OJ8600 Duplex printing suddenly started jamming on second page

[ZathrasOne]

My OJ8600 Plus suddenly started jamming on the second page of all duplex printing.  I have cleaned all the rollers and checked the page path for jammed bits, but nothing.  The only thing that I noticed is that you can't push the paper through the path by hand from the back of the printer,  so do the guides lift momentarily to let the paper start going through, so there is some sort of signal coming from the duplexer to do that? Any ideas?

[Rainbow23]

Hi @ZathrasOne,

Welcome to the HP Support Community. 

As you have already tried the troubleshooting steps, this could be a hardware issue with the duplexer unit and may need to be replaced. 

I have sent you a private message with the required information to talk to HP Support. 

In order to access your private messages, click the Private message icon on the upper right corner of your HP Community profile Next, to your profile Name, you should see a little blue envelope, please click on it or simply click on this link