22nf 630dc/300ac capacitor inside back left board, i found mine on top of this board, a magnifine glass will help to check the writing on capacitor, replaced mine, works as new, g.knight. uk. ( rs components.)
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Your lucky that fuse was there or you would have blown your output transformer. Unless an amp tells you that it was made for D.I. work you have to have a lload on the outputs, matching speakers with output. 8 ohms is the norm.
There is a small glass automotive fuse that is located inside the unit next to where the power comes into the unit. You can check this fuse to make sure that it is not blown. If the fuse is blown, you can replace it. But chances are that it will blow again. But sometimes it will work for a long while.
Activated protection circuitry means that the amplifier is seeing conditions it does not like and is shutting down the power to prevent further damage. Either you have a short in your speaker wires, in your speakers, or a blown amplifier. Disconnect both speakers and turn on the amplifier. Does it still give the error message? If it does, your amp is blown. If it does not, carefully inspect your speaker wires and their connection. Make sure all looks good and reconnect the speakers and try it again. Still get the error message? You likely have a problem in your speaker cabinet(s).
Hi there get a multimeter place across mains input on transformer,FIRSTLY DISCONNECT AMP FROM MAINS,set your meter to contiuity ,if good you should get a low ohms reading (resistance),then check the secondaries (output of transformer) either 3 wires or four going into amp board..if readings acroos all wires are low ohms then transformer is good if one is open ,transformer has had it ...hope this helps
power down the amp totally to reset processor, then try again. If still no go, may have blown internal fuses- replace and try again
.... or failed thermal fuse in mains transformer. this is a workshop repair as it involves mains voltage that can kill :)