¶ Issue Description
The extruder servo motor is located at the center of the toolhead and is used to drive the extruder gear. After the printer is powered on, the extruder servo motor performs a self-test. If a motor open circuit is detected, the issue must be resolved before printing can commence.
Possible causes include:
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Short circuit in the motor
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Abnormal TH board driver
¶ Troubleshooting
Before disassembling the toolhead, ensure the printer is powered off.
¶ Tools, Equipment, and Materials
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H2.0 Allen key
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H1.5 Allen key
¶ Fault Isolation Process
¶ Solutions
Users may adjust the order of these solutions as needed.
¶ Step 1. Disassemble the toolhead to expose the TH connection board and unplug the extruder servo motor FPC.
- Refer to steps 1~4 in the Wiki: https://wiki.bambulab.com/en/h2/maintenance/disassemble-and-install-h2d-toolhead to expose the TH connection board.
1-Extruder switching motor FPC 2-extruder servo motor FPC
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Unplug the extruder switching motor FPC.
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Unplug the extruder servo motor FPC and reconnect the extruder switching motor FPC.
¶ Step 2. Check if other functionalities related to the toolhead are working properly
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Power on the printer.
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Check if the screen still displays the same error message: "The extruder servo motor has a short-circuit. It may have failed."
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If yes, the TH board is faulty. Proceed to Step 3 to replace the TH board.
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If the error message is not displayed, power off the printer, reinstall the extruder servo motor FPC, and proceed to Step 4 for testing.
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¶ Step 3. Replace the TH board
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Refer to Steps 1~8 in the Wiki How to Disassemble and Assemble H2D Toolhead to replace the TH board.
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Partially reassemble the toolhead (part cooling fan, duct, and hotend do not need to be installed).
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Proceed to Step 4.
¶ Step 4. Power-on test
Power on the printer and perform a self-test. If no related alerts pop up, the troubleshooting was successful.
If the extruder servo motor short-circuit alert persists, proceed to Step 5 to replace the extruder servo motor.
¶ Step 5. Replace the extruder servo motor
Refer to Steps 1~10 in the Wiki How to Disassemble and Assemble H2D Toolhead to replace the extruder servo motor.
¶ Step 6. Reassemble the toolhead and test
Power on the printer again and perform a test. If no alerts are displayed, the troubleshooting is complete.
¶ 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.
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