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Bally Solid State Feature Lamp Issue
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Question
poidapoida
I have two feature lamps out on a Bally Fireball 2. I got what I think are the equivalent SCRs from Jaycar to replace the suspect ones. Before replacing the SCRs I tested the lamp socket and bulb by jumpering them to another feature lamp and tested continuity from the scr to the lamp and both were good.
The 9k Doomsday bonus SCR is a 2N5060 which I replaced with a ZX7010 from Jaycar and the lamp now works.
The other is the left Fireball bonus which uses MCR 106-1, but you can use MCR106-x and they will work apparently. So I replaced it with a ZX7006 from Jaycar. https://www.jaycar.com.au/c106d1-400v-4a-scr-to225aa/p/ZX7006 but the lamp still doesn’t work. I tested the new SCR using the diode setting on a MM and got just under .6v from cathode to gate but no reading the other way where it should have between 1.4v and 1.6v
I then pulled a MCR106-1 from the board that wasn’t running a lamp, tested it good, and then installed it. The lamp still does not work. Not sure what to test next to find the issue. Is it possible that the U chip would fail on one lamp, I have only seen mentioned that it tends to fail in on a group of lamps.
Cheers
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