HP (Hewlett-Packard) CF081A#BGJ Benutzerhandbuch

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Primary-transfer-roller engagement and disengagement
Depending on the requirements of the print job, the primary-transfer rollers engage with the ITB so it
can receive toner from the photosensitive drums.
Table 1-12
  Primary-transfer-roller engagement states
Roller state
Product state
All rollers disengaged
The home position for the ITB unit 
32
Chapter 1   Theory of operation
ENWW