bizhub 4700P/bizhub 4000P Service Manual
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6.1.5 Printhead assembly adjustments
Printhead assembly mechanical adjustment
A printhead needs to be correctly positioned after it has been removed. Use a sharp pencil or a small,
flat-blade screwdriver to mark the location of the old printhead on the printer frame. Align the new
printhead relative to the location of the old printhead.
Note: Skew is caused by a sheet being fed through the printer while misaligned. The entire image is
rotated relative to the sheet edges. However, a mechanically misaligned printhead causes the
horizontal lines to appear skewed, while the vertical lines remain parallel to the vertical edges. There
are no adjustments for skew. Check the pick tires for wear, the paper path for obstructions, the fuser for
proper setting, and the tray paper guides for fit to the media.
To adjust the printhead:
1. POR into the Diagnostics menu, and print a Quick test page:
Diagnostics Menu >Print Tests >Tray 1 >Single
2. Fold the printed test page on the left side so that a few millimeters of grid lines wrap around the
outside of the fold.
3. Fold a second vertical fold near the center so that the left side top edge aligns with the right side top
edge.
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