Help for MOTOR 2.2 Kw and control board optimum BF46 milling machine

[irving2008]

The L7824 is a 24volt voltage regulator. Resistance measurements across it's legs tells you nothing about it's condition.

They're pretty indestructible, having built-in thermal shutdown, output current limiting and short circuit protection. About the only way to kill one is to exceed the max input voltage, apply a reverse input voltage (e.g. if the rectifier has failed short-circuit) or connect the output to a high voltage. If it's been replaced or needs replacing then there is likely to have been something catastrophic happen to the board and many other parts may also need replacing.