After all your help, I fixed a troublesome 25K7191 that stumped me.
So I went back to may stack of part boards hoping to bring another one back from the dead. I have two candidates, but the differences in these boards confuse me. These boards are from an arcade auction buy at a liquidation sale.
They are all about the same, that is, they have the same layout and the same chipsets, same part number boards ; but they have these mods all over them.
One of them has a electrolytic cap on the neck board, and the other does not. One has a cap patch in the mods, and the other has a cap the one I just fixed doesn't have by IC2.
One has cap on IC1.
The one I'm looking to fix first has what looks to be old mods removed, but what looks like brand new caps in it. Another has no mods at all but looks like all the caps are bad. Years ago Ken Layton told me I screwed up royally by removing these mods, as they were factory mods.
Is there any reference for this? My plan was to take the board I wanted, pull all the mods off one of the parts boards I have that has the mod, and go from there. I just don't want to miss one.
Any thoughts?
So I went back to may stack of part boards hoping to bring another one back from the dead. I have two candidates, but the differences in these boards confuse me. These boards are from an arcade auction buy at a liquidation sale.
They are all about the same, that is, they have the same layout and the same chipsets, same part number boards ; but they have these mods all over them.
One of them has a electrolytic cap on the neck board, and the other does not. One has a cap patch in the mods, and the other has a cap the one I just fixed doesn't have by IC2.
One has cap on IC1.
The one I'm looking to fix first has what looks to be old mods removed, but what looks like brand new caps in it. Another has no mods at all but looks like all the caps are bad. Years ago Ken Layton told me I screwed up royally by removing these mods, as they were factory mods.
Is there any reference for this? My plan was to take the board I wanted, pull all the mods off one of the parts boards I have that has the mod, and go from there. I just don't want to miss one.
Any thoughts?
