(Topic ID: 123111)

eight ball deluxe le humming


By maestro

5 years ago



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  • 17 posts
  • 8 Pinsiders participating
  • Latest reply 5 years ago by maestro
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#1 5 years ago

I recently bought an EBDLE. It has a loud humming coming through the speakers (see video below). I am not sure what it is and am looking for suggestions fr troubleshooting or repair. I have 5 other pinball machines in the same room running on the same sockets and they are all quiet. So far I have tried removing the fluorescent back glass bulb and unplugged the lighting ballast from the system. That made no change. I unplugged the headers from the mpu board and heard no change. The loudness of the hum increases and decreases with the main volume knob. I put in a new volume pot and no change. Anyone else ever had this n one of these old Bally's? Otherwise all sounds and voices work properly.

#2 5 years ago

check the pots on the sound board

might need replacing

#3 5 years ago

Disconnect the board from the ground plane (remove the screws) and see if it goes away.

#4 5 years ago

Time to recap the sound board.

#5 5 years ago

I forgot to mention I did float the sound board from the mounts. Hum did not disappear. Pots on the sound board sound clean when I adjust them. I turn them both all the way down and can still hear some hum. KenLayton, when you say recap the soundboard, which caps do you replace? There are tons of caps all over the board. If I need to do them all is there a kit to make ordering easy somewhere or do I have to get them individually.

20150331_130116.jpg
#6 5 years ago

Just the electrolytic caps...the ones marked with "+" and/or "-". Note they must be installed with + or - pointing the right way.

Great Plains Electronics sells kits.

#9 5 years ago

The axial leaded electrolytic capacitors are what get replaced.

#10 5 years ago

Question: Did the humming start shortly after I scored 2.4 million on it last week?
(A gentle jab, my friend.) Let me know if you need to borrow my soldering equipment.

#11 5 years ago

Ouch! Nah, it was there when i got it. Has gotten louder. Also we had six machines going and people in and out so it was probably hard to hear. I will probably take you up on the offer. I ordered the kit for the squalk and talk board as well as kits for all the other boards. I figure i may as well do them all since they are all the same age.

I'll post back if this fixes my issue or not.

#12 5 years ago

Also try subbing in a different speaker to eliminate that.

#13 5 years ago

I would try eliminating the volume pot inside the coin door as well.

#14 5 years ago

Good idea on the speaker. I will try that. I did swap the volume pot on the coin door for a new one. No difference.

#15 5 years ago

Recapped the squawk and talk board. That fixed the humming. Now running silent as it should. However a new issue has occurred. As of now I am hearing sound effects but no voice. I've double checked my connections, my recapping placement and my solder joints. I'll start a new thread. Thanks for all the advice.

#16 5 years ago

Replace the small trimpots on the sound board. One is for speech and the other is for sound effects.

#17 5 years ago

I didn't replace those because they weren't sounding scratchy when I adjusted them. I did put them in my order so I have them. Good thing because I went back and fiddled with those and my voice came back. I will be replacing those tomorrow. All is well with sound now. Thanks.

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