Let me try and do a better job....... This machine is so dreaded awful that it has been discontinued and the reviews are horrid, because of this there is no support. the best solution is typically find someone with it and ask them to share. Never the less I still spent more time looking for it. Because I want you to get what you came here for I did find a solution.
Manufacturer Info
1.800.524.0799
its actually to the point this company does not acknowledge this item anymore and does not offer support.
Then this https://www.cashregisterstore.com/Programming-Manual-in-PDF-Format-for-Royal-310DX.html company says they will sell it to you for money(at your own risk this is not an endorsement )
this looks promising check here https://www.howtomendit.com/answers.php?id=470331
They will be able to get you the information your looking for . I would have contacted this company for you but they are closed. Good luck
https://www.6ya.com/mr.mike
How do change paper in my royal 325cx cash register
How to mend anything Free repair...
SOURCE: Royal alpha 601 sc cash register
Hmm. That is almost NEVER a paper problem, so forget about that.
It is always difficult to diagnose head problems without seeing the machine.
It can be a dirty thermal head, but that's not common unless something has been spilled on it. If you want to try cleaning the head, open the printer, and find the head. It is usually a small aluminium block that clamps against the paper when the printer is closed. it will always sit against the front of the paper. On that block, you will see tiny lines all very close together. They go to a connector at one end, and a thin black line at the top of the head. Wipe this black line firmly with a dry cotton bud.
Here is a picture of a thermal head:
http://www.jarltech.co.uk/ger_new/new/pix/products/web/printhead.jpg
Just above the light brown strip, you can just see the black line. This is what you would rub clean.
Otherwise, make sure the paper is clamping hard against the head while closed. If the clamp is not pressing with the same force at both ends of the head, then you will miss some printing. Try pressing against the back of the paper at the head while it prints, and see if it prints any more than before, then you know if your'e on the right track.
Hope this helps.
Mark.
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