Phenomenon:

1. The printer is ON and idle, but the tool head fails to move along X and Y axes when pressing the directional buttons (Rx exception);

2. There is no temperature information on the screen, both the hot end and the heat bed temperature are displayed as “0” (Tx exception);

3. Both the tool head movement and the temperature are abnormal (Rx & Tx exception).

Causes & Solutions:

1. Components on the AP board may be damaged and need to be replaced.

2. The MC board may be faulty and need to be replaced.

3. There may be poor connection on the MC-AP cable, which requires reconnecting or replacing the MC-AP cable.

Safety warning and Machine state before starting operation

When disassembling the connection cable on the printer, the printer should not be connected to power.

Tools needed

  • H2.0 hex key
  • Multimeter
  • Tweezers

Operation guides

Step 1 – Confirm the fault phenomenon

When the printer is turned on and idle, check the temperature information on the screen and the control of the toolhead movement to see whether the printer is RX abnormal, TX abnormal, or both RX and TX are abnormal, and then proceed to the next step.

Step 2 – Check the status of the MC board

If the situation confirmed in step 1 is that both RX and TX are abnormal, you can keep the power on and observe the status indicator LED of the MC board through the excess chute (in case of uncertainty, you can remove the rear panel first, and directly observe the indicator LED status). If the indicator LED of the MC board flashes normally, you can proceed to the next step; If the MC board indicator does not work, it is recommended to replace the MC board.

(Click  MC board to learn how to replace MC board)

Step 3 – Pre-inspection of poor contact of AP-MC cable

If Tx is abnormal (no temperature), you can continue to remove the fixed tape of the AP-MC cable under the power-on state, and then shake the entire cable to observe whether the temperature on the screen changes. If there is no change, proceed to the next step; If there is any change, it indicates a poor connection, and you can go to step 5.

Step 4 – Check the AP board

Remove the foam covering from the AP board, disconnect the camera connection cable, check the status of the components under the card slot, and confirm that there is nothing missing or burnt. If there are any, replace the AP board. If there are no abnormalities, proceed to the next step.

(Click AP board to learn how to replace the AP board)

Step 5 – Check the connectors

Refer to the relevant steps of the MC-AP cable, find the connectors of the cable on the AP board and MC board, confirm that the connection status is normal, unplug the plug, and check and confirm that the plugs and seats are normal and without damage. Then proceed to the next step.

Step 6 – MC-AP cable connection continuity test

Use a multimeter to measure whether the second and third contact of the AP plugs (red points and yellow points below, respectively) are conductive.  If you can detect conductivity across the red points and across the yellow points, proceed to the next step.  If there is a break in conductivity across either set of points (red or yellow), replace the cable.

Step 7 – Check the MC board

If no abnormality is found in the above steps, and the indicator of the MC board has been confirmed to work normally in step 1, you can try to observe whether there are any damaged components visible on the MC board. If you find any, replace the MC board.  If you cannot find any damage, please provide the LOG file to the service team for analysis and confirmation.  You could also check the MC-TH cable (this should be another troubleshooting guide).

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