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How to fault find on Securitech Active 5 panel?

I disconnected a sensor without isolating the panel. The panel is now dead although the main fuse on the PCB is ok. Can anyone help me with fault finding?
BobT, March 2009
Bob you probably need a 1amp quick blow glass fuse, maplins do them,

John, March 2009
You've blown a fuse, not the Mains one but the one on the circuit board that feeds 12v to the detectors

acorn, March 2009