Long Beach, CA
I'm troubleshooting my Stern MPU (LED locked on) per clay's guide. Per the following section:
"This will tell you if power is getting through the board to the chips
U6, U2 (ROM): +5 = pin 24, GND = pin 12
U9 (CPU): +5 = pin 8, GND = pin 1 or 21
U10,U11 (PIA): +5 = pin 20, GND = pin 1
U8 (5101): +5 = pin 22, GND = pin 8
U7 (6810): +5 = pin 24, GND = pin 1"
With power ON I should get GND at Pin12 for U6 and Pin 21 for U9 but am not. I am getting at GND at Pin 12 for U2.
With power OFF I do get GND (rings out to TP4) for all three. Any thoughts?
