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Author Topic: Game King with 3902 board has speaker static  (Read 182 times)

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Game King with 3902 board has speaker static
« on: February 12, 2018, 09:48:23 PM »
I have a 17" GK with a 3902 board that has static in the speakers. It's louder when the screen goes blank when the cards are shuffled before the deal. I have tried a different MMII Board and power supply. The machine has a Ceronix LCD Monitor. I know about the static noise on the 502 MPU used in the S2000 slots, but have not heard of this on a 3902 board. Any ideas?


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Re: Game King with 3902 board has speaker static
« Reply #1 on: February 12, 2018, 10:46:44 PM »
Gary, I remember that the EPROM based 4.x games didn’t have any static, but when I moved to the SIMM based 5.x games, screen transitions and other times would produce static on my machine.  Another reason why I moved to 044 eventually.


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Re: Game King with 3902 board has speaker static
« Reply #2 on: February 13, 2018, 02:21:05 AM »
Jason,  I just did one identical to this game a few month back and didn't have this noise. If I did, it was only 10% of this ones static noise. I'm sure others won't notice it, but to me it's not right.
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Re: Game King with 3902 board has speaker static
« Reply #3 on: February 13, 2018, 02:37:15 AM »
Only thing I can think of off hand is another MPU...unless there was an issue with the amp/speakers.


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Re: Game King with 3902 board has speaker static
« Reply #4 on: February 13, 2018, 05:46:59 AM »
I had thought about the MPU and speaker amp board, but I figured I'd ask. I might swap out the amp board, but to me it's happening when the MPU is under a load calculating its next card hand if that makes any sense.
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Re: Game King with 3902 board has speaker static
« Reply #5 on: February 15, 2018, 05:51:38 PM »
If not the MML2 board, then I'd suspect the MPU board.  C59 likes to  :burningresistor: and when it does it can cause hissing, humming, and the noises when the MPU is doing things.  If it isn't burnt it could still be bad. 

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Re: Game King with 3902 board has speaker static
« Reply #6 on: February 15, 2018, 06:56:05 PM »
Does the Ceronix LCD monitor have a "brick" style power supply module, or does the monitor connect to normal 115 volt ac source? I'm wondering if noise from the monitor is getting back thru it's power supply into the sound? Or maybe the inverter on the monitor is radiating interference noise that the sound system is picking up.

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Re: Game King with 3902 board has speaker static
« Reply #7 on: February 16, 2018, 10:05:37 AM »
The Ceronix LCD monitor is all self contained, I don't see any power bricks. It's a plug and play assembly.


Tilt, I'll have to check that out. I've changed out the cabinet PS, MMII board, and sound amp board, but the noise is still there.
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Re: Game King with 3902 board has speaker static
« Reply #8 on: February 18, 2018, 11:48:23 AM »
Tilt,


I pulled the MPU Tray out to inspect U59. It looks good, but I did see a resistor soldered to the board that is not factory. SEE PIC.. Do you have any idea what someone was trying to fix? Could it be causing my noise, or was someone hoping to fix it with this resistor? Can I test U59 with my ESR Meter?


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Re: Game King with 3902 board has speaker static
« Reply #9 on: February 18, 2018, 02:38:05 PM »
.... Can I test U59 with my ESR Meter?...

Do you maybe mean U50??
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Re: Game King with 3902 board has speaker static
« Reply #10 on: February 18, 2018, 03:14:29 PM »
That resistor in normal in Rev A 3902 boards.  It was integrated into the PCB on Rev B boards. 

Sure you can check it with an ESR meter if you have one.  It's a 16V 4.7uF Tantalum Cap.  C59 is on the input side of the audio voltage regulator (U50), and C69 is on the output side of it.  Might as well check it too while you're at it.

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Re: Game King with 3902 board has speaker static
« Reply #11 on: February 18, 2018, 03:16:52 PM »
.... Can I test U59 with my ESR Meter?...

Do you maybe mean U50??


My mistake C59... Tilt say C59 could be my possible problem. It's in the picture right next to the plug for the MMII Board.
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Re: Game King with 3902 board has speaker static
« Reply #12 on: February 18, 2018, 03:37:33 PM »
Both C59 and C69 check good with my ESR Meter. Could my noise just be caused by the REV A boards?
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Re: Game King with 3902 board has speaker static
« Reply #13 on: February 18, 2018, 03:59:04 PM »
I don't believe so.  I've never noticed any difference between the two in the audio.  Have you tried a different MPU board?

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Re: Game King with 3902 board has speaker static
« Reply #14 on: February 18, 2018, 04:24:40 PM »
I don't believe so.  I've never noticed any difference between the two in the audio.  Have you tried a different MPU board?
No I have not.. I'm not sure if I have another one to test with.
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Re: Game King with 3902 board has speaker static
« Reply #15 on: February 18, 2018, 04:49:13 PM »
Ok.  I think you've pretty much eliminated everything else, so if you find one you may want to give it a try.

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Re: Game King with 3902 board has speaker static
« Reply #16 on: February 18, 2018, 04:57:03 PM »
Pretty much.. Swapped Amp Board, MMII Board, cabinet Power supply. Maybe I'm just being too picky, but it's working great with the exception for the static noise in the background in the speakers.
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Re: Game King with 3902 board has speaker static
« Reply #17 on: February 18, 2018, 05:35:45 PM »
Gary, can you post up a video?  We might be able to detmerine if it’s normal static or something out of the ordinary.


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Re: Game King with 3902 board has speaker static
« Reply #18 on: February 18, 2018, 07:48:44 PM »
Jason,
It's not very loud, but this is the 4th one of these I've built out in the past few months, and the only one that's  loud enough that's annoying. It's loudest when the screen is blank of cards when the games shuffling. I'll have to see if I can capture the noise on a cell phone video.


Gary
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