Error Code E075-004 on a

ok
go to menu then settings and reset all settings to defaults frist.
Clean all ink toner cartrdges.
also check in menu you find service mode .

As i mention eairler this should work..

You have to get in to service mode. Press the "*" botton once then the numbers "2 & 8" togather, then the "*" botton once and the screen changes. On the top of the diplay touch "Funcation" then "CLR" 2nd colum 3rd one down, then press "ERR" hi light it in blue then press the "OK" on the bottom right of the screen and turn the main power switch OFF on the right side and see if it was cleared. If not you may have a bigger problem

If not contct canon

http://www.usa.canon.com/consumer/controller?act=ContactCanonAct

Thanks
Kevin