One day it's fine and the next, nothing. The speaker has always had a low hum and still does (multimeter'd at 0.2V) so connections are good, as is the sound board fuse. All other connections are good. Pressing the test button on the sound board yields nothing. This particular sound board does not have a volume pot. No other issues.
Is there a way to check to see if the sound board is functional with a multimeter?
I have seen that the hum is frequently due to the short distance between the transformer and the connector of the sound board .
Make the Good piece of advice from Maldoror +
http://www.pinrepair.com/sys1/index.htm#sound
+ enlarge distance between connector and transformer
= just the sound for pleasure.
Totem at home = system1 at home ...
perhaps if you had a speaker laying around with the same ohm value or near it you could swap it out?
Also try reseating the eprom on the sound board (and any other socketed chips). It's possible the socket has just gotten dirty and a pin is no longer making a connection. Sockets are notorious for intermittent trouble but a necessary evil. I prefer using the gold plated Augat sockets with the round holes when I replace them.
Cables and PROM re-seated. Capacitors checked (I think--I'm not an electronics whiz) and I may have a bad one. The fellow I recently bought the Genie from is sending me the sound board from his System 1 Incredible Hulk to try out.
As far as the hum is concerned, I figure it's likely due to the speaker's proximity to the transformers and lackluster shielding. I'm not worrying about it. I just want to get my Genie sounding proper again! It's not nearly as fun playing in "silent mode."
I wish this forum would notify me when people reply to my posts! Oy vey...
It's karma .. the sound just went out today in my old Williams Phoenix. I'll let you know what I find. I'm on a mini-vacation for the holiday weekend so it's not a priority and I do have many other machines to play.
Problem is a dried up electrolytic capacitor. I'm taking it to work on tuesday and replacing all of them just because it's a good idea.
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Portland, OR
Larodde