voltage drope in 2 pin.

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Dear Sir 

    I desinge 4 chnnel smps each connector contain 12V/1Amp. but in second connector voltage drope after some time it drop 12V to 8.36V and other connector have constate voltage. Where is problem i can't understand plz solve my problem. I have attech pdf file of my layout.

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12volt4amp.pdf147 KB