Connon Image Class MP730 error ##334
#334 is an eprom error and if turning on and off does not reset it, you have something going on with the main logic board.
http://printer1.blogspot.com/2009/01/canon-multipass-mp730-service-manual.html
Above is a service and repair manual this will assist you to troubleshoot and hopefully repair, although I fear with this type of fault, it needs to be returned to the factory.
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