NHT - Tweeter repair

[keith_correa]

Unscrewed the faceplate. It came apart without a problem. But the faceplate is not attached to the dome and the voice coil. The plate with the dome and the voice coil is under the faceplate.

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One more shot of the faceplate and the magnet assembly + plate with the dome and voice coil.

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Removed the plate with the dome and voice coil. Came apart easily.

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Voice coil piece

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There is continuity from A and B and from C and D. So the leads to the coil windings are OK. As stated before there is no continuity between A and C.

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This means that there is a break in the windings somewhere. I borrowed a watch repairers loupe from a repairer in our lane and examined the coil closely. There is no break in sight. It looks like there are 2 layers of winding. The outer layer may be OK but there may be a break somewhere in the inner layer which is not visible. Also, there is a brown fluid under the winding. This oozes out when the winding is pressed.
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Now what?

 

[keith_correa]

One more place where there might be a break is the spot where the leads lead up to the coil. This spot is dabbed on with a hard green layer - maybe some lacquer or whatever. Can't see the wires under the lacquer.

 

[GeorgeO]

Check on Ebay for replacement coils for the tweeter-sometimes even such things can be located there, you never know.

 

[reubensm]

Looks like you may have a blown voice coil after all but cannot confirm this. Suspect there may be a break under the green layer as you mentioned. Would require a closer look.

 

[omishra]

Looks like you may have a blown voice coil after all but cannot confirm this. Suspect there may be a break under the green layer as you mentioned. Would require a closer look.

Unwinding one outer turn after de soldering pin and flexible wire could help. Anyway you need new voice coil and one turn doesn't make any difference. See what that green glue is, may be petrol can be applied with tiny paint brush to remove it.

 

[keith_correa]

Fixing or trying to fix this requires better skills than I possess. Since Reuben has some experience in this and since he very kindly has offered to take a jab at this, I will be sending the tweet to him in a couple of days.

In church today, I prayed for my tweeter. Hey, it needs help, okay?

 

[GeorgeO]

Help? I thought it needs a new lease of life..

 

[keith_correa]

Help? I thought it needs a new lease of life..

George, you are right. It needs "help" in it's rebirth.

 

[keith_correa]

So, the tweeter has reached Reuben in Trivandrum and over the weekend he may take a stab at it.

@Reuben - if you do manage to check the tweeter, can you please update this thread on your findings?

 

[corElement]

*visualizes Reuben taking out his knife and stabbing the tweeter and updating this thread with a photo of a knife straight through the tweeter's (annd keith's) heart*

 

[keith_correa]

Lol........