Question about Fisher Tw-770 Digital Line Tracer M Scope Detector

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Fisher TW-770 wont work even with new batteries

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If it's the hand held unit, it's likely the battery pack holder, the 9V connector or the wireing to the board. Less likely but possible the membrane switch.
If it's the transmitter, almost certainly the switch, or dirty battery contacts.

Posted on Nov 26, 2014

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