Electronics > Repair
ultrasonic cleaner MH-060S, replacing transistors [fixed > broken again]
htm:
Yeah, confuses me as well.. current design with a component hard to get :-//
i can't wait to try the thing with the new components.. :popcorn:
fzabkar:
Some techs will use cheap substitutes to validate a repair, then replace them with the expensive parts once they are satisfied.
wraper:
--- Quote from: fzabkar on July 29, 2024, 06:20:58 pm ---
--- Quote from: wraper on July 29, 2024, 05:25:55 pm ---You're right. All 15A stuff in TO-220 seems to be discontinued. However you don't necessarily need 15A max either. Lower current rating would be fine as long as saturation voltage is low enough, gain at high current high enough and it's not too slow as what you should care the most about is heating not more than original.
--- End quote ---
The MH-060S cleaner is a current design, yet its designer chose a 30-year-old transistor. ISTM that s/he would know best what works in that particular application. Otherwise, why not choose from a plethora of more common, potentially cheaper transistors? :-?
--- End quote ---
Because they cloned some decades old design without thinking too much? On other hand it's a Chinese 2SC3320, so might be because they could get it cheap and TO-220 footprint is for using say xxx13009 instead.
elektryk:
--- Quote from: wraper on July 29, 2024, 07:45:35 pm ---TO-220 footprint is for using say xxx13009 instead.
--- End quote ---
MJE13009 may be good starting point for debugging.
BTW I tried to repair several ultrasonic cleaners, but some of them worked only a few minutes/seconds and burned another pair of BJTs, probably due to broken inductor, transformer or ultrasonic transducer itself.
htm:
@elektryk
Ok. thanks. not verry promising 🤒
i'll have to find out how to test if inductor, transformer or transducers are defective..
Regarding MJE13009 ; this one says 400V and 12A, while the capacitors on the board says 450V. Wouldn't the same voltage be smart?
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version