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Image Transfer Rollers
! Image transfer rollers: A +ve charge pulls toner from the PCUs to
the transfer belt
! ITB bias roller: A –ve charge pushes the toner from the transfer
belt to the paper/
" The PTR is grounded.
Slide 460
# This diagram shows the power pack, the rollers, and the terminals.
# The transfer power pack supplies the positive charge for image transfer to the
ITB and the negative charge for image transfer from the ITB to paper.
# A temperature/humidity sensor under the waste toner bottle motor controls the
amount of charge applied to the image transfer and ITB bias rollers.
# To transfer the images from drum to ITB:
$ The transfer power pack supplies a positive charge (1 kV 24 to 30 µA) to
the image transfer roller terminals.
$ The four terminals charge the image transfer rollers, which transfer the
charge to the back of the ITB.
$ The positively charged ITB pulls the negatively charged toner off the drums
and onto the ITB.
# To transfer the images from ITB to paper:
$ The transfer power pack supplies a negative charge to the ITB bias roller
terminal.
$ The terminal applies the negative charge to the ITB bias roller.
$ The high negative charge of the ITB bias roller is applied to the back of the
ITB.
$ This repulses the low negative charge of the toner, forcing the images onto
the paper.
Transfer Power Pack
PTR
460
Transfer
Power Pack
ITB Bias Roller
V-C3 Training
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