Руководство по замене платы TH для H2C

Important Reminder

The H2C TH board uses a small connector design for the fan and eddy current sensor connectors. To remove the connector, hold its base and lift it perpendicular to the PCB surface. Do not apply horizontal force, as this may damage the connector.

Extrusion Interface Board / TH Board / FPC Cable

This guide includes instructions for replacing the extrusion interface board, TH board, and FPC cable (all within the same Wiki), allowing you to replace the relevant parts as needed. For example, if you only need to replace the FPC cable, you can skip the subsequent steps for replacing the TH board.

The TH board and extrusion interface board are mounted on the back of the toolhead and connected via an FPC cable. Details of the TH board, extrusion interface board, and their accessories are as follows:

The accessories for the extrusion interface plate are as follows:

• Extruded interface board * 1
• FPC cable * 1
• TH board * 1
• BT2.6x8 screws - for securing TH board * 4
• M1.6x4 screws - for securing the extrusion interface plate * 2

Required Tools and Materials

New TH board/FPC cable/extruded interface board (please select the corresponding replacement parts according to your actual needs).

• H2.0 hex wrench
• H1.5 hex wrench

Removing the Extrusion Interface Board/TH Board/FPC Cable

Step 1: Remove the Part Cooling Fan Duct and Fan Components

You can refer to the H2C Part Cooling Fan Replacement Guide or the video below (first 1 minute 40 seconds) to remove the part cooling fan duct and part cooling fan.

Step 2: Remove the Extrusion Interface Board

Disconnect the 2004 switching motor FPC plug (#1), the TH board interface FPC plug (#2), and the 2004 lifting motor FPC plug (#3) from the interface board in sequence.

Note: The plugs are secured with clips. Unlock the clips before unplugging the FPC cable.

• Position 1:

• Position 2:

• Position 3:

After unplugging these connectors one by one, use a 1.5 mm hex wrench to remove the two screws and release the heating element power cable.

Remove the two extrusion interface board fixing screws (M1.6 × 4).

Gently shake the extrusion interface plate near the 2004 motor plug switch, then carefully remove the extrusion interface board.

Step 3: Remove the Buffer and AP Board Cover

Since the MC-TH line is located behind the buffer and the AP board cover, they need to be removed first.

1. Remove AP panel cover:

Use an H2.0 hex wrench to unscrew one retaining screw (BT2.6x8);

Then remove the AP panel cover from the side nearest the front door.

2. Remove the buffer

You can refer to steps 2, 3, 4, and 5 of this Wiki to remove the buffer: H2C Filament Buffer Replacement Guide.

Step 4: Disconnect the Connection Wires on the TH Board

Disconnect the plugs on the TH board one by one. The specific cable connectors and their connections are shown below:

There are three types of plugs on the TH board, and you can use different methods to disconnect them depending on the type of plug.

ℹ️Note: How to correctly remove the connectors

• The plugs 1, 2 ,4 ,5 ,6 ,8 and 11 are all secured with clips. You need to first open the clips on the connector and then remove the cable.
  (The animation below is for the H2D, but the connector is the same)
  
  image
• In 3, 7, and 9, Pull the connector diagonally down and away from the board. Be carefull, excessive force on the cable might lead to damage to the connector.
  (The animation below is for the H2D, but the connector is the same)
  
  image
• In 10, it is fixed by a power strip, so you can pull it out directly.

Step 5: Remove the TH Board

Use an H2.0 hex wrench to remove the two retaining screws (BT2.6x8).

Disconnect the cable chain from the cable chain base.

Remove the MC-TH and USB-C data cables from the cable chain.

Rotate the cable chain base until its notch aligns with the notch on the toolhead’s inner frame.
 

Drag the TH board down slightly to remove the MC-TH and USB-C data cables together from the notch.

Finally, disconnect the USB-C cable from the TH board.

Unlatch the two clips on the cable chain, located on sections 8 and 18 respectively (counting from the toolhead side).

Disconnect the cable chain from the printer cover, then remove the MC-TH cable from the cable chain.

Then press the latch on the MC-TH cable to disconnect it from the MC-TH adapter cable, pull the cable out of the cable chain, and remove the TH board.

