Quoted from Ballypalooza:
It seems that of all the tutorials on the Bally boards, the SDB doesn’t seem to get covered as throughly. Maybe it’s just me. So many things happening on the board. Had about ten driver boards, majority have no displays. No click on flipper relay, 5 volt hacks with weird looking components, all solenoids locked. TIP issues are no big deal. Any great detailed reading is appreciated. Pinwiki seems kind of light compared to the other stuff.
Thanks

I think the Bally pinball repair pages cover the SDB quite well, including the reliability upgrades. There is really not a lot going on on that board, it just looks busy because it provides a home for all the solenoid drivers which are just redundant circuits. Otherwise it provides a home for display and logic power conditioning, a home base for fusing and flipper relay, that's about it.
http://techniek.flipperwinkel.nl/ballyss/rep/index1.htm#cap

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