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Post by kingunique on Mar 5, 2019 2:24:23 GMT -5
After about 3 years of usage, it appears that the unit finally gave up. The PC fails to recognize dc-1 with the following error:
Windows has stopped this device because it has reported problems. (Code 43)
A USB port reset request failed.At first repeated power on/off solved the problem but now nothing helps. Things done so far: 1. Try a different usb cable. 2. Try several different pc's 3. try different power cables/outlets.
Here's the product serial number if it's of any help (maybe this batch has a known problem) 1201419V011269
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Post by vinylfreak on Mar 5, 2019 6:58:51 GMT -5
After years of frustration trying to connect my DC-1 thru USB to my Windows PC , I finally gave up. I have it connected through optical.
I tried multiple USB ports , multiple USB cables. I even went from Windows 7 to Windows 10 to try and get my DC-1 connected through USB.
It would connect for a few days and then start to drop off then finally I could not get it to connect at all. Windows would not recognize the DC-1. I would also Love an answer to this issue. To my ears my DC-1 sounds much better when connected through USB.
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Post by novisnick on Mar 5, 2019 7:32:43 GMT -5
I never had a problem with my DC-1 and Windows 7 or Mac Mini once configured correctly. Your correct about them sounding wonderful together!
What music format do you utilize?
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Post by vinylfreak on Mar 5, 2019 14:42:11 GMT -5
I never had a problem with my DC-1 and Windows 7 or Mac Mini once configured correctly. Your correct about them sounding wonderful together! What music format do you utilize?
I also stream Pandora and Tidal from time to time |
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KeithL
Administrator 
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Post by KeithL on Mar 5, 2019 14:50:05 GMT -5
The only "issue" that we know of is that the DC-1 is somewhat sensitive to the length of the USB cable you use.
(Cables over about two meters long can be quite problematic.)
Other than that, there are no specific known issues...
Although, of course, the USB interface chip can simply fail...
(And, if so, it would need to be replaced.)
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Post by vcautokid on Mar 5, 2019 20:04:19 GMT -5
Yep that USB cable could be it. I never exceed a meter and I never use anything really exotic either in a cable. Allot of those cables don't work either. Also I never go through a hub, powered or otherwise though some DACs don't care. USB is great but in some cases a pain too.
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Post by kingunique on Mar 6, 2019 1:41:50 GMT -5
1. I use 0.5m usb cable (direct connection between the dac and pc without a usb hub) so I'm guessing it's not the problem.
2. From my understanding the usb controller chip is a c-media CM6631A ?
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bootman
Emo VIPs 
Typing useless posts on internet forums....
Posts: 9,358
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Post by bootman on Mar 6, 2019 8:00:50 GMT -5
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Post by newbluesman on Mar 17, 2019 9:43:06 GMT -5
The USB input in my DC1 stopped working last night. The unit functions fine through all other inputs, but USB is dead to any and all sources (which include multiple Raspberry Pis plus a laptop, a NUC running ROCK, a Beaglebone Black, and a Parasound Zphono USB). I've been using the same (and shortest available) Audioquest USB cable since I got my Stealth new when they first came out, so I tried a new cable without effect. Is there anything I can / should be doing to check it out and possibly get it back up and working? I love this device!! Thanks!
David
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Post by newbluesman on Mar 17, 2019 10:54:10 GMT -5
The only "issue" that we know of is that the DC-1 is somewhat sensitive to the length of the USB cable you use. (Cables over about two meters long can be quite problematic.) Other than that, there are no specific known issues... Although, of course, the USB interface chip can simply fail... (And, if so, it would need to be replaced.) Hi, Keith - If a bad USB chip is the cause of my newly deceased USB input, is the replacement a repair I can do myself? If so, can I buy the part from Emotiva? |
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Post by kingunique on Apr 25, 2019 5:09:01 GMT -5
Sorry to bump an old thread, but maybe someone will find it useful to know that the chip replacement solved the problem for me. I ordered it online and replaced it yesterday. The chip is C-Meida CM6631A. C-Media 6631A
Or here C-Media 6631AI would highly recommend using a desoldering hot air gun with a square tip the size o the ic chip such as this one:  Attachments:
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Post by donmobliano on Apr 29, 2019 19:11:25 GMT -5
For me I lose USB connectivity to my DC-1 after I have my machine powered off for more than about 15 minutes, like to move the computer around or install a new video card. When I plug everything back in and turn it on, Windows doesn't recognize the that there is a USB audio device attached at all. If I let it sit for a few hours it magically detects the DC-1 USB audio device out of nowhere and my audio starts working again.
This started happening to me when Microsoft released the RS5 update to Windows 10, and I have had it happen to both my setups at home and at work (both using a DC-1 connected via USB). I'm guessing the root cause is something in Windows 10 RS5 (1809) and up.
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KeithL
Administrator
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Post by KeithL on Apr 30, 2019 9:31:39 GMT -5
Sorry I didn't notice this question. The short answer is "no". The C-Media chip is readily available, but it's a little tiny surface mount chip, with really tiny closely spaced legs.
