HMS_0500_0300_0001_0002: The toolhead is malfunctioning. Please restart the device.
The HMS message happens when AP detects the tool head module malfunctioning.
When this issue happens, all operations related to MC will malfunction, such as:
Check the communication between the AP and TH board, including AP→MC, MC→TH.
For P1, please also check whether the seat of the tool head cable is soldered. Please contact our after-sales service if the seat is floating and falsely welded.
The MC-TH connector is directional, so please ensure the socket is inserted correctly. If inserted in reverse, it will cause a power short circuit, resulting in the printer reporting an HMS error or inability to power on properly.