Konica-Minolta 2400W is printing very faint.

That could be a problem with either the fusor wire or just need to reset the darkness setting or you didn't gently shake the cartridge (or the toner was exposed to high humidity).

The fusor wire may not be getting hot enough to get all of the toner to stick to the paper and you get the faint page. The fusor assembly is wirth about $240 so you want to make sure if it might be covered by warranty and check the replacement price for the printer. The replacement price might be close to that and you would end up with a new printer with warranty.