MX-6240N, MX-7040N (serv.man145). REMEDY FOR TONER DEVELOPER DISPERSION AT PROCESS UNIT SECTION - Sharp Copying Equipment Technical Bulletin (repair manual). Page 4

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Instruction
1.  Adhere ②Dispersion protection seal F PO on ① Process Frame AS.  (Make sure that a-a' / b-b/  c-c' are attached to each other.)
  *Clean the surface with alcohol.
★②Dispersion protection seal F PO
Adherence of Disperson Protection Seal F
a' Reference position 
    for edge of round 
b' Reference position for edge of round 
+0.5mm 
+0.5mm 
C' Edge surface 
Make sure the seal  won't protrude from the edge. 
After 
+3.0mm 
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