Canon Service Tool V3400 -v 3.4 0.0 Download- Extra Quality [updated] Direct
Using the Canon Service Tool V3400 requires putting the printer into first. Failure to do this will result in a "Error Code 006" or similar communication failure.
Turn the printer off and then back on to exit Service Mode and resume normal printing. Compatible Models for V3400 Canon Service Tool instructions !... - PrinterKnowledge Canon Service Tool V3400 -v 3.4 0.0 Download- Extra Quality