Design fault ? Having a problem with driving extruder motor-driver. It seems that there is a design fault on the RAMPS 1.6 board and schematic. |RST and |SLP pins are connected together, but not to anything else. These pins are therefore floating. On my particular bpoard, those pins on the 3 axes ARE pulled HIGH. [github.com] Looking further, Typical circuit for the A4988 has 5k pullup on SLP. https://reprap.org/forum/read.php?1,897682,897682#msg-897682 Thu, 08 Oct 2026 21:23:05 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,897682,897684#msg-897684 Re: Design fault ? https://reprap.org/forum/read.php?1,897682,897684#msg-897684 2 of my 10 modules are faulty. I accidently ordered 2 packs of 5. RST/SLP are floating at about 1.3V]]> sbkenn General Wed, 29 Jul 2026 13:26:28 -0400 https://reprap.org/forum/read.php?1,897682,897683#msg-897683 Re: Design fault ? https://reprap.org/forum/read.php?1,897682,897683#msg-897683
A4988's module, for example, has a built-in pull-up on the sleep pin


]]> Dust General Wed, 29 Jul 2026 10:34:45 -0400 https://reprap.org/forum/read.php?1,897682,897682#msg-897682 Design fault ? https://reprap.org/forum/read.php?1,897682,897682#msg-897682 It seems that there is a design fault on the RAMPS 1.6 board and schematic.
|RST and |SLP pins are connected together, but not to anything else. These pins are therefore floating. On my particular bpoard, those pins on the 3 axes ARE pulled HIGH.
[github.com]
Looking further, Typical circuit for the A4988 has 5k pullup on SLP.]]> sbkenn General Wed, 29 Jul 2026 09:52:57 -0400