HP Color LaserJet CM6030/CM6040 HP Color LaserJet CM6040/CM6030 MFP Series - S - Page 221
Secondary-transfer-roller unit, Calibration,
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Secondary-transfer-roller unit The secondary-transfer-roller unit transfers the toner image from the ITB surface onto the paper. The ITB motor drives the secondary transfer roller, and the registration motor drives the registration roller. To ensure that the toner image is placed correctly on each page, the DC controller stops the registration motor when the leading edge of the paper passes the vertical synchronous position sensor. It holds the paper in this position until the ITB is in the correct position, according to the ITB perimeter detection, to align the toner image with the paper. When the product is turned on, when it is coming out of Sleep mode, or after a door has been closed, DC bias is applied to the secondary transfer roller. If no current is detected, the DC controller determines that the secondary-transfer-roller unit is not present, and it notifies the formatter. The DC controller can detect when a new secondary-transfer-roller unit has been installed. After a specified number of pages have been printed since a new secondary-transfer-roller unit has been installed, the DC controller notifies the formatter that the secondary-transfer-roller unit is reaching the end of its life. Figure 5-26 Secondary-transfer-roller unit Calibration The product calibrates itself to maintain excellent print quality. It correct color misregistration and colordensity variation. ENWW Image-formation system 175
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