¶ Fault Phenomena:
- Random restart during printing
- The motor stops rotating during printing
¶ Fault Causes:
- Using an incorrect specification adapter / Adapter is damaged
- Power PCB board is damaged
- Constant current board is damaged
- Short circuit in one of the following components: Z motor / Z limit switch / Air purifier / Fan
¶ Tools Required for Troubleshooting:
- Multimeter
- 24V adapter
- 2P wire with VH3.96 connectors on both ends
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¶ Troubleshooting Steps:
¶ 1. Check whether the adapter is damaged and whether its specifications meet requirements.
a. If you have a multimeter, check whether the adapter's output power is 24V and whether the output voltage is stable.
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b. The Mars 4 Ultra uses a 24V 3A adapter. If you have another printer (e.g., Mars 3, Mars 3 Pro, Mars 4), try using that printer's adapter on the printer experiencing random restarts. Then check whether the same issue still occurs. If the issue no longer occurs with a different adapter, the original adapter may be damaged and needs replacement.
If you do not have an adapter with the same specifications, you may also try using a 24V 6A or 24V 10A adapter for testing.
¶ 2. Eliminate accessory short circuits – Check whether the power PCB board is shorted.
a. Use the touchscreen to run the exposure test and to control the Z motor movement.
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If both the exposure test and moving the Z motor cause the touchscreen to restart, proceed with further troubleshooting according to the instructions below.
b. Turn off the printer power and unplug the adapter.
c. Refer to the video below from 00:00 to 03:03 to open the printer casing:
https://www.youtube.com/watch?v=EWZmiQjavSE
d. Unplug the two connectors at the marked positions.
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e. Use a 2P wire with VH3.96 connectors on both ends to connect these two terminals directly.
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f. After connecting the wire, reinstall the other printer components to their original positions. Check whether the touchscreen still restarts when running the exposure test or controlling the Z motor movement.
- If the touchscreen no longer restarts, the power PCB board needs to be replaced.
- If the touchscreen still restarts, proceed to Step 3 for further troubleshooting.
¶ 3. Eliminate accessory short circuits – Check whether the constant current board is shorted.
a. Use the touchscreen to run the exposure test and to control the Z motor movement.
If the touchscreen restarts during the exposure test but does NOT restart when moving the Z motor, proceed with further troubleshooting according to the instructions below.
b. Turn off the printer power and unplug the adapter.
c. Use a 2.0mm hex screwdriver to remove the eight screws securing the rear panel, then remove the rear panel.
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d. Unplug the constant current board connector.
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e. Plug the adapter into the printer and turn on the printer power. Run the exposure test via the touchscreen and check whether the touchscreen restarts. If the touchscreen does NOT restart, the constant current board needs to be replaced.
f. If the touchscreen still restarts, temporarily leave the constant current board connector unplugged. Remove the power PCB board and use a wire (VH3.96 connector, 2P) to connect the two white connectors directly together. Then run the exposure test again. If the touchscreen still restarts, the power PCB board needs to be replaced.
¶ 4. Eliminate accessory short circuits – Check whether the Z motor / Z limit switch / Air purifier / Fan is shorted
a. Use the touchscreen to run the exposure test and to control the Z motor movement.
b. If the touchscreen restarts when controlling the Z motor movement via the touchscreen, but does NOT restart when running the exposure test, proceed with further troubleshooting according to the instructions below.
c.Turn off the printer power and unplug the adapter. Then, unplug one of the components listed below at a time. After unplugging each component, plug in the adapter, turn on the power switch, and run the exposure test via the touchscreen. If the touchscreen no longer restarts after unplugging a specific component, that component has a short circuit and needs to be replaced.
- Z motor
- Z limit switch
- Air purifier
- Fan
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Troubleshooting according to the above instructions does not affect the printer's warranty. If you are unsure about your inspection results, please contact our technical support team and provide the inspection results from steps 1–4.
Technical support email address: 3dp@elegoo.com