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Re: I have ricoh laser printer aficio sp c420dn showing...
Sc270 is an error with the shutter on the laser unit. Turn the machine completely off and then back on -- if the error doesn't clear, the shutter sensor or motor will likely need to be replaced.
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You just have a problem with colour PCU (SC 365 - magenta, SC366 - cyan). The main reason is that toner density is abnormal. Sometimes, when you replace toners, printer receive to much toner for a short time, and after that you have an abnormal toner density (higher). You can check in service mode (hold up and down arrows for 6-7 sec, release them and press ok button) following thing : choose 2. engine then with arrows choose 3. process then choose Vt display, for each color by default there should by somewhere arround 2.4V. If you see for some colors, for example 0.02V, then this is a problem(to much toner). In this case the only thing that you can do is to restart printer and try to print enough pages, filled with problem color. Usually you can print max 3 pages. Then restart printer and try another 3 pages. Print until the you will be able to print at least 4 pages continuously. Good luck and remember that this is a technical problem and you should ask someone qualified for the job. I am sure that 80% of service engineers can't repair this issue. But I can.
Open left printer cover. Open PCU cover. Pull Magenta, Yellow and Cyan PCU units and check which one has blocked!!! Probably you will need to replace color PCU (type 145). Good luck
sc491 is a high voltage output error. Combined with your jamming issue, it sounds like a possible electrical problem somewhere. A good first step is to turn the machine off and unplug it, then take off the covers and reset any connections or cables you can get to.
If the problem persists, you should have a service technician take a look at it because it might need a board replaced.
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