¶ 1. Phenomenon Description
Error, key: 3002 appears on the screen
¶ 2.1 The firmware version of the upper host computer does not match with the firmware version of the lower host computer.
¶ 2.2 The hot end wire terminal connection (mainboard terminal number: J51) is loose.
¶ 2.3 The hotbed adapter wire terminal connection (mainboard terminal number: J11) is loose.
¶ 2.4 The mainboard is abnormal.
¶ 3.1 Upgrade Firmware
¶ 3.2 Re-insert the hot end wire terminals (main board terminal number: J51)
¶ 3.3 Re-insert the hotbed adapter wire terminal (main board terminal number: J11)
¶ 3.4 Re-insert the mainboard