New (manufacturer) toner cart, test p fine, blacks fine, grays waaay too faint

Aug 27, 2017

Test page looks fine.
Black print is fine, but anything that's meant to be gray is too faint.

I'd replaced the toner cartridge a while ago with a reliable knock-off, and the problem continued, so I just got a Brother TN420 cartridge, and still have the problem.

The drum unit has also been replaced, and shows 88% life remaining.

It also seems to me (but I've not rigorously tested) that different fonts, all set to black, print differently – some fine, some faint.

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