Have you lost power, or is the platter rotating abnormally? If there is no power, it's the power supply that needs to be replaced. If it's acting funning, then some components on the main drive PCB are damaged. In either case, professional help is highly recommended.
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You could probably run it off a large 9 volt battery, as long it doesn't run off a 6 volt supply. How much control of the speed depends on if the deck has inbuilt speed pre-sets to adjust it. In fact that is crucial for any power source that you use. As it will either be too high or low to run the turntable at the correct speed. So if there are no pre-sets on it you will have build that in to the power supply. It all depends on if the original power supply in the unit it was attached to had it controlled from there.
I would have a look at the motor in the deck, it might tell you what it runs on.
Once you find the voltage the motor runs off, you can narrow a suitable power supply down. For example if it ran off a 12 volt supply, you could use a model train set transformer. As basically the motor is nearly the same as train set motor! But must run off about 9 volts that I have seen.
It's probably belongs to a system. However you can use a 12 volt power supply to work it, if you are any good at electronics. It will probably use a 12 DC supply. There might be two presets for the speeds one 45 one 33, these will need to be adjusted with any other power supply. You might find them on the underside of the turntable. A look inside (take off the bottom) will give you clues to the kind of power supply it uses. For example you might need to add a electrolytic capacitor to smooth the supply if the power supply you use isn't already smoothed.
That switch is the mains voltage selector and you friend just switched it the USA voltage setting! So it sent 230 volts to a device inside your deck which only takes 115 volts! If it doesn't come on when placed back on 230 volts, then if you are lucky a fuse might have blown! Check the one in the plug, then take the bottom off the turntable and see if you can see one inside. If your not lucky it might have destroyed parts of the power supply of the turntable, perhaps the transformer. And if your in a country that uses mains of 220 to 250 volts turning that switch to 115 is the self destruct with that power applied!!!
sounds like dodgy internal cabling u need a volt meter to check between cartrigde and main outs also have you checked if you have an output from cartrigde on both channels you will need to swap leads on bak ov cartridge itself but b carefull pins are delicate
are you running phono pre amps ? are you running pre amps to each deck or one for both decks , if you are running pre amps maybe the power supply is not sufficient to run two decks anymore [ possibly damaged ] but it sounds like a power delivery failure to me . hope this helps
hi, please if you can open the turntable unit ,go on the part of power supply please double check the fuse first...maybe that is the solution for your problem...find the supply section ... you can find it from the AC plug going to the deck end..u