Tesoro board information

[Mark-VA]

Since Tesoro is no longer in business can a person get information about a specific detector? I have a friend in Louisiana that has 2 golden Micro max detectors. He didn't like the tone setting on one of the machines so he decided to adjust the pots, don't know which one or if more than one pot was adjusted. He was trying to adjust so both the detectors were the same. Any information as to how these should be adjusted. Any help would be greatly appreciated.
Mark

[Carl-NC]

The tones on the Golden are created by the micro, you can't adjust them. If he messed up the trimpots then it matters which one(s). There are 4.

[Mark-VA]

Oops, I'll need to ask. Well what does the trim pots do?

[Carl-NC]

Two of them set offsets in the post-derivative amps; one is for ground balance cal; one if for disc cal.

[Mark-VA]

He doesn't remember which one he changed. But he saw the instructions on the internet several years ago and went by them without thinking it through. I think he should just forget it and count is as a lesson learned not to mess with something without knowing what they change.
Thanks for the quick answer.

[Mark-VA]

Two of them set offsets in the post-derivative amps; one is for ground balance cal; one if for disc cal.

Any way of figuring out how to adjust the machine back to specs?
What brought all this on was he had bought one of the 1st generation Golden's and the audio had in his words a "quack" sound when a nickel was detected. He really like that audio and wanted to make sure he had another one just like it. But the second one he bought was different. He sent it back to the Tesoro and they sent him a replacement but it was the same. Assuming a new design or something had been improved (my opinion) but all this lead him to adjust the new one to try and match the original one. He said he saw the instruction on YouTube but I can't find it myself.

[Carl-NC]

At some point Tesoro changed the tones on the Golden and made nickel give a higher tone, similar to silver. Again, all done in software, there is no way to change it.

If all he did was adjust the 2 blue trim pots then it might be fairly easy to fix. If he adjusted the 2 smaller trim pots then it will take an oscope and some head scratching. The 2 smaller trim pots must be correct before setting the blue trim pots.

Assuming they are, then trim pot R43 adjust the ground balance. Put it in all-metal mode, set a decent threshold, and bob a ferrite while adjusting R43 until it goes quiet.

R49 adjusts the disc setting. I'm not sure how the factory set this, but the way I would do it is to set the Mode to disc, set the Disc to preset, and set the Notch to narrow and minimize the width. Then wave a complete flattened pulltab and adjust R49 until it is rejected. This may take some figuring out.

[keith777]

Hi Mark.

is it the Tesoro golden umax that you are looking for. pictured bellow.

[Mark-VA]

Yes it is

[keith777]

i have these if they are of any help to you.