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hot end stays cold

Posted by new-3d

new-3d

hot end stays cold
January 02, 2014 01:20PM

Registered: 10 years ago
Posts: 8

hope there is some advice

Last print 2 days ago worked great.

today I started the ormerod again and the hot end stays cold.
the resistance at the wiring (cable end at the duet): heater: 3.5Ohm (one brown to one yellow), thermistor 140kOhm;

reset or plugin out/in of the cables doesn't help
bed temperature is working

Reply Quote

dc42

Re: hot end stays cold
January 02, 2014 01:50PM

Registered: 10 years ago
Posts: 14,672

Right above the hot end heater connector is the mosfet that controls it, and next to the mosfet is an LED (D7) and resistor. Does the LED come on when you command the heater on?

If the LED doesn't come on and you have a DMM then you could also check the voltages on the mosfet. Should be +12V on the drain with the heater off, 0V when on. The gate should be +5V when on, 0V when off. Source at 0V all the time.

Edited 2 time(s). Last edit at 01/02/2014 01:51PM by dc42.

Large delta printer [miscsolutions.wordpress.com], E3D tool changer, Robotdigg SCARA printer, Crane Quad and Ormerod

Disclosure: I design Duet electronics and work on RepRapFirmware, [duet3d.com].