Recently I’ve had 2 RB450’s come across my desk as “dead” units.
1 was the victim of a power surge, the other had just stopped working at some point.
As these were both going to visit the bin otherwise, I claimed both units in the hope that I might be able to use my limited grasp of electronics to fix them.
As it turns out thou, both had exactly the same problem.. namely busted capacitors.
So, I checked the specifications on the popped caps and picked up the closest suitable replacments I could find:
Originals: 6.3v 560uF
Replacements: 10v 470uF (20 cents each)
Used soldering iron and some wick to remove the solder on the existing ones, popped em out and swapped in the new.