[time-nuts] update on Z3801A repairs

paul swed paulswedb at gmail.com
Sun Feb 7 17:14:10 EST 2016


Congratulations Dave very good to hear its back in the land of the living.
Looking forward to the additional thread.
Regards
Paul
WB8TSL

On Sun, Feb 7, 2016 at 12:37 PM, Artek Manuals <Manuals at artekmanuals.com>
wrote:

> I had reported earlier that the power supply went south in my Z3801A ( and
> then the receiver) became a suspect as well
>
> In the final analysis I am not sure which went first the Z3801 supply or
> the external power supply I use to power the unit.Both have a clear
> failures.But both were down creating a little confusion at first about the
> problem
>
> The external supply has an adjustable current limit setting which is now
> nonadjustable at 150ma..have not dug into that one yet
>
> Once I figured out that my external supply was bust I switched to another
> supply I have here in the lab to find that the internal Z3801A supply still
> had a problem. As I noted in an earlier post there is a "pre processing"
> section  which I am told was really a over-voltage protection section and
> the DC-DC converter section. The problem fortunately is in the the voltage
> protection section and I have not bothered to run it down.Instead I  have
> reverted for now to bypassing the front end of the supply and am now
> feeding 36V directly into the DC/DC converter an easy thing to do at the
> output of L1 with a simple and convenient trace cut. SO not sure which
> supply took out which supply but for now the unit is powered on another
> supply .with the overkil / over-voltage circuit bypassed
>
> A few days after I started things back up the receiver began to error out.
> At first it would  error after 8 hours, then after an hour and now it only
> lasts about 20 minutes. Again no obvious suspects on the receiver board in
> terms of smoked caps etc. At that point another list member who has a cache
> of Motorola Oncore boards that I knew well from another list offered to
> send me a replacement Moto receiver, which turned out to be plug and play
> compatible. the new-used receiver fixed the problem in spades so we are
> back with a working Z3801A. I will cover the receiver update from an Moto
> 6CH Oncore to a 8CH VP Oncore in a separate post
> --
> Dave
> Manuals at ArtekManuals.com
> www.ArtekManuals.com
>
> ---
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