24 Jan
2005
24 Jan
'05
9:57 a.m.
I've got a Data I/O 29b with Unipak2 that is on the fritz. I thought it was
working, but it's not.
It frequently reads chips right, then 60 seconds later reads different
values with different checksums. It's sporadic. It never gives any failure
messages (other than bad verify ram to device). It just doesn't get the
right values sometimes.
I'm not up on the internals/repair of this unit, nor do I have time at the
moment and I need a working one ASAP.
Would anyone on the list know a shop that does repair of these units? Or
maybe be able to ship me a 29B and/or Unipak 2 so I can at least determine
which major component is ba and get over this hump?
Thanks for any thoughts/advice :|
Jay West
24 Jan
24 Jan
10:42 a.m.
It is probably a Power supply problem, not supplying constant filtered
voltage or a heat sensitive part not in the power supply. Do you have the
schematics / documents for it?
,George
----- Original Message -----
From: "Jay West" <jwest(a)classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Monday, January 24, 2005 6:57 PM
Subject: Data I/O 29B help
I've got a Data I/O 29b with Unipak2 that is on
the fritz. I thought it
was
working, but it's not.
It frequently reads chips right, then 60 seconds later reads different
values with different checksums. It's sporadic. It never gives any failure
messages (other than bad verify ram to device). It just doesn't get the
right values sometimes.
I'm not up on the internals/repair of this unit, nor do I have time at the
moment and I need a working one ASAP.
Would anyone on the list know a shop that does repair of these units? Or
maybe be able to ship me a 29B and/or Unipak 2 so I can at least determine
which major component is ba and get over this hump?
Thanks for any thoughts/advice :|
Jay West
12:25 p.m.
Hi, Jay,
*********** REPLY SEPARATOR ***********
On 24-Jan-05 at 17:57 Jay West wrote:
I've got a Data I/O 29b with Unipak2 that is on the
fritz. I thought it
was
working, but it's not.
It frequently reads chips right, then 60 seconds later reads different
values with different checksums. It's sporadic. It never gives any failure
messages (other than bad verify ram to device). It just doesn't get the
right values sometimes.
<snippety>
The most common problems with these units are, like many older computers, dirty or
oxidizing contacts. I would recommend disassembly, cleaning, and anti-corrosion treatment
(Caig's 'GoldGuard,' 'DeOxIt,' etc.) of the edge card paddles and, if
need be, the edge connectors. This should be done for the UniPak as well as the base
unit.
You should also check the power supply voltages for ripple and stability.
Happy digging.
-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner & Head Hardware Heavy,
Blue Feather Technologies -- http://www.bluefeathertech.com
kyrrin (at) bluefeathertech do/t c=o=m
"If Salvador Dali had owned a computer, would it have been equipped with surreal
ports?"
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