¶ Issue Description
A force sensor is installed above each hotend on the left and right sides of the toolhead, designed to detect the extrusion force applied by the hotend. Additionally, the force sensor is crucial for functions such as homing, leveling, nozzle Z offset calibration, and dynamic flow calibration. When the MC board fails to receive signals from the force sensor, this alarm is triggered.
Possible reasons for HMS activation include:
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Damage to the force sensor (including the eddy current coil and signal cable).
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Disconnection of the force sensor signal cable from the TH board.
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Communication anomalies within the chips on the TH board.
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Communication anomalies between the TH board and the MC board.
¶ Troubleshooting
¶ Tools, Equipment and Materials
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H2.0 Allen key
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H1.5 Allen key
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Flat-head tweezers
¶ Fault Isolation Process
Please investigate the left and right extrusion force sensor anomalies based on the fault prompt.
¶ Solutions
Users may adjust the order of these solutions as needed.
¶ Solutions
Users may adjust the order of these solutions as needed.
¶ Step 1. Restart the Printer
After restarting, perform Step 6 (Homing test). If no alarm is generated, it may be that the communication between the TH board cores is abnormal, and the problem has been solved by restarting.
If the alarm still occurs, proceed to Step 2.
¶ Step 2. Check the hotend temperature display
If the actual temperatures of the left and right hotends both display as 0, it indicates a communication anomaly between the MC board and TH board. Proceed to Step 3.
If the hotend temperature display is normal, it indicates normal communication between the MC board and TH board, and the issue lies with the extrusion force sensor itself or its signal line. Proceed to Step 4.
¶ Step 3. MC-TH communication abnomaly troubleshooting
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Refer to Disassemble the H2D toolhead Steps 1 to 6 to expose the TH board. Check if the MC-TH connector on the TH board is properly installed and re-plug if necessary.
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Refer to Replace H2D Rear Panel to disassemble the printer rear panel. Check if the MC-TH connector on the MC board is properly installed and re-plug if necessary.
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After installing the toolhead-related electronic components, check Step 2 to see if the hotend temperature display is normal. If not, submit a ticket to contact customer service.
¶ Step 4. Extrusion force sensor connection check
Refer to How to Disassemble and Assemble H2D Toolhead Steps 1 to 6 to expose the TH board. Check if the extrusion force sensor connection is properly installed and re-plug if necessary.
After assembly, perform Step 6 for the homing test. If the test still fails, proceed to Step 5 for sensor replacement.
¶ Step 5. Extrusion force sensor replacement
Refer to Wiki Disassemble the H2D toolhead steps 1 to 13 to replace the left or right extrusion force sensor.
¶ Step 6. Homing test
Click the screen to re-initiate the homing process. If the HMS does not repeat, the troubleshooting is successful.
If the above solutions do not resolve the issue, submit a ticket and upload the printer’s log files.
¶ Equivalent Codes
The following HMS codes represent the same type of issue.
| HMS Code | Description |
|---|---|
| 0300-2500-0001-0003 | Unable to read data from the right extruder force sensor; there may be a communication break or sensor damage. |
| 0300-2600-0001-0003 | Unable to read data from the left extruder force sensor; there may be a communication break or sensor damage. |
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
If this guide does not solve your problem, please submit a technical ticket, will answer your questions and provide assistance.
If you have any suggestions or feedback on this Wiki, please leave a message in the comment area. Thank you for your support and attention!