Agreed. The only time you usually see rocks like that is when the machine's internal temperature is too hot. Did you notice that that particular rock...
C2557 is a developer density code, so yes aftermarket toner would be a big factor. It's probably intermittent. Is the toner hopper binding up? It's a...
You might want to create a user specifically for the device to send with. If you have them use Direct Send that user does not need a mailbox. Direct...
Have you examined FUFM1 & FUFM2? It's not unheard of for fans fill with dust, get out of balance, and to fail. Especially near the fuser. Can you run...
My first guess? There's some blue pen ink on the slit glass that will come off with alcohol or paraffin lamp oil. I had one real estate customer that...