Brand new machine. Installed two weeks ago. Now throwing F2-67 toner supply operation trouble (yellow). Customer was in middle of 100 sets of 4 pages run when code was thrown and cartridge ejected. They had another cartridge installed it. Apparently threw the code again and ejected new cartridge. It will be Monday before able to go see what is going on. Fellow tech at another location told me that Sharp has turned it's cartridge manufacturing over to an aftermarket company and he has gotten lots of bad cartridges. Any thoughts?