This information is using for troubleshooting by experienced users. 


Connections circled red are all used on CR-10S Pro V2 with BL Touch.

CR-10S Pro V1 (NON BL TOUCH) use the Z- (circled in blue)

Top left is hotend heater (just labeled 24V)
X is X stepper motor
E1 is Extruder stepper motor

X- is X limit switch
X+ is filament sensor
FAN is hotend fan
K-FAN is part cooler fan
TH1 is hotend thermistor

Z- is only used on capacitive probe machines