HP Color LaserJet 9500 Multifunction Printer series - Manual (Page 213)

ENWW Managing supplies 197
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Replacing the image drums
There are four color image drums: yellow, magenta, cyan, and black. Use this
procedure to install the drums. This example shows the yellow drum being
replaced.
1 Replace the image drum when REPLACE <COLOR> DRUM appears on the
control-panel display. The gauge that corresponds to the used drum blinks.
2 Open the front doors of the MFP and swing the large green lever down.
Note
Before beginning this procedure, you might want to remove your jewelry,
which can snag on parts inside the MFP.
3 Rotate the blue dial up until it clicks, and the image-drum door unlatches.
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