Paper Jam I can find no paper jammed in the printer at all and have followed all the instructions in the manual for doing so.......could it be possible that there is still paper jammed somewhere, or that it's lying to me?

Make sure everything is clean. Please refer to your manual for cleaning instructions; or download a new manual at http://www.okidata.com/ .

Below are how to clear a jam instructions:
How to remove jammed paper 28/07/2013
Paper handling is key to Ensure trouble-free printing. However, paper jams sometime Occur.
You can improve feeding and Avoid paper jams in your OKI printer, by following these simple steps:
Loading the Paper: When loading paper, fan the stack of paper before placing it in the tray. This will shake out any paper dust and reduce any static in the paper, two major causes of paper mis-feeds.
- Place the paper in the tray under the tabs.
- Do not fill above the "PAPER FULL" mark.
- Guides Adjust the tray for the correct paper size.
Recommended Media: Use paper specified for the printer
When printing on heavy / thick types of paper, it is best to use the manual feed tray at the front of the printer.This will Provide a straighter paper path to Prevent potential paper jams.
Cleaning: Periodically wipe the rubber rollers inside the area That holds the paper tray with a soft cloth.
dust Paper and simple wear may cause these rubber rollers to slip and not feed the paper properly.

Please follow these instructions every time you load paper and you will never have paper jamming problems.
Make sure that the paper drawer is properly in place. Do not load paper of an irregular size into the paper drawers. Do not load the following types of paper into the paper drawers. Doing so may cause a paper jam. - Severely curled or wrinkled paper - Thin straw paper - Transparencies - Paper which has been printed on using a thermal transfer printer (Do not print on the reverse side of this paper either.) Fan the stack of paper well before loading it. Never place paper or any other items in the empty part of the drawer next to the paper stack. Doing so may cause paper jams.
Also to clear paper jam if you have the manual with you follow it OR you can go to this link and download the manual. It is equally applicable ti ir2270
http://download.canon.it/manuali_operatore/files/iR4570_USR_ENG.pdf

First try this. Turn off the printer, remove all the cartridges, drum, open all the doors and remove all the trays. Now verify that there's no actual paper jam by exploring through the inside of the printer. You can use a blower to blow any dust or pieces of paper, etc.. from the printer. Now use the manual feed and put in thicker paper several times (push in and pull out). Again reinstall and reconnect every components and boot the printer. If the actual printer's paper sensor isn't broken or stuck or twisted, this will definitely clear the paper jam message on the printer.

If the problem persists, please download this small text file and follow the instructions (click here). Open the link, click "Download Now" button, wait for 20 seconds and again click "Download File Now" link and read the instructions and follow step by step.

Good luck.

Thanks for using FixYa.

Here are the instructions for resolving a carriage jam (and a paper jam) on the Officejet 7310.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00304007&cc=us&lc=en&dlc=en&product=391182
I am an HP employee. I do not represent HP on this site.

If you follow the instructions in this video, it'll solve your problem or tell you that your printer is broken.

Follow the instructions in this video. If you follow those instructions and still get the message, you may need to replace your printer or the rear door.

Hi
The manual is available in this site .....Follow the direction from it to access the paper path .....

http://www.fixya.com/support/p360581-canon_multipass_mp730_all_in_one_inkjet/manual-10204

you need to remove the jammed paper, you may need to take the printer apart as much as possible to get it all out, the manual generally has instructions on clearing a jam do you have the manual do you need it?

usually it means that a sensor in your fuser is bad. If you have a P.M. Kit replaced the fuser and clean the printer.

but before you do, make sure that you have cleared all jams, including in the fuser.

Its probably time for a Preventive Maintanence