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Pioneer djm800 keeps blowing fuse J on main processing board. Fitted an anti surge plau to try and stop fault but fuse went again after 10mins use.

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Replacing the fuse to a different rating or type is very dangerous! The fuse is blowing because something has failed and is causing an overload. The fuse is there to protect and stop whatever is causing the problem from overheating the Amp and causing a fire.

Now to what might be causing it to blow. In most cases it's either something in the power supply for instance the transformer or any semi-conductor such as diodes, voltage regulator or what converts the supply from AC to DC.
The other area that will cause the fuse to blow is the main amp section, the transistors etc of which will be found on the heatsink.
If you have an Ohm Meter you can test transistors with it and diodes. In this case it will show up well, for when you put the test probes to the terminals it will be just like you have touched the probes together.

Posted on May 09, 2010

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