Bad Asteroids HUM

Braido

Well-known member

Donor 2011
Joined
Jul 17, 2009
Messages
4,811
Reaction score
82
Location
California
Anyone have this problem before? I changed out the Big Blue from one i got from Bob Roberts but that didn't help. I think it maybe some other bad caps on the power supply? Or caps on the Sound Board. Anyone know where to start?

Thanks,
Shayne...
 
I've been trying to fix mine. Here are the things that I know to try:

1) disconnect the marquee light, ballast, etc.
2) bad volume pot (bypass the pot and connect a speaker directly to the AR board to test.
3) change big blue
4) make sure everything is properly grounded
5) swap your board into a machine that doesn't hum and see if it hums. I just did this with my Asteroids Deluxe board into an Asteroids and found that is the problem. Going to try a cap kit from Bob Roberts to see if that fixes the board.
 
I changed out the Big Blue and that was a big help with my wobbly monitor but the hum is still there also checked the grounds. Will trouble shoot the rest of the items you mention. Thx for the help.
 
Mine was humming really badly, then I read somewhere to jumper a wire between GND on the A/R and the main PCB, and that really helped. Then I noticed that someone had rewired the speaker off the A/R and had it across Speaker 1 and GND rather than across Speaker 1 and Speaker 2. Fixing that got rid of just about all the hum.

DogP
 
Mine was humming really badly, then I read somewhere to jumper a wire between GND on the A/R and the main PCB, and that really helped. Then I noticed that someone had rewired the speaker off the A/R and had it across Speaker 1 and GND rather than across Speaker 1 and Speaker 2. Fixing that got rid of just about all the hum.

DogP

I'll have to try the ground jumper. I recapped the main PCB and it still hums.
 
Then I noticed that someone had rewired the speaker off the A/R and had it across Speaker 1 and GND rather than across Speaker 1 and Speaker 2. Fixing that got rid of just about all the hum.

DogP

I just checked my Asteroids Deluxe, which had bad hum, and the speaker was wired the same way from the AR board (pins 1 & 3). Changed it to pins 3 & 4 (spk 1 & 2) and the hum nearly disappeared. The game was also a lot louder so I had to turn the volume down. Thanks for the tip! I have a nice quiet arcade now.
 
Last edited:
I just checked my Asteroids Deluxe, which had bad hum, and the speaker was wired the same way from the AR board (pins 1 & 3). Changed it to pins 3 & 4 (spk 1 & 2) and the hum nearly disappeared. The game was also a lot louder so I had to turn the volume down. Thanks for the tip! I have a nice quiet arcade now.

Wow... that's odd. Mine was clearly hacked (wires cut and soldered directly to the A/R), so I figured it was the work of a lone idiot ;) . Until I looked at another cab, I assumed that was right, and I figured that the A/R was just designed for stereo or something.

DogP
 
Back
Top Bottom