Rolling Stones
Bally, 1980You're currently viewing posts by Pinsider quench.
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Quoted from JethroP:Checking U6 with my probe, the green "level" LED is solid on pins 19, 20, 22, 23, and 24.
Green level LED is solid on at pin 24 of U6?
Pin 24 of U6 is the power pin. It should have 5 volts on it. The logic probe should indicate the red LED on solid when probing 5 volts.
Oh your logic probes level LED "ON" means logic high and "OFF" means logic low.
I can't clearly tell but you have E29 jumpered to E16A right? (left area of U6)
Quoted from JethroP:Checking U6 with my probe, the green "level" LED is solid on pins 19, 20, 22, 23,
Re-check if there's activity on these U6 pins immediately after you reset the CPU (by briefly shorting pin 39 to pin 40 of U9).
I have to head off for the day - maybe someone else will chime in.
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