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were the drum support brackets removed after purchase? you may need to open the front access panel and remove two brackets that support the drum during shipping. also at the rear are support screws that need to be removed
The main thing you need to do, is to remove the toner bottle assembly, drum unit and developer unit. There is a small black stopper you'll see once you pull out the toner bottle unit. Remove the stopper and the tray holding the bottle will slide out of the machine. The drum unit has a thumb latch on top of the unit and all you have to do is open the right side door, release the lever and remove the drum unit. DO NOT TOUCH THE DRUM! The developer unit is below the drum unit. There is one screw holding a silver piece of metal which secures the unit in place. Loose the screw and fold it down to the left and then remove the developer unit. These steps will keep toner and developer from spilling out into the machine. Good luck.
HP Color LaserJet 2820 and 2840 AiO Series Products - How to Replace the Imaging Drum
Replace the imaging drum
Push the scanner-release button to open the scanner assembly.
Figure 1: Example of scanner release button location
Open the top cover.
Figure 2: Example of top cover being opened
Grasp the imaging drum handle, and then rotate the drum until the handle is at the top.
The drum may be a snug fit. If needed, gently apply some force while rotating and removing the drum.
Figure 3: Example of imaging drum rotation
Lift the imaging drum straight up to remove it from the device.
Figure 4: Example of imaging drum removal
Remove the new imaging drum from its packaging.
Place the imaging drum on a firm surface, and then pull the orange rings to remove the
Figure 5: Example of shipping pin locations
Remove the orange shipping lock on each end of the imaging drum, and remove the two
orange shipping spacers.
Figure 6: Example of shipping lock and spacer locations
Remove the orange cover from the imaging drum.
Figure 7: Example of orange cover location
Do not touch the surface of the roller or expose the roller to light for an extended period of
time. Doing so could cause print-quality issues.
Align the arrows on the side of the imaging drum with the arrows inside the printer.
Figure 8: Example of arrow location
Lower the imaging drum into the printer, and then press it firmly into place.
Figure 9: Example of imaging drum installation
The problem is likely with one of the two fans. A new fan is available from Danby (1-800-263-2629). My noisy fan is the condensor fan located at the bottom rear of the device. After removing the cooler from under the cabinet, the source of the noise was obvious. You will need to tell them whether it is the upper fan or lower fan. Leave the cooler upright for a few hours before you plug it in so that you do not damage the condenser. Price for the fan from Danby is $20.15 including shipping. Users Manual is available at http://www.danby.com/manuals/DWC512BL.pdf -Ron