[Coco] My CoCo 3 freezes when you tap on it.

[Juan Castro]

You still have video when it freezes. Sometimes you have a random
character or two onscreen and some very slight "snow," others it's
just a "clean" freeze,

Looks like a bad solder somewhere, but how do I look for it?

Maybe the 512K expansion is the culprit? Will it function if I plug in
4 of the DRAMs on the motherboard sockets, without C65 and C66? If
not,what are these capacitors' values?

Some of the DRAMs are marked 8802, and others 8806. Is there a
difference? I only noticed that after I took them off.

http://picasaweb.google.com/lh/photo/W7BYfNHtVvnsXF_obIqN1W9XcHdiH80reA6_ygAbi6M

Juan