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Author Topic: Coin in Jam  (Read 1426 times)

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Offline Border01

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Coin in Jam
« on: March 26, 2023, 07:43:32 PM »
Have a new to me IGT I Games Cleopatra. First thing I did is change MPU battery, cleared with key 40. Have coin in Jam.
So far I have Replaced from working machine
Coin Jumper plug
All 3 I/O boards
Not sure what I’m missing unless maybe setup issue
It is Bill in
Ticket out no TITo

Can’t figure it out
« Last Edit: March 27, 2023, 09:18:21 AM by Tilt »

Offline Tilt

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Re: Coin in Jam
« Reply #1 on: March 26, 2023, 08:15:28 PM »
Bad MPU board.  U74 specifically.  It's located next to the MML2 connector.  Take a close look at it for signs of damage like a burn mark, bubble, or crack on the top of the IC.  Often it will show physical signs of damage, but not always.  It usually ends up that way by removing or installing the MPU board with the power on, so make sure to turn the power off before removing or installing any circuit cards.  The fact that you have both a Coin in jam and meters disconnected error points to U74 on the MPU 90+% of the time.  This assumes we're talking about a 3902 MPU.






Offline Border01

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Re: Coin in Jam
« Reply #2 on: March 26, 2023, 08:56:06 PM »
I am sure you’re correct. I will look for a new board. I believe I’m also missing a pixel card. I only have one that says 2 of 2?

Offline Tilt

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Re: Coin in Jam
« Reply #3 on: March 26, 2023, 09:02:42 PM »
No, you're not missing a card or you would get an yet another error message.  Your CGF SIMM should say 1 of 2 and the PXL card 2 of 2.   

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Re: Coin in Jam
« Reply #4 on: March 26, 2023, 09:12:09 PM »
Ok thanks very much. I’ll look for a new 3902 board. I appreciate your help

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Re: Coin in Jam
« Reply #5 on: March 26, 2023, 09:14:36 PM »
I’ll swap boards from my working Alien game to confirm board issue

Offline Tilt

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Re: Coin in Jam
« Reply #6 on: March 26, 2023, 09:17:02 PM »
Yep, that will confirm it 100%.  Check with Jim (Midwest Slots) if that's the problem he had some 3902 boards available.

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Re: Coin in Jam
« Reply #7 on: March 27, 2023, 08:27:55 AM »
Well it was definitely the 3902 MPU. Machine is up and running perfectly. Thanks so much for the help

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Re: Coin in Jam
« Reply #8 on: March 27, 2023, 09:18:06 AM »
Glad you got it going  :applause:

Offline The laneman

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Re: Coin in Jam
« Reply #9 on: June 10, 2023, 08:52:28 AM »
Is there anyone on here that can replace the U74 chip on my 3902 board?

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Re: Coin in Jam
« Reply #10 on: June 10, 2023, 11:04:43 AM »
Check with member retro tech repair.  He can probably replace it for you.

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Re: Coin in Jam
« Reply #11 on: June 10, 2023, 11:22:22 AM »
Thanks for the reply.

 

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