WITH NEW P/N95F4087.
                                                                                
 ATTENTIONšš (JAPAN ONLY)
 RETURN THE REMOVED PART WITH COMPLETION REPORT AS SOON AS                      
 POSSIBLE.                                                                      

 NOTES:                                                                         
 THE FBM IS AVAILABLE FOR TWO YEARS.                                            
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