Author Topic: Data East loud buzzing noise through speakers  (Read 211 times)

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Offline Snoz

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Data East loud buzzing noise through speakers
« on: August 19, 2015, 10:39:06 PM »
Hi,

I was going to ask for help here with my TMNT machine having very loud buzzing noise coming from the speakers which increased when I install a Rottendog PSU card to an unbearable level and it was at the noisiest level during the attract demo.

You probably already know this but I was so happy, proud and to surprised to be honest of myself of fixing it, I thought I'd post here of my findings.

During my searching I read that Data East noise is a common problem, a lot of suggestions was to check and replace capacitors on various boards, which is out of my league and they all looked in good condition to my untrained eye. I also read that bad earth to the cards can also cause this, so this was something I was capable of doing and followed the suggestion and I tightened all the screws on my sound board, saw that one was missing but I found the screw was stuck on the magnet of the back of the speaker (lucky find) so I reinstalled that too. I turned on the machine and the noise was still present.

I read on that people had success with unscrewing the sound board and free floating it, so I tried that and it was still the same noise level and reinstalled it to the back board.

I thought I stuck with this noise problem and just as I was closing the back board up I noticed the CPU board also had a screw missing so I looked around and found a screw and whacked it in and checked all the rest of the screws to make sure no more was going to fall out. After a few hours I thought I'd have a quick game so i turned on the old girl and I was amazed that I only had a very very slight buzz synced with the lights flashing. I was amazed that a one mounting screw missing could cause such problem.

Cheers

Andrew.

Offline Strangeways

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Re: Data East loud buzzing noise through speakers
« Reply #1 on: August 20, 2015, 08:51:53 AM »
Good story - and very common issue on DE games. Easy fix !

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Offline pinnies4me

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Re: Data East loud buzzing noise through speakers
« Reply #2 on: August 20, 2015, 09:24:33 AM »
Thanks for sharing, would never have thought of that!
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