| Electronics > Repair |
| Keithley 2001 Repair (Bad Capacitors) |
| << < (4/5) > >> |
| jonsikul:
Just some flux I guess, it cleans right off. |
| derZockerMP:
Good job with the cleaning. :-+ Did you desolder the other ICs that are not directly corroded? Because underneath, in most cases, there is also corrosion that is not a problem yet but could be in the future. Then I rewired all the corroded parts on my board, put it all back together, and started an initial smoke test. Then nothing happened, and all the voltage was lost in the white ceramic resistor used for voltage preselection. So the transformer had too low resistance. First, I searched the voltage selection circuit for a problem because that's often where the problem is. But then I connected the transformer directly to an AC source, and it was drawing too much power without anything connected. I will post X-rays this afternoon. |
| derZockerMP:
Here attached some X-Rays of the corroded spot. Hope the pictures show everything what you need. The top Layer is maybe not shown because of corrosion on the PCB. |
| jonsikul:
derZockerMP, That's amazing, thank you so much, you are a life saver! I believe I can see everything I need in the pictures :) :) :-+ Do you just happen to own an x-ray machine? I am so envious. Best regards Jonsi |
| jonsikul:
I have only removed U505-U508 along with U513 and cleaned underneath them. I guess you are right, I should probably remove more and make sure it is fully clean for the future. As of now, I am not sure if my transformer is damaged, I have yet to test it, but I am not optimistic as apparently I have read from many here on EEVblog that they have a damaged transformer. |
| Navigation |
| Message Index |
| Next page |
| Previous page |