¶ 💡 Compatibility
This article applies to the following model and module. Please take note when referencing:
Model: U1
¶ 📝 Problem Description
1. Mainboard MCU detected power-off signal. System has shut down for protection. Contact technical support.
2. Toolhead 1/2/3/4 MCU detected power-off signal. System has shut down for protection. Contact technical support.
¶ 🔎 Possible Causes
¶ Problem 1
1. The power grid in the machine's environment is unstable.
2. The U1 is plugged into the same power strip as other high-load devices, causing unstable power supply due to fluctuations in other devices' power.
3. The AC power cable or power strip is not properly plugged in.
4. The power loss detection threshold is too sensitive (this is more likely in low-voltage areas).
¶ Problem 2
1. The USB cable of the toolhead is loose.
2. The 16-pin cable between the mainboard and HUB board is loose.
¶ 🛠️ Troubleshooting Steps
¶ Problem 1
1. Check if the external socket is properly connected and ensure both ends of the machine's AC power cable are securely plugged in.
2. Confirm whether your region uses low-voltage power supply (100V-130V) and check if other printers experience similar issues. If so, consider adding a UPS (U1 peak power 1150W, average power 200-400W).
3. If the issue persists, enable Advanced Mode to adjust the power loss detection threshold. The default value is 0.022 seconds, but it can be modified to 0.04 — 0.05 seconds (not exceeding 0.05).
¶ Problem 2
1. Check if the USB cable of the toolhead is securely locked. Swap the USB cables of the toolheads or swap the USB cables with other toolheads to check if the issue moves.
2. Refer to "U1 Removing Side Panel" to remove the right side panel and check if the 16-pin cable between the mainboard and HUB board is loose. The end connected to the mainboard is secured with white glue, so use tweezers or similar tools to remove the glue and disconnect and reconnect this end.
¶ 💬 Contact Support
After following the troubleshooting steps, if you find it difficult to resolve your issue, kindly submit a support ticket through https://snapmaker.formcrafts.com/u1-troubleshooting-request and share your troubleshooting results with some pictures/videos.
Our dedicated support team will be more than willing to assist you in resolving the issue.