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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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*** OBSOLETED ***

 EC NUMBER         :  ECC72350A    DATE             : 91-08-01
 MANDATORY         :  N                               93-07-01
 AUTOMATIC SHIPMENT:  N            SERVICE CODE     : 33
 PARTS SOURCE      :  FUJI         AVAILABILITY DATE: 91/06
                                                                                
 PURPOSE:                                                                       
 THIS ECA IS RELEASED FOR WORLD TRADE USE ONLY                                  
 TO PREVENT READ ERROR OF 30MB HDD ASM P/N90X9403.                              

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

 Plant 97                                                       

 5502  B/M0005502 SEE PHYSICAL CHECK       B/M79F5411 01.0 01.0 
   S01                                                          
   S11                                                          
   T09                                                          
   TC9                                                          

 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.                               
 ATTENTION!!(JAPAN ONLY)                                                        
 RETURN THE REMOVED PART WITH EC COMPLETION REPORT AS SOON AS                   
 POSSIBLE AFTER EC INSTALATION.                                                 
                                                                                
 NOTES:                                                                         
 THIS FBM IS AVAILABLE FOR TWO YEARS AND USED ON 5551-S/T MODEL                 
 TOO.                                                                           
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