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AKG K701 - 7th Circle of Hell

post #1 of 10
Thread Starter 

Hey all,

 

One of my phones went out like 3 years ago and I put off repairing them cause I knew that it would be a bitch as everyone mentions.

 

 

I am on holiday now and want to fix them...so...

 

I read through the official manual for taking apart the K701s but it is just too vague or something. I was only able to get the grill off after an hour of work, then I removed the two screws and now I am trying to get the white lid off by squeezing the sides and depressing the latches. It can not possible be this hard. I found the small hole on one side and used that to remove one latch. But there is no access to the other latch. Nothing is working and I am afraid that I am going to break something. How did you all get the lid, part 22, off?

 

 

Help me please!!!

post #2 of 10

Well I just about broke my Q701s thinking that they would have the same build design......boy was I wrong. 

 

The best thing I learned was that to get beyond where you are now, you need to yank part 22 with some force. But first you need to remove the head band. To do that you need to move the two wires that go through the head band. If you are at part number 22, you should see two slits with the "part 1" headband frames sticking out and two red wires attached to them. You need to get a soldering gun with a pencil tip (or something with a really fine tip) and remove those two wires. 

 

Once those two wires are off, "part 1" should be able to be pulled out of the top of "part 22" (be careful that you don't snap the little elastic wires for the head adjust. 

 

At this point the only thing attached to the headphone cup is the two elastic cords for the head adjust. You should now just be able to yank part 22 right out. popcorn.gif

post #3 of 10

The grills are very easy to remove with a small paperclip. Just unbend it so you have two pins pointing down, and fit one inside a hole opposite the grill. Then turn and it pops right off.

 

What is being said in the last post just doesn't make any sense. There is no way you can remove the headband without removing part 22 (called the lid in the manual) and then removing the screw that holds the base of the headband to the pivot assembly.

 

The first time I removed the lid from my Q701 it was a real pain. The hole on one side helps, but they really should have made one on the other side too. If you place a thumb on one side and your index finger to the other, you can squeeze the whole cup, including the part bellow the lid. Place your fingers low, touching the silver ring. Pushing there will unclip the latches. Keep in mind that the lid is clipped to the headband too, so pull it from the bottom up. You can unclip it from the headband once the latches are free.

 

I found that the base of the latches is too wide to fit between the cup and the pivot mechanism inside. This makes the first disassembly really frustrating. One of the latches could not be set free because there was not enough place for it to do so. I had to force it out by twisting and wiggling the lid. Once I figured the cause of the problem, I filled off a bit of this latch, making it real easy to remove again.

 

The outer casing is very soft plastic, and can be damaged easily with metal tools. Be careful if you use something to pry, as it may damage the housing. Also don't tighten the screw of the lid too much, as it'll crack the plastic. Talking from experience here.

post #4 of 10
Thread Starter 

Thanks Kim. That was very descriptive and informative. I can believe that the first time will take a lot of force just like the grill and I know first hand, that metal tools will mess up the covering. I will try this tomorrow.

post #5 of 10
Thread Starter 

Okay! I was able to remove the lids on both sides of my headphones. I resoldered the wire on the far end which came loose. Only problem is that they still don't work. I check the other wires and they all look good. What else should I be looking for so that I can diagnose the problem? What else could be wrong inside my phones? Thanks.

post #6 of 10

None of the drivers work? Or only one side?

 

Have you used an ohm-meter to verify the continuity? It should look like that on the stereo jack:

 

Tip-Ring, 116 Ohm

Sleeve-ring, 59 Ohm

Sleeve-Tip, 59 Ohm

post #7 of 10
Thread Starter 

Where are the drivers located and how do I test them? I only have sound in the left ear. So I guess I'm only looking to trouble shoot the right ear. I haven't used an ohm-meter but I will do that tomorrow. Thanks.

post #8 of 10

by "driver" we means the speakers themselves.

 

When you get your ohm-meter, the first thing to verify is if the driver is not blown. Check the resistance of the speaker directly on the solder pads and see if it reads anything. If not, it's blown. If it's around 60 ohms, it's still good. Also, if you use your meter in the diode mode, you should ear the speaker pop when you test it.

 

If the left ear is working but not the right, the problem could be with the headband. The two metal rods making the headband also conduct electricity from the left cup to the right to power the right speaker. So if everything looks alright in the right cup, the problem could be in the left cup. Check that the wires going to the metal rods are connected.

 

Also, it's possible that the problem is not visible. A wire could be broken inside it's insulation. The only way to test that is to use an ohm-meter. An efficient way to use an ohm-meter to find the problem is to test from point to point along the signal path. This will allow you to pin-point where the signal is broken.

post #9 of 10
Thread Starter 

Okay. I tested it with an ohm-meter and it looks like I have continuity through the headbands. I measured the resistance at the end of the jack and got the numbers you stated. Then I tested the interconnect cable, audio jack to stereo plug, and found one of them had a resistance of zero between the pair. So it must be the interconnect cable which is messed up, right?

 

I just need to buy a new one and I should be good. Thanks for the help.

post #10 of 10

By interconnect cables, what do you mean? The cable going from your DAC to your amplifier?

 

It's confusing when you say "audio jack to stereo plug" because to me, an audio jack is a stereo plug and vice versa.

 

If you measured the right thing and got the values I gave, then the headphone should work fine. This may seem like an obvious question but I have to ask at this point... Did you try the headphone plugged into something else? Tried a different headphone plugged into this...? 

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