Try this site:
http://www.printertechs.com/tech/error-codes/error-codes-50-59.php
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51.X PRINTER ERROR
A loss of beam-detect occurred. X description:
1 = Beam-detect error 2 = Laser error
1. Press GO. The page containing the error will
automatically be reprinted. 2. Turn the printer off and then on. 3.
Reseat cables to the laser/ scanner and engine controller. 4. Replace
the laser/scanner. 5. Replace the DC controller.
What works for me was this...
1. removing the board...
2. clean with a toothbrush and alcohol the build up
3. heat carefully the board for about 1 minute (heat gun recommended/medium temperature)
be careful with overheating, my printer stop showing errors...
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