1 Topic by veehoo

  • veehoo
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Topic: Power problem with stock SD4 printrboard (rev e)

Hello,

I've got an odd issue with powering my SD4. It's always been the case that my SD4 gets powered up (i.e leds light up) only when the printrboard is in its 'right' place, i.e so that the usb and power plugs stick out from the back of the frame. If I've tried to power the printer so that the board is loose, it wouldn't power on, and I've never been able to explain this phenomenon.

I now started a heat bed (pcb) and psu upgrade project, which includes an SSR. And when I started testing the printer after upgrade, I can't seem to get the system powered up. I've since removed the SSR and gone back to the original PSU, but the problem remains. With the folowing exception: I did the mod yesterday, strugled for a bit without getting to work and then gave up. Today I started where I left of yesterday, and the printer would power up for maybe 30 seconds, before cutting power again. And after that, after numerous trials, no sign of life.

I measured the voltage seen by the system, and it explains the problem. With the original PSU, SSR disabled, I measure 12,5V from the barrel connector, but after plugging in and measuring from the power plug on the board, I can only measure 480mV. But I can't really explaing where the current goes, nothing gets hot.

I'm clueless at the moment, so any ideas are very welcome.

br, veehoo

2 Reply by wardjr

  • wardjr
  • wardjr
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Re: Power problem with stock SD4 printrboard (rev e)

Bad PSU or connection,  both fairly common issues.

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website

3 Reply by veehoo

  • veehoo
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Re: Power problem with stock SD4 printrboard (rev e)

You're correct sir wink

The barrel connector seems to be really picky wrt its orientation on the plug. Now, how do I desolder that from the board and connect the wires straight to the board... the desoldering seems difficult...

4 Reply by wardjr

  • wardjr
  • wardjr
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Re: Power problem with stock SD4 printrboard (rev e)

It's rather easy actually, I prefer a solder sucker but solder whick works well also.  Search YouTube as I'm sure someone has a how to video posted.  You may also be able to simply heat and slowly remove it from the board.  Then simply re heat to insert your wires.  A good soldering iron with the proper tip is a great place to start wink
Good luck!!!

Printit Industries Model 8.10 fully enclosed CoreXY, Chamber heat
3-SD3's & a Workbench all fully enclosed, RH-Slic3r Win7pro, E3D V6, Volcano & Cyclops Hot End
SSR/500W AC Heated Glass Bed, Linear bearings on SS rods. Direct Drive Y-axis, BulldogXL
Thanks to all for your contributions

wardjr's Website