Gliderguy3 Posted December 8, 2020 Share Posted December 8, 2020 I have a pair of Klipsch SW-112 subs, and one started blowing fuses upon plugging in. I did some digging around and found what looks like a blown ceramic or tantalum cap. It has some kind of green shrink wrap over it, so I don't know the capacity or size in order to replace it. Can anyone figure it out from these images? The label on the circuit board says TH3, and there is a TH4 elsewhere on the board slightly larger, and again wrapped with some kind of shrink wrap so I cannot see any color codes or specifications on the component. Quote Link to comment Share on other sites More sharing options...
Blvdre Posted December 8, 2020 Share Posted December 8, 2020 It looks like a varistor (MOV), used to shunt excess current if the voltage climbs too high. Something took it out, maybe a big line surge. Not sure what the PN is. Quote Link to comment Share on other sites More sharing options...
001 Posted December 9, 2020 Share Posted December 9, 2020 @ngen33r ... Quote Link to comment Share on other sites More sharing options...
Gliderguy3 Posted December 10, 2020 Author Share Posted December 10, 2020 UPDATE: It does appear to be a varistor or an inrush limiter. I was able to get it unsoldered from the board and can read SCK, 104, 947. It was very faint, and part of the markings were damaged with the meltdown. I did some digging around and found that these are sized by diameter, and mine is about 13mm. I think I also learned that the 104 means 10 ohm nominal resistance and rated for 4 amps. That makes sense with the protective fuse rated at 3.15 A (weird size, but it is on both the fuse and the holder) I don't know about the 947, I couldn't find any reference to that. So if I find any 250 volt, 10 ohm, 4 amp (or greater, looks like 5 and 6 are available) varistor I should be good to go, or are there other critical specifications? I see that there is a secondary ohm spec for once you have reached the breakdown voltage, but it is like 250 milliohms, and different tolerance ratings. It seems these are designed to be sacrificial to protect the rest of the components, so I am feeling better about my chances of reviving the sub. I also figured out that the lead spacing was either 7 or 7.5 mm, and appears to be 0.8mm diameter, (some higher rated leads are 1.0mm diameter) Now I just need to find a source that will let me buy just one or two (in case I somehow screw up the first one) Most of the websites I found while researching want to sell in batches of 50 or more. Quote Link to comment Share on other sites More sharing options...
ngen33r Posted December 13, 2020 Share Posted December 13, 2020 The 104 is an Inrush Limiter https://www.datasheet4u.com/datasheet-pdf/Voltts/SCK-104/pdf.php?id=675090 https://www.digikey.com/en/products/detail/epcos-tdk-electronics/B57211P0100M301/2781797 If that is blown 99.999% of the time your fets are toast too as well as some other passives. Quote Link to comment Share on other sites More sharing options...
Peter P. Posted December 13, 2020 Share Posted December 13, 2020 Digikey sells in small quantities. Quote Link to comment Share on other sites More sharing options...
henry4841 Posted December 13, 2020 Share Posted December 13, 2020 8 hours ago, ngen33r said: The 104 is an Inrush Limiter https://www.datasheet4u.com/datasheet-pdf/Voltts/SCK-104/pdf.php?id=675090 https://www.digikey.com/en/products/detail/epcos-tdk-electronics/B57211P0100M301/2781797 If that is blown 99.999% of the time your fets are toast too as well as some other passives. I agree. You will probably go down a deep rabbit hole trying to fix the problem. I hope I am wrong but not my experience. Cheaper to just install another D amplifier board inside your old plate. Plenty available on Ebay and other sources. Mouser and Digikey are your sources for parts in the USA. Shipping is expensive for just a few parts though. Quote Link to comment Share on other sites More sharing options...
ko853 Posted November 25, 2021 Share Posted November 25, 2021 Hello! Im using sub SW-112 broken. I found 2 transistors damage but cannot know what they are as photo attached. Please advise me the name of those transistors for replacement. Thanks in advance! Quote Link to comment Share on other sites More sharing options...
beerguy Posted August 10, 2022 Share Posted August 10, 2022 Not sure if anyone is around, been working on a couple subs. Two of them are SW-112. One blows the fuse. Is anyone working on these right now? The replacement palate amps are out of stock. The other works, but does not power down after turning on from signal sense. Any thoughts on the one that will not turn off after power up, and component in particular that may help me fix this one up? Thanks! Quote Link to comment Share on other sites More sharing options...
beerguy Posted January 23, 2023 Share Posted January 23, 2023 Hello, the two amps described above are now for sale, as is, I am listening the good one at the moment. Pleas DM me if you are interested in one or both of these amps. Open to ideas/offers. Thanks Quote Link to comment Share on other sites More sharing options...
Telstar Posted February 22 Share Posted February 22 On 1/22/2023 at 8:28 PM, beerguy said: Hello, the two amps described above are now for sale, as is, I am listening the good one at the moment. Pleas DM me if you are interested in one or both of these amps. Open to ideas/offers. Thanks Hi Beerguy, I'm interested in buying a working amplifier for an SW-112. Do you have one for sale? If so, can you provide me with a link to purchase? Thank you. Quote Link to comment Share on other sites More sharing options...
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