Hi folks - I’m fixing up a Black Knight that I grew up with (my mother got it for her birthday 30 years ago). This is my first repair, so while I’ve done a lot of reading in the last 72 hours, I’m not entirely sure what I’m looking at.
The machine has a number of issues, but most pressing is that the display is flakey because it’s keeping me from reading the switch test results. When I turn on the digits display, some numbers show up great and others are missing. If I let that number sit for a while, it will often show up. Examples here:
I swapped the player two and three cables and the problem moved from player two to player three. I reseated the cables on the display board, but no change. I haven’t changed the connections on the cpu board. When I tried to swap the credit/match cable with another display to see if it moved, neither worked (and I realized it was a 4 digit not a 7 digit display, so probably expected).
It sounds like a connection issue since the problem moves (at least on the player displays) but is it possible this is out gassing? I don’t have a solid understanding of what that looks like.