A high-frequency transformer provides safety-critical isolation between the "hot" AC side and the "cold" DC output side. Secondary Regulation:
The auxiliary winding capacitor (C22 on the schematic) is the #1 failure point. When it dries out (typically after 2-3 years), the controller loses bias voltage, causing the supply to "hiccup" (start, stop, start, stop). wannien 101v0 power supply schematic exclusive
The exclusivity of the schematic stems from the board's origin as an OEM design, intended to be used and discarded, not repaired and documented. For the independent repair technician, the lack of documentation turns every failure into a detective case. the controller loses bias voltage