Try contacting East Texas Metal Detectors. His website is:
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www.brokendetectors.com
and his phone number is: 903-734-7773.
He can fix it if it needs it. He also has access to almost any detector manual and sells copies for just a few bucks (meaning around $5 or so).
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http://www.thunting.com/smf/index.php/topic,21320.msg170837.html#msg170837
ArfieBoy