about two days ago I wanted to print something as always until I saw the permanent error message about a fallen off front cover. Due to a fully mounted front cover including all magnets I decided to look into the bambu troubleshoot pages. On that pages they mentioned a hall sensor so I decided to look after it and found out that there was no hall sensor but only the soldering contacts. A few moments later I found the hall sensor under the heat bed on the ground. I added two pictures for you guys.
Is it possible to deactivate the front cover check? Is there some way to bypass it or can a normal person soldering the hall sensor back on the circuit board? I can’t print anything because of it.
Replacing hall sensor should be pretty easy for someone with proper equipment and experience to do so. If you are OK with voiding your warranty, you can contact someone who specializes in repairing electronics, for example graphics cards, laptops etc.
Otherwise open ticket with Bambu support and wait for replacement part to arrive. Hopefully you have enough patience, because that’s going to take a weeks 2-3 weeks if you are lucky.
Thanks for the answers. I already opened a ticket two days before but could provide the two pictures above just today. I hope for a quick response.
Soldering is not a problem for me. The only thing is that I didn’t do it with such small components but shouldn’t be problem. What I don’t know is if there is polarity to look for because it’s so small I can’t see any symbols for it.
Can anyone provide a picture with the sensor soldered on?
The footprint on the board for the component shows 3 pins. One on the top and 2 on the bottom. Your part seems to have one pin ( left top) missing. Both pins are bent to the left, so it seems that it was ripped off the board. If indeed one pin is missing, there is no point in soldering it back in.
Google search for hall sensor 9105 datasheet returned following result.
If I was planning to do this repair, I’d
using multimeter make sure that voltage and ground on board are in expected location, check if Vcc is 3.3V
look through catalogue of local shops, if they have suitable replacement in stock
for soldering, it’s practical to have hot air station. Soldering such small components with soldering iron is possible, though quite difficult and I’d personally not do it on any devices, which I’d not be OK to throw away, if I manage to mess things up.
It’s also good to have leaded solder and copper wick, use it to clean pads. Then apply little bit of soldering paste, drop component in place and solder it using hot air. You want the heat to be applied on soldered component only, therefore cover the rest of board with capton tape.
As a bypass it might be possible to solder appropriate resistor divider, which would signal the board, that magnet is present.
Interesting. I had an issue with “front has fallen off” too today. Luckily, I just reseated the front cover and it was OK then. It happened due to failed print - filament was all over the place probably a war was going on inside chamber which might have rugged the front cover a bit.
