Hi all,
Was really hoping someone can help.
I previously mentioned replacing the diode rectifiers in the psu due to them getting hot.
But it transpires there looks to be a problem with the 5v rail causing it to get hot.
I have Checked both cpu and voice board but I can’t find any issues.
Would anyone know what resistance is ohms I should be getting from the +15 and -15v rail. When I check I am getting 650 ohms. Is that right???
It’s weird because the synth was working then suddenly a few tl082 s went down I replaced them then it keep blowing the psu fuses.
Thanks all.
Measuring resistance across an entire circuit isn’t really anything to go by unless it’s a very low value - ie short circuit. In your case 650Ohm @15V is around 23mA and that wont blow a 1A fuse. When circuits become “active” that is when they start to consume power (ie current) and if any or few components are bad these currents can become excessive and blow that fuse.
So - the first thing to check is the voltages themselves - are they correct? You my have to isolate the PSU to verify that part.
Since this is an older model made out of various interconnected circuit boards each requiring various voltages you can separate each of them to get closer to what is using the excessive current - I would start with the board that had the blown IC’s.
Thank you so much wernersaurus!! Extremely helpful.
I have had nothing but issues with it and you have made everything so much more clear.
Thanks again
I will give that a go