My sp210 ricoh printer is blinking red lite of middle one marked (!) and not excepting the print command what to do
It means, there is a paper jam. Delete the print jobs in the computer's print queue or disconnect the communication cable (USB or LAN). This is to stop the printer trying to execute print commands. Turn off the printer. Pull the paper drawer and check for a stuck sheet. Remove carefully if any. Open front and rear covers, pull out the toner cartridge and inspect for stuck paper in the paper path. Remove if any. Close the covers, put back the paper drawer and turn on the printer. See if the red light is gone. If not, there still may be some piece of paper or misplaced/broken sensor. If looks normal, reconnect the cable/try printing again and listen if the printer tries to pick up paper. If yes, but red light comes again, then the pick-up roller needs cleaning/replacing. If not, check if the paper size in your document matches the one loaded and set up in the printer. The printer may be waiting for different paper size.