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1.3.7 Tertiary transfer (IDT 2 - paper)
In the tertiary transfer process, finished toner image formed on the IDT 2 surface is transferred onto the
paper under the voltage supplied to the BTR (Bias Transfer Roll).
✧ BTR is composed in the BTR ASSY. BTR is a conductive roll and receives positive high current from
HVPS. When paper passes through between IDT2 and BTR, plus potential is given to the back side of
the paper so that the toner on the IDT 2 is transferred onto the paper. At this time, potential on the
BTR is higher than that on the IDT 2.
1.3.8 Cleaning (IDT 2)
In the cleaning process, toner remaining on the IDT 2 after the toner image is transferred onto the paper is
temporarily held at the IDT 2 cleaner.
✧ The IDT 2 cleaner is a conductive roll brush and receives positive high voltage from HVPS.
The IDT 2 cleaner is placed in contact with the IDT 2 at a position through which it passes after the
toner image having been transferred from IDT 1 is transferred onto the paper. Remaining toner on the
IDT 2 is electrically scraped and held at the IDT 2 cleaner. The toner held is collected upon completion
of printing or at the cleaning cycle. (Refer to 1.3.11 Cleaning (general).)
1.3.9 Static elimination
In the static elimination process, negative DC voltage is given to the back side of the paper from the Detack
Saw (static elimination board) to neutralize and eliminate the charge of paper.
✧ The Detack Saw receives high voltage from HVPS. The positive charge caused in the tertiary transfer
process generates image quality troubles by scattering toner. Static electricity of the paper is
eliminated by discharge of the Detack Saw preventing those image quality troubles.
HVPS
IDT2
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IDT2 Cleaner
Paper
BTR
Detack Saw
HVPS
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i i i l 0020FA
: Negative electric charge
: Positive electric charge
: Toner