hello, this is probably simple, but I searched and didn't find a thread with this specific repair, so I thought if nothing else, I'll document mine.
This is a variable voltage output wall wart power supply, with reversible polarity. It was mainly used for a power supply for audio pedal boards. It has died. This could go under audio, I suppose, but because it is a universal power supply, I thought this section to be better.
This was my friends, and the cord looks like a candy cane its so twisted... Maybe there's a short there somewhere.
When I plug it in, there is no voltage to any of the optional tips.
I opened it up (after fabricating a split flat screw driver tip with a dremel tool and an old flat screw driver bit) and it looks pretty simple. A transformer, 4 diodes, 1 capacitor 25v 1000uF , and 2 resistors. A switch for dc voltage output and a switch for +- polarity reversal.
I have no idea whats wrong with it. Diodes in circuit read 460v 459v 464 and 464v respectively. reverse reads 598 598 602 and 602v respectively.
Caps not bulged. ESR meter won't be here until next week.
Any thoughts on where to begin on this would be appreciated. I don't know how to test the transformer...
This is a variable voltage output wall wart power supply, with reversible polarity. It was mainly used for a power supply for audio pedal boards. It has died. This could go under audio, I suppose, but because it is a universal power supply, I thought this section to be better.
This was my friends, and the cord looks like a candy cane its so twisted... Maybe there's a short there somewhere.
When I plug it in, there is no voltage to any of the optional tips.
I opened it up (after fabricating a split flat screw driver tip with a dremel tool and an old flat screw driver bit) and it looks pretty simple. A transformer, 4 diodes, 1 capacitor 25v 1000uF , and 2 resistors. A switch for dc voltage output and a switch for +- polarity reversal.
I have no idea whats wrong with it. Diodes in circuit read 460v 459v 464 and 464v respectively. reverse reads 598 598 602 and 602v respectively.
Caps not bulged. ESR meter won't be here until next week.
Any thoughts on where to begin on this would be appreciated. I don't know how to test the transformer...
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