Broken Grado 125i headphones voice coil? Fix - Help
May 11, 2009 at 2:01 PM Thread Starter Post #1 of 13

frogstomp88

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Hello everyone,

I've been getting familiar with DIY headphone fun over the past few weeks. I even made a couple of interconnects (which I will be posting soon). But before I could get to recabling my Grado 125i headphones, the left ear went on the fritz. I open them up and it looks like the copper voice coil is not properly secured... or something to that effect. I do not have any coherent noise coming out of them. Nothing is ripped or separated, but it seems as though something is loose because when you give them a little shake it rattles. Take a gander at the pictures, maybe they'll help...

Any advice is appreciated!


 
May 12, 2009 at 8:17 AM Post #5 of 13
Non-wooden Grados can be taken apart pretty easily. Use the search or use your brain.

frogstomp88, everything is good with voice coil from this pictures. The diaphragm itself are little dented though.
Make the ictures of the other side of the driver, Maybe you've destroyed the constact tips...
 
May 12, 2009 at 7:26 PM Post #6 of 13
Yeah, I might try to pull up the dents with some scotch/masking tape (per head-wize) would that be causing the extreme distortion/ hideous noises I'm hearing. When I shake it, there is sometimes a little rattle or something moving around... Any ideas on what that might be?

I'll post pictures of the other side of the drivers when I get a chance... (they're at home and I'm in my last week at school)
 
May 14, 2009 at 8:12 AM Post #7 of 13
Quote:

Originally Posted by QQQ /img/forum/go_quote.gif
Non-wooden Grados can be taken apart pretty easily. Use the search or use your brain.


rolleyes.gif


I can't ask or what. Everywhere I read people say that taking out the driver is difficult.
 
May 14, 2009 at 9:26 AM Post #8 of 13
Quote:

Originally Posted by yukihiro /img/forum/go_quote.gif
rolleyes.gif


I can't ask or what. Everywhere I read people say that taking out the driver is difficult.



Exactly. I am interested in how you opened it as well.
To the OP, it looks like your diaphragm is dented. That might cause the fritz sound.
wink.gif
 
May 14, 2009 at 6:27 PM Post #9 of 13
Alrighty, that's the first thing I'll try to take care of. I think I can pull out the dents with the tape method...

Steps in taking the drivers out:
1. Remove headband.
2. Heat up cups where the grill slides on. (Blow-dryer or 1/4" of hot water)
3. Slightly file down the black 'bumps' that hold the driver in the inner cup.
-There's about 8 of them, not all need to be taken way down
-I just scraped them with a small straight-edge, good hands and a dremel might do it too
4. With a fine straight-edge screwdriver, gently pry out the driver from the inner cup(the part with the now-filed bumps.
-The cracking sound is just the glue along the inner cup breaking; its okay.
5. Viola
-(Careful not to pull the small pads off connecting the headphone cable at any
point)

Hope this helps anyone who's looking to get inside. Thanks for the advice on my own new project!
 
May 14, 2009 at 10:09 PM Post #10 of 13
Great! I knew you have to open by filing the bumps etc. but I was chickening out when I tried with my cup. Thanks a bunch!
biggrin.gif
 
May 27, 2009 at 10:58 PM Post #11 of 13
So I removed the dents in the diaphraghm... but to no avail, the sound did improve but it is still really distorted.

Any other ideas?
Otherwise they might end up for sale for someone whose looking for a project...
 
May 28, 2009 at 2:19 AM Post #13 of 13
There aren't any... could it have something to do with the copper-colored wire? Have I overlooked something or is this a possible lost cause?
 

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