"This one seems to be different."... Yes, it was as I looked back on it. I was pressed for time and tried to shorten my reply, but I guess it might have been a little 'out-of-character' for me. Sorry.
"I see nowhere that you mention about using the salt/enhanced mode switch for it's intended purpose as well as just to check ID's especially since you were having so much trouble."... I didn't mention it, I guess, because I had stated that I was trying to see if the CZ-3D's new extra ID slot and audio might help me, especially for finding older nickels and such. Perhaps I just presumed that others would know I was trying out the Enhanced mode.
I did, as you note, forget to add my results with the Salt mode. I naturally tried the Salt Mode with the CZ-3D and side-by-side with the CZ-5. I found the CZ-5 in Salt mode to have slightly less sensitivity, but otherwise provided similar ID and audio as in the normal function. But with the CZ-3D I owned, the Salt mode produced different results from the Enhanced mode ... HOWEVER, it NEVER gave me proper performance ... NOR did it work similar to the CZ-5 as was suggested that it would.
"You've also mentioned over the years that when you get a detector that doesn't seem to perform up to expectations, you usually try another (several) example(s) of the same model to see if there is any variation from the first "problematic" example."... I only owned the one, but I did compare it with one at a dealer's shop and their seemed to be similar. Since that time, the dealer quit handling Fishers. There are not a lot of Fisher users or dealers around these parts and I can only afford to buy/sell/trade within reason to check things out.
To me, the biggest 'problem' with a unit like the CZ-3D, or any of the CZ series, is that they rely way too much on the internal calibration to establish the parameters for each of the notch segments. Too much internal calibration and not enough external operator control, at least that's my opinion.
"And last but not least, I can't understand why you wouldn't have checked with the service dept. and did whatever necessary to confirm the particular unit in question was operating to spec (or not)."...It was brand new right out of the box. I used it afield enough to evaluate, and it functioned almost exactly like another brand new one out of the box a dealer had. At the time, that was enough for me.
"Please don't hear this as ragging you as that's not my intent at all. It just appears (given the info from your post) that you very well likely got a unit that wasn't operating properly and you assumed it was. BTW, my personal experience with the 3-D was significantly different than what you had."... I did feel that it wasn't operating up-to-spec. At leas , it wasn't operating nearly as well as the CZ-5, which is the model I had entertained getting at the time because I had enjoyed ample success with earlier CZ-5's.
No, I didn't assume it was operating properly. I knew that, from the half-dozen people I had been in touch with around the country and personal CZ experience, what I had was a detector that might have been rushed onto the marker by a company that needed to get something new and exciting out there. It's all part of business.
Of those I communicated with from various parts of the US and one in Europe, all had a fair amount of experience with the CZ-5. Only one said that the CZ-3D seemed to work as well as the CZ-5, or maybe slightly better on nickels. The other five people all complained about the same things I was experiencing.
As I understood it, two had sought to have their units serviced, and the returned units worked about like the did when sent back. Only one of those half-dozen people told me they figured they were satisfied enough to keep the 3D. The other five were either going to get another CZ-5, or get a competitor's models.
I got feeling like I was being too negative in that post and I often do not do that. Oh, I know I do on occasion because I state my honest opinions. In this case, I just got in a hurry and omitted some things I should have included.
By the way,, I have since heard from a couple of people who have had reasonably good success for the CZ-3D, and to them (and you) I say congratulations! It's always good to have a detector in your arsenal that works and provides the performance you would like to haver.
All the best to you,
Monte