Today I've got a REIL's (Runway End Identifier Lights) PSU on the menu. This thing is old, I mean mid '80s vintage! The PSU blows fuses. It's wired for 220V, goes to a step up transformer (~2000V) then through a rectifier and so on.
Here is my trouble with it: The 4 individual rectifier diodes are all over the place. One has a voltage drop of 0.7V others have 1.2V some have drop of 2.8V! I checked this on another bad unit... same thing there. Some one else had a crack at it and put a normal chassis mount bridge rectifier in there, that went poof.
My question is: Why would a XP541 (can't find nothing about this diode) that has a 0.7V drop go to anywhere between it and up to 2.8V? A 2.8v drop can't be good. Wouldn't that put an imbalance? Plus I have to find a replacement for these diodes.
Here is my trouble with it: The 4 individual rectifier diodes are all over the place. One has a voltage drop of 0.7V others have 1.2V some have drop of 2.8V! I checked this on another bad unit... same thing there. Some one else had a crack at it and put a normal chassis mount bridge rectifier in there, that went poof.
My question is: Why would a XP541 (can't find nothing about this diode) that has a 0.7V drop go to anywhere between it and up to 2.8V? A 2.8v drop can't be good. Wouldn't that put an imbalance? Plus I have to find a replacement for these diodes.
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