5 replies

4028 stopped working

I've had a 4028 installed and running for over a year now, yesterday mid print it just stopped, so I changed it out for a new 4028 thinking it died from extended use.

After installing the new 4028 fan, it still won't power up.

I have tried changing the 12v from fan 7 to fan 6 on my Octopus Pro 446 thinking maybe the fan port died. no effect.

I tried changing the PWM pin from !fan_part_cooling_fan to its actual name PA8. no effect

I tried changing it from PA8 (Fan 0) to PD13 (Fan 3) which I use for my chamber heater and the fan works there. no effect

I tried changing the changing the enable_pin from PB10 to PB11 both with and without an ! in front of the pin number. no effect

fan wire > printer
Black > PB11
red > Fan7 12v rail
blue > !fan_part_cooling_pin

Current printer.cfg

[fan]
pin: !fan_part_cooling_pin
enable_pin: PB11 #(HE3)
cycle_time: 0.01

Solution

ok, I checked the voltages at the fan end and there was no continuity from the GND pin in PB11 to the fan.

I went to re-solder the connection and found that the wire was broken 1/2" inside the wire jacket so the original fan did not die the GND wire broke in the jacket and caused it to disconnect.

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