The pwer breaker box cannot be opened because new cables are placed on the box with non-weak tension.
So I couldn't turn OFF the IO chassis in order to add a new ADC board in K1IOO1.
Although it may be possible to eliminate this problem by pulling cables forcefully, NEVER DO SO.
Please remove cables from inside the rack once and then do recabling them in properly.
Anyway, I gave up to add a ADC board today.
