One more thing to fix... HP9000/380 power supply
Carlos E Murillo-Sanchez
ce.murillosanchez at gmail.com
Fri Feb 12 11:07:13 CST 2021
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.
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