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I had the same problem previously. I had a small piece of paper jam in the imaging unit pulled it out and got the Imaging Unit Missing error. I could not solve the problem so I called it in under the extended warranty. Even the printer tech could not solve this issue. But, I look at this file, took off a the side cover moved the gear an viola! fixed..
Hi, I had the same problem. The following Cause and solution may help you fix your machine.
All refereces to left and right are facing the front of the machine as if for normal use.
The cause is due to the connector on thtop left rear of the imaging unit. this connector is mated with a coresponding, retractable connector in the body of the machine. When you open the cover over the top of the imaging unit, this connector retracts back into the body of the machine and when you close the lid it should re-engage with the imaging unit, The problem is that it dosen;t reconnect. I have asumed that it is due wear in the connector operating mechanism. This solution was effective for my printer.
remove the topcover (after removing the colour catridges )and. remove the left hand side panel. You will see a nylon gear mechanism. Sqeeze together the nylon clip inthe centre of the gear wheel, and pull the gear about halfway off. This should allow you to move the vertical geared bar up 1 notch. .Push the gear wheel back on and try the machine to see if it works ok. All covers will need to be closed and if it works ok , reassemle the machine. Job done -about 10 to 15 mins. It tookme alot longer to find it,so some feedback would be appreciated.