Ricoh Aficio Color 4006, Service Manual

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MECHANISM OVERVIEW 24 February, 1999
1-12
(1) Drum charge
The charge corona applies a negative charge to the OPC drum and the grid
ensures that this charge is even.
(2) Quenching
After cleaning, the OPC is fully exposed to light from an array of red LEDs,
quenching the residual charge on the OPC drum in preparation for the next copy
cycle.
(3) Drum Cleaning
The cleaning brush increases drum cleaning efficiency by applying lubricant to the
OPC drum. The cleaning blade scrapes the residual toner off the OPC drum.
(4) PCC (Pre-cleaning corona)
The PCC discharges the photoconductor drum and applies AC and negative DC to
reduce the charge holding the residual toner to the drum, thereby improving the
efficacy of the cleaning brush.
(5) Belt transfer
Positive charge applied to the back of the transfer belt transfers the toner image on
the OPC drum to the transfer belt.
(6) Paper transfer
The negatively charged toner image is transferred to the paper by giving a positive
charge to the back of the paper while the paper and transfer belt are held in close
contact.
(7) Paper separation corona
After transfer, the separation corona quenches the negative charge on the paper to
reduce the attraction between the belt and paper. The curvature of the belt causes
the paper to separate from the transfer belt.
(8) Belt cleaning unit and lubricant application brush
The brush applies lubricant, which makes it easier for the counter blade to scrape
excess toner off the transfer belt.