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28782Re: [midatlanticretro] RK05 battery pack for emergency head retraction

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  • B. Degnan
    Dec 30, 2012
    • 0 Attachment
      -------- Original Message --------
      > From: "David Gesswein" <djg@...>
      > Sent: Friday, December 28, 2012 9:30 AM
      > To: midatlanticretro@yahoogroups.com
      > Subject: Re: [midatlanticretro] RK05 battery pack for emergency head
      retraction
      >
      > On Thu, Dec 27, 2012 at 11:08:08PM -0500, B. Degnan wrote:
      > > Found from the manual that the batteries are associated with the H743
      > > voltage regulator.
      > >
      http://bitsavers.trailing-edge.com/pdf/dec/disc/rk05/DEC-00-RK05-DA_RK05main

      > > t_72.pdf
      > >
      > > thanks for the tip, I do run the system somewhat frequently, but I
      never
      > > thought about the batteries in each drive's power supply system. They

      > > probably will not leak unless they're incredibly old, I *assume* the
      > > previous owner replaced them, but I will make this a priority to
      address.
      > >
      > They are nickel cadnium so will leak after enough time though not as bad
      > as some other types and only metal below them. The origional has a
      plastic
      > sleve around the entire pack which also contained most leakage. Next
      time
      > I replace them I probably will see if supercaps will provide enough
      energy
      > so the repair is permanent.
      >

      By the way, thanks for the great web site, I really appreciate the time and
      effort put into putting all this together...I am getting closer to having a
      "DEC teletype" set up, by following these directions
      http://www.pdp8online.com/pdp8cgi/query_docs/tifftopdf.pl/CHD/LT33_print_set
      .pdf

      Right now my teletype is stock, and only capable of receiving, but at least
      that part works great now.

      Bill
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