Hello! I have a problem with my DJ turntable. It has little torque, goes slow (with a little bit irregular speed) and needs even help to run with the finger. I isolated the problem and I know it's in the motor module (I have another working turntable that is the same and tried interchanging modules).
I bought it already broken (very cheap, of course), thinking that it was just a broken fuse... But for some reason that I don't understand, this brand didn't include it to protect the circuit. It didn't turn on, and I suppose they plugged it to 230V in the 115V mode (in the seller's photos I saw it set at 115V here, in my 230V country). I opened the transformer with a hacksaw and found a broken 115 ºC thermal fuse. Now, for testing, I changed it with a 2A intensity fuse and turns on, but the motor doesn't respond well, as I explained before.
It is a Numark tt500 with a brush-less DC 30V motor. As far as I know, its speed is controlled electronically and it seems that the processor controls the motor phase difference (it's a 3-phase one). Also, I found on the Internet a guy with exactly my turntable who had the same problem, so I guess that his analysis helps to find it out (but I don't understand the triangle terminals on his diagram, what are they?) He says that a phase may be lost (that's what I supposed with the irregular speed), but I'm not sure how to find if it's some transistor or some passive elements that it could be broken. Or well... maybe the motor itself, but I hope it's not! I tested the transistors with a multimeter to find if they are shorted, but there is always resistance between its connectors. And no, there isn't any component that is clearly burned, everyone says to my eyes "me? Naah, I'm like brand new, yo!") as you can see in the attached photos.
It only works with the plate on (induction requirements, I presume!)
No tt500 diagram on the Internet (or at least I didn't find it), just the ttx one, a newer model with similar features and some more (like a data screen), but I'm not sure if this model has the same motor (there's a web with spare parts that shows two versions of ttx, one with the same motor and other with the same as the ttx usb, an AC 24V one). I think it is the one with the same motor.
So, my question is: what next step do you recommend? You know, if the problem is just some transistor, resistance or any cheap element, I refuse to pay for another whole motor module, even if it will takes me a lot of work... I'm not in a hurry, I'm ready to learn more about electronics if it takes that
Cheers!
I bought it already broken (very cheap, of course), thinking that it was just a broken fuse... But for some reason that I don't understand, this brand didn't include it to protect the circuit. It didn't turn on, and I suppose they plugged it to 230V in the 115V mode (in the seller's photos I saw it set at 115V here, in my 230V country). I opened the transformer with a hacksaw and found a broken 115 ºC thermal fuse. Now, for testing, I changed it with a 2A intensity fuse and turns on, but the motor doesn't respond well, as I explained before.
It is a Numark tt500 with a brush-less DC 30V motor. As far as I know, its speed is controlled electronically and it seems that the processor controls the motor phase difference (it's a 3-phase one). Also, I found on the Internet a guy with exactly my turntable who had the same problem, so I guess that his analysis helps to find it out (but I don't understand the triangle terminals on his diagram, what are they?) He says that a phase may be lost (that's what I supposed with the irregular speed), but I'm not sure how to find if it's some transistor or some passive elements that it could be broken. Or well... maybe the motor itself, but I hope it's not! I tested the transistors with a multimeter to find if they are shorted, but there is always resistance between its connectors. And no, there isn't any component that is clearly burned, everyone says to my eyes "me? Naah, I'm like brand new, yo!") as you can see in the attached photos.
It only works with the plate on (induction requirements, I presume!)
No tt500 diagram on the Internet (or at least I didn't find it), just the ttx one, a newer model with similar features and some more (like a data screen), but I'm not sure if this model has the same motor (there's a web with spare parts that shows two versions of ttx, one with the same motor and other with the same as the ttx usb, an AC 24V one). I think it is the one with the same motor.
So, my question is: what next step do you recommend? You know, if the problem is just some transistor, resistance or any cheap element, I refuse to pay for another whole motor module, even if it will takes me a lot of work... I'm not in a hurry, I'm ready to learn more about electronics if it takes that
Cheers!
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