Topic: ADI 2 Pro FS Overload/Short Detected

Hello,

I've been having an issue with my ADI 2 Pro FS that I don't fully understand and hope someone can help me with.

First a quick description of my setup:

PC Mainboard native USB > ADI 2 Pro PH 3/4 > Sennheiser HD800S with included unbalanced cable

Firmware/Drivers are up to date


The issue I have is that when I turn on the DAC and listen to music/watch videos/play games I will get the Overload/Short Detected warning message after about 3 hours of use every time. At that point I have to turn off the DAC and back on. However, the device is quite hot to the touch at this point and if I immediately turn the device back on it will only take a few minutes for the same warning message to re-appear. If I choose to wait for 5-10 minutes before turning it back on then I will be able to use the DAC for about an hour before getting the error. If I end my computer session for the day and return on the next day I will be able to use it for 3 hours before the error message appears.

This is inconvenient for me because I tend to use my PC for 6-8 hours per sitting, meaning the first three hours are fine, but then I need to turn off the DAC every hour, wait 5-10 minutes with no sound/music playing until I end my session.

I don't really understand what causes this problem although if I had to take a guess it seems overheating related, but I'm really not sure.

Does anyone know what causes this issue and how I can fix it? Please let me know if you need me to provide more information.

2

Re: ADI 2 Pro FS Overload/Short Detected

Please return the ADI-2 Pro FS for service or exchange. The phones output is malfunctioning, causing both the heat and the shutdown.

Regards
Matthias Carstens
RME

Re: ADI 2 Pro FS Overload/Short Detected

MC wrote:

Please return the ADI-2 Pro FS for service or exchange. The phones output is malfunctioning, causing both the heat and the shutdown.

Oh I see. Thanks for the quick reply! Should I contact the merchant or RME itself in this case?

4

Re: ADI 2 Pro FS Overload/Short Detected

The merchant.

Regards
Matthias Carstens
RME

Re: ADI 2 Pro FS Overload/Short Detected

MC wrote:

The merchant.

Got it, thanks!

Re: ADI 2 Pro FS Overload/Short Detected

Hello,
I have the same problem here - with 3/4 phones and HD800s sennheiser headphones (Lo-power mode)
@LucidTurtle : did you replace the adi? Is the problem solved?
Thank you.
Best.

Re: ADI 2 Pro FS Overload/Short Detected

dctl wrote:

Hello,
I have the same problem here - with 3/4 phones and HD800s sennheiser headphones (Lo-power mode)
@LucidTurtle : did you replace the adi? Is the problem solved?
Thank you.
Best.


Hey,

Curious to find someone else in the exact same situation, but I'm happy to share my findings with you.

After making this thread and reading the replies, I sent my Adi in for repairs and got a new one. I've been using it for two months now, averaging about 6 hours of use every day on Hi-power mode with the HD800s connected. The unit has never once overheated, or short-circuted or anything. It works flawlessly and it gets way less hot than the previous unit did.
I can't say for sure that the problem won't occur again eventually, but the older device started exhibiting problems after using it for only one month so maybe it was just faulty.
But so far everything works just as it should.

8 (edited by dxmat 2019-07-10 09:48:27)

Re: ADI 2 Pro FS Overload/Short Detected

Same problem here.
I sent back my brand new ADI2 Pro FS as warranty.
Now I wait for a solution.

dxmat

RayDAT, ADI-2 Pro FS, UCX

Re: ADI 2 Pro FS Overload/Short Detected

Me too, only in summer in Rome. Probably the ADI is not climate change ready :-)

10

Re: ADI 2 Pro FS Overload/Short Detected

Could be a solution:
https://static.wixstatic.com/media/ea57 … _1534.jpeg

11 (edited by dxmat 2020-01-06 17:28:37)

Re: ADI 2 Pro FS Overload/Short Detected

Mine is back from assistance.
The motherboard has been replaced and now it works well.
The heat is always high. (my room temperature is now 28 ° C = 82.4° F)
I use a very silent fan by Noctua to keep the temperature more acceptable.

dxmat

RayDAT, ADI-2 Pro FS, UCX

Re: ADI 2 Pro FS Overload/Short Detected

I am getting the overload error message with my six-month old ADI-2 DAC.  In contrast to the problem described above, the problem with my ADI-2 DAC cropped up while the unit was still cold. 

Now, if I touch anything to the 1/4" jack (I've tried three pairs of headphones and a bare adapter), I get the error.  Powering down the unit, unlpugging, updating firmware, switching from high-power to low-power mode, and taking all other steps I could think of have not resolved the problem.

