CDS‑200B ultrasonic cleaner - AKA James Ultra 7050 etc.
There are many versions of cheap Chinese ultrasonic cleaners, and a fair few share this design, with a removable tank with handle. There are also fixed tank versions which look to use the same basic layout and presumably the same PCBs.
I picked one up "spares or repair" on ebay, and the cleaner was dead, but the fuse wasn't blown.
A quick diode check revealed D7 was shorted. D7 is a 12V 1/2 Watt Zener. I had one in my stash, so this was about as close to a "five minute repair" as they ever are.
The Zener I used was a BZX79C12 but pretty much any 12v Zener of the same or higher wattage, which fits in the holes should do the trick. You may want to stand it slightly off the board to improve airflow and heat dissipation, as Zeners tortured in this crude way as voltage regulators do tend to get warm.
There are many versions of cheap Chinese ultrasonic cleaners, and a fair few share this design, with a removable tank with handle. There are also fixed tank versions which look to use the same basic layout and presumably the same PCBs.
I picked one up "spares or repair" on ebay, and the cleaner was dead, but the fuse wasn't blown.
A quick diode check revealed D7 was shorted. D7 is a 12V 1/2 Watt Zener. I had one in my stash, so this was about as close to a "five minute repair" as they ever are.
The Zener I used was a BZX79C12 but pretty much any 12v Zener of the same or higher wattage, which fits in the holes should do the trick. You may want to stand it slightly off the board to improve airflow and heat dissipation, as Zeners tortured in this crude way as voltage regulators do tend to get warm.
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