Welcome to Justanswer.com, my name is Dustin.I'm sorry to hear about the issue you are having, I will do my best to help you resolve it.
Sometimes, this issue is caused by stuck paper or debris inside the machine.. And other times, we need to repair or replace parts.
Lets start with following the steps on this page carefully and methodically, as it may cure the issue.
Those steps are for a slightly different model, but they still apply to this situation. Once you have tried these steps Alan, please send a reply and let me know whether this solved the issue, or if you need further assistance.
Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.