My 3070CW makes the same noise. It is caused by the transfer belt. One roller is driven by a cog and this goes fine. The other roller has a tensioner and this roller is making all the noise. While the noise is really loud and annoying - it is completely harmless. Hope this helps.
SOURCE: When I print with my bother 1450 hl laser printer, the printer ma
Hello sir; Before we go further I suggest you replace a new cartridge see what happen.
SOURCE: Printer makes grinding noise and not printing
sounds like the rubber band in side the printer has jumped a tooth which is why it is grinding bud have it repaired or get another
SOURCE: Lexmark C510 is making grinding noises while printing large jobs
I found another posting stating that the culprit was the black toner cartridge. Sure enough I changed our black cartridge and the grinding noise has stopped. No wonder the grinding noise was not happening all the time only when the black cartridge got low. Thanks for the help!
SOURCE: My Dell 2135cn printer all
Refer to the service manual in disassembling the device.. Clean it thoroughly then try it again.. If, you have no experience in doing so, hire a qualified tech to do so.
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