0R resistor on PCB v2.4f - Machine always ON

CNC Machines Nomad
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Hi! I’m Giulio from Italy. In the school where I work we have a Nomad883 PRO, which main board was changed with a spare one after a burn-out event. Once the new board was installed, the machine power up instantly when the power cord is plugged in. I gave a look at the burned PCB (v2.4e) and found the new one (v2.4f) has a 0R resistor soldered near the power/led plug and it seems to bypass the power switch: is this normal? the older (v2.4e) PCB doesn’t have it (it seems someone have de-soldered it). Can I de-solder it in order to restore the power-switch functionality? Thank You in advance for your answer.

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It might be someone could answer here if you posted photos, but the best thing would be for you to contact support@carbide3d.com

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Thank You very much, Mr. Adams. I’ll follow Your suggestion. Thanks anyway to everyone who will answer me; if I’ll solve this problem I’ll update you. Cheers.

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SOLVED !! As Mr. Adams suggested, after speaking whit Mr.Lee at Carbide Support I cutted-out the R47 (0 Ohm) resistor and now the power switch works correctly. Hope this can help. Cheers.

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I am glad for you and your school, Giulio. C3D support is the very best. But am I the only one in the room wondering “in what use case would the power switch be shorted?”… A jumper for testing purposes I could maybe understand, but soldering a shunt across it??

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Hi, Randy… Yes, testing purposes was my first and only option thinking about the presence of this 0R… why soldering it? …Well, I think because it’s probably the fastest and cheaper solution compared to a jumper or something similar… in a large-scale production it may have sense… Or, most simply, someone forgot to desolder it after the testing stage… The only important thing to is Carbide supported me and everything worked well… anyway, desolder this 0R is a mess unless You have specific tools in your lab… This is why I preferred cutting it instead of desolder… Cheers

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…just a li’l funny update about this… take a look at the lower-right side of the motion borad at the Carbide 3D shop (search for Motion Board) and zoom: You’ll see the R37, 0R resistor we’re talking about, soldered on the board… :slight_smile:

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If you are curious, I think you might want to contact support about why your Pro’s behavior is such. All the 2.x boards I see photos of have R37 installed

for example…