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HP LaserJet 9000dn Service Manual: Internal Cleaning; Figure 23. Remove Power Cord; Figure 24. Remove Print Cartridge

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Internal cleaning

During the printing process, paper, toner, and dust particles can accumulate inside the printer and
the paper-handling accessories. Over time, this buildup can cause print-quality problems such as
toner specks or smearing. Internal cleaning can assist in correction and prevention of these types of
problems.
CAUTION
Before you begin these steps, turn the printer off and unplug all power cords to avoid shock hazard.
1
Turn the printer off and unplug all power cords.
Figure 23.
Remove power cord
CAUTION
To prevent damage to the print cartridge, use two hands when removing it from the printer.
2
Open the front cover, turn the green lever counter clockwise to the unlocked position, and
remove the print cartridge.
Figure 24.
Remove print cartridge
CAUTION
To prevent damage, do not expose the print cartridge to light; place a piece of paper on top of the print
cartridge.
70 Chapter 4 Product maintenance
C8519-90912

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Troubleshooting

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