Hi Abdou.
Its difficult to repair the lrl from distance, this must be maken by you.
FG90 has 3 detectors. You must isolate every time the two detectors and let only one to work so to understand where is the problem.
First detector is the receiver on the board FG38679B.
2nd is the ion chamber and 3th is the magnetic receiver at right side of chamber.
For begining desolder the red wire of ion chamber and take out the IC of the magnetic receiver.
Move it to see if you have random beeps.....
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Geo
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