Last night I finished printing all the parts for my HeroMe Gen 5 hot end. I decided to just chop off the existing fans and then solder on a JST XH connector to make it easy to change the fans over in the future.
I did the part cooling (adjustable) fan first and it was working great. I then did the same for the nozzle/heatsink fan, but when I plugged in the fan it just didn't work. I checked the voltages on the JST connector pins and they were reading 22.8 V. I thought that was odd, because I'm sure when I checked at the board before I installed the fan it was showing 24 V.
I tested the part cooling fan again and it now no longer works. I checked it's pins on the JST connector and the board and it to is showing 22.8 V.
I checked both adjustable fan sockets on the board and both are showing 22.8 V when the fan is set to 100 %.
When I check the voltage on the fans themselves they're showing 1.5 V between the ground and positive. I didn't read this value when it was working, so I'm sure if this is expected. And unless I have a batch of 6 dodgy fans, I think it must be the printer.
Without trying to lead the answer as to why, I have a feeling at some point during the nozzle fan install, after I tested the fan was working by putting the wires straight into the fans JST connector, i.e. before I soldered, I may have touched the 24 V ground and positive wires together when the printer was on, but I'm not certain. But wouldn't this have tripped a fuse and then be showing 0 V?
What have I broken or how can I work out what's broken?
Please note, I don't understand electronics very well, but I checked the continuity of the PSU input + to the Fan + for the nozzle fan. It shows as 1, which I believe means no connection. If I connect - to -, then it reads 0 which I think means good.
So I guess I've burnt a connection between the Fan + and the PSU + if I understand that right?