My vero Tesor uMaxII

[mykaitch]

Always had a problem with GB. Embarrassment

Found I had wired AUTO switch back to front so AUTO was MAN,MAN was AUTO.
Also explained RETUNE operation.

The better news.NOW I can detect a quarter at 12". Great range,
and all functions work as they should.

[Koala]

Which model is yours based on ?

Taken from the manual

Retuning the threshold Hold the quarter still about 2 to 4 inches from the searchcoil, in line with the searchcoil center. Listen to the target response sound for 1 or 2 seconds. Do not move the quarter!

• Flip the MODE switch to RETUNE and release it.

Notice that the target response sound will decrease to the regular level of the threshold sound. Now, slowly move the quarter from side to side, going past the edge of the searchcoil. Notice the regular threshold sound is gone and the target response sound is now a “beep” that occurs when the target passes in front of the searchcoil center. This technique is used to “pinpoint” the exact location of a object.
Take the quarter away from the searchcoil.

• Flip the MODE switch to RETUNE and release it.

Notice the regular threshold sound returns. Move the quarter close to the searchcoil and notice the loud continuous target response sound has returned. Take the quarter away again.

• Flip the TUNE switch to AUTO.

Hold the quarter still near the searchcoil for a few seconds and notice the detector automatically retunes itself. Then, try moving the coin from side to side and notice the target response sound is a “beep.” Take the quarter away from the searchcoil for a few seconds and try it again. Now, try this test with the different coins using both tuning methods and listen for the differences in the sounds.
Functions Demonstrated: 1) How the All Metal Mode target response sound will vary depending on various factors such as what type of metal targets are buried in the ground, how deep they are, how fast you move your searchcoil and so on. 2) How the detector’s threshold can be retuned manually in Normal Tune or automatically in Auto Tune and how this affects the target response sound

[mykaitch]

Yeah I have the manual for mine UMax II. Until I found my cock up it would not GB like the manual said. It does now.