warning: ramps boards with bypassed jumper Hi, I have just bought several RAmPS 1.4 boards from different vendors and many of those boards had the jumper for choosing the microstepping bypassed under the header which make the jumper completely useless (see picture). Why would they bypass a jumper with a track on the PCB and still solder the header to put a jumper is beyond my comprehesion but this can certainly lead to problems if you are not using the 16 microsteps default. Cheers, Erik https://reprap.org/forum/read.php?219,507642,507642#msg-507642 Fri, 15 May 2026 07:30:48 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,507642,713603#msg-713603 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,713603#msg-713603
I have one of those too.

Unfortunately i don't have a program that can open the original PCB files from [www.reprap.org] to see if the bridge is present there.

I might believe this was done by some cheapskate just to save on pin headers/jumpers, but failed to tell all the DIYers selling these boards on eBay that the jumpers are not needed. :D
After all, if you cut one wire, you can always fix it by soldering a header later. And if you are not experimenting with it, then the three jumper configuration is just constant. No need to spend jumpers to it.

My board says "Robotale" and has this problem.
[attachment 84867 20161013_134725.jpg]

Also, it reads HIF_Team there and you can see the bridge between pins is there.
[attachment 84868 hif.jpg]

EDIT: Checked those files from wiki and they are not bridged.]]> Veesta RAMPS Electronics Thu, 13 Oct 2016 07:20:47 -0400 https://reprap.org/forum/read.php?219,507642,713538#msg-713538 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,713538#msg-713538 billyb2 RAMPS Electronics Wed, 12 Oct 2016 21:30:01 -0400 https://reprap.org/forum/read.php?219,507642,658298#msg-658298 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,658298#msg-658298 o_lampe RAMPS Electronics Fri, 29 Apr 2016 07:44:49 -0400 https://reprap.org/forum/read.php?219,507642,657323#msg-657323 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,657323#msg-657323
Quote
o_lampe
I took a single LiPo battery and simply burnt away the traces by shortcutting them with the battery. No need to pull off the plastic or anything.

Super!!

But the first two pins are connected to something on the board, I measured resistence after cutting the trace..
So this could be a risk..]]> pieri70 RAMPS Electronics Wed, 27 Apr 2016 05:00:53 -0400 https://reprap.org/forum/read.php?219,507642,657318#msg-657318 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,657318#msg-657318 o_lampe RAMPS Electronics Wed, 27 Apr 2016 04:52:21 -0400 https://reprap.org/forum/read.php?219,507642,656975#msg-656975 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,656975#msg-656975 same situation here...
To control you must verify with a multimeter with board alone and control the circuit between pair of pins is open.

I didn't desolder all the pins.
You can use a plier to pull away all plastic bases from the 6 pins and then use a cutter.





]]> pieri70 RAMPS Electronics Tue, 26 Apr 2016 08:06:29 -0400 https://reprap.org/forum/read.php?219,507642,507733#msg-507733 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,507733#msg-507733 edfrombordeaux RAMPS Electronics Mon, 11 May 2015 12:00:55 -0400 https://reprap.org/forum/read.php?219,507642,507686#msg-507686 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,507686#msg-507686 cdru RAMPS Electronics Mon, 11 May 2015 09:24:34 -0400 https://reprap.org/forum/read.php?219,507642,507675#msg-507675 Re: warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,507675#msg-507675 AndrewBCN RAMPS Electronics Mon, 11 May 2015 08:56:32 -0400 https://reprap.org/forum/read.php?219,507642,507642#msg-507642 warning: ramps boards with bypassed jumper https://reprap.org/forum/read.php?219,507642,507642#msg-507642 I have just bought several RAmPS 1.4 boards from different vendors and many of those boards had the jumper for choosing the microstepping bypassed under the header which make the jumper completely useless (see picture). Why would they bypass a jumper with a track on the PCB and still solder the header to put a jumper is beyond my comprehesion but this can certainly lead to problems if you are not using the 16 microsteps default.

Cheers,

Erik]]> edfrombordeaux RAMPS Electronics Mon, 11 May 2015 07:41:33 -0400