Igt S Plus Blowing 6 amp fuse

[freds]

More

[freds]

more

[freds]

even more

[freds]

some more

[freds]

last one I think

[twinfire]

Guys, this just isn’t making any sense.

fred, these are your quotes:

when the molex plug behind the hopper is disconnected it won't blow

The fuse only blows if the molex is connected. If it's disconnected the fuse does not blow

I removed the hopper and disconnected the beau plug and the SSR also. If the connector was connected the fuse would blow.

So, essentially what you are telling us is that plugging in the wire harness that now isn’t connected to anything the fuse still blows, but when un-plugged it does not.

This can only mean the small end of the wire harness that goes to the beau plug/SSR is somehow defective. Are all the pins in the molex plug in good shape, not bent or touching anything, no debris inside the connector that could be causing a short?

[Stayouttadabunker]

I looked at all of your pictures...best I've ever seen.
I see something unusual.
In this photo below, pull out the smaller plug and leave it out for now...it's NOT needed and I don't know why it's in there or where it's going until you follow it up.....I'm going to circle it.
It's in location [J13] on the motherboard.
It's supposed to be the motherboard header for a "printer" that was never sold as an option until IGT came out with the S2000 platform.

Also, remove the MPU again and look undeneath for bent pins.
The MPU, for your information, is the big upright board that has all the chips with the black knob.
The motherboard ( It was always wrong, but that's what IGT called it...really should be called the "backplane") is the board on the floor with all the connectors plugged into it.

I see another possible problem too but you should look at these first.


Click on photo to enlarge if needed...>>>

[freds]

I did look at the pins in the connectors as well and saw no bent pins. I will try pulling the J13 plug tomorrow and get back. Essentially twinfire is right that the harness leading away from the molex not going to anything is causing the fuse to blow. For me it has been a headscratcher. This machine was brought to me from someone reaching out thru a post on facebook. He told me it was working last year and developed this problem 7-8 months ago and has not worked since.  What I do not know is if anything was changed or tried before me. He said he tried replacing the fuse but never got past that. I have pulled the mpu from the backplane and looked for bent pins and all is good. Will go another round tomorrow.

[Badbaud]

Completely remove the backplane board and check for a stray coin underneath it.

[a69mopar]

I would pull the harness apart. The one from the plug that blows the fuse. I have had wires shorted in hidden spots, such as where the tie strap is. If it only blows the fuse between that and the hopper plug. I would also use my dmm to check for shorts in the hopper beau plug .

[a69mopar]

Completely remove the backplane board and check for a stray coin underneath it.

This is a good idea also. One of the first checks to do

[lookes]

Does it blow fuses with the hopper out of the machine? It's unclear to me.

[freds]

Thank You for all the responses ! The mystery may be solved. When I initially got the machine I looked for usual suspects of loose coins or metal screws and washers somewhere. As of this morning twinfire's earlier response of wires going nowhere got me curious.  With all the wires disconnected after the molex I connected them one by one and powered up after all were connected. I was in a state where the fuse held with everything hooked up. After a few minutes I closed the door and the fuse blew again. I had checked the comparitor earlier and saw nothing of concern. I removed the comparitor bracket and looked things over. I did find a nickel wedged just after the comparitor behind the plastic ramp to the diverter. The diverter coil connection was right there with a little room for it to bobble front to back. It would bobble when I would open and close the door. Probably why the behavior would sometimes be inconsistent. I removed it and so far game is playing fine for about an hour now. Thank all of you for your responses !

[Stayouttadabunker]

 There's the short!... 
  Glad you found it! 

Now you gotta tell us where all the J13 wires go?
There's NO printer!
If you have one, you'd have the first I've ever seen on an S+ lol

[freds]

No printer. I wire tied all the wires again. They look like they feed back to the molex plug.

[Stayouttadabunker]

okay.at least we know where they run to now.

It sounds like the nickel shorted out against those long wire tabs on the rectifier chip for the divertor solenoid on the divertor gate.
That's not supposed to happen because IGT puts a small tube over the wire tabs...oh well...learn something new all the time. 
Get this....>>> In the schematics for the divertor solenoid, the fuse that protects that line...is that 6A, 24 VAC fuse. haha