¶ MC board
The spare parts for the MC board include the following:
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MC board * 1
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ScrewsBT2x5 *6 - for securing the MC board *6
¶ When to replace
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Under normal power supply conditions, the MC board's indicator light does not flash;
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The connector is damaged, showing obvious component failure;
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The Bambu Lab customer support confirmed through the log files that it is an issue related to the MC board.
¶ Tools and materials needed
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New MC board
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H2.0 Allen key
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H1.5 Allen key
¶ Safety Warning
IMPORTANT!
It's crucial to power off the printer before conducting any maintenance work, including work on the printer's electronics and tool head wires. Performing tasks with the printer on can result in a short circuit, leading to electronic damage and safety hazards.
During maintenance or troubleshooting, you may need to disassemble parts, including the hotend. This exposes wires and electrical components that could short circuit if they contact each other, other metal, or electronic components while the printer is still on. This can result in damage to the printer's electronics and additional issues.
Therefore, it's crucial to turn off the printer and disconnect it from the power source before conducting any maintenance. This prevents short circuits or damage to the printer's electronics, ensuring safe and effective maintenance. For any concerns or questions about following this guide, open a new ticket in our Support Page and we will do our best to respond promptly and provide the assistance you need.
¶ Remove the MC board
¶ Step 1: Remove the rear panel
Refer to this wiki to remove the printer's rear panel.
¶ Step 2: Remove the purge chute
Refer to this wiki to remove the purge chute.
¶ Step 3: Remove the MC board
- Remove the bundle of cables from the cable clip to provide space for the subsequent plug removal.
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- Disconnect all connectors on the front of the MC board. Please note that some plugs use a locking mechanism, and you must unlock the latch before pulling them out. For specific plugs that require unlocking, refer to the component correspondence table in the installation steps.
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Additionally, to prevent the plugs from loosening during transportation, the three stepper motor plugs beneath the heatsink are reinforced with electronic silicone. To remove these three plugs, you first need to use a sharp tool, such as tweezers, to make a cut in the silicone around the plug before pulling it out.
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Use an H1.5 Allen key to remove the 6 fixing screws and take the MC board out of the lining. Please note that there is also a power input plug for the MC board on the back; do not pull it forcefully.
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Disconnect the power plug from the back of the MC board.
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¶ Install the MC board
¶ Step 1: Install the MC Board
- Insert the power plug into the back of the MC board.
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- Align the new MC board with the small holes in the lining, then use an H1.5 Allen key to tighten the five screws.
Please ensure that before tightening the screws, you check that there are no plugs being pressed against the MC board from above, below, or on the sides to avoid the need for rework.
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- Refer to the diagram below to sequentially reconnect the cables to the MC board and organize the cables.
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| No. | Component or function description | Remark | No. | Component or function description | Remark | No. | Component or function description | Remark |
|---|---|---|---|---|---|---|---|---|
| 1 | 4-pin interface inside the chamber | 13 | Chamber exhaust fan | 25 | Filter switch flap servo | |||
| 2 | TH board communication | 14 | Idle | Not used yet | 26 | Active chamber exhaust servo | ||
| 3 | TH power | 15 | Top glass or top laser protection plate hall effect sensor | 27 | Chamber heater unit NTC | |||
| 4 | AP power | 16 | Front door hall effect sensor | 28 | Chamber heat circulation fan | |||
| 5 | 4-pin interface on the back of the printer | 17 | Left side panel hall effect sensor | 29 | Emergency stop button & Nozzle presence detection hall | |||
| 6 | Filament buffer | 18 | MC board cooling fan | 30 | Built-in air pump interface | For non-laser version (without built-in air pump), empty | ||
| 7 | MC power input source | On the back of the MC board | 19 | Right side panel hall effect sensor | 31 | Idle | Not used yet | |
| 8 | Idle | Not used yet | 20 | Automatic top vent motor | 32 | Idle | Not used yet | |
| 9 | Chamber NTC | 21 | Start/Stop button | A | A motor interface | Left motor (Looking forward from the rear panel) | ||
| 10 | AP communication | 22 | Flame sensor | B | B motor interface | Right motor (Looking forward from the rear panel) | ||
| 11 | Auxiliary part cooling fan | 23 | Nozzle offset calibration sensor | Z | Z motor interface | |||
| 12 | AC board | 24 | Heatbed NTC&RGB |
- Recheck the above table again to see if there are any missing plugs. If there are any omissions, please make sure to insert them back.
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The non-laser version (without a built-in air pump) H2D has 5 available sockets, while the laser version (with a built-in air pump) has 4 available sockets.
Non-laser version H2D as an example：
The Z motor is mounted on the base, while the A and B motors are located on the XY plane. If you are unsure about the plugs for the A, B, and Z motors, you can gently pull on the cables to see which motor's cable moves. For example, if you pull a certain plug and the cable connected to the A motor moves, it indicates that this motor is the A motor. The identification method for the B and Z motors is similar.
Friendly Reminder: This is just a recommended wiring method, as it provides a more aesthetically pleasing appearance. If you prefer not to wire it this way after replacing the MC board, just ensure that the plug connections are stable, and functionality will not be affected.
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¶ Step 2: Install the Purge Chute
Refer to the relevant information about the purge chute to complete the installation.
¶ Step 3: Install the Rear Panel
Refer to this wiki to install the printer's rear panel.
¶ Step 4: High-temperature Bed Leveling
After replacing the MC board, to prevent any abnormal printer operation, it is necessary to perform a high-temperature bed leveling. Please tap on the screen "Settings" > "Calibration" > "Print Calibration", check "High-temperature Bed Leveling", and start the calibration process.
¶ To verify completion/success
Connect the printer power, turn on the printer, and operate from the screen to run the device self-test process. If the self-test passes, it indicates that the operation was successful.
If not, please check all connections again and try again. If the issue persists, contact the Bambu Lab customer support for further assistance.
¶ End Notes
We hope the detailed guide provided has been helpful and informative. To ensure a safe and effective execution, if you have any concerns or questions about the process described in this article, we recommend submitting a Technical ticket regarding your issue. Please include a picture or video illustrating the problem, as well as any additional information related to your inquiry.