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If it in good condition and the seller is offering a fair deal, especially considering your daily output, it could be a good option)

Try power cycling, checking connections, updating firmware, and ensuring consumables are correctly installed

In the Sharp Series 4 models, there is a menu to adjust the developer density. You can find this option in the settings menu typically under the maintenance or calibration section

Since you've already replaced the printhead and maintenance cartridge, checked for leaks, and cleaned the purge unit, there could be a possibility of air entering the ink lines or issues with the ink...

Ive had a similar issue before. In addition to checking the HVPS, make sure to inspect the toner cartridge and imaging unit for any issues. Clean the printer thoroughly to remove toner dust. If the...