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Author Topic: Game King "3902" Board Errors  (Read 8129 times)
MorfZilla
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« on: October 27, 2009, 03:04:47 AM »
 Scratch Head I'm back again, I am having issues with Game King boards "3902", the errors are: puzzled screen, security Code, coin in jam, meter disconnected, no signal, red screen.  Scratch Head
 Help I would really appreciate any and all assistance.

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StatFreak
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« Reply #1 on: October 27, 2009, 03:34:46 AM »
It sounds like you are having multiple issues with multiple units. It would be best to tackle them one at a time and to describe each issue at hand in detail.
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« Reply #2 on: October 27, 2009, 10:01:55 AM »
coin  jam , and meter should be  the board on front door not  in all the way  other could be simm not  seated right
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« Reply #3 on: October 27, 2009, 01:34:06 PM »
I too have a 3902 board with a coin in jam , meter disconnected error,  Mr Blueridge ( JIM ) tells me it is most likely a bad chip at U 74 on the main board.  I have tryed this board in 5 different GKs and the error follows with the board. 
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« Reply #4 on: October 27, 2009, 10:24:14 PM »
bring the board up with you
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MorfZilla
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« Reply #5 on: October 29, 2009, 02:59:58 AM »
Well statfreak, yes multi issues. I would like to start with the coin in jam. I don't think it's not the I/O cards, I removed the coin collecting part and put in a bypass, I swap the the gameboards with the same software and the coin in jam is gone. I have been told to replace the U74 chip but I dint think I can. if you know how to remove it would you u please explain.
thank you for your input


slotsteve,  the I/O cards are good its just the board, what do you mean by simm not seated right?
thank you for your response



Buzz, yeah my only issue is that i am unfamiliar with how to unsolder when it is only soldier on top, do you have any tips on how to? thanx for your line.
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« Reply #6 on: October 29, 2009, 03:35:46 AM »
I would like to tell you just how it's done but I have never changed out one of he smaller chips. Truth of the matter I can't even find U 74 on my board. thinking maybe I wrote it down wrong when Jim gave it to me he did say the chip # was MM 74C240 WM Fairchild  P09AB. If your in a big hurry give Joey a call at NLG ( phone # is at top right of every page on this site ) I'm sure he would repair it for you,
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« Reply #7 on: October 29, 2009, 11:21:47 AM »
Quote from: Buzz on October 29, 2009, 03:35:46 AM
I would like to tell you just how it's done but I have never changed out one of he smaller chips. Truth of the matter I can't even find U 74 on my board. thinking maybe I wrote it down wrong when Jim gave it to me he did say the chip # was MM 74C240 WM Fairchild  P09AB. If your in a big hurry give Joey a call at NLG ( phone # is at top right of every page on this site ) I'm sure he would repair it for you,


You didn't write it down wrong, look near the connector for the M M Lite Board on the end near the edge connector, I will try to post a pic
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MorfZilla
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« Reply #8 on: October 29, 2009, 02:40:15 PM »
here is a pic of U74 buzz.

* U74 on GameKing board.jpg (161.61 KB, 800x600 - viewed 356 times.)
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et2399
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« Reply #9 on: November 04, 2009, 04:15:35 AM »
MorfZilla, coin in jam, meter disconnected is due u74 are broken;   see the pic. You can use this metod to desoldering the chip and change this.      <a href="http://www.youtube.com/v/OiRaOEgJ2Qg&rel=0" target="_blank">http://www.youtube.com/v/OiRaOEgJ2Qg&rel=0</a> .  I hope that this helps you

* u74 fail.jpg (12.85 KB, 320x240 - viewed 690 times.)
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« Reply #10 on: November 04, 2009, 08:39:11 AM »
Quote from: et2399 on November 04, 2009, 04:15:35 AM
MorfZilla, coin in jam, meter disconnected is due u74 are broken;   see the pic. You can use this metod to desoldering the chip and change this.
http://www.youtube.com/watch?v=OiRaOEgJ2Qg .  I hope that this helps you


et2399, K+ for posting that desoldering video. applause
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« Reply #11 on: November 04, 2009, 11:09:22 AM »
Looks like the person in the video did this AT least one time before. bust gut laughing bust gut laughing

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in with a cold solder joint and still work. arrow

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