modessitt
Volunteer: Encyclopedia Submission Moderator
So - I brought a Q*Bert into the shop today with no sound. Rebuilt the burnt +30vdc circuit in the power supply, and now all my sounds are there, but I have a constant hum that doesn't change with the volume control. Got to this point at the end of the day, so I haven't done anything else yet.
Obviously, I will make sure it's not caused by the marquee light, but other than that, would I be looking at a bad 2200uF cap on the power board not filtering properly? Leaky caps on the sound board? A ground issue? Bad amplifier?
Still have to replace a burnt-up knocker, so any other help would be great. I know "Q*Bert" and "sound problems" are heard often, so figured I'd ask those who've messed with it a lot....
Obviously, I will make sure it's not caused by the marquee light, but other than that, would I be looking at a bad 2200uF cap on the power board not filtering properly? Leaky caps on the sound board? A ground issue? Bad amplifier?
Still have to replace a burnt-up knocker, so any other help would be great. I know "Q*Bert" and "sound problems" are heard often, so figured I'd ask those who've messed with it a lot....