Ultimaker 2+ part cooling fans not working

[fboyles 0]

Good afternoon! I could really use some help!! I'm a Dad trying to help my daughters school get this printer working again. I've tried everything that I can think of to get the part cooling fans to come on. Hers's a list of what I have tried so far.

The printer is a Ulitmaker 2+ running ver. 3.3.0

1. I have tried using Cura as well as Simplify3d.
2. Probed the backside of the control board to comfirm that its measuring 24.29v. Another odd bit even when I dial the fan speed down it stays at 24.29%  till I reach to 1% then the  voltage drops to 24.27v.
3. I have powered each motor with an external power supply and they both seem to work as normal.
4. I have also done a continuity test to see if their's a brake in the wires, but everything was fine there too.
5. I have also done a factory reset. which didnt change anything.

With all the testing that I have already done it seems to be a software and not a hardware issue. Any suggestions would be greatly appreciated!! Thanks!!

[fboyles 0]

21 minutes ago, fboyles said:

Good afternoon! I could really use some help!! I'm a Dad trying to help my daughters school get this printer working again. I've tried everything that I can think of to get the part cooling fans to come on. Hers's a list of what I have tried so far.

The printer is a Ulitmaker 2+ running ver. 3.3.0

1. I have tried using Cura as well as Simplify3d.
2. Probed the backside of the control board to comfirm that its measuring 24.29v. Another odd bit even when I dial the fan speed down it stays at 24.29%  till I reach to 1% then the  voltage drops to 24.27v.
3. I have powered each motor with an external power supply and they both seem to work as normal.
4. I have also done a continuity test to see if their's a brake in the wires, but everything was fine there too.
5. I have also done a factory reset. which didnt change anything.

With all the testing that I have already done it seems to be a software and not a hardware issue. Any suggestions would be greatly appreciated!! Thanks!!

I also just tested the fan output on the control board by moving the LED light wires to the fan connector and was able to dim/brighten the leds by turning the wheel controls. When I plugged the fan wires into the LED connector it still wouldn't power the fans??

[stu_le_brew 42]

Firstly you should know that the fans are both 12 Volt wired in series (i.e. the power goes through one then continues through the second) so they have a 24Volt supply from the motherboard

 

Above the print hear there is a join which can be subject to a lot of movement and often can cause breaks in one of the connections so double check here first - even moving the  cables can make the fans work

 

most of the problems I have had with my UM2 (much modified) have been problems with those fans

 

good luck

S