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Dacmagic plus outputs only high pitch noise
Dacmagic plus outputs only high pitch noise
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Old 11th December 2018, 03:53 PM   #1
TheMadcap is offline TheMadcap
diyAudio Member
 
Join Date: Nov 2018
Default Dacmagic plus outputs only high pitch noise

Hello everyone,



I've been using dacmagic plus for about 4 years, however I bought it used so I don't know how old is it. Since last 3-4 weeks it does'nt work properly. When I turn it on and when there is a input signal, it only produces a noise. When it happened for the first time I let it on for 15 minutes and selected an empty input, then I selected my usb input again and turned it off and on. It started to work properly. But when I turn it off again it made the same thing. Now waiting 15 minutes or even longer such as 24 hours doesn't work, it only produces high pitch noise. I tried different inputs as well, usb-PC, optical-PS4, Bluetooth-Phone but the result was same.



So I think some caps went off but I have no idea. If it is something like that I can solder new caps but I don't know how should I tackle this problem. It would be great if someone could help? Thanks in advance.

Here is a video of what happens:

YouTube
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Old 11th December 2018, 04:37 PM   #2
Markw4 is offline Markw4  United States
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Join Date: Jul 2016
Location: California
Sounds like it might be switching power supply noise. You might try measuring the voltages inside and see what you find.

Other than that, I listened to a Dacmagic + once and did not like the sound at all. Depending on what you use if for, you might be well served by just replacing it, IMHO only, of course.
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Old 15th December 2018, 04:26 AM   #3
Extreme_Boky is offline Extreme_Boky
diyAudio Member
 
Join Date: Dec 2003
Quote:
Originally Posted by TheMadcap View Post
Hello everyone,



I've been using dacmagic plus for about 4 years, however I bought it used so I don't know how old is it. Since last 3-4 weeks it does'nt work properly. When I turn it on and when there is a input signal, it only produces a noise. When it happened for the first time I let it on for 15 minutes and selected an empty input, then I selected my usb input again and turned it off and on. It started to work properly. But when I turn it off again it made the same thing. Now waiting 15 minutes or even longer such as 24 hours doesn't work, it only produces high pitch noise. I tried different inputs as well, usb-PC, optical-PS4, Bluetooth-Phone but the result was same.



So I think some caps went off but I have no idea. If it is something like that I can solder new caps but I don't know how should I tackle this problem. It would be great if someone could help? Thanks in advance.

Here is a video of what happens:

YouTube
You can download the circuit diagram from here:

Download the Cambridge Audio DacMagic manuals for free - Hifi Manuals

You did not say what input is in use when you get the noise...? SP/DIF or USB, or both.

If it is on both, the problem is in either the power supply rails (Dc-DC converter chip failing, or voltage regulators failing, and working correctly after they warm-up... maybe a cold solder joins), or the clock signal squaring/buffering/distribution chip failure - U14, 74VHC14.

You could trace the fault quite successfully with an oscilloscope and the circuit diagram...
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Old 16th December 2018, 06:23 AM   #4
TheMadcap is offline TheMadcap
diyAudio Member
 
Join Date: Nov 2018
"I tried different inputs as well, usb-PC, optical-PS4, Bluetooth-Phone but the result was same."

I tried every input I can (bluetooth dongle, optical, usb. I don't have something with coax output)


Easiest thing to do is changing the power supply I guess, but the plug size is a bit unorthodox. If this doesn't work I'll try tracing the fault. Sad thing is opening up dacmagic is not the easiest thing. And it seems like re-assembling it will be even harder.
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Old 20th May 2019, 07:50 PM   #5
cowdogman is offline cowdogman
diyAudio Member
 
Join Date: May 2019
Same problem here. Tried a different amp and different cables--same problem.

This is my third Cambridge Audio product to die suddenly--Sonata CD30 CD player (after 3 years), Sonata AR30 receiver (after 7 years) and now the DacMagic Plus (after 7 years)--in total, probably a couple thousand $$ at the original prices I paid.

When my AR30 died--with a poof of smoke--I contacted Cambridge Audio, and I was advised to send it to a third party repair facility (PanurgyOEM), who would charge me an evaluation fee of $65. I checked out PanurgyOEM and saw it had a bunch of very negative reviews--so I put the AR-30 on a shelf in my workroom, and I'll likely move it to the trash in the near future.

Fortunately when the DacMagic died yesterday I remembered I had a Scarlett that I used previously for recording. It also has a DAC and so I hooked it up--and it sounded great--better than the DacMagic. So the DacMagic will be joining my AR30 in the basement.

I won't be buying any more Cambridge Audio products.

Last edited by cowdogman; 20th May 2019 at 08:13 PM.
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