A couple of weeks ago, I picked up my first 'modern' pinball machine, a Williams JackBot. The owner didn't seem to know much about it, and the whole playfield didn't light up except for one bulb. Speaking of which, the playfield was rather dirty and seemed as if it was never cleaned before. After taking off the translite, none of those bulbs worked either! I soon got to work on it and replaced the old bulbs with new ones, and the playfield and translite soon lit up. The ramp on the machine had trouble going up and down, but a little greasing and cleaning fixed the problem. I soon realized that the upper playfield lights never came on (the ones in and behind the opening visor) and the flashlamps on both the cabinet and playfield never worked. There is also one strand of lights that does not work in the backbox and the coin door bulbs don't light up. I'm fairly new to pinball and don't know a lot about the electrical components, but I have a feeling that it might be a fuse. Any suggestions?

Just removed the connector and it's perfectly clean. If it's not that, what else could be causing the problem?

It is the upper GI and the inserts/flashers/feature lights. The flashers don't go off as they should, and the whole upper playfield doesn't light up. I do have a multimeter and could test the transistors.

I made sure to close the coin door before testing. After testing the fuses, F106, F107, and F108 are out. No power is shown going through them, so they might be done for. I did notice that F108 was strictly a 250V, while F106 and F107 were both 250V/313. I did notice that F111 is also a 250/313, but features a different ampage which is 3. F108, F106, and F107 all have an ampage of 5. Are the fuses the same for each, but have a different ampage? Also, what would be a good place to find fuses?

That makes sense! I've got to order new fuses. Would these work?

ebay.com link: itm

Just sent. I appreciate your help. I'm new to pinball and would have never figured this out.

Thank you! So the slo blo fuses can go in any slot as long as the ampage is matched?

I have a new problem! Went to turn the machine on today, and the lights under the playfield don't light up. An error message on the display says "check fuses F114 and F115." I checked those and they get power through them. Is it yet another transistor?