They are designed to take a high-voltage AC input (often 110V/220V) and convert it into stable low-voltage DC output (commonly +5V, +12V, or +24V rails).
Whether you are repairing a critical LED display or building a variable bench supply, keep a copy of the A20112 schematic handy. Better yet, trace your own board and annotate the schematic with actual measured voltages—that personalized document will be worth more than any generic diagram. a20112 power supply schematic
Many industrial A20112 modules are "primary side controlled." This means parts of the board are live with dangerous mains voltage They are designed to take a high-voltage AC
The A20112 is a robust industrial power supply, but due to the age of the electrolytic capacitors inside, most surviving units require a "recap" maintenance service to ensure reliability. If a schematic diagram is required for component-level repair, it is recommended to search for schematics of similar Delta Electronics 150W ATX power supplies from the same era, as the control circuits are often similar. Many industrial A20112 modules are "primary side controlled
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