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ya it is 28 pin 8-bit micro controller and i have the data sheet.(it is in my UPS)
is it very rare IC?here in sri Lanka i am unable to find that in market.
thank you both of you.that means i have to throw my UPS and have to buy another one.i can buy that only from china.with the shipping cost it's better to buy new one.anyway thank you very much.
a technician checked that and said that fault is in processor.i do not have enough knowledge to check that.can you guess another part?