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In Reply to: RE: Realistic STA-2000 question posted by Awe-d-o-file on September 03, 2014 at 11:52:15
Just a guess - could the relay be sticking? Check the voltages on it and see if it should be closing. If it's simply stuck, isopropyl alcohol on a thin strip of paper (drawn between the contacts) can dissolve gunk and act as a very gentle abrasive to clean the contacts.
Follow Ups:
Thanks Jon. There was voltage there but it doesn't move. I took the cover off and manually closed it and it blew its main power fuse. Something amiss in the L channel.
ET
So the proection circuit driving the relay detected high amounts of DC and did it's job - that's good!
I'm assuming the relay simply disconnects the speakers in the face of DC at the output. Did you have a load attached when you closed the relay? If you didn't, I'm trying to figure out how closing the relay would give a path to ground (and draw enough current to blow the power fuse). If you did have a load attached, I hope you didn't take out a woofer in the process.
Charles may be right - look at the output transistors, and keep an eye out for anything earlier in the signal path that might have caused an output transistor failure. Without a schematic or the amp itself to look at, it's hard to give much more guidance.
Good luck, and let us know how you make out.
You can try removing the power to one board at a time an see if the relay engages. That will at least tell you which board, and maybe even what channel.
My money is on the output transistors on the driver board.
post your findings.
charles
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