> Wait, then why don't they just switch over each component in turn? The "divide and conquer" debugging strategy. My guess would be that they want to try that

> Wait, then why don't they just switch over each component in turn? The "divide and conquer" debugging strategy. My guess would be that they want to try that method only if this debugging doesn't work. Imagine that there's an electrical issue in item 1 that fries item 2. If you switch over to item 2b, then you fry item 2b too! This is exactly what happened with the Soviet Salyut 7 station. They tripped an over-current protection, didn't fix the root issue, and remotely turned the circuit back on. A series of electrical shorts then rendered the entire station without power, resulting in the need for one of the most daring station rescue stories of all time: https://arstechnica.com/science/2014/09/the-little-known-soviet-mission-to-rescue-a-dead-space-station/ https://arstechnica.com/science/2014/09/the-little-known-sov...