Chk-v9.04g Circuit Diagram !!better!! -

This is where the mains power (usually 110V or 220V) enters. It contains safety features like a glass fuse and a metal oxide varistor (MOV) for surge protection.

Driven by an external quartz crystal oscillator (frequently 8MHz or 16MHz) stabilized by twin 22pF ceramic load capacitors to ground. chk-v9.04g circuit diagram