Recently picked up a decent Bally Atlantis. The only thing noticeably wrong is the sound. Most of the time the music does not work, sometimes cuts in and out and goes really loud. Call outs are there but no other sounds. It had the original battery with a tiny bit of corrosion on the ends so I removed it. Next to it
I’m noticing on the main board there’s a resistor that appears burnt out. I’m going to order replacement resistor, battery holder and an led kit. I just re flowed solder on all the points on the fuse board. I’m hoping the resistor is what’s causing the weird sound issues. Any insight would be appreciated

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I have discovered it is a 80 ohm 1 watt 10% resistor. Having a hard time finding a replacement. Anyone have any ideas ?

Thanks everyone for the responses.
I ordered a resistor pack from Marcos assuming the right rating resistor would be there but it’s not. But assuming it’s used to charge the nicad does it even matter if it’s bad?
After putting the board back in and powering up some of the coils are not working. In the coil test some of them or working but some aren’t. Flippers do not work, drop targets do not go up and down nor does the lift ramp.
The sound is staying at a steady volume and not distorted or going super loud anymore but still no music. I can start a game but it’s acting like a switch is locked on or something and keeps registering points and saying shoot for million(repeating)

At boot getting D1-4 (drop target) errors
Sometimes making a loud screatching sound when flashing error codes

Checking the voltages on the power board
+14VDC is at about 15.7
+5v is at 5.08
A11VAC is at 8.7
B11vac is at 9.8
230 vdc is at 209

Kinda stuck at the moment any ideas?

slochar im not sure how to check the voltages on the ic, which pins should I check?

Update. Music was just turned off in the settings. Sound worked okay for a few minutes then got loud and distorted and stuck that way . I’m just trying to figure out where there’s no power on both flipper coils, main ejects drop targets aren’t working either is uo kicker in the back of play field. Thanks

Update. One of the connectors wasn’t plugged in, causing the flippers and coils to not work. This is no longer a problem.

Music was out but now seems to be working along with sound effects but everything is loud and distorted

Removed the sound board and found this. Seems like someone tried to repair it in the past. Not really sure how to troubleshoot this one..

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slochar ive got everything in the game running, sounds and music is there but distorted. Do you think changing the LT1054 will fix this? I was looking at mouser and they have a bunch but there’s many different versions, I’m not sure which one I would need

slochar I’m getting a good reading at -12.v on the 1054 IC . Really scratching my head now.

Update. I noticed in the manual it states about distorted sound to also check the AC ripple on the 100uf caps so I’m going to do that next or just replace them anyway

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slochar
Reaplaced caps and same issue. Moving on to replacing the IC
There seems to be many different kinds of the 1054
Will any be okay as long as it’s a 1054 CN8? Do the numbers above 1054 mean anything ?
Thanks

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Replaced all caps on both sound boards and still having the same issue. Sound is loud when turned all the sound way down and distorted. I’m thinking possible bad ram could be the only other thing I could try to fix. Possibly a bad resistor on the volume pot?