¶ 1.Tools：
S2.5 Allen key*1
Multimeter*1
¶ 2. The wiring or wiring harness has poor contact
Troubleshooting methods：
¶ Step 1: Turn off the printer
Before troubleshooting, make sure the printer is turned off and disconnected from the power source to ensure safe operation.
¶ Step 2: Remove the motherboard cover
1. Use an S2.5 allen key to remove the motherboard bottom cover screws.