What must I do to get a measure of how much toner is left in my samsung clp 310?

open the door you will se on your left side is a see trough bottel with toner in.
throug it out and clean it and put it back.

The problem with the Samsung Smart Panel is that it uninstalls itself and the icon disappears and you must then ask the computer to repair it. When the Samsung Smart Panel is not working, of course you have no information about what is wrong in the printer or info about toner levels. This has happened to me three times. This is my third CLP-310/315 so I know what I´m talking about.

Here is the link to the manual, it says that the flashing light is PROBABLY caused by lack of toner and the first step is to replace/replenish the corresponding flashing light to the toner. It explains that when the light turns stys on all the time the toner will be empty.
With regards to the paper jamming, there is 3 pages on things to do or try.

I hope this gives you a few ideas

http://www.samsung.com/uk/function/search/espsearchResult.do?keywords=Samsung+CLP-310&input_keyword=Samsung+CLP-310

open fron door and slide cartridges out, slide new cartridges in, just remove protective tabs from new cartridges and that is all...

We have Zero cost solution for samsung -scx-4300, scx-4824/4828
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ean_inkrefills on ebay. Search on the terms "samsung clp 315 toner refill solution". Chip installs on the printer motherboard--installation is not overly difficult, but still not for the faint-hearted. I expect it voids the printer warranty. Ean gives good email support.

Yeah actually theres "something" about this particular toner cartridges...check this out: http://sites.google.com/site/refillinstruction/Home/clp-310-refill

No need to drill holes. If you turn the cartridge with the drum facing away from you, on the left hand side, you should see a small block elliptical cover with a couple of divider on it. That is the cover for filling the cartridge. The problem is there is no available reset chip yet for clp-315.

Zero cost solution for samsung -scx-4300, scx-4824/4828
ml-2240,ML 2245, ml 1640. clp 310/ 315, Refill cartridge is working for ever. www.nakshatraworld.com