Endstops causing short circuits I've just finished assembling and wiring up my Sintron prusa i3 kit. i uploaded marlin to the arduino, however, i'm having 2 issues. Firstly, whenever i press the endstops, they cause the smoke to come out of the 2 boards, and make the printer reset, Secondly, none of the motors move when i try and move them in pronterface https://reprap.org/forum/read.php?1,622523,622523#msg-622523 Tue, 21 Jul 2026 16:21:03 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?1,622523,622933#msg-622933 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622933#msg-622933 reprap.org] then starting with some very basic shapes, cubes, cylinders that sort of thing to make sure that everything is setup right before leaping in to functional parts. It takes a while to go things dialled in.]]> JamesK General Sun, 07 Feb 2016 16:52:44 -0500 https://reprap.org/forum/read.php?1,622523,622926#msg-622926 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622926#msg-622926 Does anyone have any helpful tips for my first print, i'm gonna print a filment holder that'll mount to the top of the frame.
This one: http://www.thingiverse.com/thing:1300701]]> Mumblemore General Sun, 07 Feb 2016 16:42:50 -0500 https://reprap.org/forum/read.php?1,622523,622920#msg-622920 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622920#msg-622920
Could be a problem with the not used end-stops, In the firmware you should see options to disable the x-max and y-max end-stops.
If you are only using min end-stops then ensure that you home in that direction.

On the board just check that end stops you are using are plugged into the x-min pins.
As what you describe sounds is classic "not told to stop" aka end-stop failing and the motor will keep turning.]]> orictosh General Sun, 07 Feb 2016 16:24:22 -0500 https://reprap.org/forum/read.php?1,622523,622915#msg-622915 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622915#msg-622915 JamesK General Sun, 07 Feb 2016 16:20:53 -0500 https://reprap.org/forum/read.php?1,622523,622910#msg-622910 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622910#msg-622910 Mumblemore General Sun, 07 Feb 2016 16:12:21 -0500 https://reprap.org/forum/read.php?1,622523,622904#msg-622904 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622904#msg-622904 If not check the wiring by touching the two wire connectors together; Send M119 if status is the high then the switch is broken.

You will need to hold the switch closed before sending M119]]> orictosh General Sun, 07 Feb 2016 15:54:53 -0500 https://reprap.org/forum/read.php?1,622523,622897#msg-622897 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622897#msg-622897 However, i've tried to get the X-axis to home it self, however, it slids along, but doesn't stop moving, it keeps moving, and i have the turn it off before if damages something, i thought it was because it was reversed, so i flipped the connector, but the same thing happens, even after it hits the endstop.
Any suggestions?]]> Mumblemore General Sun, 07 Feb 2016 15:36:54 -0500 https://reprap.org/forum/read.php?1,622523,622876#msg-622876 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622876#msg-622876 JamesK General Sun, 07 Feb 2016 14:35:39 -0500 https://reprap.org/forum/read.php?1,622523,622868#msg-622868 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622868#msg-622868 Mumblemore General Sun, 07 Feb 2016 14:26:18 -0500 https://reprap.org/forum/read.php?1,622523,622815#msg-622815 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622815#msg-622815
Quote
Mumblemore
I've just hooked up the HBP thermistor to the hotend connections (T1) and it is reading temperature, so i assume i've damaged the thermistor somehow, not sure what i could've done to damage it, but nothing can help that now,

Also, i've managed to get the motors to move about, using both the LCD and pronterface, however, they move in the reverse of how they should, is it safe to reverse the connections of the motors on the RAMPS?

It's better to change the direction (I think the homing direction) in the firmware Turn off all power to the board and motors before this but you can just turn the stepper connectors 180 degrees.
It's only safe to unplug the stepper drivers when the main power is not on. If you do it with power on, you will damage the stepper motors.]]> orictosh General Sun, 07 Feb 2016 13:01:52 -0500 https://reprap.org/forum/read.php?1,622523,622800#msg-622800 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622800#msg-622800
Also, i've managed to get the motors to move about, using both the LCD and pronterface, however, they move in the reverse of how they should, is it safe to reverse the connections of the motors on the RAMPS?]]> Mumblemore General Sun, 07 Feb 2016 12:38:47 -0500 https://reprap.org/forum/read.php?1,622523,622742#msg-622742 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622742#msg-622742 >>> gettemp
Hotend: 0/0

which i assume is bad, and that it isn't reading the any temperature]]> Mumblemore General Sun, 07 Feb 2016 10:53:00 -0500 https://reprap.org/forum/read.php?1,622523,622720#msg-622720 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622720#msg-622720 Dust General Sun, 07 Feb 2016 10:18:46 -0500 https://reprap.org/forum/read.php?1,622523,622707#msg-622707 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622707#msg-622707 i don't think it's the thermistor, because i can't even feel a difference in the temperature in the HBP or hotend after about 10 mins
i even got my gas soldering iron and ran the flame over the bed near the thermistor (not over it, i'm not that stupid) and the temperature of the bed went up (i let it go to 30 degreses C) on both the LCD and in pronterface.]]> Mumblemore General Sun, 07 Feb 2016 09:47:38 -0500 https://reprap.org/forum/read.php?1,622523,622681#msg-622681 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622681#msg-622681
The temperature error probably means that the thermistor isn't connected, or possibly is short circuit, or the firmware thinks there are more thermistors than are actually fitted.]]> JamesK General Sun, 07 Feb 2016 08:24:29 -0500 https://reprap.org/forum/read.php?1,622523,622678#msg-622678 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622678#msg-622678 SENDING:M119
Reporting endstop status
x_min: open
x_max: open
y_min: open
y_max: open
z_min: open
z_max: open
Thats what comes out]]> Mumblemore General Sun, 07 Feb 2016 08:16:13 -0500 https://reprap.org/forum/read.php?1,622523,622677#msg-622677 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622677#msg-622677
Quote
Mumblemore
out of curiosity, should they spit out any information into pronterface when pressed or not?
Send M119 to get the current status of the enstops]]> Srek General Sun, 07 Feb 2016 08:11:02 -0500 https://reprap.org/forum/read.php?1,622523,622673#msg-622673 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622673#msg-622673
I've unplugged the yellow wire (V+) and it seems to have fixed the endstops, out of curiosity, should they spit out any information into pronterface when pressed or not?
And with the motors, the only error that gets sent out by pronterface is:
"Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)"]]> Mumblemore General Sun, 07 Feb 2016 08:00:54 -0500 https://reprap.org/forum/read.php?1,622523,622549#msg-622549 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622549#msg-622549 If you plug them in the correct way around, they work fine. If you plug them in backwards, you short +5v to ground via the closed switch and smoke the voltage regulator.
Sadly there is no key on this connector... so people plug them in any way they want.


If smoke has come out you have probably damaged the 5v regulator on the mega and need to replace it.]]> Dust General Sat, 06 Feb 2016 23:22:12 -0500 https://reprap.org/forum/read.php?1,622523,622534#msg-622534 Re: Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622534#msg-622534
We'll need more info to figure out the motors, but let's get the endstops working first.]]> JamesK General Sat, 06 Feb 2016 21:31:37 -0500 https://reprap.org/forum/read.php?1,622523,622523#msg-622523 Endstops causing short circuits https://reprap.org/forum/read.php?1,622523,622523#msg-622523 i uploaded marlin to the arduino, however, i'm having 2 issues.
Firstly, whenever i press the endstops, they cause the smoke to come out of the 2 boards, and make the printer reset,

Secondly, none of the motors move when i try and move them in pronterface]]> Mumblemore General Sat, 06 Feb 2016 19:08:24 -0500