Join Date: Aug 2008
Location: East Tennessee
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Re: Wanted- Otto, Dead or Alive
I'd measure and record the voltages on the power pins of the ICs, plus sides of electrolytic caps, and outputs of any 3 pin voltage regulators. Also I would feel each transistor, IC and cap noting any one of them that felt warm/hot.
Let it sit, power on until the malfunction occurs then go back and measure the voltages and feel the parts.
The other thought is if there is a single chip microprocessor, it may have a problem
in reading its program when the temperature rises, it reads a bad instruction, program
goes off into the weeds and doesn't recover until power cycled and cooled down.
If you go the freeze-it troubleshooting route, a short blast is all that is needed. Don't encase the components in a block of ice. You wouldn't have a refrigerator around where you could run otto to see if the malfunction occurs at a lower ambient temperature?
And the trees are all keep equal by hatchet axe and saw...RUSH