Specific points on the PCB (Cross, Circle, Triangle, and Square) where signals are sent to the processor when a circuit is completed by the conductive membrane.
Often caused by worn potentiometers or damaged traces. Continuity tests between the stick's 3 pins and the processor can identify broken paths. jdm-040 schematic
Technicians often use the schematic to trace faults in specific systems: Specific points on the PCB (Cross, Circle, Triangle,