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Title: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 04, 2014, 09:52:50 pm A Got a mild hum coming from the power supply in my donkey kong cab.
any thoughts? Title: Re: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 06, 2014, 06:21:46 pm ok ill answere myself
I found another 5 bux worth of quarters under the power supply.. I took it out and checked all the grounds, changed the chord, pulled the sound board checked all the SOTTER connections. uh... checked my wires.. still got a slight hum. go figure. will recapping the sound board and vid board on the left (the two on the side of monitor) help? or could it still be the power supply.. also theres what looks like a tiny isolation transformer between those two small boards does that go bad? Title: Re: a hum comming from power supply donkey kong stock Post by: arcadefan1985 on March 06, 2014, 09:40:33 pm I was waiting for someone to answer this. I rebuilt my DK and it has a slight quivering hum to it and always has had. What does yours sound like?
I just turned the volume down a little. When I have all the games on I can't hear it. Title: Re: a hum comming from power supply donkey kong stock Post by: Anunaki on March 07, 2014, 04:53:25 am I had a humm in mine that is gone since I recapped the Sanyo (incl soundboard)
don't think it came from the PSU though Title: Re: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 07, 2014, 05:28:28 am I had a humm in mine that is gone since I recapped the Sanyo (incl soundboard) don't think it came from the PSU though recapped the monitor, I have the 2 pcb board dk.. it has those two side cards next to the monitor I did not recap those yet. the hum does come through the speakers Title: Re: Post by: Anunaki on March 07, 2014, 07:04:44 am I did the complete kit incl transistors on th soundboard
Vanaf mijn mobiel verstuurd Title: Re: a hum comming from power supply donkey kong stock Post by: John's Arcade on March 07, 2014, 09:33:07 am I was waiting for someone to answer this. I rebuilt my DK and it has a slight quivering hum to it and always has had. What does yours sound like? I just turned the volume down a little. When I have all the games on I can't hear it. The audio amp is to the left of the monitor and where the speakers plug-in. You should replace the caps on that sound booard. Title: Re: a hum comming from power supply donkey kong stock Post by: iankellogg on March 07, 2014, 10:24:15 am if you buy twisted quaters rebuild kid it has new amps as well as the caps for audio
Title: Re: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 07, 2014, 12:38:22 pm I was waiting for someone to answer this. I rebuilt my DK and it has a slight quivering hum to it and always has had. What does yours sound like? I just turned the volume down a little. When I have all the games on I can't hear it. The audio amp is to the left of the monitor and where the speakers plug-in. You should replace the caps on that sound booard. http://i1203.photobucket.com/albums/bb392/turbografx/1932428_785271034834682_1390197116_n-1.jpg Im on it. Title: Re: a hum comming from power supply donkey kong stock Post by: John's Arcade on March 07, 2014, 12:45:11 pm I should mention that there is no guarantee that this will fix it. But, it's where you should start.
I have read a lot about DK games humming. Title: Re: a hum comming from power supply donkey kong stock Post by: arcadefan1985 on March 07, 2014, 01:01:18 pm I was waiting for someone to answer this. I rebuilt my DK and it has a slight quivering hum to it and always has had. What does yours sound like? I just turned the volume down a little. When I have all the games on I can't hear it. The audio amp is to the left of the monitor and where the speakers plug-in. You should replace the caps on that sound booard. Yea, I've rebuilt several ez20's and sound boards and my hum sounds like the bootup nintendo sound that is probably coming from the pcb set. Title: Re: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 07, 2014, 01:01:25 pm I should mention that there is no guarantee that this will fix it. But, it's where you should start. I have read a lot about DK games humming. I don't have my hopes too high but it would be nice. ive had nothing but luck with this machine so far. plus currently the quarter find count is at 188 bux. Even if the hum don't go away with these caps at least I know the caps were changed. Title: Re: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 07, 2014, 01:03:17 pm I was waiting for someone to answer this. I rebuilt my DK and it has a slight quivering hum to it and always has had. What does yours sound like? I just turned the volume down a little. When I have all the games on I can't hear it. The audio amp is to the left of the monitor and where the speakers plug-in. You should replace the caps on that sound booard. Yea, I've rebuilt several ez20's and sound boards and my hum sounds like the bootup nintendo sound that is probably coming from the pcb set. It actually improved when I put a new power chord and cleaned the power supply. Title: Re: a hum comming from power supply donkey kong stock Post by: STEVESPEEZE on March 07, 2014, 07:20:02 pm We can close this case.. no more hum
(http://i1203.photobucket.com/albums/bb392/turbografx/1932214_785391251489327_1321292695_n.jpg) (http://s1203.photobucket.com/user/turbografx/media/1932214_785391251489327_1321292695_n.jpg.html) |