Mystic
Bally, 1980You're currently viewing posts by Pinsider schmoo.
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I have swapped in several good relays and none of them are working.
I have replaced the Q15 components which drive the relay. Grounding Q15 does not activate the relay nor does it fire during the solenoid test.
The SDB worked fine ( including flippers) when it was in my Bally Hottdoggin so I'm thinking it's MPU or wires.
Looking for a list of places to look starting ( obviously) with the most likely culprit(s).
Thanks!
Quoted from vec-tor:Double check. Did you replace the 1N4004 diode CR15?
Yes, I swapped out CR15 when I did Q15.
Quoted from wdennie:start checking the connectors between MPU and SDB.
Started my search with SDB J3-5. I am getting continuity between it and the transformer J3-9, but unlike the transformer, I am not getting 44 VDC. Should SDB J3-5 be showing 44 VDC ?
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Brampton, ON
Franklin, VA