This guy don't know what he is talking about,the cdj800 does have a fuse,if you open the unit up just make sure it's unpluged,if the fuse is blown replace it with one of the same rating,it's right next to the switch inside the unit,it's very easy to take apart just 5 screws,I have one that won't power on also but it's not the fuse,but yours could be,just check it out and don't be afraid just be careful when handling electronics so that you don't send static charges into the chips.
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Downtown Radio was one of my Authorized Service Centers when I worked for Pioneer. They are no longer in business. The issue that Nathan is having, is quite different than a loss of power or ground, caused by an bad IC Protector, which is merely a complicated fuse. Unfortunately, I think you damaged the Optical Pickup(laser) when you installed it. This part, as well as most parts in this unit, are ESD sensitive and without taking the precautions, that pickup may be useless now. For more information, please visit my website at audioserviceclinic.com. You may contact me directly through the website. Thank you.
Not true! CD channels don't require a pre-amp and the cartridge for a turntable does. I suspect that when the power went off the mixer was still on, so that when power was restored it came back on. However this resulted in a surge inside the unit. Magnetic cartridge pre-amps are often very sensitive to this kind of thing and will sometimes fail, while everything else works fine. This would result in no sound from the record decks, but sound from CD players etc.
The step down adapter should work fine as long it supplies the voltage and any other ratings shown on the turntable power supply indication pannel. However the problem might already have happened. If the fuses were before the power entered the mains transformer of the unit, then if they were set to blow above the USA voltage then things could be OK. However if the the fuses were in the secondary output from the transformer then the mains will have caused possible damage to the transformer. Maybe even elsewhere.
You can have a fuse problem only in you plug it diectly to 240V, the UK voltage. Check that the converter is a step down transformer, 240 to 110 volts. The system should work with 110Volts. If everything is ok, then you blew the system´s powersupply with the 240Volts. that is difficult to solve.
when removeing top cover you will see the power supply on top right side faceing you.there are fuses on that board. Some of the fuses will look like transistors, however will only have two legs,check all. chances are you may have one or more bad.
You need to check internally, Transformer/rectifier could be bad, disconnected wire, blown internal fuse. Can you rub the needle with your finger and get sound? Is it just the table not turning or is the needle not getting "power" either?