The LaserWriter I/O Board has been removed for troubleshooting purposes. The LaserWriter is powered on and the green light blinks. The LaserWriter then tries to generate a test print (as if the I/O board was still installed). After a short time the LaserWriter indicates that a paper jam exists when, in fact, there is no paper jam.
Remove and replace the scanner unit. Review the LaserWriter General Troubleshooting Procedures if the LaserWriter still indicates a paper jam.