HP Color 9850mfp Service Manual - Page 71
Drum cleaning (Sub step 1), 5.9 Pre-charging exposure (Sub step 2), Residual toner
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hp Color 9850mfp 5.8 Drum cleaning (Sub step 1) IMAGE CREATION PROCESS A drum that has completed the 1st transfer has a residual amout of toner that is left from the transfer process. The process to remove toner is referred to as drum cleaning. Drum cleaning is made by scraping toner adhered to the drum surface with the edge of a plate called a blade that is made of urethane rubber. I OUTLINE [3] [1] [1] Drum [2] Cleaning blade [2] [3] Residual toner 5.9 Pre-charging exposure (Sub step 2) No toner adhesion is found on the surface of a drum that has completed drum cleaning, but there is a very small amount of residual potential found. Since a normal charging for the next copy/print cannot be carried out as it is, exposure other than a laser exposure is made to thoroughly neutralize a potential on the drum surface. This process is referred to as a pre-charging exposure. This engine conducts this process by using a pre-charging exposure lamp (PCL). [3] [1] Drum [2] Pre-charging exposure lamp (PCL) [1] [2] [3] Residual charge 1-45
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