Paul Berger via cctalk wrote:
On 2021-02-11 10:55 p.m., Carlos E Murillo-Sanchez via cctalk wrote:
This decade seems to have increased the number of failing things in
such a way that the "to be repaired" backlog is growing much faster
than I can get to diminish it. Argh. A month ago my trusty
HP9000/380 ran just fine and I booted the different OS's in the SCSI
and HPIB drives connected to it (this particular machine is
interesting because the 9000/300 port of NetBSD was partly developed
in it: it was Mike Wolfson's). Yesterday, it failed to turn on; the
power supply is dead. So I unracked the pile of drives and the
computer, checked for obvious things (the fuse is fine, and nothing
in the power supply is swelled up or leaking, or browned by heat;
visually, it looks new; the HV caps seem to hold a charge). I need
the schematics for the power supply (at least the output connector; I
can work my way back from that) and also those for the backplane in
this hp9000/380. A preliminary search at bitsavers and elsewhere did
not help. Does anybody have these?
snip
I have never seen any schematics for this power supply however on
bitsavers there is a document related to the expander that shows the
power supply pinout.
http://www.bitsavers.org/pdf/hp/9000_300/specs/A-98568-66501-4_98568A_Schematic_Notes_Jun85.pdf
This would be the same power supply as the processor box. Also
http://www.bitsavers.org/pdf/hp/9000_300/specs/A-98561-66501-4_98561AB_Schematic_Notes_Jun85.pdf
Paul.
Thank you! these will be very helpful.
Carlos.
