Image Map Image Map
Results 1 to 6 of 6

Thread: IBM fixed disk controller cap replacement

  1. #1

    Default IBM fixed disk controller cap replacement

    Hi,

    I have an IBM 5170 with an IBM fixed disk controller card that prevents the computer from starting.



    I would like to replace the 2 caps C45 and C46. I believe these are 22 uF, 15V capacitors by Kemet ("bullet" type tantalum cap ?) (looks like this : http://www.bgmicro.com/22uf-15v-20-t...-by-kemet.aspx)

    Can I replace these with a more common tantalum cap like this 22uF 16V cap ?
    Retro enthousiast. Love everything < 486. Learning and sharing on my little channel

  2. #2

    Default

    Shouldn't be a problem. Make sure you observe correct polarity when replacing. As long as a capacitors stated voltage is equal or greater (up to a point), then it theoretically should work.

  3. #3

    Default

    Is there a specific reason they used radial caps for those ? Or is such a decision purely based on the PCB design / layout / spacing between components ?
    Retro enthousiast. Love everything < 486. Learning and sharing on my little channel

  4. #4

    Default

    Most designs are largely influenced based on cost. At that time, the likely requirements were cheaper with an radial capacitor than a axial one. The next highest priority is usually real-estate (space available) but that board doesn't look very crowded, so it likely wasn't much of a concern. And finally, commonality (often the most important factor) is likely as well. Just like when Ford built the original Mustang out of mostly Falcon parts, if the part existed on another assembly, it'd be logical (and likely cheaper overall) to use it again...
    Last edited by T-R-A; October 14th, 2019 at 09:14 AM.

  5. #5
    Join Date
    Jan 2007
    Location
    Pacific Northwest, USA
    Posts
    32,507
    Blog Entries
    18

    Default

    Given the values, I suspect a plain old electrolytic will do just fine.

  6. #6

    Default

    And there's no reason you couldn't replace radials with axials (or vice-versa) either, as long as the leads are long enough and there's not any issue with clearance.

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •