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Bad Horn In CS-99A, Can It be Repaired?

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BobHelms

Active Member
Doing a refurb on my CS-99A's. Can't get any sound out of the horn. Ohm meter shows nothing there. Anyway to repair or does anyone make a workable replacement? Pictures attached, Also any opinions on which caps to use and where to get them? TIA for any help.
Bob Helms
 

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It depends on where the break is. What's it look like with the horn removed? You may be able tp repair the break, or even fit a new diaphragm.
 
i did a quick search for a replacement for mine and couldn't find one that fits.4x4 is the closest i could find but if anyone has an answer i would like to hear it.
 
Take it apart, you've got nothing to loose. You'll see the break. You might be able to unwind one lap of wire from the coil and fix it.
 
I concur with PioneerGuy that there are sellers on fleabay who constantly part out Pioneer CS models they acquire at thrift stores and garage sales. Some sellers may not have the most descriptive auction titles (or even know what they have) so you need to broaden your search terms. "Vintage Pioneer Tweeter", or "Pioneer Horn Tweeter" are good places to start. Be creative! (lol)
 
Post a hole size they fit in to- I have a couple of small cellular tweeters around here somewhere! If not I know PE has a 4" square horn tweeter!
DC
 
Here's a picture of the hole size. Basically it's a 4 by 3.75 inch opening for where the horn fits. But as you can see from the inside its oval in shape. I'm going to take the horn apart and see what it reveals. I'll probably need other eyeballs to diagnose the issues at hand so I'll take more close up pictures. Is this horn some kind of freak. I'm surprised no one offers a replacement or a substitute. They obviously break often, does anyone know of a repair service? It's cute but who cares what it looks like once the grill in installed. Does anyone know if this horn used in any other Pioneer speakers? Thanks for the help.
Bob Helms
 

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Personally I would stick with trying to find an original if possible. Replacing them with something else is going to affect crossover freq. and sound quality.

$0.02 :thmbsp:
 
Id be takin' it apart to see if the wire broke near the end..Id even unwrap a few turns of wire from each end and if you find the break, solder it. You wont miss a few turns. Of course if its deeper your screwed. I used to throw out tweeters, until I fixed my first one and Ive done quite a few so far.
 
OK, I took it apart. Pictures attached. I can't see any broken wires. You can blow up the picture and clearly see that both wires are attached to the shinny beads of solder or whatever it is on the back where the terminals are. So now what? I tested this horn using a multimeter and I hooked a small transistor radio to the terminals. No sound and no reading on ohms X 1. Have I overlooked something? Thanks for the help.
Bob Helms
 

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The wire on my tweeter corroded underneath the cardboard washer thingy.
 
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did you ohm test right on the 2 thin leads before the solder?

those wires do look a bit corroded...Ive seen just a hit on the solder with a solder gun till it just starts to melt, cure a driver before.

I would desolder those and lift the thing out at this point, youve nothing to lose

gently pull on the leads till they start to unwrap from the voice coil. Pull off a turn on each side and see if the break is there. If not, its a melt inside and your all done.

If you find a break in the first turn, just pull of enough after the break to resolder to the term and your in biz again.

oh, be careful!
 
They do look corroded, badbadbad. My leads looked like used light bulb filaments. They pretty much turned to ashes prodding them with a screwdriver. I pulled the tweeter diaphram off and the copper wire inside was nice and orange shiny. It was corroded from the cardboard washer out to the solder joints.

The diaphram washer was lightly glued to the basket. Had to gently use exacto knife to pry it up.
 
Thats it! It should be fairly simple to pull the diaphrams and peel back enough shiny wire to get back to the connectors and youll never miss that little bit of wire.
 
Cool, let us know how it turns out. Remember the wire is coated, so lightly scrape to remove the coating before attempting to soldier it back to the terminal. PJ
 
Hi....I'm not the original poster, just have the same problem.

I'm thinking maybe pioneer scraped off the wire insulation too far causing corrosion. I wonder if I should clear coat the wire after i solder.
 
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