Hi, I need some help before i might burn my printrboard.

3D Printing
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Hi, I need some help before i might burn my printrboard.
Do i just connect them ( orders doesn’t matters) or there is a rule for that?
the last time i connect cables was to light a bulb, yes i’m that clueless in electric things. Thanks!

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You need proper voltage, amperage, and polarity…or an extra board when you get it wrong!

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As @Mike_Miller said the first thing is to look for the voltage and amperage. Then on the power supply end figure out which wire is the positive and which one is the negative. and match that to the board pinout.

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@Mike_Miller I’m connecting to 12V 10A laptop power adaptor.

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@Andre_Courchesne1 as this might sound stupid for grown up, how do I test the positive-negative? thanks for the patience

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@Greg_son You have access to a volt meter ?

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Or a led :slight_smile:

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Would have to be a 12v LED :wink:

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Or a resistor :slight_smile:

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@Peter_Knudsen Looks like he already cut the plug and put in crimps

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Order here is relevant (other than with a lightbulb). You need to figure out which one of those two unmarked leads is your +12V and which one is ground. The best way to do this - as already indicated - is to use a voltmeter. Measuring between the two leads with the supply plugged in you should get either +12V, in which case the positive probe is connected to the lead with 12v, or it reads -12V, in which case the COM probe is connected to the 12V lead. Connect that one too the yellow cable (everyone else, please correct me if I’m wrong here, going by the color conventions here!), the other one to the black cable. Before plugging in, measure again with the voltmeter to make sure yellow is 12v and black is ground.

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12v 10a is 120 watts, isn’t it? That doesn’t seem like enough to power a printer. (The Xbox power supply commonly in use is 205 watts and I want to think it couldn’t run four servos, an extruder AND a heated bed at the same time. ) believe me, this is a measure twice and cut once situation!

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voltage test, 4 leds wired together. Guerilla Electronics rule for LEDS is 3 volts per LED, or Guerilla electronics rule is 1 led and 470 ohm resistor doe 12V, 1 led and 220 ohm for 5v, about half the cost of a harbor freight voltmeter.

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@Mike_Miller , I run a 6A supply. But my bed has power from the wall. :sunglasses:

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my bed cause I wanted rapid heating, is wired to its own 24v power supply, i use the line from the ramps in to a 7805, the 7805 then goes in to a relay, and the relay is what connects the 24v untill desired temp. i go from 21 to 210c in ten minutes on a 300 x 300mm bed.

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Man…that’s toasty!

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ok so here’s what happen, geeetech’s printrboard apparently flip the power in their board (duuh!) so i make a mistake connecting the positive cable.

http://1.it doesnt turn on for 2 second

  1. i immediately realize and inverted it and it turn on

  2. laptop recognizing the com port and can connect to repetier but cannot do anything, im thinking this is because it doesnt have firmware, no?

  3. i can’t load the bootloader mode, I put the jumper and press the reset but nothing happen.

  4. I tried to load marlin firmware according to printrbot instruction, it verify but never finish uploading to I/O board

anyone experienced with geeetech printrboard? does it already have bootloader?
How can I check it?

Im afraid i might already destroy my board because of their stupid inverted power connections

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Yep, you already destroyed the board.