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agan delivered to the Charged roller thru Charged roller spring(G) and conductive charged
roller bushing(H). The drum surface is charged approx. -200V by the charged voltage.
Also the drum is supplied with -200V of core voltage which is delievered from HVPS to
Drum surface thru Drum supply spring(A) and Drum shaft(B). This core voltage is supplied
for more soft effects on the halftone images, and prevent some duplicated image from the
remaining toner due to any separate anti-static cleaning lamps.
Voltage Supply to Toner Cartridge
The toner cartridge is supplied with voltage in 3 ways. The Developer roller is supplied with
necessary voltage thru Developer voltage supply spring(A), the Add roller thru Add voltage
supply spring(B) and Add roller contact plate() as well, and the Doctor blade thruDB voltage
supply spring(C) and DB contact plate(F) as well.
Replacement of Toner Cartridge and Drum Unit
Drum Unit
The drum cartridge shows an error message "Replace Drum Ctg" informing the user that it
is time to replace the toner cartridge in case the number of print goes over 45,000 sheets
calculated based on the printing condition of A4 size and 5% coverage chart. If it exceeds
50,000, the printing is not possible any more. If the Drum counter can be reset without
replacing the toner cartridge, you can go on printing using the old drum cartridge, but the
printing quality is not gauranteed any more.
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