Thanks for the encouragement, I definitely appreciate it.
I abbreviated a few steps in that last post.
I pulled the board 4 or 5 more times and went through the following:
- Pulled all the chips 1 by one and gently wire brushed and washed down the pins with alcohol so they looked all shiny.
- I reflowed the sockets down where U7, U8 and U11 are - as best I could with the corrosion residue causing some problems there.
- I then straightened the pins in the ICs and re-inserted them.
As I did this I noticed that 1 of the pins on U6 (which was an original Bally IC) had (at some point before me) broken off and someone had soldered on a new leg: Piggy-back style. It looks reasonably serviceable.
I also noticed that one of the legs on U7 was a little wobbly. I gingerly put it back into the socket but I daren't remove it again : (
I think there is a good few more hours of messing about ordering and trying chips etc. and the more I look at the corrosion the more I think I'd need to do that reset section - again.
Even after all of that, if I get it to boot, I might still have the intermittent problem that I was originally trying to solve. I have a hunch (possibly unfounded) that those random and weak solenoids were something to do with that MPU board.
At this point, with my day job I can earn more in 1/2 a day than I could save diagnosing and fixing for another half a day continuing down this path with the chips and I'd still have to buy new chips, socket, reset section, etc, etc.
I know it isn't about the money but I'm tired, beaten and I just want to play my pinball, not tune it's dang carbies : )
Besides I'm about to sink more time than I could ever "fathom" into this project...
http://australianairstream.blogspot.com/Thanks for the help and encouragement guys. I may be back if the Alltek doesn't fix my original intermittent problem :)
Matt.
