I believe the big difference was in the current-supplying capability on the +15V rail -- 1A vs. 4A. I haven't had to dig into a 5409730 though, and haven't looked through the print sets. I believe it was mentioned as an upgrade thing in one of the technical manuals I'd read some time ago.
It would be easy to make up a new harness to swap one in place of the other, since the 5411086 goes to a Mate-n-Lok that plugs into the power distribution board. Thanks, Jonathan On Thu, Jun 6, 2019 at 2:17 PM Noel Chiappa via cctalk < cctalk@classiccmp.org> wrote: > > From: Paul Anderson > > >> (I also should check to see if the H742 uses the same 15V board; it > >> uses the same 'bricks', so it may.) > > > Didn't the H7420 , which replaced the H742, use that also? The H742 > uses > > a different one . > > Oooh, good catch! The H742 uses a 5409730, but the H7420 does use the > 5411086, > the same as in the H765. I always wondered what the difference was between > the > H742 and H7420. > > I wonder if the two boards (and thus the the power harness) have an > identical > pinout, or not. > > Noel >
