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help please!!!! (Electronic Components)

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liorillusion

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Guys i really need your help

I took the machine to my electronics guy and he identifies the problem as follows:

The more serious problem is that he says the BIpolar diode also got damaged...he said that he tried to look for it with his usual supplier but he couldn't find it according the (Japanese) serial number on the BIpolar diode...the serial number on the BIpolar is: SC550B my question is do you know what kind of BIpolar he should look for or what is the parallel BiPolar Diode i should look for? or maybe its not diode?

maybe this one? https://www.alldatasheet.com/datashe-...LIN/VR60.html?

Thank you very much for your help!

Ive attached some pictures of the damaged component - any help will be appreciated!

BIpolar diode 1.jpgBIpolar diode 2.jpg
 

To start off: no such thing as a bipolar diode.
And if you would tell us what the "machine" does, it would help....E
 

the machine is pachinko machine and its work with 100v. this is a pictures of all the power board. thank you! Power Card.jpg
 

Technically liorillusion is correct there are no bipolar diodes, but there are companies that sell what they call bipolar diodes. An example is Diotek. They are really just two diodes connected together. They are also called TVS or diode arrays. Most often they are zeners connected back to back in series. As an example a pair 20v zeners will conduct at over + or - 20.8v

I cannot find a SC550B on line. If you have a board with a good SC550B it would be easy to measure it. Then finding a replacement would be simple.
 

From the photograph in post #3 it looks like an SMPS and the proximity to the power switch and what looks to be a filter inductor and capacitors I would guess it's across the AC input lines. If I'm right, and it works on 100V (strange AC mains voltage!) it should be rated at around 150V.

As a rule of thumb, whatever the AC supply voltage is, multiply it by 1.414 to find the peak voltage expected across it then add 10% to get the correct voltage rating. You can use almost any available TVS with that rating.

Brian.
 

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