We've been experiencing the same problem with our CM4540. I've replaced the scanner control board, the little board the sensors plug into on the ADF, the interconnect board, formatter board & HDD, and the dc controller. I'm stumped... What else could it be???
It's quite frustrating to have such an expensive printer from HP and replace countless parts without resolution.
Anyone from HP willing to assist?
We've spent countless $$$ purchasing printers for our University... Please help me out here...
Thank you.