A20112 — Power Supply Schematic 2021

| Pin Number | Voltage | Wire Color (Typical) | Function | | :--- | :--- | :--- | :--- | | 1 | +12V | Yellow | Drive / Fan Power | | 2 | +12V | Yellow | Drive / Fan Power | | 3 | GND | Black | Common Ground | | 4 | GND | Black | Common Ground | | 5 | +5V | Red | Logic Power (CPU/GPU) | | 6 | +5V | Red | Logic Power | | 7 | +3.3V | Orange | I/O & Logic | | 8 | +3.3V | Orange | I/O & Logic | | 9 | GND | Black | Common Ground | | 10 | GND | Black | Common Ground |

Example calculations (brief):

That is a (class Y2) for reducing EMI. It is part of the common-mode noise filter. Do not remove it – it’s essential for passing FCC/CE tests. a20112 power supply schematic

: Operates as a PFC controller using Critical Conduction Mode (CRM) to improve power efficiency and reduce harmonic distortion . | Pin Number | Voltage | Wire Color

Does anyone have a clear for this model? I'm dealing with no output on the 12V rail, and the primary side seems to be cycling on/off. The main switchers and rectifiers test okay, but I suspect a fault in the feedback loop or the PWM controller section (likely a 384x or similar). : Operates as a PFC controller using Critical