IGT S plus will not take coins

[slots4home]

All the years I have been working on splus machines I have never had this problem
I have a Splus game that will not take coins. I have replaced the coin comparator, coin in optics, and loop but still will not accept coins. The game works with the BV. Could it be a bad processor board or mother board?
Thanks as always
Darell

[stayouttadabunker]

Where do the coins fall to?
Hopper, drop hole or coin tray?
Also, what SP chip are you using?
Could be just an enabled "coinless mode" setting.

The parts you've swapped - known good parts from working machines?
Could be something as simple as the "Sample Coin", stuck rake, or sensitivity dial.
Try the popsicle stick test?

[slots4home]

They drop into the coin tray.

[stayouttadabunker]

They drop into the coin tray.

1). Bad coin comparator. Try a KNOWN GOOD one.
2). Stuck rake. Could be binding against opening...or wiggle two gray wires...
3). Sensitivity dial too far clockwise. Turn all the way back counter clock-wise then turn clockwise a quarter of a turn.
4). Bad Sample Coin...replace with another one.

Coin-In optics could be okay because the rake is not opening.
They bypass the optics
and fall back into the tray.

[slots4home]

Comparator is good. The only thing i have not replaced is the mother and processing boards.

[stayouttadabunker]

hmm...
I'd swap chips into another MPU.
Easier to do that than changing a motherboard.
Could be a faulty IC coin registering component on the MPU.

[slots4home]

That is next
Thanks Bunker

[stayouttadabunker]

If swapping MPU's doesn't work, then its not so much the motherboard...
because the door harness runs back to the MPU via the top of the card cage.
But yes it's related, it does plug into the back of the motherboard inside the cage.
After that, it's the coin/door harness - all of it...right down the whole loom back to the MPU.

There's are very few SP's that allow one to put a game into "coinless mode" but very few
and I doubt you put it into that mode.
Unless, you picked up the machine set this way from a casino auction?

[slots4home]

This game was working
I did end up swapping out the board and I will bet that is the problem
Hopefully problem solved

[Jim]

Darell,

if you could press the small white button on the coin optics board and the game accepts credits and plays, then the problem is with the cc circuit. you can find out for sure what the problem is:

because you have a belly door, unplug the cc cable harness and extend it out through the belly door opening, close door, when insert coin lite comes on you should be able to measure 24vac on pins 4 and 6 of that connector. the black and yellow wires. if no 24vac then your problem is in the wiring or the motherboard or the board itself.  since the game worked I'm with you on it being the board.

Q-18  provides the lockout signal to turn on the cc-16 by applying 24vac to it.   the three pin connector behind the cc-16 metal housing, where the harness for the cc plugs into, the orange/violet wire and the orange/ green wire provide the 24vac,

Jim   

[slots4home]

Thanks for the information Jim.
I will check it out.
I will not be at the machine until next week when I go back to check ot out.