Image Transfer And Paper Separation; Pre-Transfer Lamp (Pal); Image Transfer - Ricoh FT4430 Service Manual

IMAGE TRANSFER AND PAPER SEPARATION

PRE-TRANSFER LAMP (PTL)
After the latent image is developed but before the image is transferred to the
copy paper, the drum surface is illuminated by the pre-transfer lamp [A]. This
illumination reduces the positive potential on the drum surface. This prevents
the toner particles from being re-attracted to the positively charged drum
during the paper separation process. It also makes image transfer and paper
separation easier.

IMAGE TRANSFER

The registration rollers [B] feed the copy paper through the transfer entrance
guides to the transfer section. A high positive voltage (+5.6 kilo volts) is
applied to the transfer corona wire [C], and the corona wire generates
positive ions. These positive ions are applied to the copy paper, and the
positive charge attracts the negatively charged toner away from the drum and
onto the paper. In addition, the paper is held against the drum by the negative
counter charge on the drum.
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