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5 Clean the portion stained with ink and then install the new pump head in reverse   
  order of the procedures above. 
[Caution]    Make sure to use new O-rings. (2 pieces) 
Be careful not to cause the O-ring to fall off or pinched. 
  Refer to the figures below for identifications of 4 kinds of pump heads. 
 
 
 
 
 
 
 
 
 
 
 
 
6 Reset the pump time to "0" on the “Parts usage time management” screen.