¶ Fault Phenomenon:
After starting a print on the Mars 3, Mars 3 Pro, or Mars 4, the touchscreen restarts.
¶ Fault Causes:
- Adapter damaged or incorrect adapter specification.
- Damaged power PCB board
- Damaged constant current board
- 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 voltage is 24V and whether the output voltage is stable.
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b. The Mars 3 / Mars 3 Pro / Mars 4 use a 24V 3A adapter. If you have another Mars 3 / Mars 3 Pro / Mars 4, try using the other printer's adapter on the printer that is experiencing restarts. Then check whether the same issue occurs. If the issue no longer occurs with a different adapter, the original adapter may be damaged and needs to be replaced.
c. 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 circuit – 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 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. Peel off the touchscreen sticker from the upper right corner.
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d. Press the recess to remove the touchscreen.
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e. Use a 2.0mm hex screwdriver to remove the two screws at the marked positions.
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f. Unplug the two connectors on the right side of the power PCB board and remove the power PCB board.
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g. Unplug the connector on the left side.
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h. Use a wire (VH3.96 socket, 2P) to connect the two white connectors together. Then plug in the adapter and turn on the printer power.
Be careful not to mix up the wires: red to red, black to black. Incorrect wiring may damage the mainboard.
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After connecting the wire, check whether the touchscreen still restarts when running the exposure test or controlling the Z motor. If the touchscreen no longer restarts, the power PCB board needs to be replaced.
¶ 3. Eliminate accessory short circuit –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 six 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 socket, 2P) to connect the two white connectors directly together (refer to Step 3 for removal instructions). Then run the exposure test again. If the touchscreen still restarts, the power PCB board needs to be replaced.
¶ 4. Eliminate accessory short circuit – 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.
If the touchscreen restarts when moving the Z motor but does not restart when running the exposure test, proceed with further troubleshooting according to the instructions below.
b. Turn off the printer power and unplug the adapter. Then, unplug one of the components listed below at a time, 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 is shorted and needs to be replaced.
- Z motor
- Z limit switch
- Air purifier (the Mars 3 does not have an air purifier connector)
- Fan
Troubleshooting according to the above instructions does not affect the printer's warranty. If you are unsure about your findings, please contact our technical support team and provide us with the results of checks 1–4.
Technical support email address:
3dp@elegoo.com