Hi i have ramps 1.2 with sprinter FW and repsnapper. (Latest build compiled in ubuntu 11.4).
Everything looks fine except heating of extruder. After M104 od heat on button, extruder strats heating, completely ignoring preset values.
M105 returns temperature fine.
M104 S200 looks responding too.
In Printer controls table (repsnapper) is preset value 25°C for extruder and bed and, even if i change it, after M105 repsnapper sets 25 again.
Using 100k thermistor, measured values looks fine.
Tested:
-Tried changing pin 10 to pin 9 (if mosfet is dead) -> same problem
Extruder stays cool, untill i set some temperature or hit "heater on", after it, extruder do not stop heating, even if target temperature is reached and only way to stop it, means to turn power supply off of disconnet repsnapper....
-Another try was with replicatorG, again target temperature is ignored and system continues heating head...
-last try with changing FW, older tonokip do not send back temperature from thermistor at all..
:0(