Horizonal banding on Brother DCP-L3550CDW

Feb 2, 2023
I am having banding issues on a Brother DCP-L3550CDW laser printer.

It is used, but new to me. I am using new/full third party toner cartridges. I've tried all the "improve printing quality" steps in the online manual (colour calibration, colour registration, cleaning corona wires, wiping the LED heads).

Text looks fine but I'm getting horizontal banding on any blocks of colour in graphics or photos. There's a sample print here:
The worst lines might be 35mm apart. (But there are lot of other lines, so I might be seeing patterns which aren't there)

Can anyone suggest what to try next?
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