clh333
Active member
Been reading http://www.ccadams.org/se/classicmac2.pdf and also Pina's books for info on repairing Mac SE power supplies. I have a Sony CR44 that tests the -12VDC lead as -8.5, +5VDC as 5.3 (both lines) and +12VDC as 13.5 and 14.2 respectively. I have already recapped the PSU and am reasonably confident the error is not the result of that work. However, that's as far as I went and now I suspect that the problem lies elsewhere.
I have three choices, it seems: try further repairs on this unit; buy a (used) replacement or find a new supply to use instead. Each of these presents its own challenges. Pina is certain that IC 151, a Sony IK1H4, is at fault. I can't find that part anywhere and I have no cross-reference or data-sheet for the part. A used power supply may well have, or develop, the same problems this one has. A new power supply will probably need to be adapted for use in the Mac, and apparently not many supply two independent +12VDC supplies.
I'd be happy to hear suggestions as to how to proceed. Thanks for your replies.
-CH-
I have three choices, it seems: try further repairs on this unit; buy a (used) replacement or find a new supply to use instead. Each of these presents its own challenges. Pina is certain that IC 151, a Sony IK1H4, is at fault. I can't find that part anywhere and I have no cross-reference or data-sheet for the part. A used power supply may well have, or develop, the same problems this one has. A new power supply will probably need to be adapted for use in the Mac, and apparently not many supply two independent +12VDC supplies.
I'd be happy to hear suggestions as to how to proceed. Thanks for your replies.
-CH-