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| Sony CR44 power supply repair... or not? |
Posted by: clh333 on 2019-01-29 10:31:57
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-
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Posted by: Johnnya101 on 2019-01-29 12:41:55
If needed, I have a PSU that I got in my haul from an SE with no cover on it, so assuming its a parts PSU. Could swap out some stuff from that.
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Posted by: clh333 on 2019-01-29 13:11:29
Thank you for the offer. Let's see if anyone else has any ideas. I'd really love to find that Sony chip or a replacement. Better yet I'd love to find out why the voltages are so far off.
Thanks for your reply,
-CH-
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Posted by: trag on 2019-01-29 13:12:01
There's a thread around here somewhere about replacing the guts of the SE or SE/30 PS with the guts of a mini-ITX or 1U power supply. If you can't nail down your component failure you might look at that solution.
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Posted by: SE30_Neal on 2019-01-29 14:00:02
I saw that it wasn’t long ago, within 4-8 weeks
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Posted by: Jinnai on 2019-01-29 20:54:11
I want to know if you find a solution. Your voltages aren't that far off: mine has between 1 and 2 volts on both 12v and 5v. I also recapped, but it didn't fix it.
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Posted by: JackRubin on 2024-08-09 20:59:17
@clh333 - did you ever find a source for the IK1H4? |
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