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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...

Quote:
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.
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