875 Power Controller/H7104C 2.5VDC PSU/H7104D 5VDC PSU

From: John Willis <jwillis_at_arielusa.com>
Date: Thu Nov 7 17:36:00 2002

Load-level? As in on the backplane?

-----Original Message-----
From: Fred N. van Kempen [mailto:Fred.van.Kempen_at_microwalt.nl]
Sent: Thursday, November 07, 2002 4:29 PM
To: cctalk_at_classiccmp.org
Subject: RE: 875 Power Controller/H7104C 2.5VDC PSU/H7104D 5VDC PSU


John,

"Over Current"- smells like a load-level short.

--fred

> -----Original Message-----
> From: John Willis [mailto:jwillis_at_arielusa.com]
> Sent: Friday, November 08, 2002 12:22 AM
> To: cctalk_at_classiccmp.org
> Subject: RE: 875 Power Controller/H7104C 2.5VDC PSU/H7104D 5VDC PSU
>
>
> The lights do come on, it's just that the ones that come on are
>
> (o) = lit, ( ) = not lit
>
> ( ) Power OK
> ( ) Over Voltage
> (o) Over Current
> (o) +2.5V Fail
> ( ) +5V Fail
> (o) Reg Fail
> ( ) Over Temp
>
> (o) Power
>
> Have the printsets now, will probably take both units apart for
> Inspection and cleaning.
>
> John
>
> -----Original Message-----
> From: Peter Turnbull [mailto:pete_at_dunnington.u-net.com]
> Sent: Thursday, November 07, 2002 2:45 PM
> To: cctalk_at_classiccmp.org
> Subject: Re: 875 Power Controller/H7104C 2.5VDC PSU/H7104D 5VDC PSU
>
>
> On Nov 7, 13:43, John Willis wrote:
> > Anyone have any documentation on these units as far as
> > What to do when the fail lights come on?
>
> The Field Maintenance print sets for the PSUs and the power controller

> are available at http://208.190.133.201/decimages/moremanuals.htm
> (part of the DFWCUG Historical CPU Preservation Society). They are
> BIG files.
>
> If an 875 power controller is like an 876, then if the lights
> don't come
> on, reset your breaker :-)
>
> I don't know about the H7104's (I've never seen one up
> close). I assume
> there is something plugged into the 3-pin Power Bus connector, or you
> have the three-way switch in the "local" position, otherwise it won't
> turn on.
>
> --
> Pete Peter Turnbull
> Network Manager
> University of York
>
Received on Thu Nov 07 2002 - 17:36:00 GMT

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