or Viper22A IC) converts AC mains to 18V (for the fan and IGBT gate drive) and 5V (for the microcontroller and display).
Before diving into the diagram, we must understand the board's role. The CHK-V9.04G is generally a combined with a motor driver interface. Unlike a standard computer PSU, this board handles: chk-v9.04g circuit diagram
AC Input (110-240V) → EMI Filter → Bridge Rectifier → Bulk Capacitor (400V) ↓ PWM Controller IC (e.g., UC3844 or equivalent) ↓ Main Switching MOSFET (on heatsink) ↓ Flyback Transformer (primary side) ↓ Secondary Windings → Diodes + Capacitors → Linear Regulators → DC Outputs ↓ Feedback Optocoupler (to regulate primary) or Viper22A IC) converts AC mains to 18V
Based on typical technician repairs for this board version, the circuit consists of these primary sections: Power Input & EMI Filter: Unlike a standard computer PSU, this board handles:
: Monitors for over-voltage or under-voltage on the mains line.