If you can get at the board, and the input socket, look first for any loose wires.
Then take a magnifying class or one of the hobby hoods with magnifiers and look very carefully at the point at which the wires connect to the board. It may look ok to the naked eye but might be held on by the rosin/resin of the solder flux or just be a hair-like strand of wire.
Next look at the traces of the contact leads/line on the board and see if any are, or appear to be cracked. If they are it will be a nearly invisible crack. If you see one you can try to use a soldering iron to burn off the epoxy coating (just enough to clear the lead, not melt it) and then drop a small piece of solder over the crack. Or bypass the lead with a fine wire between the contact ends of the lead.
You don't say if it is a passive, or powered pickup system (Passive=no internal battery. Powered =with battery) if powered check the battery to board terminals.
It's unlikely you can repair the board, unless it is an old style of contruction with surface mounted resistors etc. If it is a new composite board with a EPROM chip or such, you can't fix it and will have to purchase a new board.
Most times the problems are the PHONE JACK socket on the body and broken or loose wires between there and the control board.
Last edited on Thu Oct 1st, 2009 08:09 am by theBlackman
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