My kind and responsive dealer, Nice Cans of Austin, TX, is investigating what can be done...

https://lh3.googleusercontent.com/h2TUpixFNTBzG1H5g9F99hxopEpDy1IArnm3AVulALRws4LY6aGjxe4X0fqtzREvlfl23D5d4PQod24MmGPthw-rKYEPENvwvTq5_hcvtG_P-mOnSJ3ccscbYf22XCVF-4yER14PFDJYTOQ844tJ0vEGBBOJnB2vRvuXiAuEJfzokJT1yEI4Y4uBDdNy_runF70qgR0yzdXVrxOTyHXIoHQeaj8VY0FrWf8WfnOSYfY3i0-6GxftBX1ty3zw99gMjpYAf7GAvwIbieH7tB2rzhx1_nmsK7jOczoflPjLaNDosV7QLk5ZrSc1IrADWw6-FfTq2VLWnJhvk92XhtU1GsrQvvmvpgIQj7KxGSY_ibB2E9rEri5E0dd1WjwhIxQ409CPL_iQMDXEPoaT_N01D0VNOGdhPmOFYWxIvU7UHRzPRkDnkA37TGS_4F_tUE-fRtEAe53Z5WuGYX_RKVlT6YykwKS7zJi5de5VXE--w8LrgIWujLxX9eqGYNbEYrTEN1KuINy5D2eYdlTXe4F6csWxT_NBA-B680EUfJhCyCpHCqNSStLv8TcCDZqn1q4Q6lpC_lZEm3OUzQmZngAE_pBlayUmp22ogGH4uDIr4WB94vQVR-K-eQeV5ibgdY-3Rhk624Ey72Mq0JBo9iYbt4f4PGt6QYPFAPLe9hITTJdf8MNAatvDs3xUPzHx8ive3BBOOtKcWrMMq8xXkCOqZGiphBEXn9p37kMyHQPc23T5q8Fl=w1072-h804-no

Re: ADI 2 Pro FS Overload/Short Detected

Ah, I have the same problem now after a year, as the weather gets hotter. It’s now 28C here. I was using my 300ohm HD600 in low gain With volume at -30db. 2.5 hours later it displayed such message and the entire body is untouchable.

Is it because of a bad batch of components?

I will try 1/2 hp out tomorrow and see if problem presents there as well. As far as I remember it’s equally hot as 3/4.

14 (edited by KaiS 2020-06-19 21:45:54)

Re: ADI 2 Pro FS Overload/Short Detected

Had the same problem, appeared suddenly after I had ADI-2 Pro for a longer time.

Turned out that one of the 3 paralleled OPA1688 of one headphone amp's channel was broken.
Nothing that can be serviced DIY, the chip's thermal pad is really hard to solder.

So, this type of error makes the ADI-2 a candidate for factory service.

Re: ADI 2 Pro FS Overload/Short Detected

KaiS wrote:

Had the same problem, appeared suddenly after I had ADI-2 Pro for a longer time.

Turned out that one of the 3 paralleled OPA1688 of one headphone amp's channel was broken..


I doubt if that is the case. Yesterday HP 3/4 shutdown after 2~3 hours running at 28C ambient temperature. Today I tried HP 1/2 and after less than an hour of using at 27C room temperature. the unit display the overcurrent message and runs extremely hot. I almost never used HP 1/2 before, and having issues with both HP outs should be extremely rare...

Running low gain at -30db for 300Ohm headphone shouldn't stress the HP out that much.

16

Re: ADI 2 Pro FS Overload/Short Detected

KaiS is right. Send the unit in and it will be taken care of.

Regards
Matthias Carstens
RME

17 (edited by ning 2020-06-19 16:36:51)

Re: ADI 2 Pro FS Overload/Short Detected

MC wrote:

KaiS is right. Send the unit in and it will be taken care of.

Thank you MC. Just shipped my unit back to the dealer. You'll receive it soon.
oh btw, don't forgot the price https://forum.rme-audio.de/viewtopic.ph … 86#p154486!

Just curious,  is it because those opamps fighting each other which leads to shorter lifespan? (based on online picture I assume the outs are directly summed together without a resistor. the 47.0s seems to be feedback resistor?) No intention to criticize the design. Just want to learn more electronics knowledge.

18 (edited by KaiS 2020-06-19 21:41:59)

Re: ADI 2 Pro FS Overload/Short Detected

No, this "fighting" wouldn't work.
The 6x47Ω per channel are the summing resistors.

The 3 OPA1688 (= 6 amps total per side) are running as voltage follower at unity gain, feedback resistor = 0Ω.
There is an overall feedback loop over the OPA1688 stack including the 6x47Ω's, bringing the final output impedance from 7.8Ω down to ~0.1Ω.

This way the 6x47Ω serve as load balancers, current limiters and to improve the linearity of the OPA1688.


If one of the OPA1688 channels breaks the "Overload/Short Detected" warning is triggered at relative low output level.

I hadn't investigated how the detection works, didn't need for my fix.

Re: ADI 2 Pro FS Overload/Short Detected

Thank you KaiS, I learned a lot!