I have a DCS sound board that I'm trying to trace down the problem on. On boot up I get two bongs and in the error report it say sound board interface error. I have all new EPROMs in U2-U9. Got the images off IPDB. I'm using 2704 chips at 150ms the manual calls for 120ms but I don't think the faster chips are an issue? All sockets look good no corrosion. I verified continuity for all sockets. I also replaced the RAM chips to eliminate them as suspects. All this and still no change.
Can someone suggest were to go from here?