[amsat-bb] G5500 left turn relay failure

[Bob Hammond]

18 years of daily use with only one relay going bad.....is not bad at all!

Bob W7OTJ

On Mon, Oct 19, 2020 at 2:57 PM Gerald Witalec via AMSAT-BB <
amsat-bb at amsat.org> wrote:

>  Just curious, why are so many of you on this board having problems with
> the G5500?Looks like I will  make my own AZ/EL rotor with high torque
> stepper motors and controlledeither with Arduino or Raspberry Pi.
> Jerry...W8RQM
>
>
>
>     On Monday, October 19, 2020, 5:45:18 PM EDT, Ken Swaggart W7KKE via
> AMSAT-BB <amsat-bb at amsat.org> wrote:
>
>  My G5500 control box won't command the rotor left, but right works fine.
> No
> voltage to the #4 connector when I press "left", but if I put some pressure
> on the relay the voltage intermittently returns. So, guess the relay
> contacts are dirty.
>
>
>
> Looking at the schematic it looks like both the right and left relays are
> the same, but use different connections. So. thinking I'll just remove and
> the two and swap relays. (This unit has been in daily use since 2002!)
>
>
>
> Are these relays available from Yaesu or someone in the US? Did a quick
> Google and DigiKey search but didn't find them.
>
>
>
> Just noticed there is a little lid on the top of the relay. When I popped
> that open there is a lot of black residue on the inside of the lid and I
> just might be able to clean the contact!
>
>
>
> Ken, W7KKE
>
>
>
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>