G. Pre-Transfer Charging (step 5)
Figure 2-111
The toner on the surface of the drum is given
AC corona charges with a DC bias to increase its
charging, thereby improving transfer efficiency
while at the same time facilitating paper separa-
tion.
H. Transfer (step 6)
Figure 2-112
Positive corona charges are applied to the
back of copy paper to attract the toner from the
surface of the drum to the copy paper.
To prevent transfer faults or soiling of the back
of copy paper, the transfer guide is grounded
through a varistor.
Reference:
If the transfer guide was directly grounded,
the charges that should be on the back of
paper would escape, causing transfer
faults; if cut off completely, on the other
hand, the transfer guide would be charged
and, ultimately, coated with toner to soil the
back of copies.
In high-humidity condition, partial transfer
failure may occur. In some cases, ground-
ing is wired with leading it through a varis-
tor.
2. COPYING PROCESSES
COPYRIGHT © 1996 CANON INC.
CANON NP6085 REV.0 JULY 1996 PRINTED IN JAPAN (IMPRIME AU JAPON)
2-6
Pre-transfer charging
assembly
Photosensitive
drum
Photosensitive drum
Copy paper
Transfer/separation
charging assembly
Содержание NP6085
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