Patent ID: 7439846

Claim:
A method of resistance adjustment by cutting off a resistance film formed spanning between a plurality conductors on an electronic circuit board so as to adjust a resistance value between the conductors, wherein the resistance adjustment has a preliminary resistance adjustment which is carried out before said electronic circuit board is incorporated in an associated equipment, and a final resistance adjustment which is carried out after said electronic circuit board is incorporated in the associated equipment, said preliminary resistance adjustment comprising a first cutting-off step of cutting off the resistance film so as to form a first cut-off part, and a second cutting-off step carried out subsequent to the first cutting-off step, of cutting off the resistance film in a direction different from a cutting-off direction of the first cut-off part so as to form a second cut-off part which is connected to the first cut-off part substantially at a position of an end part of the first cut-off part and which serves as a marker, and said final resistance adjustment comprising a third cutting-off step of recognizing a position of said second cut-off part, and cutting off the resistance film in a direction different from the cutting-off direction of the second cut-off part so as to form a third cut-off part, leaving a length capable of preventing cracking of said resistance film remained.