S6000 coinundrum

[mr-monoxide]

So I have these 2 S6000 machines, I got them all at once along with a few more S6000's as well as part of a mass purchase. The problem I'm having with these 2 machines in particular is coin acceptance. One will take coins to the hopper but not register them. The other one just diverts all coins back to the tray. Now I know what your thinking, bad optic board on the first and bad comparitor on the second. But nope that doesn't seem to be the problem. Here's what I've done so far, on both machines I have replaced the coin in optic boards, the comparitors, the comparitor wiring harnesses and I've even tried different MPU's all from other working machines with no luck, problem still exists. I also tried reseating the wire harness plug into the backplane board, still nothing. I determined each machines problem is specific to that machine, the problem does not follow or change with any parts replacement. So now I'm scatching my head in confusion, any ideas? Thoughts on the matter?

[mr-monoxide]

Ok I got the one that wouldn't register coins working. It was an issue with the prism, now all coins register correctly. Still having a problem with the other one though. It still diverts all coins to the tray in spite of replacing everything except the wiring harness. If I keep the rake open the coin will go to the hopper but is not registered. No prism issues with this one and all wires to the comparitor and optic board have correct voltage readings. The optic board led is lit as well but this machine refuses to accept coins no matter what I do. Guess I'll have to crack open the wiring harness and start tracing each wire one by one. Not really what I want to do but I cant think of anything else to try.

[rokgpsman]

just thinking here,,,

Your coin comparitor sample coin is ok or you tried a different one? (or maybe you tried a known good working comparitor that already had a known good sample coin).

Did you double-check any and all the preference settings that might account for this, like a hopper setting or a credit limit set to something whacky that would keep the machine from accepting any coins because it would go past a credit limit? Or the machine set to coinless operation? If all of the hardware possibilities check ok then I'd take a slow, hard look at the operational settings to make sure they are ok. It sometimes just takes one setting selected to the wrong thing to foul things up. Are the game chips normal ones for that machine, not special tournament chips? Is your machine somehow in "Demo" mode,,,that doesn't allow coins to be inserted.

PS> what do you mean by the "prism" having an issue, I'm not aware what part that is??

[mr-monoxide]

Yes I have swapped out all coin in related parts with working ones from other machines and I have reset and verified all option settings but the problem persists. The game chips are factory issue with nothing especially unique about them. I have 2 other machines with the same chips and they work perfectly. I even  installed a mpu from one of the working machines but that made no difference either.

The prism is just that, a little glass prism located on the backside of the mounting block that reflects and returns the coin optic beam back to the optic board. Misalignment with cause the beams path to be broken and no coins will register.

[mr-monoxide]

Just for the record, kicking it didn't fix it either... 

[rokgpsman]

well, at least you have another machine of the same model that works, you're ahead of most people that aren't that lucky when a difficult problem happens. In theory, you should be able to use the good working machine to figure out what is causing the problem on the broken machine. Just to recap, you have swapped all major assemblies from a working machine into the broken machine and the problem persists? And you have carefully checked the various preference settings? Can the power supply cause something like this? 

[mr-monoxide]

Yes I have swapped all related parts with known good parts and the problem remains. Yes I have checked all settings and options which are correct, the problem remains. I'm not aware of the power supply causing any issue like this. In fact other than the coin in issue the machine works perfectly. I can add credits by inserting a bill in the validator just can't get it to accept coins.

[mr-monoxide]

The problem is in the machine itself not with the parts. At this point I'm suspecting a bad or broken wire or possibly a bad solder joint or wire connector. As I said earlier I'm just gonna have to start tracing wires in the harness one by one until I find it or just replace the entire wiring harness itself which would probably be easier if I could find another one.