New Sainsmart Ramps 1.4 controller issue So I have a sainsmart controller I just received and trying to get setup on a Kossel mini but so far I can only get output D8 working which I have setup to run my heated bed and planned to use D9 or D10 for my extruder as per most schematics but so far D9 and D10 are dead. Under pins.h, motherboard type == 33 and if RAMPS_V_1_3 I have this pin configuration: #define HEATER_0_PIN 10 #define HEATER_1_PIN 8 #define HEATER_2_PIN 9 So far no matter what I do only D8 output is working and I have verified this with a volt meter. D9 shows 0 volts but D10 will jump around at 1.5-1.8v even with the pin turned off. https://reprap.org/forum/read.php?219,420991,420991#msg-420991 Sat, 14 Mar 2026 13:15:11 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,420991,421211#msg-421211 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,421211#msg-421211
In the pins header file I found this:

#define ORIG_FAN_PIN 9

I assume I need to make this -1? I plan to start with 120mm PC fans hooked directly up to the 12v power input.

Edit: Got the heated bed and extruder working. This updated pin assignment works well:

#define ORIG_FAN_PIN 10

#define HEATER_0_PIN 9
#define HEATER_1_PIN 8

It seems HEATER_1_PIN is the heated bed (M140) and HEATER_0_PIN is the extruder (M104 T0). I tried to reassign the fan to output on D10 but still it shows a constant voltage of 2-2.3V with and without the fan turned on to S255.

I would really like to get the D10 output working if I'm going to keep this ramps board but a bigger concern right now is the heated bed mosfet gets extremely hot which I have read is common on this brand of ramps using the STP55NF06L. For now I'll add a good fan and eventually replace the mosfets with 3 IRLB8743PBF.]]> ChrisT88 RAMPS Electronics Sat, 18 Oct 2014 14:56:33 -0400 https://reprap.org/forum/read.php?219,420991,421125#msg-421125 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,421125#msg-421125
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dougal1957
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ChrisT88
Yeah I've tried checking the hot end temps by hand as well (carefully of course) and also checking the outputs with a volt meter to be sure. The D8 heated bed output shows voltage correctly but D9 and D10 do not.

That's as maybe but you pic's don't show a thermistor for your hotend being connected to the board without that they won't heat up at all.

I assure you it is. You can see the two all black wires and inside Repetier and Simplify3D I have temps for both the hotend and heat bed showing around 25-26C.

Good thinking though, I will try swapping the thermistor from my heat bed and maybe I'll get some action but since they are both showing up I kind of doubt thats the issue.]]> ChrisT88 RAMPS Electronics Sat, 18 Oct 2014 11:38:00 -0400 https://reprap.org/forum/read.php?219,420991,421105#msg-421105 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,421105#msg-421105
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ChrisT88
Yeah I've tried checking the hot end temps by hand as well (carefully of course) and also checking the outputs with a volt meter to be sure. The D8 heated bed output shows voltage correctly but D9 and D10 do not.

That's as maybe but you pic's don't show a thermistor for your hotend being connected to the board without that they won't heat up at all.]]> dougal1957 RAMPS Electronics Sat, 18 Oct 2014 10:33:57 -0400 https://reprap.org/forum/read.php?219,420991,421104#msg-421104 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,421104#msg-421104 ChrisT88 RAMPS Electronics Sat, 18 Oct 2014 10:28:25 -0400 https://reprap.org/forum/read.php?219,420991,421092#msg-421092 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,421092#msg-421092 vreihen RAMPS Electronics Sat, 18 Oct 2014 09:46:30 -0400 https://reprap.org/forum/read.php?219,420991,420994#msg-420994 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,420994#msg-420994


This picture is when the heated bed is activated:





Finally when the extruder is activated:



Worst case I'll hook the heated bed strait up to my power supply for now and run the extruder off of the D8 ouput until I can get a better quality board. I half expected this kind of problem based on Sainsmart's feedback on these but it was the best option available for free 2 day shipping from Amazon at the time.

I appreciate any feedback.
]]> ChrisT88 RAMPS Electronics Fri, 17 Oct 2014 23:53:45 -0400 https://reprap.org/forum/read.php?219,420991,420993#msg-420993 Re: New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,420993#msg-420993 ChrisT88 RAMPS Electronics Fri, 17 Oct 2014 23:47:32 -0400 https://reprap.org/forum/read.php?219,420991,420991#msg-420991 New Sainsmart Ramps 1.4 controller issue https://reprap.org/forum/read.php?219,420991,420991#msg-420991
Under pins.h, motherboard type == 33 and if RAMPS_V_1_3 I have this pin configuration:

#define HEATER_0_PIN 10
#define HEATER_1_PIN 8
#define HEATER_2_PIN 9

So far no matter what I do only D8 output is working and I have verified this with a volt meter. D9 shows 0 volts but D10 will jump around at 1.5-1.8v even with the pin turned off.]]> ChrisT88 RAMPS Electronics Fri, 17 Oct 2014 23:43:19 -0400