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aser scanner unit error. Turn off the printer, and then turn it on again. If the same error occurs, turn off the printer, then contact the store you purchased the printer, or a service representative. When contacting the service representative, inform them of the error code displayed and symptoms. Error Code: E100 0000
1 Printer POR Turn the printer off and on several times. If Error Code 900 continues to display, go to step 2.
2 System board Make sure the system board is properly seated in connector J7 on the interconnect board. Turn the machine off and on several times, waiting a few minutes between power on and power off. If Error Code 900 continues to display, go to step 3.
3 Factory defaults Restore factory defaults. See “Restore EP Factory Defaults” on page 3-18. This resets the non-critical areas of the user NVRAM. If Error Code 900 continues to display, go to step 4.
4 Sub error codes With Error Code 900 displayed, press Select and Return. Record the complete list of Sub Error Codes on the display. Check the “Base printer sub error codes” on page 2-6. If none of the Sub Error Codes are listed, then call your next level of support.
Driver could be corrupt. Disconnect the printer or at least be sure it is turned off.
I'd do both and reinstall the CD software program that came with
the printer. When the software program asks you to connect the
printer to the USB port, do so and it should again work properly.
Hope this helps. Bud