68kMLA Classic Interface
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| Click here to select a new forum. | | IIsi PSU question | Posted by: JC8080 on 2023-12-01 17:07:22
I have a recapped PSU in my IIsi and it has been working fine since the recap - it's been a few months, but probably only 10 hours of run time. The machine has a NuBus adapter and 8*24 video card. Yesterday while I was using it the machine restarted and then went into a restart loop where it would chime, and about 2 seconds later reset and chime again, and so on. I removed the NuBus adapter and video card and it seemed fine, I thought the video card may have failed, but then after a few minutes of running without the video card the restart loop started again. I replaced the PSU with another recapped unit and everything seems to be working fine. I assume the additional load from the adapter and video card was causing the failure to happen sooner.
I am going to open the bad PSU and take a look around in the next few days, but before I do that I wanted to see if these symptoms sound like any particular failure state people have experienced with the IIsi PSUs. When I did the recap I recapped the daughter board, and I am 99% sure I replaced the two large 220uf caps. I'm guessing there may be a questionable trace I missed that is finally failing, I just thought I would see if anyone has thoughts before I dive in. | Posted by: David Cook on 2023-12-01 18:25:22
Make sure it isn't just the power supply switch. If it isn't fully extended or fully pressed in, the machine can do funky things. | Posted by: JC8080 on 2023-12-01 19:34:02
Make sure it isn't just the power supply switch. If it isn't fully extended or fully pressed in, the machine can do funky things. Thanks, I'll check that before I open it up. | | 1 |
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