my P500 output from the filtered AC is fine. the fuses are fine too. however, the regen outputs are low. in auto mode i get up to 70 volts AC (58 right now; seems to go up a bit when the unit warms up); in the other modes it drops about 10 volts.
i opened the case and see nothing dramatic. i used my peak ESR meter to test the large caps on the regen circuit.
C5 3610uF 0.58ohm ESR (some evidence of deterioration)
C3 3652uF 0.6ohm ESR
C1 3464uF 0.56ohm ESR
C2 5992uF 0.08ohm ESR
C4 6440uF 0.08ohm ESR
C10 6354uF 0.1ohm ESR
I called PSA and was told you no longer service the P500s. I was told you could send the schematic
I have a local tech who can hopefully look at this but has COVID; hoping for his full recovery!
if it is just replacing the power supply caps i can do that myself
any tips would be appreciated.
the schematic says the power caps are supposed to be 3300 uF and 100v (they are polar caps). at least some of them are measuring way off from that. another one had some signs it was dried out.
seems like a good 1st step would be to replace those caps. does that make sense? if that doesn’t fix the problem i’m going to hope my tech can sort it out.
mouser deliveries were running slow. the new caps finally arrived and i installed them last night. the old caps were definitely dried out (at least most of them were). alas, this has not solved the problem. set on auto, the regen outlets are producing about 83 volts AC. that is an improvement over the high of 70 volts AC i noted above. i’ll leave it plugged in and see if i can any more gain–it did take a while for the readings to slowly ramp up last night. right now the voltage seems to be stuck at this new high.
replacing the caps is within my competence, but troubleshooting beyond this easy fix is not.
This level of troubleshooting is outside of my wheelhouse as well. Sorry the new caps didn’t fully bring it back to life. At this point, it might be best to send our service team and email and see what they think. service@psaudio.com
rogefenderer,
Sorry to bother. My P500 has the same problem recently. May I ask if you have resovled it? I changed the 6 3300uf/100v capacitors but the problem is still the same. I think I have to fix it for some other parts. So I will need the schematics. Wuold you please send a copy to me if you have one from PS? Thanks!
i also changed the large caps and it did not solve the problem. i have not been able to diagnose the problem. i do have some schematics somewhere. i will look for them.
i found a zip folder but i can’t upload that. this interface will only let me upload pictures.
send me an email at dwwolf @ aol . com and i’ll try to send you the zip folder.
rogerfederer,
Thank you very much for your kind reply. When I desoldered the 6 3300uf big capacitors, I also checked the 6 100nf(0.1uf)/250v CBB capacitors in paralell to them and found some of them are in fault also. I suggest that you can try to change these 6 littile ones and see if it will work. Those capacitors are not very good quality ones.
Also thanks for the file. It will be in great help for me.
OK, thanks
i forwarded an email w attachments i received from a PS Audio tech. i also attached my zip file re the P500.
let me know if you figure out your problem.
i’ll try your small cap suggestion (though it may be a while…)
