Hi all,

I'm trying to swap a known good MPU from Space Shuttle into Sorcerer. I swapped the three Rom chips on the MPU, plugged it in and now I'm getting erratic behavior. The MPU shows Code 0, which I know is a good sign. Displays show game info. When I use coin door switches to try to get out of audit mode, my displays dissapear completely. I try turning the game off and on and the displays now show nothing. If i leave it off for about 15 minutes, I'm able to finally duplicate the behavior. I'm using a known good XPIN power supply.

Any thoughts on where to start? Was there more I needed to do to swap in the MPU other than put the Sorcerer Roms on the board?

Thanks,

Ed

This look right?

20160126_212024_(resized).jpg

I'm getting this....all four displays initially showed data and then went blank....leaving only the credit display. Flippers are active at this point. I then use coin door switches to get out of audit mode, I hear a sound effect, displays go bank and only GI is on.20160126_212232_(resized).jpg

After which, if I unplug and let the game sit for about 15 minutes I can duplicate the behavior.

Aha....that just may be it. Trying it when I get home.

The two roms I do have....hopefully will try the jumpers tomorrow. Hate it when life gets in the way.

Jumpers were it! (Well, that and remember to actually install two balls)

Thanks all!

Now I just need to fix the sound...no matter what I do there is very little volume.