I have a Brother MFC-L3750CDW printer that I purchased in 2020. For the past month or so, the printer has been producing blotchy printouts, mostly black patches, indicating that it may be somehow related to the black cartridge only. Click here for a sample printout. All 4 toner cartridges are new and genuine Brother cartridges.
Any idea how this can be fixed?
https://printerssetup.org/what-to-do-when-your-printouts-are…
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