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How can I fix my Scantronic 9752 K01 Excess Keys?

My electricity supply was cut off (the whole of my village) and when the power was turned back on I have the above error message and my user code will not work. I cannot set my system and my engineer is on holiday. Can anyone help?
Sharon Johnson, August 2011
sounds like the battery is faulty,try key in 1234,thats the default code for user

gts, August 2011
link Click here to see other fixes for Scantronic 9752.