Замена платы AP H2D/H2C

Note: This page uses the H2D machine as an example. The replacement steps are exactly the same for H2C.

AP board

The full name of AP board is the Application Processor Main Board, which is the circuit board that processes information interaction in the printer. It provides an independent operating environment for the printer and supports all system functions required by printer applications, including memory management, system firmware, graphics processing, and multimedia decoding.

In this guide, we will show the process of removing the AP board and installing a new one.

The AP board spare parts include:

1. AP board * 1

2. BT3x5 screws - used to fix the AP board * 4

When to use

Обратитесь в техническую поддержку Bambu Lab, чтобы определить, связана ли проблема the printer has experienced is due to the AP board.

Tools and materials needed

1. New AP board

2. H2.0 Allen key

Some versions include the ground wire, while others do not, resulting in two versions coexisting. Please refer to the version you received to determine whether it is necessary to remove the ground wire from the AP board. The ground wire does not directly affect the function of the printer.

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. По любым вопросам или сомнениям, связанным с этим руководством, мы рекомендуем отправить запрос в техподдержку.

Important Note:
Once the new serial number (SN) is successfully registered, the old SN will be invalidated, and the old AP board can no longer be registered or bound.

For machines that have had the AP board replaced, as the new SN is not registered, binding cannot be performed. We recommend skipping the binding process during the initial startup to test if the replacement fixed the problem (unless you are troubleshooting network issues). After confirming the machine is working correctly, you can register the new serial number (SN) by войдя на официальный сайт Bambu Lab или обратившись в службу поддержки Bambu Lab для регистрации.

Remove the AP board

Step 1: Turn off the power

After turning off the printer, unplug the power cable and remove the glass cover plate.

Step 2: Remove the AP board cover

If you find it difficult to remove and install the AP board cover, you can refer to the relevant video steps in this wiki section to assist you. click here

Use an H2.0 Allen key to loosen 1 screw (BT2.6x8), and then remove the AP board cover from the side near the front door.

Step 3: Disconnect the cables

Unplug the connection cables on the AP board one by one.

If you have any questions about the connectors during disassembly or assembly, you can refer to this article Printer Cable Connector Installation and Removal Guide to learn how to handle this type of connector.

1. Screen FPC：

Gently pry open the latch on the screen FPC connector and pull out the cable.

2. Left and right LED light connectors（Blue：right LED light；Red：left LED light）：

Gently pry open the latch on the LED light cable connector and then pull out the connectors.

The left/right LED light connectors (red/blue) can be pulled out in the same way.

3. Wifi antenna：

Gently but firmly pull the Wifi antenna connector away from the AP board to remove it.

4. USB port board：

This connector should have some soft adhesive holding it in its socket on the board, usually on the top of the connector. Gently pry back and remove the adhesive to unseat the connector.

5. MC-AP cable（communication）：

Unlock the MC-AP cable by pulling the latch of the connector outwards.

6. MC-AP cable（power supply）：

Unlock the MC-AP cable by pulling the buckle of the connector outwards.

7. Live view camera connector：

Unfasten the latch that connects the live view camera connector to the AP board, and then remove the live view camera connector.

8. USB-C cable

Unplug the USB-C cable parallel to the AP board.

This cable may be difficult to remove while the AP board is still screwed to the frame. In that case, unplug it after step 4 below.

If your AP board has a ground wire at the bottom left mounting screw, you can separate the ground wire from the AP board when you remove the AP board mounting screw.

Step 4: Remove the AP board

Use an H2.0 Allen key to loosen the 4 screws (BT3×5), and then remove the AP board.

After removing the AP board, check whether the original MC-AP cable of the device is completely consistent with the MC-AP cable included with the new AP board. If the number of wires making up the cable is different, refer to Replace H2 Series MC-AP Cable for replacement (the two cables have exactly the same functions and effects).

image Fewer wire cores

image More wire cores

Install the AP board

Step 1: Reinstall the AP board

Align the AP board with the screw holes on the upper frame and tighten the 4 mounting screws (BT3x5) using an H2.0 Allen key.

If your AP board had a ground wire, you can replace the ground wire as it was before removal when installing the screw in the lower left screw of the AP board.

Step 2: Connect the cables

Reinstall the connection cables on the AP board one by one.

To avoid physical interference when connecting the cables, you can connect the cables in two parts:

1. For the left cables, connect them in this order: 1 -> 2 (blue -> red) -> 3 -> 4;

2. For the right cables, connect them in this order: 7 -> 8 -> 6 -> 5.

Note: When connecting the USB-C cable, make sure that the side marked with the A faces outward.

1. Screen FPC

2. Left and right LED connector (blue: right LED light; red: left LED light)

3. Wifi antenna

4. USB port cable

5. MC-AP cable (communication)

6. MC-AP cable (power supply)

7. Live view camera connector

8. USB-C cable

Step 3: Reinstall the AP board cover

Note: Before installing the AP board cover, it is necessary to check whether the cables are obstructing the PTFE tubes. Avoiding this interference will avoid issues when installing the PTFE tubes again in a later step.

image

First, snap the AP board cover back from the side near the back of the printer, press the two places indicated by the arrows into place, flush with the buffer on the right side and flush with the cable cover on the bottom. Then, tighten the mounting screw (BT2.6x8) using an H2.0 Allen key.

Verify the Functionality

Check the indicator lights on the control board

Normal State: The AP board indicator light flashes rapidly (left) and stays on (right).

You can look through the grill without removing the AP board cover and observe the indicator lights through the vent holes of the AP board cover at a specific angle.

If it is not clear, remove the plastic cover to see it better.

Connect the power cable and turn on the power. Initiate a print and check if there is an error.

If errors occur, check if all cables on the AP board are properly connected and try again. Если проблема сохраняется, обратитесь в техническую поддержку Bambu Lab для получения дальнейшей помощи.

Appendix

Specifications and quantities of screws required to replace the H2D AP board (it is recommended to keep the removed screws properly to avoid loss):

End Notes