Will a 16v 1000Ma power supply work with a 9v 850Ma power supply for an electronic keyboard?

I have a keyboard that requires a 9v 850 Ma . I do not have one except for a 16v 1000 Ma from another . Will this work? I thought you can’t go lower, but you can go higher in power? Please help.

The 16 V power supply will damage your keyboard. The voltage must be the same. The mA can be the same or more but the voltage must be the same.

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