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Found 4 results

  1. First, I'd like to thank @ttb, @aeberbach and others who contributed to my separate thread on SE/30 SONY Chip Voltages. The conclusion of that thread is that while most of the 47uF capacitors on the motherboard see only 5v, there are 4 which see about 12V. That is actually a problem for those 4 capacitors. I know that many people, myself included, recap very often with Solid Tantalum capacitors, myself having used 16V rated parts in the past. But there are important reasons why we need to stop using those 16V rated "solid" tantalums on the SE/30 motherboard, despite the fact that most of y
  2. Have any of you ever measured voltages at UB10 or UB11 (Sony chips) on an SE/30 motherboard? I don't have a long enough cable to safely pull out the motherboard to test that. I am specifically curious if capacitors C3, C4 & C5 see a maximum of 5V or 12V. I suspect one or more of those 3 capacitors do see 12V since the SE/30 schematic shows 12V going into those SONY chips at more than one location. A datasheet on those SONY chips would be wonderful, but I can't find anything like that. The reason I ask about the voltages across C3, C4 & C5 is because I've be
  3. Think the Macintosh 128K, 512K & Plus motherboards don't need a recap? Time to Think Different. It's been 35+ years since the debut of the 128K & 512K, folks. Fluid-filled capacitors don't have eternal life. Properly chosen solid Tantalum, on the other hand, will last the life of the board. My video below shows recapping of the keyboard too. PLEASE watch on YouTube so you can expand the text description under the video, as it contains Mouser Carts and important info, especially for you Mac Plus owners. https://youtu.be/vz2NGF5Vuao
  4. Dear Forum members I am coming to you with a concern. I've never had to remove a tantalum cap before and am concerned that they may blow up (explode) if I expose them to too much heat, more so when desoldering. Is this a general concern? I do know that I shouldn't be exposing anything to more than 3 seconds of continuous iron heat but I just want to understand if there are safety concerns that would absolutely require I wear googles. I get kind of spooked by little things that go pup so… I will be using a TS100 soldering iron which can go up to 400°C.
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