Archived from groups: rec.games.pinball (
More info?)
Try swapping U11 (bottom 6821) and U10 (middle 6821), see what happens.
Chris
<bzahra@cogeco.ca> wrote in message
news:1127624812.302025.309210@g14g2000cwa.googlegroups.com...
> shows 4 flashes? ,what is this problem?
>