Brother HL-4000CN Service Manual page 94

2) Refresher and HTC
High voltage of the polarity (negative) reverse to that at the printing transfer is applied
to the IDT1, IDT2, and transfer roll cartridge. At this time, the drum surface is
charged negatively by negative voltage of the IDT1. The toner (positive polarity)
remaining in the Refresher and HTC are move to the drum electrically by
transforming the Refresher and HTC to 0V. Then, in the same manner as in the
printing transfer, the residual toner is collected to the transfer roll cartridge surface by
potential difference between IDT1, IDT2, and transfer roll cartridge.
Toner attached to the surface of transfer roll cartridge is scraper off with the transfer
roll cartridge cleaner which is in contact with the transfer roll cartridge and collected
into the collection space in the transfer roll cartridge unit ASSY.
HTC
-
Drum (Y)
Refresher
HTC
Drum (M)
-
HTC
Drum (C)
-
Refresher
HTC
Drum (K)
HVPS
-
Refresher
-
-
-
-
IDT1
-
-
-
-
-
Refresher
-
-
-
-
-
IDT1
-
-
-
-
-
-
-
Fig.3-23
III-16
-
: Negative electric charge
: Toner
-
-
-
-
-
-
IDT2
-
-
-
-
-
-
Transfer
-
Roll
-
Cartridge
-
-
HVPS
Scraper
HVPS