Dell 1600n has been ghosting lately

The 1600n AIO (all-in-one) is a laser printer. Laser printer use a statically charged "drum" to place toner on the paper. Your ghosting problem may be from the drum itself becoming too charged or simply dirty and not the cartridge. Servicing laser printers is tricky business because they use a lot of wattage/voltage to create the static charge and also "bake" the image onto the paper. A very quick fix would be to de-ionize the drum and clean it thoroughly.

First, make sure you have the unit completely unplugged for, at least, ten to fifteen minutes before proceeding to ensure that all static charge has had a chance to dissopate.

Second, remove the toner cartridge and place it on some newspaper or paper towels. Inspect it for any residual toner and/or damage that may be causing the ghosting (look for cracks/grooves/lines in the cartridge that shouldn't be there).

Third, take a used dryer sheet (or one that's had most of the chemical fabric softener rinsed off and then completely dried) and wipe the entire drum to completely remove any static charge. Then, using denatured alcohol and static-free, lint-free wipes clean the entire drum to remove any remaining detritus. Allow to dry thoroughly before proceeding.

Last, wipe the drum down, one final time, with a clean dryer sheet or lint-free cloth. Reassemble the unit and replace the toner cartridge.

Run a few clean sheets (blank prints or copies) to further remove any particles knocked loose and check for any more "ghosting."

Final printing will be necessary to check for inconsistencies or success.