Ricoh BR-C1a Basic Service Training page 391

 This machine employs "repulsion bias" (a high negative charge)
to transfer the image from the ITB to the paper.
 The transfer power pack applies a negative bias to the PTR idle
roller [1].
 The negative bias from the back side of the ITB applies a
repulsive force to the toner on the ITB surface. This repulsive
force pushes the toner from the ITB onto the paper.
Slide 391
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Image Transfer Mechanism
391
ITB
Toner
Paper
BR-C1 Training