Troubleshooting Chance PI

[Borisimo]

So I have just cut through the wires to the switch panel.

Unfortunately this hasn't changed anything, it is still behaving as in the video. https://youtu.be/bNMcsIPleEk

Boris

[baum7154]

Did you do a power down and a power up after the cut?

[Borisimo]

Cut when switched off, so powered up afterwards.

[baum7154]

Ok Boris, after looking at the pictures you first provided it looks like the C11 & C17 capacitors appear a bit physically large to be 22picofarad, can you please confirm their value? They are on either side of the quartz crystal.

[6666]

So I have just cut through the wires to the switch panel.

Unfortunately this hasn't changed anything, it is still behaving as in the video. https://youtu.be/bNMcsIPleEk

Boris

Hi My question was really just a preliminary question

the point of the question was to see if you had hard wired the switches or used a plug,

where I was heading, was to see if you could easily unplug the switches to check that one
of them was not putting a permanent earth on the uC, but as you have cut the wires
that theory has been eliminated .

[6666]

Did you insert the link under U4 ?

[Borisimo]

Thanks again for your responses.

Values of capacitors C11 and C17 = '22J6KV54 marked on the caps which I believe is 22pf (very similar to) http://www.ebid.net/us/for-sale/1-pc...-136169833.htm

Link under U4 - Yes, but not very elegant. I added it to the back of the board, having already put the U4 socket in place.

Boris

[baum7154]

There is a decimal point at the upper left of the 22J designator and I am not sure of its meaning. Could it be that it means .22uf? If not, why is it there? I would be tempted to remove both 22pf caps and see the result.

Dan

[Borisimo]

So....finally removed C17 and C11, but no effect I'm afraid, still the same as the previous video in post #16. (I did wonder if they were physically large due to the 63 KV rating?)

I have a 'virtual' scope now so is there anything that I can test that would throw light on the situation?

Another question I have is that I built this board in a house that has an old and slightly questionable electrical system (for example appliances give you a shock if you don't wear rubber soled shoes). Could this have damaged components during the build?

[baum7154]

Boris,
I would examine each component value and its proper orientation for diodes, transistors, electrolytic caps, ICs, and the switches. I would clean up any solder joints that are not smooth and shiny. I don't know if it would help if I posted closeup pictures of my working board component side and trace side for a little 'stare and compare' with yours. I'll try to get that done tomorrow.

Good luck,

Dan

[baum7154]

Photos of CHANCE - V1 Component Side and Trace side

Attached here are the promised photos of my fully operational CHANCE V1. The toroidal inductor is a modification to improve current to the detector. The extra resistor in series with the 390 ohm resistor is there to optimize damping of a fast 3DSS cool. Sorry for the late delivery of these pictures.






Regards,

Dan

[6666]

Hi Dan
your pictures are only 360x270 and a bit too small to see much component detail, any chance you could make them bigger thanks.

[baum7154]

Where do I set the image size in this thread?

[6666]

The width and height of your picture is set in your camera, then just attach the picture, I think there is limit to the file size in bytes, but cannot see where that is listed right now

[baum7154]

I looked in settings for my IPOD but didn't see any for image size. I'll try something different tonight.