Only a really competent repair tech, with good eyesight, and the proper soldering and desoldering tools, would have any chance at all of success. Depending on where you get it, the chip also has to be programmed.... which is not something you - or we - can do before it's installed.
(They sometimes seem to come pre-programmed with firmware that will work... and that part can be done via USB, from an ordinary computer, once it's installed.) And, since somebody asked, no, we are not having any specific issues with any particular batch of these, or with them in general. However, some parts are so reliable they never seem to fail.... and the C-Media chip is unfortunately not one of them. (They're one of those parts that does occasionally die.)
It's also worth noting that, if you have a USB cable, or a USB input, that's "borderline", sometimes a software change will affect the timing enough to "push it over the edge". We definitely have people using DC-1's who have installed the October 2018 Windows 10 update... so, by itself, that hasn't caused any specific problems - that we know of.
The only "issue" that we know of is that the DC-1 is somewhat sensitive to the length of the USB cable you use. (Cables over about two meters long can be quite problematic.) Other than that, there are no specific known issues... Although, of course, the USB interface chip can simply fail... (And, if so, it would need to be replaced.) Hi, Keith - If a bad USB chip is the cause of my newly deceased USB input, is the replacement a repair I can do myself? If so, can I buy the part from Emotiva? |
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Post by vcautokid on Apr 30, 2019 15:37:46 GMT -5
Or powerful lighted optical magnification device. No technician should be without in our SMT tiny teenie world now.
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Post by bredick on Jun 27, 2019 12:16:24 GMT -5
I recently had mine fail for the second time, still under warranty for another year, so maybe I will get it repaired again. I had given up and started running it off the optical output on my pc, but it just doesn't sound as good and my computer won't output all of the sampling rates, none of the multiples of 44100 work with my on-board audio, so that is also annoying. KeithL , any clue why I would see a second failure after a little under 2 years just like the first? Edit: I also just noticed my serial number is quite close to the OP 1201419V011368 |
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KeithL
Administrator
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Post by KeithL on Jun 27, 2019 13:27:03 GMT -5
That's an interesting question... and I don't have a specific answer.
I can tell you that failure of the C-Media chip is one of the more common faults we see in the DC-1. It doesn't go by batches or anything like that - that particular chip just seems to be more prone to failure than many other components. It could be because the USB port is more subject to stress - because it is used to connect two digital circuits - and because it accepts power from two different devices which it sits between. So, if there's any sort of ground issue, or voltage differential between the two, that chip is right in the middle of it.
Or it could simply be that the CM6631 is internally very complex and so is more sensitive to failure.
The Streaming USB input on the XMC-1 uses the same chip - and we've seen relative few problems with those. (However, in all fairness, I don't think proportionally that many people use the USB Stream input on the XMC-1.)
(And, in contrast, MOST people who have a DC-1 are using the USB input.)
I recently had mine fail for the second time, still under warranty for another year, so maybe I will get it repaired again. I had given up and started running it off the optical output on my pc, but it just doesn't sound as good and my computer won't output all of the sampling rates, none of the multiples of 44100 work with my on-board audio, so that is also annoying. KeithL , any clue why I would see a second failure after a little under 2 years just like the first? Edit: I also just noticed my serial number is quite close to the OP 1201419V011368 |
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Post by cfcubed on May 11, 2021 7:49:40 GMT -5
<snip>
I can tell you that failure of the C-Media chip is one of the more common faults we see in the DC-1. It doesn't go by batches or anything like that - that particular chip just seems to be more prone to failure than many other components.
<snip>
The Streaming USB input on the XMC-1 uses the same chip - and we've seen relative few problems with those. (However, in all fairness, I don't think proportionally that many people use the USB Stream input on the XMC-1.) (And, in contrast, MOST people who have a DC-1 are using the USB input.)
<snip> I recently had mine fail for the second time, still under warranty for another year, so maybe I will get it repaired again. I had given up and started running it off the optical output on my pc, but it just doesn't sound as good and my computer won't output all of the sampling rates, none of the multiples of 44100 work with my on-board audio, so that is also annoying. KeithL , any clue why I would see a second failure after a little under 2 years just like the first? Edit: I also just noticed my serial number is quite close to the OP 1201419V011368 Old thread but: - Wanted to thank Keith for acknowledging they see elevated rates of failure for these C-Media USB audio chips (e.g. CM6631A). AFAIK other DAC manufacturers using the chip that appear to have been impacted (anecdotally based on searches) have yet to do so (e.g. Schiit WRT Modi DACs). - FYI it's been found in many cases that heat applied to the chip (e.g. hair dryer) can get it to become recognized/working until de-powered. Rather than pay for replacement, or the tools to do so, I decided to try using a $3 USB warmer dbl-faced taped to the chip as a solution as I described here: ASR Schiit Modi 2 not recognized thread This brute-force hack has been working for several weeks. |
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