APW12 1215b training for the CPU chip optocoupler feedback circuit

For the CPU chip in the APW12 1215b main power area to be activated and work normally, the optocoupler needs to detect the 400V output of the PFC circuit, and then the 12V output from the No. 2 secondary power will supply power to the main power chip. In this way, the entire PSU will output 15V DC voltage normally.

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