Friday!!! That word doesn’t have as powerful a meaning as it used to since I retired four years ago. Every day is Friday. Or Saturday…whatever day take your pick. By the way…I highly recommend retirement. I get to do what I want to do most of the time now instead of grabbing bits of time here and there. I have a car show tomorrow with my Camaro and the club so I did get to spend a few hours today working on the dread PCC board. The chips and sockets from Mouser arrived.
The first chips I changed were U1, U6, and U10. This is tedious work. I am always very careful to keep from ruining a trace or solder spot. To keep heat to a minimum on a board I will clip all legs on a chip, remove it, then start desoldering each pin. It’s easier to get a single pin out than try to remove a chip with 16 legs all at the same time. Too easy to ruin a trace. I always use a chip socket when replacing a chip just in case it ever needs replacing again. The amount of extra work is so negligible and the cost of sockets so low that it is a no-brainer. I tested the board and it still won’t pick up a selection moving from right to left.
So, I changed U7 and U3-no joy. I quickly changed out U8, U11, the three tantulum 1 uf capacitors-no joy. So, U2 and U4 followed with the same results. I can see it now. I’ll change the remaining chips Monday probably with the same results. This is the downside to shotgunning chips without real troubleshooting work.
The new Gen 2 board for the SMC1 arrived. It stays in the package until I get this problem straightened out using the Seeburg MCU. I am stubborn of nothing else.
My Seeburg Life 