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Need help troubleshooting SA-7500 II
- Thread starter Cuppy
- Start date
Cuppy
Why do today what you can put off till tomorrow?
OK. Another update and I've run into a dilemma I could use some advice on. I have almost completed recap of all electrolytics while paying careful attention to polarity of schematics and original installed components. I found 2 caps that were installed reversed from the factory (C23 & C24, 2.2uf 50V) vs. the schematic. From everything I have read on this forum, the advice is to install caps as per original as schematics often have errors. Was hoping someone could take a look at attached and provide advice. The amp did sound fine before the recap but not sure what effect these 2 caps would have on the circuit if not installed correctly. Thanks in advance.
Attachments
I would install in the same orientation as the ones you pulled out. Then monitor them closely when you power it back up on a dbt or variac. I think you could also consider a non-polar cap as replacements for those. I could be wrong about that so maybe wait for the more experienced to chime in.
Cuppy
Why do today what you can put off till tomorrow?
Thanks bberkom. I have installed the replacements in the same orientation as originals. I have also considered using a bi-polar but hate to place an order for 2 caps. Also the original caps were the orange Elna CEANL low leakage so I would assume they could affect the audio quality if not correct. Wish I knew more about how they fit into the circuit. The amp sounded ok before any caps were changed but want to be sure so any future owner of this little amp can also rest at ease.
Cuppy
Why do today what you can put off till tomorrow?
Still hoping someone will chime in on my cap dilemma (C23 & C24) before I finish patching this thing up. For now I have installed the replacements in the same orientation as it came from the factory. Just not confident the factory got it right or if the schematic and screen printing is wrong.
Here is what I see as my options;
1) install caps as original and assume schematic and screen printing is at error. (amp worked and sounded ok before recap)
2) install caps as per schematic and screen printing and assume factory made the error in production
3) install bi-polar caps in these positions
4) install film caps is these positions (may not have physical space).
Open to all professional opinions and thanks to all who have contributed so far.
Here is what I see as my options;
1) install caps as original and assume schematic and screen printing is at error. (amp worked and sounded ok before recap)
2) install caps as per schematic and screen printing and assume factory made the error in production
3) install bi-polar caps in these positions
4) install film caps is these positions (may not have physical space).
Open to all professional opinions and thanks to all who have contributed so far.