Hey Everyone! Picked up a new project today, a Gottlieb Dragon. I've worked with a bunch of System 80 and 80b games, but never a System 1. Here's where I'm at currently:
Powering on the game, I immediately get GI on both the playfield and head. After about 5 seconds, the GI turns off for a second, comes back on, and the displays turn on. Player 2, 3, and 4 all show "000000". The credit display shows "03 70". Player 1 display needs some repair (need to repin the connector).
My understanding is that what I described is the normal boot process, is that accurate? I hear no sounds, and nothing else happens.
When I attempt to add a credit or start a game, nothing happens. It simply continues to sit with the displays at all zeroes and the credit display showing the digits mentioned above.
- Tested power outputs in the power board, 5v and -12v test good. 60V was good.
- Remote battery pack was installed by previous owner, but the batteries and holder were corroded, so currently no batteries are installed.
- Driver board appears to have several bad transistors based on testing.
- interconnect between CPU and driver is brand new
- Ground mods appear to be done
Suggestions welcome! Thank you in advance!