18 Jul
2012
18 Jul
'12
1:56 p.m.
OK, you have 2 choices I guess. Try to find a
mating plug for that
I checked the wiring with a meter and identified the TXD, RXD and GND
wires and have just connected them to a DB9. I believe this machine was last used as part of a medical device which may
explain the
interesting connector choices.
Then it's most likely a missing NPG jumper. This is a wire-wrapped jumper
on the backplane between pins CA1 and CB1 of a SPC slot. It has to be cut
if there's a NPR device (one that does DMA, like an RL11 or RX211) in
that slot, it has to be fitted if the slot is empty (other than the grand
contiuity card in connector D), or if there's a device there that maks no
connection to those pins. And finallym, it doens't matter whether it's
there or not if there's a device there that simply shorts the pins
together (like a DZ11)
If you find the misisng jumper you have sevral choices. One is to pull
the backplane and fit a wire-wrapped link between the pins. I normally
use red or orange wire for this so it's easy to spot if I want to remvoe
it later. If it's an empty slot, yuo could use one of the later
dual-height continuity cards if you have one. Or cut a sliver or
single-sided copper clad board ot slid into that conenctor (copper side
towards the CPU) and just short those pins togehter.
If it's a slot with a card in it that maks no connection to pins CA1 and
CB1, then you could solder a link between those edge fingers on the card.
-tony
Are yuo using the single-height grant boards
(little square things) or
the dual-height ones (with handles)? If the former, check you've got them
the right way round, the traces towards the M9302 end of the backplane.
Yes it certainly looks like a grant issue. I have the little square
boards and they are all correctly inserted.