Many thanks for putting your mind to this.
Irrespective of which mode copy /fax /scan /photo I put the printer into the same message 'Put in cartridge' appears. It is only when the computer is linked to the printer that the clicking sound - from around the motor area I would say at best guess...
Hi!
Very appreciative of the photos which you uploaded re. dismantling a MP780. I needed to trace a power problem and succeeded in taking out the PSU. Finally the problem turned out to be in the connection between the PSU and the main circuit board.
Now that I have connected it up together...