Having a problem with this power supply circuit (pdf attached). My main starting point issue is it's supposed to be putting out -15v and +15v to pins 1 & 4 respectively on PN201 connector. Pin 1 is showing -33v and pin 4 is showing 19v. I've noted on the schematic some various voltage points. These were measured with powersupply board isolated - no other boards connected. This is what I've checked so far:
1) ESR metered all caps 10uf and larger. They all register good. Triple checked those around the voltage regulator as well (C905/C907)
2) Pulled the Bridge rectifier out and diode checked between all 4 pins. Shows .556v in one direction, infinity in the other and from AC ins (2 to 4) .966v. Seems good, right?
3) Diode checked various other diodes and they seem to check ok as well but to be honest those were all done in circuit so I realize that's not 100% guarantee on the readings.
Hopefully someone can see something in the circuit that would be causing such a higher than expected rectifier output, especially the lopsided negative side vs the positive side.
1) ESR metered all caps 10uf and larger. They all register good. Triple checked those around the voltage regulator as well (C905/C907)
2) Pulled the Bridge rectifier out and diode checked between all 4 pins. Shows .556v in one direction, infinity in the other and from AC ins (2 to 4) .966v. Seems good, right?
3) Diode checked various other diodes and they seem to check ok as well but to be honest those were all done in circuit so I realize that's not 100% guarantee on the readings.
Hopefully someone can see something in the circuit that would be causing such a higher than expected rectifier output, especially the lopsided negative side vs the positive side.