Mac SE or SE/30 Sony PSU recap

[amedeo_68k]

Hi, I have just finished recapping of a Sony psu inside Mac SE/30, but before powering on the PSU I would like to triple check the cap polarity, does anyone have the PSU picture with polarities ?
thank you

Amedeo

 

[robin-fo]

Used this with one of mine.. No guarantee for correctness

 

[amedeo_68k]

Thank you so much, It is correct !

 

[amedeo_68k]

Hi again, PSU has been recapped, machine works fine, but.... I read low voltages on +12V and -12V, it is something about +10V and -9V. (Testing PSU without load), ADJ is set to Max... Ideas ?

 

[joshc]

There is a pot you can adjust on the board, to adjust the voltages. Turn this slowly and re-test. This is exactly why a lot of people ATX convert these now instead of trying to get the old PSU working again, other components might need replacement if voltages are still low.

 

[amedeo_68k]

Yes. But it is already set to max

 

[Skate323k137]

Hi again, PSU has been recapped, machine works fine, but.... I read low voltages on +12V and -12V, it is something about +10V and -9V. (Testing PSU without load), ADJ is set to Max... Ideas ?

Never test PSUs without a load, this is a ground rule for arcade repair, and usually good for retro PCs too. A regulated supply might read right with no load but most power supplies need a minimum load on them to output proper voltage and be adjusted.

 

[cheesestraws]

Yeah don't test PSUs without a load, you won't get anything resembling reality.

 

[joshc]

I missed that bit! Yeah, the SE/30 PSU won't work properly without load, and this is the case with most computer power supplies.