Photo of new PSU-2448mk2 Power Supply Kit
Has (3) on-board fuses with LED indicators.
If all (3) LED lamps are lit up, everything is good. All systems go.
Now, we intentionally create a short circuit by shorting the +48V voltage rail to Ground.
Poof! Fuse blows, and LED lamp for the +48V fuse is OFF - meaning, there was a short circuit somewhere and this fuse needs replacement.
Remove the short-circuit we created during this demo, and replace the fuse with a brand new one.
Voila! LED is lit up again - meaning, our +48V line is working again.
NOTE: We didn't damage the voltage regulator, didn't have to desolder it, or replace it with a new one. We just pop-out the old fuse and replace it with a new fuse.
Cost of fuse = $0.10
Time to fix = 2 seconds
Peace of mind knowing that you won't have to desolder a 3-pin device and solder it again, and risk damaging your PCB while you fight to get the old voltage regulator out.... Priceless!