Allows fine-tuning of the output (usually ±10%, e.g., 10.8V to 13.2V).
The most common failure point. Measure collector-emitter (C-E) resistance. TL494 Controller IC: Check if Pin 12 has roughly s36012 power supply circuit diagram
Using the schematic, you can troubleshoot known issues: Allows fine-tuning of the output (usually ±10%, e