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#920 Back Cover Opened

FLUX Support Team
  • Updated

Description

#920 indicates an error that the back cover is opened during a task, so the task is forced to stop.
The laser tube is in the chamber at the back of the machine, and the back cover must be closed for safety reasons. A weak magnet, faulty back sensor, etc can cause the issue. Please follow the instructions below to find the root cause.

 

Possible Causes

  1. The system fails (Re-update the firmware, reset to factory, or reflash RK board.)
  2. The magnet is missing.
  3. The mainboard/MB/motherboard is malfunctioning and fails to capture the signal.
  4. The back cover sensor or the cable/wire is malfunctioning.
  5. The rear work LED light is malfunctioning. (Less likely)

 

Step 1

  • Ensure the back cover is fully pushed down, and the screw is screwed firmly.

Determine your result and the next action to take:

  • Yes, the back cover is firmly closed and screwed >> Step 2

 

Step 2

Check whether the back cover icon in Control mode is opened or closed.

 

Determine your result and the next action to take:

  • The icon shows closed >> Problem Solved
  • The icon shows opened >> Step 3

 

Step 3

For safety purposes, please set the power rate to 0% to ensure no pulses during your testing.


 

Determine your result and the next action to take:

  • The power rate has been set to 0% >> Step 4

 

Step 4

There is one magnet on the back cover. Please open the back cover and check it.

 

Determine your result and the next action to take:
  • The magnet is loose and fell off >> Use super glue to fix them on the door >> If the problem continues, go to Step 5
  • The magnets are firmly fixed on the door >> Step 5

 

Step 5

This step will guide you through testing whether the back cover sensor works normally using two external magnets.

  • Open the back cover to find the sensor.

 

  • The back cover sensor will have two LED lights in red, and they will always be ON.


  • Place two external magnets close to both LED lights. The light should be "brighter" when it detects a magnet. When both LEDs detect magnets simultaneously, a door-closed signal will be delivered to the system, and the icon on the panel will be changed.
  • Go to "Control", wait til the homing finishes, and check the icon.

Determine your result and the next action to take:

  • The red LEDs one or both are "completely" off >> Go to Step 6
  • Red LEDs one or both doesn't become brighter >> Go to Step 6
  • Red LEDs both become brighter and the icon shows "Open" > Go to Step 6
  • Red LEDs both become brighter and the icon shows "Close" > Go to Step 8

 

Step 6

Remove the cable of the sensor and check the icon.
When the sensor is disconnected from the system(mainboard), the icon should always stay "Open".

  • Turn off the machine and unplug the cable.

 

  • Turn on the machine and go to "Control", wait til the homing finishes, and check the icon.

Determine your result and the next action to take:

  • When the cable is unplugged, the icon shows "Open" >> Go to Step 6.1
  • When the cable is unplugged, the icon shows "Closed" >> Record a video showing the issue >> Report to the local reseller or FLUX Support.
    • Possible cause:
      1. Mainboard is having a problem
      2. The rear work LED light is having a problem

 

Step 6.1

Replug the cable and re-test with the magnets again.

  • Turn off the machine, replug the cable, and turn on the machine.

 

  • Put two of the magnets on the sensor's LED lights.
    The light should be "brighter" when it detects a magnet.
  • Go to "Control", wait til the homing finishes, and check the icon.

Determine your result and the next action to take: 

  • The red LEDs one or both are "completely" off >> Record a video >> Report to the local reseller or FLUX Support
  • Possible cause:
    1. The back cover sensor is having a problem
    2. The rear work LED light is having a problem
  • Red LEDs both become brighter and the icon shows "Open" >> Go to Step 7
  • Red LEDs both become brighter and the icon shows "Close" >> Go to Step 8

 

Step 7

Reset the machine to the factory and re-test it with the magnets.

  • Reset the machine to the factory.
    (Main Page > Machine > Next page > Reset to Factory > Yes)


  • Put two of the magnets on the sensor's LED lights.
    The light should be "brighter" when it detects a magnet.
  • Go to "Control", wait til the homing finishes, and check the icon.

Determine your result and the next action to take:

  • Red LEDs both become brighter, and the icon shows "Open" >> Record a video >> Go to Report to the local reseller or FLUX Support.
    • Possible cause:
      1. The back cover sensor is having a problem
      2. The mainboard is having a problem
      3. The rear work LED light is having a problem (Less likely)
  • Red LEDs both become brighter, and the icon shows "Close" >> Go to Step 8

 

Step 8 

Check the position of the sensor; the sensor may be mispositioned or have fallen off, which may cause the detection of magnets to fail.
Please check if the screws are firmly screwed and the sensor is positioned straight.

 

Determine your result and the next action to take:

  • The sensor is NOT in the correct position >> Go to Step 8.1
  • The sensor is in the correct position >> Go to Step 9

 

Step 8.1

Reposition the sensor by screwing the two screws and nuts firmly.

  • After checking or re-screwing, Go to Step 9

 

Step 9

Remove the magnets and close the back cover to check the icon's status.

  • Remove the magnets from the sensor.

 

  • Close the back cover and screw it.


  • The door icon should be closed when the cover closes and open when the cover opens.

Determine your result and the next action to take:

  • The icon shows "closed", and #920 DOES NOT pop up during tasks >> Problem solved.
  • The icon shows "closed", but #901 POPS UP during tasks randomly >> Go to Step 10
  • The icon shows "Open" >> Record a video >> Contact customer service
    • Possible cause:
      1. The magnet is weak
      2. The back cover sensor is having a problem
      3. The mainboard is having a problem (Less likely)
      4. The rear work LED light is having a problem (Less likely)

 

Step 10 

Reset to the factory and update the firmware. Sometimes, random errors might pop up if the operating system is corrupted.

  • Reset the machine to the factory.
    (Main Page > Machine > Next page > Reset to Factory > Yes)

 

 

  • After the update, please run a random task and see if #920 reappears.
    Screenshot 2024-05-31 at 3.16.46 PM.png


Determine your result and the next action to take:

  • #920 DOES NOT pop up during tasks >> Problem solved.

 

Report to the local reseller or FLUX Support

  • Please follow the instructions in the link below to properly report an issue to your local reseller or FLUX support. [Contact Customer Service]

*The collected information such as photos or videos that show the problem of your machine in this article will be necessary to be shared with the reseller or FLUX Support.

 

#END

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