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Dust cap removal help

car421

car421

Member
This is my first time trying to repair a broken tinsel and need to remove the dust cap. I tried heating the glue up to loosen with a hair drier and that did not work. I have seen others say to use acetone or to cut it off and glue back when done. Which is the best route? This is a woofer from a Pioneer CS-88A and I am already keeping my eyes open for a replacement but would like to try and repair if possible.

Thanks
 
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The easiest solution is to cut the dust cap off and then replace it with a new one, this way you don't have to cut too close to the cone and worry about damaging the voice coil leads or the cone itself. But if you want to maintain the original look then acetone is probably your best bet (although I don't know how well it fares with decades-old adhesive). There are other solvents that have been mentioned here as well.
 
swechsler said:
The easiest solution is to cut the dust cap off and then replace it with a new one, this way you don't have to cut too close to the cone and worry about damaging the voice coil leads or the cone itself. But if you want to maintain the original look then acetone is probably your best bet (although I don't know how well it fares with decades-old adhesive). There are other solvents that have been mentioned here as well.
Click to expand...
A toluene based solvent works well (I used it for replacing surrounds) but it is VERY important to use it outside or a well ventilated place because of toxic fumes.
 
Acetone has worked well for me. Once you get the glue to soften a little, use a dental pick or similar tool to slowly work your way around the dust cover.
 
I cut the cover off and unfortunately I don't think the speaker is repairable. Thanks for the replies. Wishing I bought the replacement I saw on eBay last week as it is no longer listed.
 
Having trouble trying to post pic. I cut the dust cap off and the tinsel is not accessible as it goes behind what I assume is the voice coil.
 
I don't see any damage there. What is wrong with the speaker? If it is just a loose wire you should be able to repair.
 
The tinsel is on the backside of the cone (it's usually fully exposed, but not always that easy to get to). The leads going up the side that were under the cap are the ends of the voice coil.
 
the tinsels solder on where the lumps are on the 2 black lines of goo .right next to where dust-cover sticks on ..
you need to carefully scrape the black stuff off the lump to reveal the solder joint and then test with your meter whilst gently moving the coil up and down .. it will change value whilst doing this but should never read open circuit .
 
So right now it will go open on the meter when moving up and down. I have to move the tinsel in one direction to get it to not read open. The tinsel goes in the side of the cone and then up the voice coil and adhered on the top. I can not see the tinsel once it penatrates the cone. So it is possible it is just the connection where the black stuff holds it in place?
petehall347 said:
the tinsels solder on where the lumps are on the 2 black lines of goo .right next to where dust-cover sticks on ..
you need to carefully scrape the black stuff off the lump to reveal the solder joint and then test with your meter whilst gently moving the coil up and down .. it will change value whilst doing this but should never read open circuit .
Click to expand...
 
on the topside just where the lump is is where the tinsel wire solders to the fine voice coil wire .. scrape away the black right on the lump to reveal the soldered connection .
 
For future reference

P5200004.jpg
 
Sorry for not getting back sooner. I should have some time this weekend to work on this. I'll let you know what I come up with.
 
petehall347 said:
on the topside just where the lump is is where the tinsel wire solders to the fine voice coil wire .. scrape away the black right on the lump to reveal the soldered connection .
Click to expand...
So I scrapped away the goo on both leads and narrowed it down to which one goes open. I then worked my way under the wire and now with a slight bend in the wire near the solder joint the lead no longer goes open. Seams strange that just putting some tension on the lead by bending it would take care of the issue. And I did verify that both leads read fine. I now get 8.2 ohms between the 2 and that value changes when I move the cone but does not go open.
 
petehall347 said:
the tinsels solder on where the lumps are on the 2 black lines of goo .right next to where dust-cover sticks on ..
you need to carefully scrape the black stuff off the lump to reveal the solder joint and then test with your meter whilst gently moving the coil up and down .. it will change value whilst doing this but should never read open circuit .
Click to expand...
See info on last post.
 
so it looks like you found the break then .. just needs fixing now .. maybe its as simple as adding solder to the break ..
failing that a new tinsel wire should fix it .. it can be a bit fiddly i know ..
 
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