On Sun, Jun 17, 2012 at 6:30 AM, Jay Jaeger <cube1 at charter.net> wrote:
Update. I did just find some DG Doc, in the Nova 4 16
Slot Illustrated Parts
Breakdown (016-000940-00) that I have.
Curiously, for 120v, they show Hot going to Pin *** 4 ***, but the plug
otherwise wired exactly as I described in my previous message. ?But, I think
that is in error, and one should wire hot to pin ***3 *** for 120V.
For 240V they show Hot going to pin 3, neutral to 9, and ground to 5 (and
6). ?For 240V the only interconnects they show are from 1 to 11 and from 4
to 7 (as opposed to 4 to 8 for 120V). ?Again, I think that hot pin 3 is in
error, and (probably) for 240V, one should wire hot to pin 4 BUT I HAVE NO
WAY TO VERIFY THIS.
HOWEVER, I did go back and re-verify what I wrote earlier on both my Nova/4
and (now) my S/140 as well and both have pin 3 as HOT. ?All 120V of it.
Other than that, the interconnections I described below match the doc. ?The
only variance is between hot for 120v (I say pin 3, they say 4) and hot for
240v (they say pin 3).
Go figure. ?(Unfortunately, I don't have power supply drawings that I can
use to arbitrate).
Thanks Jay,
Using this, I was able to get the power supply going. All voltages
check out OK, so after some careful examination I've plugged in the
CPU board. The expected output on the console port is the "O" from
"OK"; the K isn't printed because there's no memory.
Powered it on, and after some twiddling with the console cable pinout
(weird one) yes, there's the "O".
Installed the memory board, powered it on again, and alas, still "O"
rather than "OK". The Field Engineer's Reference says that that means
a memory failure.
Of course, the memory board could be faulty, but it could also be a
matter of incorrect jumper settings on the memory board. I haven't
been able to find a description of these yet.
The board says "DGC BBU MEMORY", and contains 8 x 16 AM9016DPC ic's
(4116 equivalent). That makes it 128 16-bit kilowords of memory (no
parity or ECC, although there are 5 empty spots per row).
There are 6 jumper positions labeled 16,17,18,19,0 and 1; each can
have a jumper in the 0 or in the 1 position. My board has a jumper in
the "0" position for jumpers 16, 17 and 18. No jumpers in the other
three positions:
?o ?o ?o ?o ?o ?o
1
?o ?o ?o ?o ?o ?o
0 | ?| ?|
?o ?o ?o ?o ?o ?o
?16 17 18 19 0 ?1
Is anyone familiar with these?
Camiel