The boards needed all the header pins replaced?
nearly every set had rust on them and to remove all the corrosion and to seal the board with clear lacquer properly all had to be removed.
Plus I get them at a very good price from my supplier.
On every board every fuse holder and fuse was replaced with new parts due to corrosion, Every component on the power supply was replaced with new parts. nearly every track on the power supply had corrosion and the overlay (the green stuff covering the copper on the tracks) was lifting everywhere due to the corosion
Every component on the Interconnection board was replaced with new parts.(except for 1 resistor, i could not find a resistor with the same value)
Every diode, capacitor, bridge rectifier, Resistor and the relay on the Aux board was replaced I removed the rust from the transistors and re used them.
Nearly every component on every board had rust on them.
The sound board was the only board that only had minor damage but all the I.C. sockets had to be changed and all the electrolytic capacitors where replaced.
The only reason the MPU / Driver board was replaced with a new one was because the cost of all the components alone was nearly as expensive as a new board.
It was more economical for me to rebuild the rest of the boards than to replace them with new boards.
I just thought i would explain why I replaced all the components.
You are doing a top job Milsy on this restore. and the Black Knight 2000 Clock you sent me is absolutely stunning. If your restoration work is anywhere as good as your clocks then this will be one nice machine when it is finished.
I am very pleased to have had a part in this resto ( as i am with any resto that i help with on AP)
Wow, that's amazing. Sounds worse than any PCBs I've ever had come across the bench. I've seen some pretty awful Bally 80s MPUs riddled with corrosion that needed dang near everything replaced, but this beats that!
Definitely a labor of love!
