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Review: ZERO 24 BIT/192KHz DAC/Headphone Amp/Pre-Amp - Page 430

post #6436 of 9242
9/11/08 at 9:53pm
Yep...line level out, do not engage the headphone/preamp ...

Peete.
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post #6437 of 9242
9/11/08 at 9:56pm
I took some pics. Maybe someone will see something wrong that I just dont know. From what I can tell, the main board looks good. I just cant get the volume knob off to see the small one.

It might sound stupid, but how do you get the volume knob off?





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post #6438 of 9242
9/11/08 at 10:03pm
not accusing anyone here... but whats the deal with andrea? who in their right mind would find enjoyment out of creating random accounts just to mess with people about audio parts...
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post #6439 of 9242
9/11/08 at 10:14pm
I just pulled both boards... nothing seems out of the ordinary on either side
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post #6440 of 9242
9/11/08 at 10:23pm
I just put it all back together now I have a loud hum when the volume is low. ****. Im done with it for the night. Right now, If I wanted to deal with this crap, I would have built my own. Thats why I purchased one built so I would not have these troubles....
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post #6441 of 9242
9/11/08 at 10:26pm
Would pressing that button/knob marked 'Reset' do anything at all?

Running line out has the same imbalance as using the head amp, so it isn't something with the volume or head-amp section.
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post #6442 of 9242
9/11/08 at 10:38pm
I tried that and it didnt do anything for me
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post #6443 of 9242
9/11/08 at 10:43pm


This is just my luck. Six years of putting it off and I get a defective unit when I finally break down.
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post #6444 of 9242
9/11/08 at 10:56pm
PP:
I have done testing.
Test phones Sr225 and Denon D2000.
Zero+Sun+2 earth > Duet head phone out > Zero.
The difference is huge compare to them.
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post #6445 of 9242
9/11/08 at 11:02pm
Sorry to hear of that, liquid and falke401, shame that the QC work has been missed on the final assembly stages, it's such a terrific little unit. A hum indicates a short or an earth link is off, generally. I wish you the best with it.
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post #6446 of 9242
9/11/08 at 11:11pm
Quote:
Originally Posted by alxwang View Post
PP:
I have done testing.
Test phones Sr225 and Denon D2000.
Zero+Sun+2 earth > Duet head phone out > Zero.
The difference is huge compare to them.
Details Alex, Details

Is this with the custom reg boards from audio-gd ?

Peete.
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post #6447 of 9242
9/11/08 at 11:19pm
Quote:
Originally Posted by falke401 View Post
I just put it all back together now I have a loud hum when the volume is low. ****. Im done with it for the night. Right now, If I wanted to deal with this crap, I would have built my own. Thats why I purchased one built so I would not have these troubles....
Quote:
Originally Posted by falke401 View Post
I tried that and it didnt do anything for me
Quote:
Originally Posted by liquid steel View Post


This is just my luck. Six years of putting it off and I get a defective unit when I finally break down.
All is not lost, try this , put another opamp in the DAC section....a dual channel opamp and see if the problem is with the 627 adapter, the chip on the top looks skewed on that 627AU adapter, wouldn't be the first time the 627's were faulty with this adapter soldered by hand...it's tough to do with smd devices.

Both of you try this please, we'll get it fixed

Report findings...

Peete.
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post #6448 of 9242
9/11/08 at 11:21pm
I just noticed something....correct me if I'm wrong but isn't the 627 adapter in backwards ? The notch is supposed to point towards the rca jacks and digital ins......not the front faceplate...



Peete.
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post #6449 of 9242
9/11/08 at 11:23pm
Where is the 627 adapter?
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post #6450 of 9242
9/11/08 at 11:26pm
Quote:
Originally Posted by viscosity View Post
not accusing anyone here... but whats the deal with andrea? who in their right mind would find enjoyment out of creating random accounts just to mess with people about audio parts...
The guys has issues, he's a bonifide nutter.

Peete.
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