Help with J-head and thermistor not working Mega+ Ramps+ Marlin.I had the J-head running before, but had to update the firmware.In Repetier if I turn on the hotend. nothing happens. At the bottom of Repetier, it shows Extruder: 478.00 C/Off.When I turn it on, i don't get a light on the ramps and the j-head does not get warm. Any thoghts? https://reprap.org/forum/read.php?13,255753,255753#msg-255753 Sat, 18 Jul 2026 20:33:40 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?13,255753,255911#msg-255911 Re: Help with J-head and thermistor not working https://reprap.org/forum/read.php?13,255753,255911#msg-255911 nophead Controllers Thu, 17 Oct 2013 10:04:37 -0400 https://reprap.org/forum/read.php?13,255753,255844#msg-255844 Re: Help with J-head and thermistor not working https://reprap.org/forum/read.php?13,255753,255844#msg-255844
Could be a faulty ramps, there are a few components... Could be faulty ramps ADC pin.

Swap the HBP thermistor cable with the hot end thermistor cable, Does the fault move? or stay? (now put it back before you forget)]]> Dust Controllers Thu, 17 Oct 2013 06:53:02 -0400 https://reprap.org/forum/read.php?13,255753,255763#msg-255763 Re: Help with J-head and thermistor not working https://reprap.org/forum/read.php?13,255753,255763#msg-255763 disneytoy Controllers Thu, 17 Oct 2013 01:54:59 -0400 https://reprap.org/forum/read.php?13,255753,255756#msg-255756 Re: Help with J-head and thermistor not working https://reprap.org/forum/read.php?13,255753,255756#msg-255756 Should be about 100k at 25c.]]> Dust Controllers Thu, 17 Oct 2013 01:01:40 -0400 https://reprap.org/forum/read.php?13,255753,255753#msg-255753 Help with J-head and thermistor not working https://reprap.org/forum/read.php?13,255753,255753#msg-255753
Any thoghts?]]> disneytoy Controllers Thu, 17 Oct 2013 00:32:31 -0400