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First you need to know the key operator code, you can display it by pressing [C][INTERUPT] [0/ZERO][INTERUPT][START][START] then the display will shows you the 5 digits key operator.
After you know the key operator code, you can go to User program, this is done by pressing [C][INTERUPT] [C] then input the key operator code, when entry is complete "P" will appear in the quantity display. Input 19 then START, input the new code and press START. To exit user program press CA
To reset maintenance codes requires going into service mode. This should only be done by an authorized trained technician as changing or adjusting something in this mode could create all sorts of problems you dont want to deal with.