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Found 2 results

  1. Picked up an old, very dusty Macintosh 7100/66 from a guy in Cincinnati about a year or so ago. Worked for a while but one day I heard some crackling noises coming from within the PSU. Unplugged it very quickly and cracked open the PSU to find the devastating scene in the attached photo. I noticed one of the IC's was fried pretty badly, so I bought a replacement and installed it. However, upon plugging in the power supply a second time, the IC fried in the same exact way it had before. I've circled it red in one of the attached photos. I really have no idea how this PSU works, but what might be frying that little chip? I'm OK at soldering, but still pretty bad at diagnosing component-level issues. I also have a lower-end fluke multi-meter so I can check diodes, capacitance, and that sort of thing. In fact, I checked the two larger caps and they were still functioning. Thanks to anyone who can give some advice! Edit: Just realised I put this in the Apple II Category by mistake. Could a mod help me move it to the PowerPC category? Thanks.
  2. Not too long ago I returned on my PM 7100/80, which right now has a sonnet PDS g3 260/1M, a 4MB HPV card connected via the g3 card's ribbon cable, and one nubus slot used by an Atto SiliconExpress IV. For a few reasons (among others, using a disk attached to the SEIV at the same time the G3 is enabled freezes the machine without exception) I'm looking for a comparable newertech G3 upgrade. G3 upgrades sales seem to become sparse, sort of. There's a couple listings on ebay that are not reasonable to me, price-wise. While I'm unsure getting a newertech upgrade would make things any better, I have a few concerns I feel like posting here hoping it eases up deciding what to do. - Can anyone confirm newertech PDS cards have fixed CPU:FSB clock ratio? Sonnet chooses settings in software, and perhaps fixed/jumper-set bus ratio would help with some quirks I'm experiencing. - As far as I know, 6100, 7100 and 8100 all have the same memory architecture. So that should mean NewerTech's G3 upgrades exclusive to the 6100 are this way because the card has a CPU:FSB ratio too high for the CPU to work with a 8100/80, 7100/80 or 8100/110. So if such a card gets its PLL setting to something lower, it should just work. It would give me more options. Is there something more I should consider for this? - Did anyone try using sonnet's ribbon cable to connect an HPV/AV card to a NewerTech upgrade? Did it work? Finding a Newertech G3 card WITH the ribbon cable raises the bar a lot. I'm not sure I'll have answers for the last two, but I still hope. Thanks!