Well I might as well keep chatting to my self on this.
I got a full set of electrolytics for my Sony PSU - just to be sure.
Note this is a different Sony PSU to the Plessey one in Bilbit's thread - maybe because this is the "international" 250v model? Or different factory?
There are only 3 high-voltage electrolytic caps in this PSU -
2x 220uf/250v at C101,C102
1x 4.7uf/400v at C105
C105 was the one that blew, and it connects to the power relay, so I replaced it first and then tested. Bootup OK, so PSU now functional with no problem except still no onboard or keyboard soft power function.
Next thing I'll try will be the small electros on the PCB daughterboard that houses what I think is the counter chip for the PSU. I'll leave that till I get a better desoldering iron that is on its way. PSU traces sink a lot of head and make desoldering a pain. I won't do the full re-cap unless I need to, but I have the caps ready just in case.
Rick
I got a full set of electrolytics for my Sony PSU - just to be sure.
Note this is a different Sony PSU to the Plessey one in Bilbit's thread - maybe because this is the "international" 250v model? Or different factory?
There are only 3 high-voltage electrolytic caps in this PSU -
2x 220uf/250v at C101,C102
1x 4.7uf/400v at C105
C105 was the one that blew, and it connects to the power relay, so I replaced it first and then tested. Bootup OK, so PSU now functional with no problem except still no onboard or keyboard soft power function.
Next thing I'll try will be the small electros on the PCB daughterboard that houses what I think is the counter chip for the PSU. I'll leave that till I get a better desoldering iron that is on its way. PSU traces sink a lot of head and make desoldering a pain. I won't do the full re-cap unless I need to, but I have the caps ready just in case.
Rick