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Re: [APML] More on ST-4 Relays
Chuck,Augie Orland here.
I tried rewiring my ST-4 according to your Modifying the SBIG ST-4 autoguider
for
relayless operation.I did everthing like you explained.
But when I got it all back together and tried it out, nothing happen in R.A. and
Dec.
Everthing else work ok. It show the star on the pixels,the value of the
star,ect.
Execpt when you went to calibrate nothing happen.
Brough it in and rechecked solder joints,they seem to be ok.
Continutiy check out ok. Not sure on this. That is if the jumper wires are tied
in to
some other part of the board.
Also there are several jumper wires on the back of this board. Also a resister
or maybe
its a relay,or capacitor.
Would like to talked to you about this. Maybe send you phone no.And a good
time to call.
Augie
Chuck Vaughn wrote:
> Wil,
>
> >Re sticking relays: In thousands of hours of using an ST4 (two different
> >ST4s) and who knows how many thousands more hours put in by other people I
> >was with, I am yet to see a sticking ST4 relay. If SBIG likewise says
> >they're yet to see one, I'd take that as strong evidence that this is *not*
> >a common problem.
>
> I'm beginning to wonder if SBIG changed the relays since the early days.
> My ST-4 dates from April 1990, probably the first run. My friend who
> also had this problem, has any early one.
>
> Mike mentioned SBIG using reed relays. My relays are not reed relays. I cut
> the top off one and they are a miniature open frame type relay...DPDT.
> Also I've seen a couple of part numbers in this thread and mine are
> different....Midland Ross 190-22B100. The new ones could be identical or
> a different construction.
>
> It may turn out this problem only affected the early units but it did exist.
> When I caught my Dec motor running during the ST-4 integration time, that's
> a stuck relay.
>
> Chuck <aa6g@aa6g.org>
>
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