+15 volt on +5 volt and visa versa mistake

xlarge wrote:I accidentally shorted +15 to the +5 rail (or the spi clock line).
Had to change most 595s and 165s aswell as the atmega1284.

There was a couple of the 595s and 165s that shorted to ground and i could measure resistance across the pcb to more or less pinpoint which ones.
The atmega1284 was just weird. It worked but did not send out spi clock to the other ics.

Thanks for your reply in this topic. When during the build did you shorted those? While the sequencer was build? Or before? ( just to be sure)

Did you try the machine before you changed all the parts ? Did you get any response of the step lights?

Also could you explain how you did measure resistance across the pcb? I'm kind of new to this.

Thanks a lot!

p.s. Ikke. I think my Atmega may be the only one broken or faulty. It's weird that the stepping lights light up when i put power on the machine. I think that if the 595's or 165 are broken there wouldn't be any lights. But maybe i'm totally off now.

p.s. Ikke. I think my Atmega may be the only one broken or faulty. It's weird that the stepping lights light up when i put power on the machine. I think that if the 595's or 165 are broken there wouldn't be any lights. But maybe i'm totally off now.

I don't know... if the 595s are broken or faulty, they wouldn't do anything or show incorrect LED patterns.
So i'm not sure what it means when they all lit up at the same time...

But i found two others on this forum with the same problem you describe (all step buttons lit) and one of them had a
failing 5 Volt regulator after everything worked properly for months and the other one had a blanco Atmel indeed.

ikke wrote:
p.s. Ikke. I think my Atmega may be the only one broken or faulty. It's weird that the stepping lights light up when i put power on the machine. I think that if the 595's or 165 are broken there wouldn't be any lights. But maybe i'm totally off now.
I don't know... if the 595s are broken or faulty, they wouldn't do anything or show incorrect LED patterns.
So i'm not sure what it means when they all lit up at the same time...

But i found two others on this forum with the same problem you describe (all step buttons lit) and one of them had a
failing 5 Volt regulator after everything worked properly for months and the other one had a blanco Atmel indeed.

Thank you very much. Sorry for the delay.

How can i test the 5 volt regulator? Is just measuring 5 volts enough? Maybe you got a link to the topic? I can't find it.
Blanc Atmel is something that makes sense too. Maybe e-licktronic have send me a blanc one through the friend i bought this kit from.

i think i found that topic:

viewtopic.php?f=16&t=365&p=2439&hilit=atmel#p2439

Thanks!!

I still think it's the Atmel that is bad or not programmed properly.
You're lucky as I'm in the same boat at the moment. My Yocto got bricked by some serious static discharge and got stuck.
No response at all after playing well for months...
I tried to flash it again with an Arduino and an AVR programmer with no results at all.
The AVR programmer reads the Atmel back proper so maybe I miss something or didn't do it the right way.
All step lights are lit and no way to get in Sys-Ex mode. After that I replaced all 165's and 595's with the same result.
So I only have the Atmel left as a suspect.

If you want to test the 5Volt regulator... you can just measure the output of the I/O board between Ground and the 5Volt line.

ikke wrote:I still think it's the Atmel that is bad or not programmed properly.
You're lucky as I'm in the same boat at the moment. My Yocto got bricked by some serious static discharge and got stuck.
No response at all after playing well for months...
I tried to flash it again with an Arduino and an AVR programmer with no results at all.
The AVR programmer reads the Atmel back proper so maybe I miss something or didn't do it the right way.
All step lights are lit and no way to get in Sys-Ex mode. After that I replaced all 165's and 595's with the same result.
So I only have the Atmel left as a suspect.

If you want to test the 5Volt regulator... you can just measure the output of the I/O board between Ground and the 5Volt line.

Thanks! Been busy. But it makes sense that the Atmel is broken because changed the +5 and +15 volt. So it could be the 5 volt circuit of the Atmel couldn't handle the +15 volt.

Do you have ordered a new chip? I want to test one too!

Thanks!