My brother just picked up a Suzuki Omnichord Om-27 at a garage sale and we're trying to make the thing work. so far when we plug it in all we get is a low humming noise. Any ideas about how we could fix it? Our plan is to plug it into a speaker to see if it works then. Any other ideas?
Thanks in advance!
Thanks in advance!
Does pressing any buttons make the hum noise change tone? Do the various volume controls turn the hum up and down?
Are you using the PROPER power adaptor? Correct voltage rating, current rating, polarity, and DC not AC?
Are you using the PROPER power adaptor? Correct voltage rating, current rating, polarity, and DC not AC?
none of the buttons do anything to change the tone. volume controls (master, rhythm, etc) don't do anything to change the tone either.
we figured out that the adapter was not the right voltage rating and found one that was. before the output was lower than what it was supposed to be. The new adaptor only made the low hum louder. We have a hunch that it still might be an issue with the adaptor, since it will turn on, but the light above the on switch doesn't turn on either.
we even tried hooking it up to an amp to see if it was just the speaker, but the hum just went through to the speaker.
Polarity of adaptor?
I don't worry that you might have a 10v instead of 12v DC adaptor, but I do worry that you have an AC voltage adpator instead of DC or a polarity inversion.
If the power supply is OK going in, then your problem is internal. it might be as simple as a blown output stage, a blown internal power supply stage, or something more complex. Any of that will require you to work at the component level inside the machine.
I don't worry that you might have a 10v instead of 12v DC adaptor, but I do worry that you have an AC voltage adpator instead of DC or a polarity inversion.
If the power supply is OK going in, then your problem is internal. it might be as simple as a blown output stage, a blown internal power supply stage, or something more complex. Any of that will require you to work at the component level inside the machine.
The polarity on the adapter is positive. here are the other specs:
input: AC120v 60Hz 13W
output: 9V 700mA
class 2 power supply
OK, just wanted to be sure. Look on the instrument itself, right by the power jack. Does the symbol there show a negative center? I am assuming the picture icon on the adaptor itself shows a positive center? As far as I know all Omnichords have a negative center adaptor. If you are using a positive center, that could be all that is wrong. Hopefully no damage has occurred.
- Status
- Not open for further replies.