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DT770's DIY Repairable?

post #1 of 11
3/9/10 at 12:47am
Thread Starter 
Hi,

My DT770's recently lost sound in the right can, and since the warrenty is no longer valid I decided to open them up to see if I could see anything wrong. I tested conductivity before I opened them and everything seemed fine so I assumed it wasn't a bad wire.

When I opened them I saw that one of the tiny copper wires that feed into the membrane/driver seems to have broken off. I'm assuming that this is the issue and was wondering if it is possible to fix it myself, or if I just need to buy a replacement part. Cheers.



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post #2 of 11
3/9/10 at 1:52am
Quote:
Originally Posted by Can-Fox View Post
<snip>
My DT770's recently lost sound in the right can, and since the warrenty is no longer valid I decided to open them up to see if I could see anything wrong. I tested conductivity before I opened them and everything seemed fine so I assumed it wasn't a bad wire.
<snip>
What did you test the conductivity on? You should see a resistance between the tip and the sleeve and also between the ring and the sleeve on the connector. I ask because:

Quote:
Originally Posted by Can-Fox View Post
<snip>
When I opened them I saw that one of the tiny copper wires that feed into the membrane/driver seems to have broken off. I'm assuming that this is the issue and was wondering if it is possible to fix it myself, or if I just need to buy a replacement part. Cheers.
<snip>
If that wire is the wire that goes between headphone cable's terminal and the voice coil, then you should see an infinite resistance (as in, not connected) between the ring and the sleeve.

If there isn't an infinite resistance and you're still not getting sound, is the source working okay? If it is, then it's beyond me what the problem could be.
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post #3 of 11
3/9/10 at 10:10am
Yep, you can fix it yourself. Just solder it back onto the metal tab where it came from. Check to see which one. You should be able to see the other side that is still connected.

After doing a series of mode on my 770s, this happened. I was able to fix it and it still works.
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post #4 of 11
3/9/10 at 10:30am
yup, you need some good eyes and you can entirely solder back the tiny wires. I already did that twice
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post #5 of 11
3/9/10 at 5:19pm
The simple answer - no, that wire looks like it's disconnected from the voice coil, not the terminals. Unless you unwind the voice coil a little and get more, you aren't likely to repair these.
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post #6 of 11
3/9/10 at 6:43pm
yay, the jury demands non-blurry pictures.
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post #7 of 11
3/13/10 at 1:24pm
Thread Starter 
Sorry about the delay, I've been insanely busy from school. And sorry about the blurry pictures as well, the camera itself is fairly crappy and trying to focus on that is nearly impossible (doesn't help that I'm a terrible photographer either). The cable itself still appears to be connected to the terminals still, and appears to have snapped just before it goes into the membrane.

Considering I'm relatively unskilled with the soldering iron, I'm thinking I'm going to have to buy a new one, so my next question will be; can I buy that whole part (driver?) as a replacement part, or will have have to buy a new set of cans? Thanks again for the help guys.
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post #8 of 11
3/13/10 at 1:29pm
You'll likely have to buy another, since soldering that wire back together would be extremely difficult, even for those of us who solder a lot.

Call up beyerdynamic and you'll be able to order any driver you like. I just purchased some 250ohm drivers and they were $56 usd each. The 80ohm should be a bit cheaper.
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post #9 of 11
3/13/10 at 2:14pm
from what I was told by the Beyer Pro headphones PM, Beyer always matches the drivers in pair(both impedance and FR-wise)...buying a single driver might lead to unforeseen consequences.
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post #10 of 11
3/14/10 at 3:25pm
Thread Starter 
Ok, thanks for the advice guys, I think I might just go for a new pair and keep these as backup for parts, I figure if I'm going to be spending some more money I may as well just get a new pair with a warrenty. Thanks again.
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post #11 of 11
3/15/10 at 12:29am
Personally, I'd get a pair of 250 ohm drivers from beyerdynamic and install them. I temporarily installed a pair of those into my 770 pro and was very, very impressed with the result. I was sad to take them out. I may end up getting another pair just for them. Otherwise, your pair (and mine) would likely go to waste.

$116 isn't much to pay or the amazing results you'll get. Much cheaper than a new pair as well. You really can't lose.
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