Ty,
I have not doubt the detector can be repaired easily. Now, I have a couple of questions like if you turned the sensitivity down, did the snap crackle and pop quit? If so, at what setting was the detector stable?
Next, since you had a couple of other similar detectors, did you swap coils? If so, did anything change?
I mention these two issues because they can vary between detectors. Take one detector and if the parts make the detector a little more sensitive at the same time that the coil on the detector isn't shielded quite as well as a different coil, then the combination can cause the symptoms you mentioned and everything still be within spec.
The key to any repair is when a detector is sent in, the owner should try to provide as much information as possible, if for no other reason than as a courtesy to the tech who will try to repair it.
If the tech runs through basic tests and the detector passes, all he knows is the detector works within spec. What he doesn't know is just what might be causing the problem you are experiencing, because the problem doesn't exist under the conditions he tried it. However, if you would have told him that two other units were quiet at the same location, it might have helped the tech figure out what might be wrong, or at least helped the tech ask a few more questions.
So, for anyone sending a detector in, please provide as much information as possible. This is the best way to get your detector fixed correctly.
Let me mention this, I have three Bandido's I keep around to let other people use. All three are a little different from each other and one of them is noisier than the other two. I can tweak the sensitivity control just a little and the noise stops. Do I worry about this condition? Of course not because I know there are factors that could cause the problem. Also, if I turn down the sensitivity enough to make the detector quiet, I know that detector still goes as deep as my other two. It was just a little more sensitive to begin with, which is what I found when I ran full tests on them.
So, please don't expect the tech find something thinking that he should know, because all too often people will send a detector in not because it is defective, but because the operator simply didn't know how to adjust it or know that some detectors may be just a little more sensitive than others.
Now, to add a little humor to this post, I will relate something told to me by George Payne many years ago. George and Roy Van Epps had gone to a treasure hunt in Oklahoma and while there they had a woman approach them with a complaint about her new detector. She claimed the detector didn't work as it should.
So, George asked her to please show him what it was doing wrong and tossed a coin on the ground. The woman passed the coil over the coin and the detector sounded off just fine. Then the woman raised the coil and stuck it in George's face and said "see". Well, needless to say, George was stumped and again asked the woman why she thought the detector wasn't working. So, the woman passed the coil over the coin again and then shoved the coil in George's face a second time and said "see". Again, George was puzzled and asked the woman just specifically what she thought the detector was doing wrong.
The woman snapped back, "see, the coil didn't pick up the coin". It seems that the add said the detector would pick up coins at great depths and it wouldn't even pick up one on the surface. Sad but true, the woman actually expected the coil to physically pick up the coin.
Reg