Panasonic UF-5500, Service Manual

Page: 242 / 365

242
UF-5500 / 4500
13.2.5. Cleaning of Transfer Roller
The toner attached to the surface of the OPC drum is transferred to the paper at the transcription stage, but a part of the toner
remains. The cleaning is the stage that cleans the remain toner after the transcription stage. The remain toner on the drum and the
toner which was attached to the place where the laser beam didn't scan are gathered to the developing roller to be used again. After
paper jam or replacing toner and drum cartridge, the transfer roller is plus-charged to eliminate the plus-charged toner.
Cleaning Part
Transfer Roller
Developing Roller
Toner
(plus-charged)
OPC Drum
Surface Pot475V
* Toner moves according to the potential difference.
Transcription Bias DC +785V
+
Developing Bias
DC +170 ~ +240V+AC330VP-P
(depends on the ambience and the lifetime)
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Cleaning Part
Grid Bias
+475V
Charging Bias
+200
µ
A
Constant current
(4.1~4.6kV)