Hi - I'm getting an odd temp reading on the extrude head of my reprap mendel.
The reason I'm at this point is because I was getting MINTEMP warnings and realised something was awry - so I replaced the resistor first then the thermistor, hit the temp buttons and the thermistor went pop as it reached 200c - might have been a dodgy component - kinda doubt it though and has never done that before. I seem to get through resistors but not thermistors.
Startup is using:-
M304 H0 B3480 R4700 T10000
M304 H1 B3960 R4700 T100000
M105 gives me:-
ok T:47.0 /-273.1 B:20.6 /-273.1 @:0
I'm pretty certain the room temp is closer to 20.6 than 47!
So to test I swapped the board connections over and sent the following:-
M304 H1 B3480 R4700 T10000
M304 H0 B3960 R4700 T100000
M105 gives me:-
ok T:23.1 /-273.1 B:19.3 /-273.1 @:0
These look closer to reality and understand thermistors are more accurate at working temps so I'm fairly happy with these.
Meter readings (@200k) on sensors are:-
Bed 12.5
Heater 128
The question is, can I run the printer with sensors switched and why the odd readings?
Thoughts?
Edited 1 time(s). Last edit at 12/29/2013 12:18PM by spezzer.
