Ok so where to start. I have been wanting a pinball machine for the house for years. I routinely go to a local pinball arcade to get my fix. I recently ran across an ad for a non working F-14 Tomcat for $100. I do not know much about pinball but I figured worst case it could be parted out for more than my initial investment. A couple phone calls later and I brought it home. I was told at the time of sale that it had a bad main board
The good bad and ugly. I started by popping out the fuses and checking for continuity everything checked out but will be replacing all of them soon. I then unplugged the main board from power supply board and checked voltages at the ps board connectors. everything was pretty close to spot on except the 34v was at 42v and the 100v was closer to 110v. The 100v ive read this is a common issue and i will replace the display with a low voltage one if this project pans out. Hooking everything back up and trying to power the machine up i get some lights but not much more. diagnostic code shows 7. tried the cpu test switch on the mpu and one time it made it to 8. upon removing mpu from backbox and a closer look it appears that there were some repairs done and some possible burnt transistor by the u54 chip which is refered to in the manual for code 7. playfield is fairly dirty and alot of the inserts are raised above the playfield. I have not depopulated or cleaned yet but as far as i can tell the paint does not look that bad, maybe some very slight paint cracking but i think its just dirt on the playfield that hasnt been cleaned in forever. so i guess the big question.
1. Would this be worth trying to restore? Im thinking I can get it into nice shape for under $1000, but Im no expert. Also I do not consider my time "billable" everybody needs a hobby and time is part of that
2. Is the 42v an issue. do I need to consider rebuilding the power supply
3. I think those are the main questions for now