pdp11/45

From: Kevin McQuiggin <mcquiggi_at_sfu.ca>
Date: Tue Aug 31 14:57:06 1999

At 03:31 PM 31/08/99 -0400, you wrote:
>Sure, but the thing is, the PS seems to be fine when there's no logic
>plugged in. It puts out -15VDC right on the money. When I connect all
>the mate-n'-locs to the logic cage, the voltage dies down severely.
>Doesn't that indicate a 'logic' problem? Or at least a short somewhere on
>the logic boards?

These are old switching supplies with outputs that vary by load.

Look on the -15VDC regulator. It'll be on the shelf behind the huge/heavy
H742 (hmm it may be an H744, I can't remember...) supply: there'll be a
little potentiometer on the unit that will allow you to adjust the voltage
levels. Set it to put out -15VDC with all connections in place. You'll then
see that with the unit running standalone, that it'll show a bit higher
than 15 V.

By the way, can you quantify "severely"?

Kevin


==========================================================
Sgt. Kevin McQuiggin, Vancouver Police Department
E-Comm Project (604) 215-5095; Cell: (604) 868-0544
Email: mcquiggi_at_sfu.ca
Received on Tue Aug 31 1999 - 14:57:06 BST