Chk-v9.04g - Circuit Diagram

Measure the capacitance of the large film capacitors using a dedicated capacitance meter. Visually inspect them for bulging or leakage. Degraded high-value voltage sensing resistors.

High-value resistor divider networks (utilizing large 100kΩ to 470kΩ precision resistors) tap into the main lines. They relay exact real-time voltage and current values back to the comparator pins of the MCU or an LM339 Operational Amplifier. chk-v9.04g circuit diagram

Strings formatted as vX.XXg (where X is a number and g might indicate a specific revision like "gamma") are typical of firmware or software versions. The "chk" prefix might relate to a "check" utility or a device that performs a checking function. Measure the capacitance of the large film capacitors

These are the most common points of failure. They act as electronic switches that turn the compressor or heating element on and off. The "chk" prefix might relate to a "check"