Did you move the paper sensor as instructed? Did you make a carrier for the PCB with the correct cutout lenght? These would probably give you a paper jam error if not done correctly. I modded a C88 and it was very easy.
Message
Re: [Homebrew_PCBs] Need HELP Direct to PCB Inkjet print resist (My Epson C79)
2007-05-27 by William Nelson