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ramps 1.6 + servos ?

Posted by davidmarli 
ramps 1.6 + servos ?
April 19, 2018 01:52AM
Hi,

I just bought a ramps 1.6. It seems great, but when I plug my bltouch in servo, nothing lights on...
With my multimeter, there is no 12v between + and - but 0v...
So is there something to do to have power on servos ?

I see 2 pins with no connectors J4 (betwwen the two green connector) is that the solution ?
I find nothing about this ramps 1.6

Thank a lot.
Re: ramps 1.6 + servos ?
April 19, 2018 04:56AM
Servos can be very power hungry, that's why they can be fed from an external 5V source instead of the weak internal 5V reulator. This is usually selectable by a jumper ( which seems to be missing in your case )

BTW: I've never heard of RAMPS1.6, would be nice to add some more info...
Re: ramps 1.6 + servos ?
April 19, 2018 05:25AM
ramps 1.6 is not open source... so no documentation.. (Shakes fist at manufacturer!!)

On a normal ramps there is no voltage on the +5v pins of the servo lines until it gets jumpered to vcc

most servos are not 12v... so I would be careful trying to get 12v there...

The image I see does show a track going from the +v line to somewhere.. but cant see where...
Re: ramps 1.6 + servos ?
April 19, 2018 05:28AM
@o_lampe

Its a bigtreetech only board.

violates gpl, no documentation

avoid at all costs
Re: ramps 1.6 + servos ?
August 30, 2018 07:55AM
Created an account just to reply to this!

After a bit of multimeter probing, I found that they moved the servo power jumper right next to the E0 servo header. Putting the jumper over the center pin and the pin closest to the E0 header supplies the servo header with 5v.
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