Do a factory reset and try again

On Thu, Aug 24, 2023 at 01:46 AM, Rick Crowther wrote:

I meant only to rig up temporary linear supplies on my bench

hello Rick, Hello Hans,

this is exactly what I was aiming for myself: a temporary replacement of the smps boards until all other smoke tests have been succesfully passed.

Hans: really no offence intended! I am of an older school and do not trust these new-age gadgets piloted by software, not because of paranoia, but because of the fact that they do not belong to my trusted analog world. I find the ideas standing behind the SMPS concept of the QMX most refreshing and innovative: this is the main reason I am glad of having purchased a QMX, without having been in need of yet another qrp toy.

But now.. I am sort of discouraged by my own courage and would like to go one step behind into those quiet linear waters I am used to. Not for good, but at least for the first current intake of the fine rig. Afterwards, having thanks to Chris a test checklist for the SMPS boards outside the rig, without danger of damaging the main professor, I would maybe gain some courage and "replace the linear replacement" with it's new age microprofessor controlled switching PS.

This is what I meant. You might help by telling me if this is doable or if I am to expect some latch-up phenomena during power-up due to the fact that the 5V rail would come alive before the 3,3V would do. But latch-ups are not harmfull, so if you do not have an answer to this question, just forget it: I will find it out by myself.

Yours friendly, Razvan dl2arl?

Hi, Chris. Thank you so much for your reply. Here is my PC audio setups for the QDX.

Certainly. Here are my setup pages for Radio and Audio. When I test the CAT, the button does turn green. I am able to change frequencies through WSJT-X.

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Wayne,

Rick,

Second arrived! Been gone all day and just got back. Thanks for the time, effort and the stuff! One going in as soon as I recover from my day trip! Will report soon!

Karl

I can take a look at it for you if you want. ?I’ve fixed about 20 of the QMX rigs for other hams.

OK all. A big plus, but my troubleshooting isn't totally complete, yet. I now can receive and decode! See below for a screen shot. As far as transmit; though, I'm still not there. I can now transmit via the testing menu via putty. I am putting out about 4 watts RF on 20M, but I still cannot get any transmit from WSJT-X or JS8 Call. I have everything in my windows (win11) configurations set to 100%, but still nada. What else should I be looking into?

I have done some more testing and there is power to pin 5 (V_IN) of the Plug-in PCB #1. However, when a long hold of the left encoder is pushed there is no output on on pin #6 of this board. So for some reason Q103 and Q105 are being turned on.

I'll take a look at the PWR_ON line with the scope when I'm back from my birthday lunch -- hi!

PS: Somewhere on the group Hans described the power on sequence for the QMX. Can someone please send me the link to that message - thanks!
--
73, Rick
VE7TK

Website:

Thanks Rick.

I set the supply to 25mA wholly expecting it would immediately trip at the excess current demand of the QMX. BUT the power supply did not trip nor did the meters move off of the peg. So that indicates that no electrons are flowing from the 9VDC supply into the QMX.
--
73, Rick
VE7TK

Website:

?It counted up to a 100 , then I just got a blank screen and the QMX crashed

Taking my own advice I just swapped the CPU that had been involved in the problem back into the set.? ? ?After set-up It all works fine so probably only the 5351 was damaged.

I have used the EFuse products in MIL SATCOM power supply boards and they work great.? Depending upon the model they have under/overvoltage lockout, latching or retry on fault and inrush current control; many even have a fault bit output.
73, Don N2VGU

Well Charles, I thought I wrote a reply, but I can't find it. I did follow your instructions and found I can adjust the output audio. What I find, though, is I can adjust it to get a full bar graph, but then it dros to about 50% over a few seconds. What might that mean?

Wayne

Thanks all. I did look at the schematic when I found continuity all the way around and thought it was all connected, but I needed to make sure. I'm tracking back an issue with my QDX now and am just trying to eliminate potential problems.

Wayne

Hi,
if you measure it outside the board it is fault. If you measure it on-board there should be connection between oll three. Please, see the schematics.

73 Bojan S53DZ

Yes, normal. Look at the schematic. They are all connected.

-mike/w1mt