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BURNED RESISTOR ID
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If the resistor is a NON Carbon film (most are these days) its got a
spirally
nickel band from one end of the leed to the other under the color bands
coating.
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What happens when a resistor overheats and burns up, is usually the metal Spiral
opens up approximately dead center.
1. Carefully scrape the burnt coating off the surface & you will see the
spiral.
2. Measure from each side of the break to the end leed with an ohm meter.
3. Add up the 2 values & that's about the 'ball park' of the original
value.
Some Technicians have reported to be able to have
dropped a solder bead between the break, forming a conductive junction, and
measure between the the original 2 spots to get the resistor value.
This Information Originally Supplied from:
Sci.Electronics.Repair