¶ Fault Phenomenon:
- The nozzle temperature displays a negative value.
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- The nozzle reports an error indicating the temperature is too low or too high.
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¶ Fault Causes:
- Poor contact or damage to the ribbon cable or adapter board.
- Damaged thermistor.
- Damaged mainboard.
¶ Tools Required for Troubleshooting:
- 2.0 mm hex screwdriver
- Multimeter
¶ Troubleshooting Steps:
¶ 1. Check whether the reserved length of the ribbon cable is appropriate
a. Turn off the printer power switch and unplug the power cord.
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b. Manually pull the Z timing belt to move the extruder to the Z max and X max positions.
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c. Check whether the reserved length of the extruder ribbon cable is sufficient.
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Note: X Max and Z Max refer to the maximum travel limits of the X-axis (to the right) and Z-axis (upward).
- If the extruder cannot currently be moved to X Max or Z Max, loosen the screws below to adjust the ribbon cable length.
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¶ 2. Check the extruder ribbon cable connector
a. Turn off the printer power switch and unplug the power cord.
b. Check whether the extruder ribbon cable is properly installed in the bracket, whether the pins on the extruder adapter board are deformed, and re-plug the extruder ribbon cable connector.
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¶ 3. Check for poor contact in the extruder ribbon cable
a. Plug in the power cord and turn on the power switch.
b. Move the extruder left and right along the X-axis, and check whether the nozzle temperature value on the touchscreen changes.
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- If the nozzle temperature value on the touchscreen changes while moving the extruder left and right, there is poor contact in the extruder ribbon cable. The ribbon cable needs to be replaced.
¶ 4. Check the thermistor connector
a. Turn off the printer power switch and unplug the power cord.
b. Remove the ribbon cable.
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c. Remove the screws securing the extruder and take off the extruder.
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d. Check whether the thermistor wires are damaged. If you have a multimeter, measure the thermistor resistance. It should be approximately 100kΩ.
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¶ 5. Swap the nozzle and heatbed thermistor connectors for testing
a. Turn off the printer power switch and unplug the power cord.
b. Remove the screws securing the bottom cover, unplug the mainboard fan connector, and remove the bottom cover.
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c. Unplug both the nozzle and heatbed thermistors at the same time. Swap the positions of the hotend (nozzle) and heatbed thermistor connectors.
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d. Plug in the power cord and turn on the printer.
e. Check the nozzle temperature value on the touchscreen.
- If the nozzle temperature still displays a negative value, the mainboard is damaged and needs to be replaced.
- If the nozzle temperature displays room temperature, one of the extruder ribbon cable, adapter board, or thermistor is faulty. It is recommended to replace all three components together.