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Re examining the prints, I've come to the conclusion that the problem must lie somewhere in the carriage positioning system. As far as I can see the position encoder is the film strip which passes through a sensor on the print head carriage and close...

I have had exactly the same problem for a month or two now, it's not overlayaed all down the page, some time the print is normal, but the next line or two are overlayed. I have done all the maintenance proceedures, all ok. I've had the print head out...