A Normal Monoguy

I've got a laser printer, the Fuji Xerox Docuprint 203a. Yesterday morning, while I was printing an important document, I found that my toner light was shown up. I read the manual and it said I have ran out of toner. After I had googled, there were some suggestions to cover a transparent-hold with a sticky paper. I then managed to do so. Here is what I'd done.

After I inserted the toner back in, and restarted the printer again, the toner light didn't go away.  I googled again and I'v found the right solution. Here is what you have to do

You have to move the white switch to the position as shown in the figure on your right.  After I have restarted the printer again, the light was off and the printer has done its jobs since that time. I don't know how long we can use the left over toner but at least I was so happy to finish the document on time.