the dish machine didnt do it
wet board didnt either
please refer to the TG16 repair manual for the pin functions
use a logic probe at the 6280 and look for the pulses from the controller
I don't have a logic probe but I suppose I should grab one. There are times in the future where I am sure it will be handy.
Besides testing continuity in the original circuits to HuC6280 (all were fine) and testing continuity through the jumpers I installed (also fine), I did check voltage on the circuit. I looked up the HuC6280 pin out and checked each controller input. At idle I measured 5VDC on each pin (This was using ground at multiple places on the board). When a button is pressed it goes to 0VDC because the button press is basically sending input power to ground (I think this is how it works. This is how NES controllers work). I'm still trying to grasp "high" and "low" inputs but I surmise that one press sends all power to ground and the opposite function (on the same input line to HuC6280) only sends some power to ground. I assume this is the difference in high and low but I really don't know I'm just guessing. You electrical engineers and software folks would know the answer here. Anyways, pin 3 of the controller port handles input functions of D-pad right and button II. This circuit goes to pin 24 of HuC6280. When I measure power directly from pin 24 of HuC6280 to any ground on the PCB this is the result:
Constant 5VDC when no button is pressed
0VDC when button II is pressed
4.8VDC when D-pad right is pressed
Is this the same thing a logic probe is testing for just on a more accurate scale to pickup pulses and whatnot?
