Blown 7i76e

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28 Aug 2021 08:18 - 28 Aug 2021 08:25 #218964 by AngryDwarf79
Blown 7i76e was created by AngryDwarf79
So today I did a dumb on my 7i76e and accidentally shorted the 24V and 5V together via an Estop.... that acrid smell of stupidity lingers....

So far all that looks failed is PTC3 - does anyone know what component it is?

Hopefully I haven't made an expensive ornament....
Last edit: 28 Aug 2021 08:25 by AngryDwarf79.

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28 Aug 2021 12:19 #218989 by Aciera
Replied by Aciera on topic Blown 7i76e
Presumably a PTC resistor that protects the circuit from overcurrent. But maybe wait for PCW to confirm.

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28 Aug 2021 12:31 #218992 by tommylight
Replied by tommylight on topic Blown 7i76e
I would not worry to much, yet, Mesa has the best support on Earth.

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28 Aug 2021 14:12 #219005 by PCW
Replied by PCW on topic Blown 7i76e
Yes. that part is a 2A 1206 size PTC to protect the external 5V wiring of
TB2 from shorts.

If the logic side or the 7I76E still powers up (red LED flashes briefly and then
extinguishes on power-on ) It may be OK to just replace the PTC
The following user(s) said Thank You: AngryDwarf79

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28 Aug 2021 22:45 - 28 Aug 2021 23:30 #219051 by AngryDwarf79
Replied by AngryDwarf79 on topic Blown 7i76e
Thanks - unfortunately the only light I get at any time is the orange field power led :( Seems I may have done more damage than I can see.

Assume the PTC is 6V? Might order anyway - can't break it more :)

No 7i76e in stock at the moment - seems the closest replacement would be 7i96 + 7i84 (need 4x stepper, 1 encoder, ~20 inputs)

[ed - found 7i76ed to substitute in whilst attempt to rectify this one.... not using any outputs atm so should be direct plug in]
Last edit: 28 Aug 2021 23:30 by AngryDwarf79.

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