Cyclone
Williams, 1988You're currently viewing posts by Pinsider barakandl.
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Rows (i blelieve) go CPU -> PIA -> NOT Gate (7404?) -> pre transistor -> main transistor
The cpu is good because it is booting up.
I would stick a logic probe on the PIA gate, make sure it is pulsing. Then look at the TTL gate output, make sure it is pulsing. Compare to other rows and replace part that is bad. If it is pulsing up to the pre drive base, replace both pre transistor and main transistor.
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Copley, OH