Hello,

I have a Williams system 3 sound board that isn't working. I replaced all the chip sockets but only get a hum. I think my speaker is good because I do hear a hum when I turn up and volume. I'm not really sure what to do next?

I replaced all the capacitors on the board. I replaced all the original chip sockets on the sound board. Its for a Aristocrat shuffle alley. I had a Disco Fever and the sound board looks exactly alike. I'm wondering what to check next? Anyone repair these boards?

I pressed the test button switch and have no sound.

1 fuse

I think the mods were done because there were jumper wires on the back of the board. I read on the post that IC9 and IC8 are suspect. I'm not sure how to test them?

IMG_20150906_222528.jpg

IMG_20150906_222538.jpg

IMG_20150906_222546.jpg

I was getting 5.24 vdc, 12.05vdc and -11.50vdc. When I play the game I can hear sounds try to activate, as in the hum gets higher for a moment. Maybe I should replace IC8 and IC9 because I was reading in the other post they were problematic.

I don't know how to tell if its a prom or not. The numbers on the chip are 6341-1J, 7830, SE 1203. Here are a few pictures of the back of the board, it does have jumper wires but I don't think that the resistors and pins 39 and 40 of IC3 were modified.

IMG_20150907_115357.jpg

IMG_20150907_115420.jpg

IMG_20150907_115351.jpg

IMG_20150907_115433.jpg

Who can make me a sound EPROM?

I have decided to switch the jumpers and install a EPROM in place of the PROM.

So If I get a new EPROM all I would have to to to my board is change the jumper wires, and tie pins 39 and 40 together?

I just did all the resistors mods and tied 39 and 40 together.