Go to this link, and read page 12 .. your error is listed as 51.20 Error 51.21 Error 51.22 Error 51.23 Error The device has experienced an internal hardware error. 51.20 Error-black scanner error 51.21 Error-cyan scanner error 51.22 Error-magenta scanner error 51.23 Error-yellow scanner error Turn off the power by using the power switch, wait at least 30 seconds, and then turn on the power and wait for the device to initialize. If a surge protector is being used, remove it. Plug the device directly into the wall socket. Use the power switch to turn the device on. Laser scanners are not replaceable.
http://www.partshere.com/Models/Q6455A/CLJ_2600nTroubleshooting.pdf
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Having only review the flexible laser, Error 51.21, 51.22-Scanner cyan and magenta, is the flex below this might improperly connected if it was okay before taking it apart. att hp 2600n olivopcenter
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