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Need some serious help with MK2 sound

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Love5508:

Brand new direct replacement power supply came today.  I hooked it all up and made my voltages all set good BUT...NO WORKY! :banghead:  It still produces the weird buzzing but I notice as I adjust the voltage, the buzzing changes in frequency with the adjustments.  For example if I turn it down, the buzzing will get low pitched and "slower" and if I turn the voltage up, the damn buzzing get higher pitched and "faster".  I can hear the lope of the frequency shifting in tandem with the amount of voltage.  VERY ODD and has now confused the hell out of me.  All other games (UMK3 and MK4) are not affected in any way.  I am about to break the damn board...any one, please, any one? :cry:

MK3FAN:


--- Quote from: Love5508 on February 13, 2010, 03:31:29 am ---Brand new direct replacement power supply came today.  I hooked it all up and made my voltages all set good BUT...NO WORKY! :banghead:  It still produces the weird buzzing but I notice as I adjust the voltage, the buzzing changes in frequency with the adjustments.  For example if I turn it down, the buzzing will get low pitched and "slower" and if I turn the voltage up, the damn buzzing get higher pitched and "faster".  I can hear the lope of the frequency shifting in tandem with the amount of voltage.  VERY ODD and has now confused the hell out of me.  All other games (UMK3 and MK4) are not affected in any way.  I am about to break the damn board...any one, please, any one? :cry:

--- End quote ---

Make sure your ribbon cable is hooked up correctly. Sometimes weird things happen it it gets turned around at one end or the other.

Love5508:

Ribbon cables are set in correctly.  I dont know, may just be a bad board.

MKFan4Life:

I have a dedicated MK2 cab and it has always exhibited this phenomenon.  I have swapped other JAMMA boards into the cabinet and they don't do this.  WEIRD.  When playing the game at a reasonable or loud volume you don't really pay it much attention, but at lower volumes I hear it...like a hum or whine.  When my screen changes during attract mode, it makes a little squelching sound as the screen changes from like the winning streak display to the next screen.

I thought maybe that one large capacitor on the sound board might be bad (possibly filtering the power supply?), and changed it out with a new one of the same value, but there was no difference.  I also have another MK2 JAMMA board set I have tested to make sure it works properly, but I didn't think to see if it exhibits this "interference".  I don't think either my MK1 T-Unit set or MK1 knock-off JAMMA boards had this problem.

I will try, if I can, tomorrow, to hook the other board set for MK2 up in the MK2 dedicated cab and see if I notice it doing the same thing.  Would be nice to find out the cause once and for all, lol!



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