I have an Epson C70+ Printer (out of warranty) which has developed the following fault: When the paper thickness lever is in the forward (Normal ) position the paper feed fault warning light flashes and it will not print. I have checked several times and there is no paper jammed anywhere that I can see in the printer. However when I move the lever to the Envelope position the warning light goes off and hey presto it prints. Can anyone help me please to identify the problem and how to rectify it? I am quite happy to open it up if necessary.