| Electronics > Repair |
| ultrasonic cleaner MH-060S, replacing transistors [fixed > broken again] |
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| htm:
Hi, i'm trying to fix this same cleaner the 15L version (MH-060S) It has 2 boards (see attached images). I marked the bad components on the main board: transistor, some diodes and a blown fuse.(i only know to test the voltage drop using the diode-function on the multimeter) The unmarked transistor shows a voltage drop of 0.3volt accros B&E. Maybe that one is Ok? (The second board has the exact same issue) Both boards having 2x SC3320 transistors. I've found them on ALI for much too cheap ( link ) But i'm probably better of buying proper ones. I've tried searching them outside aliexpres, but wasn't successful. But since i'm not so well versed in electronics, i'm hoping someone here can propose a proper replacement part and website for the EU? Any other suggestions are welcome as well. Thanks |
| fzabkar:
AFAICT, the 2SC3320 was originally produced by Fuji Electric in the early 1990s. https://image.makewebeasy.net/makeweb/0/u8mVxmGkK/Document/_62_Fuji_Semiconductor_2SC3320_datasheet.pdf?v=202012190947 https://pl-1.org/getproductfile.axd?id=8702&filename=2SC3320.pdf Nowadays there appear to be numerous copies. Here are just a few: https://pdf.direnc.net/upload/2sc3320-datasheet.pdf https://www.unisonic.com.tw/uploadfiles/836/part_no_pdf/2SC3320.pdf https://datasheet.octopart.com/2SC3320-Inchange-Semiconductor-datasheet-15978868.pdf https://storage.ua.prom.st/2579499_c3320.pdf I wouldn't know what to recommend. Edit: BUV48 / BUV48A looks like a suitable substitute, but it is just as difficult to obtain from trusted sources. There are versions in plastic packages, but I would prefer metal. https://rocelec.widen.net/view/pdf/lvpyrsjj9z/ONSM-S-A0005942251-1.pdf?t.download=true&u=5oefqw https://www.mouser.com/catalog/specsheets/buv48.pdf |
| htm:
Thanks! Yours is cheaper than the NTE2311 i found(which is a bit overrated). Still shipment with those sites(farnell, tme, mouser) is substantial :/ When i tried looking for a replacement myself, i was comparing thise properties: CE-current=400 CE-voltage=15A, BE-saturation voltage and try comparing switching times. Would these parameters be enough for checking? Like i saw darlington and biplair come. i believe darlington internally has more components and is used to have more gain? is it advantagious to stick to bipolair here? Did you compare more properties for this application? For fitting that other metal-package; i wouldn't know what heatsink to use. But what are the advantages of a metal case? much better heat dissipation i guess, or more? |
| fzabkar:
I found the NTE part as well, but it cost $19. As for parameters, I would also compare hfe, in this case 10 (min), and the switching times. The ultrasonic cleaner is a tuned circuit, so the parts would have been carefully selected. A Darlington pair wouldn't be suitable, I would think. When you are testing the cleaner, I would let it run for a few minutes, then check the temperature of the transistors. I used to do this with line output transistors in CRT TVs. Fakes would run very hot while the genuine transistors would be relatively cool. |
| htm:
On this site, selecting the parameters starting with 15A i came as only available part to your BUV48A and it ships locally, so without customs fees :) https://www.reichelt.nl/nl/nl/transistor-npn-to-218-450v-15a-150w-buv-48a-isc-p6180.html?&nbc=1 Looking at the PDF, the component not having printed parts number, and the next page has 2 pictures misplaced, doesn't give a good impression. Maybe a dumb question;Would you consider buying from this store? or would aliexpress be similarly trustable regarding authenticity? |
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