My fairly newly acquired original MK2 machine worked great for a while but the test chime started dinging 10 times in a row. The sound worked great with no problems otherwise. I decided to check the chips on the soundboard so popped all 7 off carefully and wiped the connections down with rubbing alcohol and reinstalled them. Did this one at a time so I'm pretty sure none of them went in backwards. Now I have no sound at all (apart from the 10 chimes when I start up the machine.)
What might I have done and what should I check?
What might I have done and what should I check?

