Why won't my Amp power up?
I have an A500 Behringer power amp that will not power up. I replaced the power cord and fuse with known working ones, with no result. Next, I took the fuse I tested in it and plugged it back into a working amp of the same model, which ran fine (so I know the amp isn't just killing fuses).
(I would have put this as a comment, but needed more words. I would have edited my original post, but couldn't upload pics on an edit.) Every once in a long while, the lights on the front of the power amp will light briefly and then die, but 98 percent of the time, nothing. I have opened it up, and here is the power path:
There is the plug/fuse combo:
As you can see, there is a green/yellow ground. There is a black wire that goes straight into the heart (massive heavy cylinder of wires) of the amp. There is another black wire with a capacitor (I think?) directly after the plug. This wire goes to the switch in the front, which is a simple push button. There is a blue wire coming out of the switch back into the heart of the amp, completing the circuit.
The rest of the components (led board, input boards, output boards, volume knobs) seem irrelevant because it's not getting power at tall (but I could be wrong). Here's a pic of the entire setup:
Any ideas? I am not an electrician, so please use small words :)
Questa è una buona domanda?
It sounds like loose ground wire.
Well ur not dealing with dc here so a loose ground wouldnt normally be the problem a loose neutral would b more like it but honestly id hav to look at it to tell u for sure but i would take a multimeter and check fir voltage u hav the right idea follow the curcuit from power source untill u find the loss of power then when u find where ur loosing power u can sesrch for the issue at that point if mits a bad part or a loose wire u can find the issue wherever u loose power
da Adam van beurden
Hi Ben, and thank you so for your spiritual encouragemant.
I don't have an answer, but question. I have a Sherwood amp connected to TV, PS3, etc. It continues to play but when turning up the volume the whole system shuts down/turns off. Before, I could turn the volume up to about 45 or so, now if it goes past 19 (in which makes it hard to hear many movies) it will cut completely OFF! Please Help :)
You most likely are invoking the protection circuit to prevent power from damaging the rest of the unit or your toroid is open. Good news is the partial schematic your unit is available online. I'd start with testing the output of the "Heart" (Thats a toroidial transformer) It looks like the yellow and orange pairs feed the side boards. disconnect those, put meter on ac and test for voltage. maybe 15-20 volts AC should be found there. careful.... risk of shock is real! Also, disconnect power and start checking continuity all the way up to the switch from the power cord, till you get to the toroid/transformer.
Does the amp have a charger dc input? ive got a 800w amp thats runs on AC and DC. It started to hum but not power on using the AC home plug. I had a dc charger lying about 12v 3a so i thopught id try it. Worked like a dream, powered up and i now have my sound back. Just a thought.
da Andi Sadler