I picked up a Street Fighter 2 machine that suppsibly came from Italy
that someone could not get running. I was looking for a winter project
but now find myself fooling around with it nightly. I have a couple
things that I can't figure out. First of all the machine only will
boot when I turn the machine on and then go to the A2 power supply
board and turn the power supply pot down and then back up. At this
point all the boards are flashing properly. I had a second power
supply board and it does something thing very similiar. I doubt that
both of these boards are bad. Enough power isn't getting to the CPU
board for it to boot properly. The only way I can prove that is to
take a reading from the A1P1 connector (I will do that tomorrow).
Another problem is that all the information isn't fitting on the
display. Wording is cut off the top of the display and I only see the
the top half of the scores for player 3 and four. It is almost like
the resolution on the display doesn't match up with what is being
outputed by the display board. I tried another display controller and
it didn't work either. It almost seemed like it was showing a gassed
out DMD but it does work with the other controller board but it just
doesn't fit on the sreen. Anyone have any ideas on this? Another real
confusing problem is that I can't seem to get the ball to launch to
the plunger. It do not hear any of the coils fire that move the ball
to the plunger. If I put some balls in the machine and hit them in the
backfield they do not kick out of the holes and if I let them drain
they do not kick the ball to the trough. Lastly it now seems like the
left ramp flap want to go up and down all the time. In test mode both
of these ramp flap work fine but when I start a game the left one want
to keep on going up and down. I have a new rotten dog amusements
driver board in this machine so I pretty confident that that board is
working properly. I examined this area and everything looks right.
Any input on any of these problems is greatly appreciated.