marlin/Marlin/pins_MKS_BASE.h

/**
 * MKS BASE 1.0 – Arduino Mega2560 with RAMPS v1.4 pin assignments
 */

#include "pins_RAMPS_13.h"

#undef FAN_PIN
#define FAN_PIN             9 // (Sprinter config)

#undef HEATER_1_PIN
#define HEATER_1_PIN        7