¶ E308 - Build-plate T Sensor wire is broken
¶ The error will occur when the cable of this sensor is broken and touching somewhere causing short of circuit, or the sensor is damaged or else.
¶ Steps:
(1) Use the knob wrench to remove the back cover of printer, locate the plug-J45 in the lower left corner of main board, and unplug it ( Figure -1 ). Then locate the wiring terminal of build-plate heater in Z axis, use the meter to measure the resistance of temp sensor of build-plate ( 2 wiring ports with sign of “T” ). Normally, the resistance value should be around 100KΩ@ 25°C ( the value in Figure - 3 is 90kΩ because of the indoor temp, it's a normal value ). If the resistance value had a very big difference, please replace the build-plate heater. (Step of replacement)
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(2) If the resistance value measured via the 2 ports in wiring terminal is normal, then measure the resistance value via the 2 pins of J45. Normally, the value should be around 100KΩ@ 25°C ( Figure - 3, because of the variation of indoor temp, the value in Figure - 3 is 75.3kΩ, it's a normal value, it's just an example here). If the resistance value had a very big difference, please replace the cable inside the umbilical track (cable from main board to wiring termial).
(3) If nothing abnormal after above 2 steps, please replace the main board. (step of replacement)