EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: Davemiller1985 on December 12, 2024, 09:10:13 pm
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hi, i recently got this heathkit IO-12 from my father and was cleaning the pots when i noticed a wire had come loose. it is a black wire coming from the horizontal gain knob. i do not know where i can find this on the diagram or where it may go. i have attached 3 pictures in hopes that someone can help me. i have also attached a diagram of the area nearby the pot and the whole diagram.
edit: i have learned that this device has been open possibly multiple times as it came from a school/college.
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Difficult to see, but I think the wire is coming from the counter-clockwise (CC) end of the Horizontan Gain. In which case it should go to ground - 0V. It might have been connected to the chassis.
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there is a red wire attached to the same point which goes to ground. sorry about the quality, im using my laptop
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a copy of the original assemble book is here (plus many others ) https://www.vintage-radio.info/heathkit (https://www.vintage-radio.info/heathkit)