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Help me troubleshoot my Beyerdynamics: Do I have a dead driver?

post #1 of 3
Thread Starter 

I have a pair of Beyerdynamic DT 770s from a few years back. The left side no longer produces any sound. I opened them up to see if there was a loose wire. They're wired just like the ones in this guide (the left wiring connects to a tab on the right driver before splitting off). Here's what I found:

  • Tip to right (working side) positive: zero resistance

  • Ring to left (non working side) positive: zero resistance

  • Sleeve to right (working side) ground: zero resistance

  • Sleeve to left (non working side) ground: zero resistance

  • Sleeve to right (working side) positive: zero resistance, slight pop in speaker [this part confuses me]. The same happens if I connect the left ground to the right positive.

The Y where the wiring splits off to the left (non working side) seems fine, too.

As far as I can see, the tiny wires under the driver tabs have not become detached.

Here's a photo of the drivers, with the wiring as I understand it.

tl;dr - One side of my headphones doesn't work, but the drivers on both sides seem to have a solid connection to the plug. The + terminal on the side that does work seems to have a connection with the sleeve, though ... is that normal?

post #2 of 3

Yup totally normal.

When my vintage DT990 started to get a crackling driver, the problem was a break in the cable just before the entry into the headphone.


I had to clip the cable just below the entry point and re-solder.

The only problem I had after this was that one side was shorter than the other, so I put some of the longer cable into the headphone to give each side equal length. 

post #3 of 3
Thread Starter 

Gotcha, thanks for the reply. I was really hoping my problem was just a loose wire, but it seems more and more likely that it's not. :(

 

[edit] - BTW, I have these 250 ohm models: http://www.amazon.com/gp/product/B000F2BLTC/ref=oh_details_o00_s00_i00?ie=UTF8&psc=1


Edited by codytoshiro - 10/18/13 at 10:12am
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