Good answer here:
http://www.mytechtime.com/2011/10/canon-error-e001e002-e003-e007.html
<quote>
How to reset E000, E001, E003 and E007
Canon IR2016, IR2020
Enter the service mode by pressing "additional function" key, "2" and "8" keys in that order. SSSW will display. Press "OK" key.
Change Bit switch 1, bit 0 (might display as the first one on the left using number keys) status, (change 1 to 0 or 0 to 1).
Press "OK" than Press "Stop" or "Additional Function key" to end service mode or restart the machine.
</quote>
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