¶ 1.Tools：
- S2.5 Allen key
- Phillips screwdriver
- Multimeter
¶ 2.Check the hotbed wiring:
¶ Step 1: Turn off the printer
Before checking the wiring, turn off the printer and disconnect the power supply to ensure safe operation.
¶ Step 2: Remove the printer base plate
Use an S2.5 Allen wrench to unscrew the two screws holding the base plate. Remove the cooling fan cable and remove the bottom plate.
¶ Step 3: Check the the heated bed cable.
(1) Gently tug on the heated bed cable to inspect whether it's loose or detached.
(2) If the cable is loose or detached, use a Phillips screwdriver to loosen the screws that secure the heated bed cable, then reattach and tighten the heated bed cable.
¶ 3.Measure the mainboard voltage:
¶ Step 1: Heat up the heated bed
First, heat the heated bed to 50 degrees. During the heating process, if the mainboard blue indicator light is on, it indicates that the heated bed is heating up normally. If it is flashing, it means the heated bed heating is complete. If it is not on, it indicates an abnormality in the heated bed heating, and voltage measurement is required.
¶ Step 2: Measure the mainboard voltage during heating
Note: This step requires some electrical knowledge and measurement equipment. Due to different brands of multimeters having different measurement ranges, adjust the multimeter to the appropriate range.
During the heating of the heated bed to 50 degrees Celsius, set the multimeter to the 200V DC voltage range. Place the red probe (positive) on the third port from the top downwards and the black probe (negative) on the fourth port from the top downwards. Measure whether the mainboard voltage during heating is 24±2V. If the measured voltage is within the normal range, it indicates that the mainboard is normal. Otherwise, if the measured voltage is not within the normal range, it indicates an abnormality in the mainboard, and the mainboard needs to be replaced.
