CASIO FR-101 ELECTRONIC PRINTING CALCULATOR ONLY DISPLAYS E?

The paper roll has ceased to eject and the display only shows E.

New batteries have been fitted. It looks as though the machine has gone into error mode, since it will not display any of the numbers but only E.

Also the paper roll mechanism seems to have jamed

Although this machine is obsolete, it is useful when it works and new ink cartridges can still be obtained from the net