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How can I fix my Micromark MM9490A?

My burglar alarm has just stopped working. I cannot activate it at all. there are no lights and no noise. I have checked the battery which appears to be ok. Can anyone help please
Roger, January 2012
"I have checked the battery which appears to be ok."

How have you done that?

What is the size & type of battery, charging voltage, current drawn & ampere-hour capacity?

Answering the above tells us a lot.

acorn, January 2012
link Click here to see other fixes for Micromark.