Thanks everyone... I think you've got me on the right path.
Don...The battery idea seems like a very plausable one to me. I'll open it up to see if I can find the battery. At this point though I'm not sure I want to spend the $400 for a repair, my wife is already upset with me for buying my photography equipment in the first place. (Don't tell her I bought a broken kodak model 1) ;-)
Bob... Great idea. I did the search and downloaded the manual. I too found no mention of my particular error message. Thanks for the proper wording for the search. I sometimes either constrain my searches too much or not enough and am usually not satisfied with the results.
Greg... I will give Sam a call. Reason being that maybe he can help me with my other 2 broken densitometers. That's right folks, I'm not having much luck buying these things. The first I bought knowing of its condition thinking I could fix it. The second I bought for parts to fix the first one. I gave up on that plan and decided to buy a working one, only to have it arrive and find it not working. Oh well, I must have bad densitometer karma or something. Or maybe someone's telling me to forget all this technical stuff and just go out and shoot pictures!
Thanks again everyone, I'll try to keep you all posted.
Howard