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Author Topic: Meteor sound hum  (Read 536 times)

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Offline ralph67

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Meteor sound hum
« on: March 15, 2012, 04:01:25 AM »
Background hum quite loud and it starts after the second beep(flash).cpu ,sound board are good.They have been tested in another game. Speaker and line filter good aswell. Anybody with some ideas to try next? !@#
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Offline Strangeways

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Re: Meteor sound hum
« Reply #1 on: March 15, 2012, 10:03:03 AM »

Speaker grounded ?

Do you have a spare SB-300 sound board ? Could be one of the caps on the board, and swapping the board with a spare might isolate the issue.
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Offline Retropin

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Re: Meteor sound hum
« Reply #2 on: March 15, 2012, 10:08:29 AM »
Yes... possible faulty noise/ripple cap on the board... also make sure you have solid grounding. I always solder extra ground from the board ground and screw to the true ground on the machine...ie earth braid etc
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Offline ralph67

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Re: Meteor sound hum
« Reply #3 on: March 15, 2012, 07:33:20 PM »
Quote from: Retropin on March 15, 2012, 10:08:29 AM
Yes... possible faulty noise/ripple cap on the board... also make sure you have solid grounding. I always solder extra ground from the board ground and screw to the true ground on the machine...ie earth braid etc
Will check those. The machine is a friends and is not with me but i will contact him to try these things.
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Offline ralph67

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Re: Meteor sound hum
« Reply #4 on: March 15, 2012, 07:46:40 PM »
Quote from: Strangeways on March 15, 2012, 10:03:03 AM

Speaker grounded ?

Do you have a spare SB-300 sound board ? Could be one of the caps on the board, and swapping the board with a spare might isolate the issue.
Will check the grounding. Two working SB-300's were tested in game,both good but still the hum was there. Also these boards test good in a Quicksilver and no hum . Think it may be a Grounding issue i'll get him to check and i will be trying a Altek board on game.So i'll post on the outcome
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Offline ajlaird

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Re: Meteor sound hum
« Reply #5 on: March 16, 2012, 12:43:22 AM »
What about dodgy cap in power supply? Could that cause enough ripple to give a hum?
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Offline ralph67

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Re: Meteor sound hum
« Reply #6 on: March 17, 2012, 03:09:41 PM »
Fixed. Broken SB cable .One pin, Looks like the factory were rough #(& when putting the cable together and cracked the plastic connector housing and it finally let go after many hours of shaking. Thanks for the tips ^^^
« Last Edit: March 17, 2012, 03:12:27 PM by ralph67 »
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Offline goodolddays

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Re: Meteor sound hum
« Reply #7 on: March 17, 2012, 03:17:37 PM »
Good work  ^^^
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Offline pinwaz

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Re: Meteor sound hum
« Reply #8 on: March 17, 2012, 03:34:37 PM »
Thanks for your help ralph,enjoyed playing the meteor with taylah and pop lastnight,pop's puts some coolas leds in aswell $#$
Quote from: ralph67 on March 17, 2012, 03:09:41 PM
Fixed. Broken SB cable .One pin, Looks like the factory were rough #(& when putting the cable together and cracked the plastic connector housing and it finally let go after many hours of shaking. Thanks for the tips ^^^
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Offline ralph67

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Re: Meteor sound hum
« Reply #9 on: March 18, 2012, 12:42:09 AM »
Quote from: pinwaz on March 17, 2012, 03:34:37 PM
Thanks for your help ralph,enjoyed playing the meteor with taylah and pop lastnight,pop's puts some coolas leds in aswell $#$
Quote from: ralph67 on March 17, 2012, 03:09:41 PM
Fixed. Broken SB cable .One pin, Looks like the factory were rough #(& when putting the cable together and cracked the plastic connector housing and it finally let go after many hours of shaking. Thanks for the tips ^^^
Good one. Ted sounded very happy about it. I'll be up to have a game during the week. can't wait!
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Offline jojob

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Re: Meteor sound hum
« Reply #10 on: March 30, 2012, 10:40:38 PM »
a bad ground can give a hum?? !@#
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