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I have this printer: brother mfc9340cdw It’s not printing right - I don’t know if the rollers are dirty or if something is “clogged” if that happens… but it’s only a couple years old and hasn’t been used enough to just toss….
iFixit does not do repairs. They try to provide you with repair guides and offer tools so that you can do it. The answers are mainly provided by volunteers, both novice and expert. Do your best to explain exactly what is happening with it and one or more of us may be able to help you diagnose it.
vlg517 you did not give us enough information to really help you with this. Download this ==>Brother MFC_9340 SM and check chapter 4 about adjustments etc.
