I still need to replace the fuses on the back box, and there is a pair of fuses under the playfield, but they're so old and worn that I can't even read the amperage and if they're slow blow or not. IMG_1193.JPG IMG_1194.JPG IMG_1195.JPG IMG_1196.JPG IMG_1197.jpg IMG_1198.jpgWell, I wish I knew the flash thing because I think I used flash a few weeks ago to take pictures of all the molex connectors before disconnecting the backbox.Īnyway, I replaced the 2.5, 4, and 20 amp fuses. I wanted to break out the multimeter and start checking all of my wiring connections but I haven't been able to find a decent wiring schematic online.ĭoes it sound like I'm on the right track so far? Anything else I could/should be doing? And does anyone happen to have a decent link to a wiring schematic? The previous owner said the game hasn't been played in years. I replaced the double A batteries in the backboard, just to be thorough. I'll be hitting an auto parts store to see if I can't find the other ones. I started by replacing some of the fuses, the ones I could find at radio shack. Not the illumination lightbulbs, but the lights that run under the playfield that let you know what kind of bonuses are active, that kind of thing. Just about everything turns on except for some bad bulbs in the backboard and the table lights on the playfield. The add credit button works even though the coin slots don't. I plug the machine in, and it mostly lights up. The other problem has me stumped for now though. One of the flippers had a bad spring and I replaced that easily enough. It's pretty worn out but I think it's in good enough shape to be a good machine to learn the craft on. I mean, what arcade is complete without a pinball machine? It's fun! But I had someone respond with an offer for a pinball machine that I just couldn't refuse, so I thought I'd try out pinball too. Thank you for the recommendations! I will start with the quick ground test and escalate from there.New user here! Usually I stick to arcade games, buying on craigslist to work on my collection. I'm just not sure the solenoid test on a system 7 can activate sounds or not. It is possible that you could also do this running the built-in solenoid diagnostic (you can on system 3-6a). To reliably test the other half (whether they go to ground when they're supposed to) you will need to run the pincoder sound ROM. That will at least give you half of the picture. Turn the game on and go into audit mode (so you know that no sounds are supposed to be playing) and then check for ground on each of the wires. If you dont have a chip and programmer, you can start by testing each of those wires to see if they're stuck on ground. The pincoder sound ROM will help you troubleshoot that. So, you just need to test each of those wires to see if they operate correctly. This is what produces the incorrect sounds. Basically, I think one or more of those wires to the sound card are either stuck on ground, or are not grounding at all. If you download the pincoder ROMS and look at the instructions for the sound test you'll have a better picture of how it works. To get the sound card to play a sound, the MPU board grounds a specific combination of those wires momentarily and then un-grounds them. The fact that when connected you have sound playing, albeit the WRONG sounds at the wrong time means the signals to the card are jumbled.Įach of those wires represent a binary digit (ground or no ground). With no signals getting to the card it does like it should and not play ANY sounds. the wires on 10J3 are used to instruct the sound card to play a sound. Just no background sound in play and then there is that repeating tone in attract mode. So what you are suggesting based on this is that the issue is not with the sound card? Like I said I have speech and other in game sounds. Just quickly wanted to conduct your test of unplugging 10J3. The sound test ROM will be the most use to you. You can also try these test ROMs: They will help you track down problems with your entire machine. if the sound problem goes away the problem is NOT on the sound card. Disconnect 10J3 on the sound card or 1J8 on the MPU board and turn on the game. It could also be a problem entirely on the sound card. What im saying here is that there is a communication problem between the MPU board and the sound card. When the sound increases in speed/intensity like that its because the the sound card has been told once again to play the same sound. That is, the sound card is told once to play a sound and then the sound card plays it over and over until its told not to. Some of the sounds in williams games are cyclic.
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