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Old 05-16-2022, 01:44 PM   #34
Per Hansson
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Default Re: Cyberpower CP900EPFCLCD - F03 Error

The "T" in "TAPc" could stand for "Time Delay" i.e. a slow blow fuse.
But none of those letters really make sense so could just be production numbers...
If you try with a quick blow fuse you don't risk anything.
I.e. you can always switch to a slow blow instead if it blows.
But of course start with the incandescent lamp: that is the most important safety test really...

Originally Posted by Shinjinkun View Post
The bridge rectifier is the BD1 component (BD107G), right? I measured it, without removing from motherboard, with the negative in the AC inputs, and was getting 0.595V in diode mode. The same putting the negative in the positive DC, so I am not sure if this means it works.
However, the U3 component doesn't give me any readings. I didn't remove it from the board either.
Correct, you can also search Youtube or Google for some bridge rectifier test videos, in total there are 4 diodes to test...
As for the optocoupler if you can't read anything it is probably broken.
So desolder it and the 550ohm resistor from the board and test again.
"The one who says it cannot be done should never interrupt the one who is doing it."
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