HP M750 series

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Primary transfer roller: The primary transfer bias is used to transfer the toner from each photosensitive
drum onto the ITB.
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Secondary transfer roller: The secondary transfer bias is used to transfer the toner image from the ITB
onto the paper. The reversed bias is applied to transfer residual toner on the secondary transfer roller
back to the ITB. The residual toner on the ITB is deposited in the toner collection unit.
22 Chapter 1 Theory of operation ENWW