Pull the USB-C and MC-TH cable assembly out of the cable chain. After this step, you will have the USB-C cable, TH motherboard, and cable chain separated.

Installing the Extrusion Interface Board/TH Board/FPC Cable

Step 1: Install the TH Board

1. Connect the new TH board to the MC-TH adapter cable, and hook the cable into the cable chain. Then, connect the cable chain to the top cover.

2. Next, connect the USB-C data cable to the TH board.

Note: The T should face outwards!

3. Next, rotate the cable chain base to align its notch with the notch on the toolhead frame. Then insert the MC-TH cable and the USB-C data cable into the cable chain base and the toolhead frame. Insert the thinner cable (USB-C) first, followed by the thicker cable (MC-TH).

4. Reconnect the cable chain to the cable chain base, and fasten the clips. Then, install them on sections 8 and 18, respectively, counting from the toolhead side.

5. Align the TH board with the screw holes on the toolhead, and tighten the two fixing screws (BT2.6×8) using an H2.0 hex wrench.

Note: Make sure no cables are trapped under the TH board before tightening the screws.

6. From top to bottom and left to right, check the following cables in order: 2004 switching motor, 3513 extrusion motor, hotend fan, extrusion interface board plug, extruder Hall adapter board cable, toolhead camera, nozzle camera, left and right eddy current sensors, lifting Hall effect sensor, 2004 lifting motor cable, and the left and right hotend heating assembly.

Step 2: Connect the Cables

Connect the cables back to the TH board in sequence. There are three types of plugs on the TH board, and each requires a different connection method depending on its type.

in:

• The plugs numbered 1, 2, 4, 5, 6, 8, 9, and 11 are secured with clips. Insert the ribbon cable into the corresponding interface on the TH board, make sure it is fully inserted, and then lock the clips

Clip the cable into the cable management clip:

As shown by the arrows, there are two cable management slots. The larger slot (indicated by the lower arrow) is used to hold the cables for the left hotend heating component, while the smaller slot (indicated by the upper arrow) is used to organize the cables for the left eddy current sensor connector, right eddy current sensor connector, and the Hall effect sensor connector. Reconnect these three connectors to the TH board, then insert the cables back into the smaller cable management slot.

The order for inserting the cables is as follows:

Step 3: Install the Filament Buffer and AP Board Cover

1. Install the filament buffer:

You can refer to this Wiki to install the buffer: Replacing the H2C Buffer Guide.

2. Install AP board cover:

First, snap the AP board cover back into place, starting from the side closest to the rear of the printer. Then press the two points indicated by the arrows until they click into place, ensuring the right side is flush with the buffer and the bottom edge is aligned with the cable guard cover.

Then, use an H2.0 hex wrench to tighten one of the retaining screws (BT2.6×8).

Step 4: Install the Extrusion Interface plate

1. Align the pins on the extrusion interface board with the slots on the TH board, and install the extrusion interface board onto the TH board.

2. Tighten the two retaining screws (M1.6×4) using an H1.5 hex wrench.

3. Reconnect the cables to the extrusion interface board in sequence.

Step 5: Install Part Cooling Fan and Air Duct

You can refer to the installation steps in this Wiki: Replacing the H2C Part Cooling Fan Guide to install it.

Verifying Functionality

Check Whether the TH Board is Connected Correctly by Observing the LED Indicators on the Circuit Board

Normal state: The TH board indicator light should stay on steadily for the upper and middle LEDs, and flash rapidly for the lower one.

Before tightening all the screws, you can loosely fit the cover or leave it off. Make sure the power is off while doing this to avoid electrical hazards. Then power the machine back on and check that the board’s indicator lights are working correctly. If everything looks normal, go ahead and tighten the screws. This will help you avoid extra rework later.

Connect the Power Cord and Turn on the Printer. Start a Print and Check for Any Errors.

If the print does not complete successfully, review your steps and verify all cable connections before trying again. If the issue persists, обратитесь в техническую поддержку Bambu Lab

Screw List

Below are the screw types and quantities required for replacing the H2C extrusion interface board, TH board, and FPC cable.
(Keep the removed screws in a safe place to prevent loss.)