A friend of mine,
mara to be exact, has a Rob Zombie from Spooky that's acting very very strangely. What's happening is that the game gives out one ball, but after a while starts to spew out more balls like it's a pitching machine. We thought this could be something to do with the diodes on the ball trough switches, then with some other diode on some other switch in the matrix, but after we cut one leg off of each and every one 1N4007 in the whole playfield, they all tested totally fine.
The reason we were thinking about the diodes is that there was a similar situation before, where a ball hit one of the upper playfield's switches from below, damaging the diode. Changing that diode fixed the issue and the machine worked for a few months again.
Now here comes the first interesting part. The ball vomiting stops when you raise the left flipper and keep it raised. We thought that this has something to do with the EOS switch, so we shorted that as a test, but still it did the same thing, spewing balls and stopping when raising left flipper. If it starts working with left flipper raised, it works with the right flipper raised too. Sometimes it doesn't work at all, spewing balls like it's a batting cage, no matter how we try to keep the flippers up.
Hmm, well maybe the CPU board has something broken? No biggie, we got a spare one. We switched it to that, having a firmware 25 on an SD card, and then it was working all fine and dandy for a while, like one game or so. We then tried it with the latest firmware, version 26, on different SD card, and the spewing continued. We downgraded to the earlier firmware SD card with no noticeable difference. The game still spits steel balls like it needs to show us how many are inside there.
Someone said that a factory reset helped with that issue, but we only see the install factory settings option in the menu and that doesn't seem to do anything, except put the factory settings in. Is there some way to do a factory reset, and if yes, how? It seems
dung posted about that earlier in this thread, thus tagging if that's okay.
Also the game has a weird thing with the sounds, or the music to be exact. Occasionally the music sounds like it distorts, clipping the sound very nastily. I noticed that the music also seems to slow down, giving me the feeling that the CPU is having a hard time keeping up. I encounter similar sounds when I'm making music and I add too many software instruments and my computer can't keep up, slowing down the music and missing audio as it's playing them out of sync. We tried lowering the volume, as that helps with the clipping if it's amp related, but that didn't help. We raised the volume significantly, and it didn't make it worse, signifying that it's probably not the amp circuitry clipping or such.
So, I ask you wise people of the internet: what can we do from here? Any advice on where to continue to look? We'd love some help, as we're starting to lose hope and have no idea what to do.