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Post by hlevinson on Sept 6, 2017 13:47:01 GMT -5
Well I got my unit back and it worked for about 5 minutes. The unit went back into fault / protection mode with all 3 status LEDs showing red. I was able to power the unit down and restart it. Now there is no sound at all coming from any of the channels. I emailed Emotiva support today and I am sure it will have to go back for more repairs. Sounds like something shorted internally to trigger the fault protection. Just curious as to what they found was the issue the last time it was in for service? At least you can be confident that your issue will eventually be solved as their customer service is pretty awesome. the last service replaced both fuses (T10A fuse). they were both shorted again.
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Post by hlevinson on Sept 6, 2017 13:47:54 GMT -5
It took them two visits to figure out my ERC-2 issues as well. Hopefully second time is the charm. Hoping Emotiva is willing to pay for the return since the problem wasn't solved. At the same time I am just wondering why it took you two weeks since getting it back from the first service call to follow up? i was away on vacation and this was the first opportunity i had to use it.
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Post by bolle on Sept 6, 2017 14:58:17 GMT -5
Sounds like something shorted internally to trigger the fault protection. Just curious as to what they found was the issue the last time it was in for service? At least you can be confident that your issue will eventually be solved as their customer service is pretty awesome. the last service replaced both fuses (T10A fuse). they were both shorted again. I hope they did more than this. A fuse shortens for a reason, just replacing fuses means not digging deep enough and ignoring the real problem which caused the fuses to shorten. Good luck with the future analysis and repairs!
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Post by leonski on Sept 6, 2017 18:30:45 GMT -5
A VERY minor point but Fuses do Not 'short out'. They go 'open'. A short has very very Low resistance. Perhaps even <1 ohm. When this happens, current flow goes VERY high and can damage other stuff than what caused the 'short' in the first place. The fuse is IN SERIES with the load and current thru the fuse is limited by what the load draws. Sizing the fuse to the load is important. A 10 amp fuse on each leg of the amps PS? Good. A 1 amp fuse for a preamp? Might even be too high! Perfect example? You wire your speakers. ONE tiny filament of wire goes from terminal to terminal. When you turn the sytem ON, you have a short across your speaker terminals. VERY high current flows for a brief instant. Maybe your fuse or other protection circuitry 'catches' this fault, but more than likely you'll destroy some output transistors or burn up some bias resistors or even melt some traces / wiring on the circuit board. The power supply wont' like you, either. Kind of depends on current supply capacity of the PS and how long the current flows. BTW, that little wire? Probably evaporated and you'll never see where it WAS. An open has infinite or extremely HIGH resistance. Either it won't read or will be off-scale high. A functioning fuse acts more like a short. But not quite. A fuse has very very low resistance which makes heat. When too much current flows for whatever reason, the internal wire gets HOT and melts 'open' stopping current flow. If this happens quickly enough (sometimes it doesn't) it mitigates other problems and damage to a circuit. And more than you need or want to know? Some fuses are Slow Blow where they'll take a current overload for a short time before popping. :More than any SANE person needs to know about fuses: www.littelfuse.com/~/media/electronics/product_catalogs/littelfuse_fuseology_selection_guide.pdf.pdf
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Post by hlevinson on Sept 8, 2017 12:14:49 GMT -5
so an update. i was on the phone with Emotiva service rep yesterday trying to deduce what the problem is. We went through several scenarios where I replaced the T10A fuse, then ran only channel #1. Within 10 minutes the fuse blew. I replaced the fuse and tried it with only channel #2 running, same result. Replaced the fuse and did it again for channel #3, same result. Then ran one more test with nothing hooked up at all and the fuse blew again. So it does look to be some type of internal issue where current is being drawn and shorting the fuse. Just awaiting an answer from Emotiva about the next steps.
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Post by bolle on Sept 8, 2017 14:51:27 GMT -5
leonski: Thank you, you are obviously right. I just took the word from "hlevinson" and didn´t think about it any further.
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novisnick
EmoPhile
CEO Secret Monoblock Society
Posts: 27,223
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Post by novisnick on Sept 8, 2017 15:29:42 GMT -5
so an update. i was on the phone with Emotiva service rep yesterday trying to deduce what the problem is. We went through several scenarios where I replaced the T10A fuse, then ran only channel #1. Within 10 minutes the fuse blew. I replaced the fuse and tried it with only channel #2 running, same result. Replaced the fuse and did it again for channel #3, same result. Then ran one more test with nothing hooked up at all and the fuse blew again. So it does look to be some type of internal issue where current is being drawn and shorting the fuse. Just awaiting an answer from Emotiva about the next steps. So very sorry to hear of your troubles, 😢 This sounds like an 🕺 Elvis Song, Good luck
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Post by leonski on Sept 8, 2017 17:09:27 GMT -5
I hope EMO gets to 'root' on this. All this downtime would be driving me even crazier than I AM. And does a 24 hour burn-in AFTER the fix to verify.
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Post by hlevinson on Sept 8, 2017 19:02:33 GMT -5
i just got an email from Emotiva that they are sending me a return label so that it can go in for repairs again.
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Post by simpleman68 on Sept 8, 2017 19:46:04 GMT -5
i just got an email from Emotiva that they are sending me a return label so that it can go in for repairs again. Good deal. Will be nice to have her fixed up and back home doing her proper duties again. Scott
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Post by hlevinson on Oct 16, 2017 10:32:12 GMT -5
just got an update from Emotiva:
Replaced relay board (PbXPA), resoldered loose connection to input voltage indicator, tested amp on Audio Precision analyzer and burned in 24 hours.
Hopefully that fixes the issue, we shall see.
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Post by leonski on Oct 22, 2017 15:17:50 GMT -5
Any UPDATE? 2nd fix the charm? I hope EMO techs got to 'root'.
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Post by hlevinson on Oct 27, 2017 18:09:49 GMT -5
it arrived about a week ago and i have done a few listening sessions and all has gone well so far. glad it is fixed but it took about 3 months from when the issue started to get it sorted out.
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