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Optimax XM6 untruder alarm - can I repair?

My Optimax XM6 seems to have seized up it will not respond to any buttons being pressed at all, it does not even beep.
Could it just need the battery replacing - this was last replaced in 2000. Or is the problem more fundamental?
John P., April 2009
You can't get more fundamental than a 9 year old battery, should have been changed at 5yrs max.

acorn, April 2009
link Click here to see other fixes for XM6.