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I am trying to find a component for this auto crane control board. I believe it is a fuseable resistor, but I’m not sure. There are three of these components, the two outer ones heat up while power is applied to the board, the middle remains cool. The two outer ones measure 600 ohms on board with no power, the middle measures 1211 ohms, I think that’s the correct resistance due to the writing on them. When power is applied, the two outer ones measure 12V across while the middle measures 0. System V is 12V-14V.
Any help identifying these components would be greatly appreciated.
A resistor value of 1.21KΩ would suggest a precision type (not necessarily fusible) as it’s only found in the E48 and higher series of preferred numbers.
The first observation would nicely explain the second here. No voltage across a resistor means no power is being applied, therefore there’s no reason for it to heat up.
In-circuit measurements are invalid as a general rule, unless one has sufficient information about the rest of the circuit to understand the influence that will have on the measurement. The difference in behavior across 3 different instances of what appear to be repeated instances of a functional block may well be a clue as to what’s going on. It’s could also be a normal and expected behavior depending on how the circuit is designed and what it’s supposed to do.
It seems very likely to me that those resistors are just fine, and that the cause of problems is most likely to be found elsewhere.
Thank you for your time and input. We’ve been trying to get this board repaired for a while now. The manufacturer keeps ghosting us on the repair pushing for a replacement, which is very expensive. I’ll keep digging into it.
Good catch on checking the controller board first instead of replacing random parts. On equipment like cranes, vibration and moisture can also cause cracked solder joints or connector issues that look like component failure at first. Definitely worth inspecting the board under magnification before ordering replacements.
