My fathers belt sander from the 80s which i very much would like to continue using has an issue with the speed control. The machine works fine on maximum speed but will not turn or give any sign of life when on any other setting. The speed control is a dial going from 1-6 although implemented as a potentiometer without distinct steps. I took the machine apart and measured each component individually, all components and measurements have been captioned in the attached pictures. The Triac did not get identified correctly using my cheapo component tester, i don't know if this is user error, if the component tester is failing or if the Triac is broken. Also the thermistor? measures open circuit.
Any help appreciated on what you think and what i should focus on!
Any help appreciated on what you think and what i should focus on!
Comment