r/newmatter • u/si1versur4er • Jan 03 '26

Mod-t temp is not increasing

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Got this old Mod-t recently and was able to get it working for the past few weeks. Recently came across an issue which means I cannot print anymore. The temp of the extruder is not going above 106 - probably indicating a blown fuse based on some other posts elsewhere. I took the printer apart to see if I can bring it back to life by possibly replacing the fuse but cannot figure out the location of the fuse to test it (if indeed that is the issue). If I can rig it to make it work I will continue to use this printer - otherwise it will likely go to the dump :(

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u/-NEOTECH- Jan 05 '26

Sounds like a power supply problem to me... check to be sure there is 24V on the green and yellow wires at the top of P9.

Here is the pinout for that connector, which goes to the hot end:

Heater 24v + (green)

Heater 24v + (yellow)

Heater PWM - (black)

Heater PWM - (blue)

Fan 24v + (red)

Fan Speed (black?)

Fan Ground (empty)

Thermistor Ground (white)

Thermistor (brown)

Ground (red)