2Nd Transfer Roller Cleaning Control - Konica Minolta magicolor 4690MF Service Manual

15. Transfer section (2nd transfer)
15.3.4

2nd transfer roller cleaning control

• DC positive and negative transfer bias voltages are alternately applied to the 2nd transfer
roller. This allows toner residue on the surface of the 2nd transfer roller to be transferred
back to the transfer belt, thus cleaning the 2nd transfer roller.
• Any voltage for other control purposes is not applied during the cleaning procedure.
• The toner transferred back to the transfer belt is collected by the cleaning blade.
Cleaning blade
A. Operation timing
• The power switch is turned ON.
• The 2nd transfer roller cleaning sequence is carried out after the intermediate transfer
belt has been cleaned during recovery from a media misfeed or malfunction.
• If 100 printed pages or more have been produced after the last cleaning sequence when
the printer completes a print cycle and is then brought to a stop, a new cleaning
sequence is carried out before the printer is brought to a stop.
• The cleaning sequence is carried out when a media size error occurs.
52
Theory of operation Ver. 1.0 May 2008
Transfer belt
2nd transfer roller
HV1
4138to2579c0